Document:

<PAGE>   1
                                                                    EXHIBIT 10.1

                           NETWORK SERVICES AGREEMENT

         This is a NETWORK SERVICES AGREEMENT ("Agreement"), dated and effective
this 12th day of May, 2000, by and between:

         HIGH SPEED ACCESS CORP.
         4100 E. MISSISSIPPI AVE., SUITE 1150
         DENVER, COLORADO 80246                       ("HSA")

                  and

         CHARTER COMMUNICATIONS, INC.
         12444 POWERSCOURT DR., SUITE 400
         ST. LOUIS, MO  63131                         ("CHARTER")

                                    RECITALS

         A. Charter owns and operates the radio frequency ("RF") cable
television franchises and related hybrid fiber-coaxial landline distribution
systems ("Cable Systems" or "Systems"), and provides Internet access and related
services to certain cable subscribers (the "Charter Pipeline" service).

         B. HSA provides high-speed "data over cable" connectivity and related
services to its customers through various sources, including, without
limitation, cable television plants and systems.

         C. Charter wishes to retain HSA to provide to Charter certain
residential Tier 2 and above technical support and NOC support in Charter's
Systems in connection with Charter's deployment of Charter Pipeline upon the
terms and conditions of this Agreement.

         NOW, THEREFORE, in consideration of the premises and mutual covenants
and agreements set forth herein and for other good and valuable consideration,
the mutuality, receipt and sufficiency of which are hereby acknowledged, and
intending to be legally bound hereby, the parties hereto agree:

         1. DEFINITIONS.

         1.1 "Additional Committed Network Systems" means Committed Network
Systems that Charter adds to EXHIBIT 3 pursuant to Section 2.4 hereof after the
date of this Agreement and during the Term of this Agreement.

         1.2 "Applicable Law" means, with respect to any individual,
partnership, limited liability company, corporation, trust, joint venture or
other entity ("Person"), any statute, law, rule, regulation, directive, treaty,
judgment, order, decree or injunction of any federal, state or local authority
that is applicable to or binding upon such Person or to which such Person is
subject.

<PAGE>   2

         1.3 "Cable Subscriber" means a cable TV subscriber or potential cable
TV subscriber residing in a "home passed" (i.e., residence or commercial
establishment) with access to a Committed Network System.

         1.4 "Charter" means Charter Communications, Inc., a Delaware
corporation, and its affiliates and direct and indirect subsidiaries, and any
successor company as may result from any merger or other business combination or
reorganization of Charter Communications, Inc..

         1.5 "Charter Pipeline" means the Charter- branded Charter Pipeline
on-line Internet access service offered by Charter to Data Subscribers for
display on personal computers. Charter Pipeline shall not include IP telephony
service, or any other services.

         1.6 "Charter Single Point of Contact" or "CSPOC" means Steven Silva,
Senior Vice President of Corporate Development and Technology for Charter, or
Jeff Jay, Director of New Product Development for Charter, or their respective
nominees whose identities have been provided to HSA.

         1.7 "Committed Network Systems" means those Systems in which Charter is
deploying and/or operating Charter Pipeline and has engaged HSA or will engage
HSA to perform the HSA Network Services on behalf of Charter under this
Agreement, and are listed on EXHIBIT 3 attached hereto or are added to EXHIBIT 3
as Additional Committed Network Systems.

         1.8 "Confidential Information" means any and all information emanating
from either HSA's business or Charter's business in any form, including the
terms and conditions of this Agreement, as well as all data, summaries, reports
or information of all kinds, whether oral or written, acquired, devised or
developed in any manner by either party, including without limitation, the
Customer Lists and Charter's billing system data. The term "Confidential
Information" shall not include information that is in the public domain;
information known to the recipient party as of the date of this Agreement as
indicated by the recipient's written records, unless the recipient party agreed
to keep such information in confidence at the time of its receipt; and
information properly obtained hereafter from a source who is not under an
obligation of confidentiality with respect to such information; information
independently developed by the receiving party through persons who have not had,
either directly or indirectly, access or knowledge of such Confidential
Information that can be verified by independent evidence; or information
obligated to be disclosed under law or produced under a court order of competent
jurisdiction or valid administrative or congressional subpoena.

         1.9 "Customer Lists" means the lists of Cable Subscribers and related
subscriber and billing system information (i.e., name, address, phone number,
other demographics, cable TV service level selection, etc.).

         1.10 "Data Subscriber" or "Active Data Subscriber" or "Charter PC Data
Subscriber" means a residential, personal computer-based data Cable Subscriber
who has subscribed and is provisioned to use Charter Pipeline as of the last day
of any calendar month during the Term, regardless of whether they subscribe to
cable TV service.

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         1.11 "First Network Services Agreement" means the Network Services
Agreement, dated November 25, 1998, by and between HSA and Charter
Communications Holding Company, LLC, an affiliate of Charter.

         1.12 "HSA Network Services" means the residential Tier 2 and above
technical support and NOC support services attributed to HSA in EXHIBIT 1
attached hereto and, if applicable, the deployment services attributed to HSA in
EXHIBIT 2 attached hereto.

         1.13 "HSA Single Point of Contact" or "HSPOC" means Tammy Smith, Vice
President of Affiliate Relations - Charter.

         1.14 "Launch Date" means the date on which Charter commences billing
for Charter Pipeline in a Committed Network System.

         1.15 "Registration Rights Agreement" means the Registration Rights
Agreement, dated the date hereof, by and between HSA, Charter and Charter
Communications Holding Company, LLC, an affiliate of Charter.

         1.16 "Specifications and Standards" means, collectively, the technical
specifications and standards to which Charter's cable plant/head-ends must
adhere in order for Charter Pipeline to be distributed and the facilities to
function.

         1.17 "Warrant" means, as the context requires, the Amended Warrant
and/or any Renewal Warrant, or the number of Warrant Shares issued or issuable
under the Amended Warrant and/or any Renewal Warrant.

         1.18 Other Definitions. The following terms are defined in context in
the paragraphs or Sections indicated:

<TABLE>
<CAPTION>
          Capitalized Term                             Where defined
          ----------------                             -------------
<S>                                               <C>
"Additional Committed Network System Notice"      Section 2.4
"Amended Warrant"                                 Section 6.1
"Attainment Measures"                             Section 2.2.1 of EXHIBIT 2
"ATP" or "Authorization to Proceed"               Section 2.5
"Capacity Thresholds"                             Section M.1 of EXHIBIT 1
"Change"                                          Section 7.2
"Charter Operational Elements"                    Section 3.1
"Charter Parties"                                 Section 11.1
"Charter Termination Event"                       Section 13.2
"Claims"                                          Section 11.1
"Conversion Requirements"                         Section 13.4
"CPI-adjusted"                                    Section 8.4
"CSR"                                             ATTACHMENT 1-A to EXHIBIT 1
"Deployment Estimate"                             Section 8.3.1
"Deployment Services"                             Section 2.1 of EXHIBIT 2
</TABLE>

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<TABLE>
<S>                                               <C>
"Deployment TTM Charges"                          Section 2.1 of EXHIBIT 2
"Expedite Fees"                                   Section N of EXHIBIT 1
"Force Majeure"                                   Section 16
"Head-End Record"                                 Section 2.2 of EXHIBIT 2
"HSA Network Services Charge"                     Section 6
"HSA Operational Elements"                        Section 4.1
"HSA Parties"                                     Section 11.3
"HSA Termination Event"                           Section 13.3
"Initial Term"                                    Section 7.1
"Intellectual Property Laws"                      Section 14.1.5
"Launch Fee"                                      Section 9.1
"Minimum Thresholds"                              Section H of EXHIBIT 1
"Miscellaneous TTM Charge"                        Section M.1. of EXHIBIT 1
"Non-Qualified Call" or "NQC"                     Section H of EXHIBIT 1
"NQC Charges"                                     Section H of EXHIBIT 1
"NQC Notice Period"                               Section H of EXHIBIT 1
"Person"                                          Section 1.2
"Proceeding"                                      Section 11.7
"QOS Requirements"                                Section I.1. of EXHIBIT 1
"Qualified Call"                                  Section H of EXHIBIT 1
"Replacement System"                              Section 9.2.
"RF"                                              Preamble paragraph A
"Second Anniversary"                              Section 2.3
"Site Survey"                                     Section 2.2 of EXHIBIT 2
"SPOC" or "SPOCs"                                 Section I of EXHIBIT 1
"Statement"                                       Section 8.5
"Systems" or "Cable Systems"                      Preamble paragraph A
"Termination Fee"                                 Section 13.5
"Term"                                            Section 7.1
"Ticket"                                          Section H of EXHIBIT 1
"TTM"                                             Section A.1. of EXHIBIT 1
"VAR Support Call"                                Section L of EXHIBIT 1
"Warrant Shares"                                  Section 13.1.2 2.
</TABLE>

   2. EXCLUSIVE RIGHT TO PROVIDE HSA NETWORK SERVICES/AUTHORIZATIONS TO PROCEED.

         2.1 Subject to the terms and conditions of this Agreement, Charter
hereby grants and licenses to HSA for the Term, and HSA accepts from Charter for
the Term, the sole and exclusive right and privilege to provide the HSA Network
Services described in EXHIBIT 1 hereto in the Committed Network Systems;
provided, that such right shall not be an exclusive right in any System (i)
previously launched, for which there are existing services as of the date of
this Agreement, (ii) acquired by Charter in the future, for which there are
existing services as of the date of the acquisition of such System, and (iii)
where it is reasonably necessary to comply with any statutes, regulations or
court orders; provided further, that, in the case of clauses (i) and (ii), such
right shall not be an exclusive right only until such time as the

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provider of such existing services no longer provides the services or is
otherwise transitioned out as a provider of such services.

         2.2 HSA agrees that, in the geographic areas where HSA and Charter do
business together under this Agreement, it will devote all of its business
activities exclusively as a provider to Charter of the HSA Network Services.

         2.3 Charter shall not be required to commit any particular System so
long as Charter commits and releases to HSA (as described in Section 2.5 below)
Systems containing at least (i) an aggregate of 2,000,000 homes passed
(including all homes passed in systems previously committed by Charter to HSA,
other than full turnkey systems) on or prior to May 12, 2001, (ii) an aggregate
of 3,500,000 homes passed (including all homes passed in systems previously
committed by Charter to HSA, other than full turnkey systems) on or prior to May
12, 2002 (the "Second Anniversary"), and (iii) an aggregate of 5,000,000 homes
passed (including all homes passed in systems previously committed by Charter to
HSA, other than full turnkey systems) on or prior to May 12, 2003. Homes passed
in Systems previously committed by Charter to HSA pursuant to prior agreements
or arrangements between Charter and HSA, other than full turnkey systems, may be
included, at Charter's option, for purposes of satisfying the goals set forth in
the preceding sentence.

         2.4 During the Term, Charter shall have the right to designate
Additional Committed Network Systems. Such right shall extend to any and all
Cable Systems now owned or hereafter owned, acquired or managed by Charter, and
shall be exercised by written notice from the Charter Single Point of Contact to
the HSA Single Point of Contact (an "Additional Committed Network System
Notice"); provided, that in any Committed Network System or Additional Committed
Network System where services similar to the HSA Network Services are already
being performed by Charter or some other third party, Charter and HSA shall
agree on a case-by-case basis, to the terms and conditions for converting such
System for HSA Network Services, but only to the extent Charter and HSA
determine that there is a conversion process necessary.

         2.5 Notwithstanding the foregoing, HSA shall not deploy or perform HSA
Network Services for any Committed Network System unless and until such
Committed Network System has been released to HSA under an "Authorization to
Proceed" or "ATP" signed by the Charter Single Point of Contact as Systems are
certified by Charter as ready to provide personal computer-based data services
to residential customers. Charter will use its best efforts to provide HSA with
a projected list of scheduled Launch Dates for the following year.

         2.6 Charter and HSA agree that, upon the execution and delivery of this
Agreement, the Montivallo and Gardendale, Alabama systems shall be placed on
EXHIBIT 3 hereto and deemed for all purposes to be Committed Network Systems
under this Agreement, and that the Additional System Notice and Partial HSAC
Services Supplement, dated April 28, 1999, between HSA and Charter is hereby
revoked and cancelled in all respects without penalty to either party.

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     3. GENERAL OBLIGATIONS OF CHARTER. Charter covenants and agrees to:

         3.1 perform the services and operational elements described in EXHIBIT
1 and, if applicable, EXHIBIT 2 (the "Charter Operational Elements") in
accordance with industry standards and the terms of this Agreement;

         3.2 maintain all connection interfaces of the Charter facilities to the
Committed Network Systems, operate, and maintain and repair its RF-plant/system
(including, without limitation, all coaxial cable, head-end equipment,
connectors, amplifiers, passive devices/splitters, etc.) at its own cost and
expense in accordance with cable plant specifications as prescribed by FCC Part
76 regulations, and repair all line cuts and eliminate signal ingress, egress,
leakage or interruptions in the Committed Network System affecting more than 100
customers that cause variances from such specifications, i.e., to the extent a
service failure is traceable to an RF plant defect or malfunction, Charter will
provide technical personnel within 4 hours or less (or as soon as commercially
practicable) to repair and/or respond to such service failure;

         3.3 operate one or more customer support/call centers on a 24 x 7 basis
accessible by toll-free telephone number staffed with an adequate number of
trained representatives to respond to calls and resolve inquiries from Data
Subscribers in the Committed Network Systems regarding Tier 1 troubleshooting
and support as set forth in EXHIBIT 1 (including ATTACHMENT 1-A thereto),
billing and video/RF plant service failures, and escalate Qualified Calls to
HSA;

         3.4 operate its billing systems to invoice Data Subscribers and remit
to HSA the HSA Network Service Charges, NQC Charges (if any), Deployment TTM
Charges (if any), and Miscellaneous TTM Charges (if any) as provided in Section
8 and EXHIBIT 1 and, if applicable, EXHIBIT 2; and

         3.5 comply with all Applicable Laws.

     4. GENERAL OBLIGATIONS OF HSA. HSA covenants and agrees:

         4.1 to perform the service and operational elements described in
EXHIBIT 1 and, if applicable, EXHIBIT 2 (the "HSA Operational Elements") on
behalf of Charter in respect of the Committed Network Systems in accordance with
the terms of this Agreement;

         4.2 that the HSA Network Services to be performed, the level of
performance thereof and the prices to be charged therefor shall at all times
conform to industry standards and shall be at least comparable to, and remain
competitive with, the type of, performance level of and price of services
provided by other providers of services similar to the HSA Network Services;

         4.3 that if HSA offers services comparable to the HSA Network Services
to other parties, it shall extend the same price and terms for such services to
Charter;

         4.4 to operate one or more 365 x 24 x 7 customer support/call center(s)
and data centers (NOCs) accessible by toll-free telephone number staffed with an
adequate number of trained

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representatives to accept and resolve Qualified Calls/Tier 2 inquiries from Data
Subscribers, all as more specifically set forth in EXHIBIT 1 (including
ATTACHMENT 1-A thereto); and

         4.5 comply with all Applicable Laws.

     5. INTELLECTUAL PROPERTY.

         5.1 Charter acknowledges that the names and marks "HSA", "HSA Network",
"High Speed Access Network", the "HSA Data Network" and other HSA logos, program
names, trademarks, service marks, domain names, meta tags, programs, manuals,
documentation, codes and other support materials covered by this Agreement or
otherwise used by HSA, are the exclusive property of HSA. Charter has not and
will not acquire any proprietary rights thereto by reason of this Agreement, and
Charter shall have no rights to use such names, marks, logos, variations or
titles except at the times and in a manner expressly approved by HSA.

         5.2 HSA acknowledges that the names and marks "Charter," "Charter
Communications," "Wired World," "Charter Pipeline," "Charter Digital,"
"Chartercom.com" and "Charter.net," and other Charter-related logos, programs,
names, trademarks, service marks, domain names, meta tags, programs, manuals,
documentation, codes and other support materials covered by this Agreement or
otherwise used by Charter or its affiliates, are the exclusive property of
Charter or such affiliate. HSA has not and will not acquire any proprietary
rights thereto by reason of this Agreement, and HSA shall have no rights to use
such names, marks, logos, variations or titles except at the times and in a
manner expressly approved by Charter.

     6. AMENDMENT TO CLASS A WARRANT AND CLASS B WARRANT.

         6.1 Simultaneously with the execution of this Agreement, Charter and
HSA shall enter into an Amended and Restated Securities Purchase Warrant
substantially in the form of EXHIBIT 5 hereto (the "Amended Warrant" that will
amend and restate the Class A Securities Purchase Warrant No. R001, dated
November 25, 1998 and Class B Securities Purchase Warrant No. R001, dated
November 25, 1998.

         6.2 The Amended Warrant shall:

                  6.2.1 subject to approval by HSA's board of directors, provide
for the issuance upon exercise by Charter (to the extent earned) of up to
12,000,000 shares (subject to adjustment) of Common Stock; par value $0.01, of
HSA (the "Warrant Shares"), and entitle Charter to earn and purchase Warrant
Shares in an amount equal to the number of Homes Passed in Committed Network
Systems and Additional Committed Network Systems (i) on a .775 Warrant Share per
every home passed basis at a strike price of Three Dollars and Twenty Three
Cents ($3.23) per share (subject to adjustment) for an aggregate commitment of
up to Five Million (5,000,000) homes passed under this Agreement (without
reference to full turnkey systems committed by Charter to HSA under the First
Network Services Agreement), (ii) on a 1.55 Warrant Share per every home passed
basis at a strike price of Three Dollars and Twenty Three Cents ($3.23) per
share (subject to adjustment) for additional homes passed under this

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Agreement (without reference to full turnkey systems committed by Charter to HSA
under the First Network Services Agreement), and (iii) on a 1.55 Warrant Share
per every home passed basis for homes passed in systems committed by Charter to
HSA under the First Network Services Agreement (without reference to homes
passed under this Agreement);and

                  6.2.2 provide that Warrants earned under this Agreement shall
vest (i.e., be eligible for exercise) at such time as the applicable home passed
is or becomes part of a Committed Network System under Section 2 of this
Agreement, provided that the Warrants earned under this Agreement may only be
exercised to the extent of homes passed released for deployment under Section
2.5 hereof for HSA Network Services under an ATP (this condition applies only to
Committed Network Systems and not to full turnkey systems under the First
Network Services Agreement).

         6.3 Upon any renewal of this Agreement with respect to any or all of
the Committed Network Systems for additional terms of five (5) years (each a
"Renewal Term"), HSA will provide to Charter on the respective renewal date,
additional securities purchase warrants (each a "Renewal Warrant") that will
entitle Charter to earn and purchase Warrant Shares in an amount equal to the
number of homes passed in Committed Network Systems on a one-half (.5) Warrant
Share per every home passed basis at a strike price of Ten Dollars ($10.00) per
share (subject to adjustment). The number of Warrant Shares subject to the
Renewal Warrant shall be determined based upon the number of homes passed
committed to HSA during the initial 5-year term and each 5-year renewal term.

         6.4 The Amended Warrant and Renewal Warrants earned under this
Agreement shall be exercisable with respect to the Committed Network Systems
covered under this Agreement for a period of seven and one-half (7 1/2) years
after the date such rights are earned in each instance, and shall not expire
until the right to purchase all Warrant Shares earned have been exercised or are
no longer exercisable.

         6.5 As of June 30, 2000, and continuing on a quarterly basis
thereafter, Charter shall deliver, and HSA shall agree to and accept, the
Warrant Receipt (as defined in the Amended Warrant), in accordance with the
terms of the Amended Warrant.

     7. TERM OF AGREEMENT; EXPIRATION.

         7.1 The term of this Agreement shall commence effective as of the date
set forth in the preamble hereto, and continue for a term of five (5) years (the
"Initial Term" and, together with any Renewal Terms, the "Term"), as long as HSA
provides the HSA Network Services as set forth in this Agreement continuously
throughout the Term, Charter's obligation to pay HSA Network Services Charges
with respect to any particular Committed Network System committed to HSA during
the term shall survive for a period of five (5) years from the date such
Committed Network System is launched. Charter shall have the option to renew
this Agreement for additional successive Renewal Terms on the same terms and
conditions (except for the Launch Fee); provided, that Charter's obligation to
pay HSA Network Services Charges with respect to that Committed Network System
shall also be extended by an additional 5-year period; provided further, that
the HSA Network Services Charges applicable to Committed Network Systems where
Charter received a Launch Fee described in Section 8.1 hereof shall

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be reduced during the Renewal Term such as to become equivalent with the HSA
Network Services Charges applicable to Committed Network Systems described in
Section 8.2 hereof.

               7.2 For purposes of Section 7.1 above, (a) if a Committed Network
System is expanded or a System that was not previously committed to HSA is added
to such Committed Network System, or (b) if two or more Committed Network
Systems are combined into one Committed Network System (any of the foregoing, a
"Change"), HSA's obligation to provide the HSA Network Services and Charter's
obligation to pay HSA Network Services Charges shall be extended in accordance
with the following:

         (a)      in the case of the expansion of a Committed Network System or
                  the addition of a System that previously was not committed to
                  HSA, the number of months added to the initial 5-year term
                  shall be determined based on the following formula:

                      (AxB)/(B+C), where

                           A   =    the number of months expired from the date
                                    of launch under the initial 5-year term
                                    until the date of the Change,

                           B   =    the number of Homes Passed added to the
                                    Committed Network System as a result of the
                                    Change, and

                           C   =    the number of Homes Passed in the
                                    Committed Network System prior to the
                                    Change; and

         (b)      in the case of the combination of two or more launched
                  Committed Network Systems, the number of months added to the
                  term of the first of such Committed Network Systems to be
                  launched shall be determined based on the following formula:

                      (AxB)/(B+C), where

                           A   =    the difference in the number of months
                                    expired from the date of launch under the
                                    initial 5-year term until the date of the
                                    Change,

                           B   =    the number of Homes Passed in the
                                    Committed Network System launched last, and

                           C   =    the number of Homes Passed in the
                                    Committed Network System launched first.

         8. FEES FOR SERVICES. During the Term, Charter will compensate HSA for
the HSA Network Services (the "HSA Network Services Charges") as follows:

               8.1 With respect to each Committed Network System for which HSA
pays Charter a Launch Fee, Charter shall pay to HSA $7.50 per month per Charter
PC Data Subscriber for the first year

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from the date such Committed Network System is launched, and $8.31 per month
(CPI-adjusted once annually) per Charter PC Data Subscriber for the following
four (4) years thereafter.

         8.2 With respect to all other Committed Network Systems, Charter shall
pay to HSA $7.50 per month (CPI-adjusted once annually after the first year) per
Charter PC Data Subscriber for five (5) years from the date such Committed
Network System is launched.

         8.3 In addition to the HSA Network Services Charges described in
Sections 8.1 and 8.2 above, which charges HSA warrants will be, throughout the
Term hereof, generally competitive with industry standards for the volume and
scope of services provided, Charter will also compensate HSA for HSA Network
Services that exceed the Minimum Thresholds (i.e., NQC Charges, VAR Support
Calls) as set forth in EXHIBIT 1 hereto:

                  8.3.1 Any invoiced Deployment Services and Deployment TTM
Charges (which may be billed on a completed or progress basis by HSA) shall be
based upon estimates provided by HSA (i.e., a "Deployment Estimate") and
approved/accepted by Charter (through the respective HSPOC and CSPOC) prior to
performance. HSA's Deployment Estimates will be based upon and are qualified by
the system questionnaire/Head-End Record information furnished by Charter. In
the case where Charter selects HSA to perform Deployment Services prior to
completion and receipt of the Head-End Record, HSA's Deployment Estimate will be
based upon HSA's Site Survey results; and

                  8.3.2 Any invoiced Miscellaneous TTM Charge (which may be
billed on a completed project or progress basis by HSA) shall be based upon an
estimate provided by HSA and a standard rate card to be developed by HSA and
approved/accepted by Charter (through the respective HSPOC and CSPOC) prior to
performance.

         8.4 As used herein, "CPI-adjusted" means that effective as of May 1 of
each calendar year during the Term for which a CPI adjustment is to be made to
HSA Network Services Charges in Sections 8.1 and 8.2 hereof, the HSA Network
Services Charge shall automatically be adjusted in accordance with changes in
the Consumer Price Index, All Urban Consumers, All Items (1982-84 = 100) as
published by the Bureau of Labor Statistics, U.S. Department of Labor (the
"CPI"). The CPI figure for December 31, 1999 is established to be the base index
figure. On or before March 1 of each calendar year during the Term for which a
CPI adjustment is to be made, HSA shall provide Charter with a notice setting
forth the CPI figure for the preceding calendar year (December 31) and the
adjustment to the HSA Network Services Charges, effective as of May 1 of that
year and continuing throughout the next twelve (12) months, which shall be an
increase based on the percentage such CPI for the preceding calendar year has
increased as compared with the base CPI figure. There shall be no adjustment if
such CPI figure is lower than the base CPI figure;

         8.5 Within forty-five (45) days following the end of each and every
calendar month during the Term thereof, Charter will deliver to HSA a statement
(a "Statement") showing the computation of (identified by Committed Network
System), and remit a check for, the HSA Network Services Charges, based on the
number of Active Data Subscribers as of the month-end billing cycle and the
books and records maintained by Charter in accordance with generally accepted
accounting principles, consistently applied; provided, that if Charter's beta
extends beyond 60 days in a particular Committed

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<PAGE>   11

Network System, Charter shall commence payment of the HSA Network Service
Charges based on an assumed .3333% per month penetration.

         8.6 HSA will remit to Charter an invoice, which shall be reasonably
detailed (and identified by Committed Network System), covering any
discrepancies in HSA Network Services Charges previously paid by Charter,
Miscellaneous TTM Charges, NQC Charges or VAR Support Call charges, or any
agreed to Deployment Services or Deployment TTM Charges. Charter will remit to
HSA a check for the amount of such invoice within forty-five (45) days following
receipt of HSA's invoice. If Charter objects to any invoice delivered by HSA,
Charter must notify HSA in writing within thirty (30) days following receipt
thereof, setting forth in specific detail the basis for Charter's objection and
Charter's proposal for any adjustments to the invoice. HSA and Charter shall
seek in good faith to reach agreement within thirty (30) days following HSA's
receipt of Charter's written notice of objection. If HSA and Charter are unable
to reach agreement within such time period, then a "Big-5" accounting firm, as
agreed upon by HSA and Charter (the "Third Party Accounting Firm"), shall be
engaged to review the invoice and shall make a determination that represents
either agreement with HSA or with Charter, or a compromise between such
positions. The determination of the Third Party Accounting Firm shall be
delivered as soon as practicable following the engagement of the Third Party
Accounting Firm, and shall be final, conclusive and binding upon HSA and
Charter. The non-prevailing party shall pay the fees and expenses of the Third
Party Accounting Firm.

         8.7 Subject to twenty (20) business days advance notice, during the
Term hereof and for one year thereafter, each party or its authorized
representatives may, at its own expense, visit the other party's offices during
regular business hours, subject to suitable protections relating to
confidentiality and non-disclosure, to inspect books and records to the extent
necessary to verify fees due hereunder. If any audit of Statements, or invoices
undertaken in accordance with this paragraph discloses a discrepancy, the
audited party shall pay such amount to the auditing party as shall be due them,
and if the audit discloses a ten percent (10%) or greater discrepancy, the
audited party shall also reimburse the auditing party for all costs incurred by
the auditing party in connection with such audit. Such examination shall be
limited to fees payable during the then current calendar year and prior calendar
year. Each party shall have the right to audit the final calendar year of the
Agreement up to one year after the expiration or termination of the Agreement.

     9. LAUNCH FEES.

         9.1 With respect to each Committed Network System launched or intended
to be launched on or before the Second Anniversary, within forty-five (45) days
of HSA's receipt of an ATP for such Committed Network System, HSA will pay
Charter, at Charter's option (as specified on the ATP), a launch fee (the
"Launch Fee") of $3.00 per home passed by such Committed Network System;
provided, that with respect to the Committed Network Systems in Long Beach and
St. Louis, the aggregate amount of such Launch Fee shall be $1,000,000.00 for
each such Committed Network System.

         9.2 Charter shall refund such Launch Fee to HSA with respect to a
particular Committed Network System if (i) such Committed Network System is not
launched by November 30, 2002, or (ii) Charter withdraws such Committed Network
System prior to the expiration of this

                                      -11-
<PAGE>   12

Agreement for any reason other than an HSA Termination Event; provided, however,
that Charter shall not be required to refund any Launch Fee to HSA with respect
to any Committed Network System so withdrawn by Charter if (x) within three (3)
months after the date of such withdrawal, Charter commits to HSA a replacement
System or Systems with a comparable number of homes passed and active Charter PC
Data Subscribers (such System or Systems, a "Replacement System"), (y) in the
case where a Committed Network System is withdrawn by Charter because it has
been acquired by a third party, such third party retains HSA as a provider of
HSA Network Services for that System on terms that are not materially less
favorable to HSA than the terms of Agreement, or (z) Charter pays the
Termination Fee to HSA with respect to such System. HSA shall not be required to
pay a Launch Fee on Replacement Systems.

     10. CONFIDENTIAL INFORMATION.

         10.1 Each party agrees that it shall not, during or after the Term of
this Agreement, permit the duplication, use, or disclosure of any Confidential
Information to any person (other than an employee, agent, or representative of
the other party who must have such information for the performance of its
obligation hereunder), unless such duplication, use or disclosure is
specifically authorized by the other party in writing. Without limiting the
generality of the foregoing, each party shall (a) not disclose any Confidential
Information to any third person without the express written consent of the other
party; (b) not use, directly, indirectly, or in concert with any other person,
any Confidential Information for any purpose other than the performance of their
obligations under this Agreement; (c) use reasonable diligence, and in no event
less than that degree of care that such party uses in respect to its own
confidential information of like nature, to prevent the unauthorized disclosure
or reproduction of such information. Without limiting the generality of the
foregoing, to the extent that this Agreement permits the copying of Confidential
Information, all such copies shall bear the same confidentiality notices,
legends, and intellectual property rights designations that appear in the
original versions.

         10.2 Any party obligated to disclose information under law or to
produce information under a court order of competent jurisdiction or valid
administrative or congressional subpoena shall give notice thereof to the other
party and shall reasonably cooperate with any attempt by the party so notified
to enjoin such disclosure or production of information.

         10.3 HSA may for tax, audit and statutory compliance purposes retain a
computer filecopy of Charter's Customer Lists or other accumulated customer care
information until such time as HSA's regular procedures for elimination of such
data would normally delete or destroy such information, provided that HSA shall
maintain the confidentiality of such information and not utilize such
information for its own commercial purposes.

     11. INDEMNITIES.

         11.1 HSA agrees to indemnify and save harmless Charter and its
officers, directors, employees, agents, representatives, affiliates, successors
and assigns (collectively, the "Charter Parties") from any liabilities,
lawsuits, penalties, claims or demands finally awarded or settled (including the
costs, expenses and reasonable attorneys' fees on account thereof)
(collectively, "Claims") that may be made for injuries, including death to
persons, resulting from (i) HSA's negligent or willful acts or omissions or

                                      -12-
<PAGE>   13

those of persons employed by HSA, or (ii) any equipment owned and employed by
HSA to provide the HSA Network Services so long as the injury was not caused by
the injured person.

         11.2 HSA agrees to indemnify and save harmless the Charter Parties from
any Claims arising out of or in connection with HSA's breach (or alleged breach)
of any covenants, warranties or representations made herein.

         11.3 Charter agrees to indemnify and save harmless HSA and its
officers, directors, employees, agents, representatives, affiliates, successors
and assigns (collectively, the "HSA Parties"), from any Claims that may be made
for injuries, including death to persons, resulting from (i) Charter's negligent
or willful acts or omissions or those of persons employed by Charter, or (ii)
any equipment owned and employed by Charter to provide Charter Pipeline so long
as the injury was not caused by the injured person.

         11.4 Charter agrees to indemnify and save harmless HSA from any Claims
arising from Charter's management, operation and control of Charter Pipeline.

         11.4 Charter agrees to indemnify and save harmless the HSA Parties from
any Claims arising out of or in connection with Charter's breach (or alleged
breach) of any covenants, warranties or representations made herein.

         11.5 HSA agrees to indemnify and save harmless the Charter Parties from
any Claims arising from HSA's management, operation, control or provision of the
HSA Network Services.

         11.6 Any person or entity entitled to indemnification hereunder shall
promptly notify the indemnifying party of any action, suit, proceeding or
investigation ("Proceeding") for which the indemnification is sought, provided
that any failure to so notify the indemnifying party will not relieve the
indemnifying party from any liability or obligation which it may have to any
indemnified party except to the extent of any material prejudice to the
indemnifying party resulting from such failure. If any Proceeding is brought
against an indemnified party, the indemnifying party will be entitled to
participate therein and to assume the defense thereof, with counsel reasonably
satisfactory to the indemnified party, within fifteen (15) days after notice
shall have been given to it by the indemnified party pursuant to the preceding
sentence. Each indemnified party will be obligated to cooperate reasonably with
the indemnifying party, at the expense of the indemnifying party in connection
with such defense and the compromise or settlement of any such Proceeding.
Notwithstanding the foregoing, the indemnified party shall have the right to
employ its own counsel in any such case, but the fees and expenses of such
counsel shall be at the expense of such indemnified party unless (i) the
employment of such counsel shall have been authorized in writing by the
indemnifying party in connection with the defense of such action, (ii) the
indemnifying party shall not have employed counsel to have charge of the defense
of such action within a reasonable time after notice of commencement of the
action, or (iii) such indemnified party shall have reasonably concluded that
there may be defenses available to it which are different from or additional to
those available to the indemnifying party (in which case the indemnifying party
shall not have the right to direct the defense of such action on behalf of the
indemnified party), in any of which events such fees and expenses shall be borne
by the indemnifying party. Anything in this Section 11 to the contrary
notwithstanding, an indemnifying party shall not be liable for any settlement or
any claim or

                                      -13-
<PAGE>   14

action effected without its written consent; provided, however, that such
consent shall not be unreasonably withheld.

     12. Limitation of Liability and Disclaimer of Warranty.

         12.1 NOTWITHSTANDING THE INDEMNITIES SET FORTH IN SECTION 11 ABOVE, AND
EXCEPT FOR CHARTER'S PAYMENT OF THE TERMINATION FEE (IF APPLICABLE) AND EXCEPT
AS OTHERWISE SET FORTH IN SECTION 13 HEREOF, IN NO EVENT SHALL HSA AND CHARTER
BE LIABLE TO ONE ANOTHER FOR ANY SPECIAL, INDIRECT, INCIDENTAL, PUNITIVE OR
CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF PROFITS ARISING FROM OR RELATED TO THE
BREACH OF THIS AGREEMENT, EVEN IF HSA OR CHARTER HAD BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. CHARTER AND HSA WILL EACH MAINTAIN APPROPRIATE
POLICIES OF INSURANCE STANDARD IN THE INDUSTRY RELATING TO GENERAL LIABILITY,
CASUALTY AND WORKERS COMPENSATION INSURANCE TO COVER THEIR RESPECTIVE EMPLOYEES
AGAINST INJURY TO THEMSELVES OR OTHERS AND CASUALTY ACCIDENTS WHILE WORKING ON
OR IN THE OTHER'S PREMISES/SYSTEMS.

         12.2 NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, HSA'S AND
CHARTER'S LIABILITIES TO ONE ANOTHER (EXCEPT FOR THE PAYMENT OF ANY APPLICABLE
TERMINATION FEE AND EXCEPT AS OTHERWISE SET FORTH IN SECTION 13 HEREOF) UNDER
THIS AGREEMENT, WHETHER UNDER CONTRACT LAW, TORT LAW, OR OTHERWISE, SHALL BE
LIMITED TO THE ACTUAL AMOUNT OF DAMAGES (AS LIMITED BY SECTION 11 ABOVE)
INCURRED BY CHARTER OR HSA.

     13. TERMINATION EVENTS; EFFECT OF TERMINATION; OTHER.

         13.1 Termination Events. The following shall be deemed "Termination
Events":

                  13.1.1 HSA fails to perform the HSA Network Services with
respect to a particular Committed Network System, or with respect to a material
number of Data Subscribers within a Committed Network System, or fail to comply
with the performance specifications for the HSA Network Services or commits a
material breach of this Agreement, the Amended Warrant or the Registration
Rights Agreement, and has not cured such failure or breach to Charter's
reasonable satisfaction within sixty (60) after Charter has provided HSA with
written notice of such failure or breach;

                  13.1.2 HSA becomes insolvent, or a petition under any
bankruptcy act shall be filed by or against HSA (which petition shall not have
been dismissed within thirty (30) days thereafter), or HSA executes an
assignment for the benefit of creditors, or a receiver is appointed for HSA or
its assets, or HSA takes advantage of any insolvency or any like statute;

                  13.1.3 HSA merges with another party or experiences a change
in control. For the purpose of this Section 13.1.3, a "change in control" shall
occur if (i) any Person or any Persons acting together that would constitute a
"group" (a "Group)") for purposes of Section 13(d) of the Securities Exchange
Act of 1934, or any successor provision thereto, together with any Affiliates or

                                      -14-
<PAGE>   15

Related Persons thereof, shall beneficially own (within the meaning of Rule
13d-3 under the Securities Exchange Act of 1934, or any successor provision
thereto) at least 50% of the aggregate voting power of all classes of voting
stock of HSA, (ii) any Person or Group, together with any Affiliates or Related
Persons thereof, shall succeed in having a sufficient number of its nominees
elected to the board of directors of HSA such that such nominees, when added to
any existing director remaining on the board of directors of HSA after such
election who was a nominee of or is an Affiliate or Related Person of such
Person or Group, will constitute a majority of the board of directors of HSA,
and (iii) the Chief Executive Officer of HSA on the date hereof shall no longer
be employed by HSA in such capacity; provided, that any event described in
clause (i) or (ii) above will not constitute a "change of control" where the
relevant Person or Group, together with any relevant Affiliates or Related
Persons, consists exclusively of HSA, any Affiliate or any Person who is an
officer, director or 10% shareholder of HSA or any Affiliate (or an entity
controlled by any of the foregoing) as of the date of this Agreement. For the
purposes of this definition, (a) the term "Person" shall include an individual,
corporation, partnership, limited liability company, association, trust or other
entity or organization, including a government or political subdivision or an
agency or instrumentality thereof, (b) the term "Affiliate" shall mean a Person
that directly, or indirectly through one or more intermediaries, controls or is
controlled by, or is under common control with, the Person specified, and (c) a
"Related Person" of any Person means any other Person directly or indirectly
owning (1) 5% or more of the outstanding common stock of such Person (or, in the
case of a Person that is not a corporation, 5% or more of the equity interest in
such Person), or (2) 5% or more of the combined voting power of the voting stock
of such Person;

                  13.1.4 Charter defaults in any material respect in the
performance of any of its obligations hereunder, and has not cured such default
to HSA's reasonable satisfaction within sixty (60) after HSA has provided
Charter with written notice of such default; or

                  13.1.5 Charter becomes insolvent, or a petition under any
bankruptcy act shall be filed by or against Charter (which petition shall not
have been dismissed within thirty (30) days thereafter), or Charter executes an
assignment for the benefit of creditors, or a receiver is appointed for Charter
or its assets, or Charter takes advantage of any insolvency or any like statute.

         13.2 HSA Remedies. In addition to all of HSA's other rights and
remedies at law or equity as limited by Section 12 hereof, HSA has the right to
(i) terminate this Agreement, (ii) renegotiate this Agreement, (iii) refuse to
provide HSA Network Services to, or withdraw HSA Network Services from, a
particular Committed Network System, if there has been a Termination Event as
set forth in Sections 13.1.4 or 13.1.5 hereof (each, a "Charter Termination
Event"). HSA's selection of any one of these remedies shall not preclude HSA
from selecting any other of such remedies for the same or other Charter
Termination Event. In the event that a Charter Termination Event occurs which is
limited to a particular Committed Network System, HSA may exercise the forgoing
rights only with respect to the Committed Network System in question and not
this entire Agreement.

         13.3 Charter Remedies. In addition to all of Charter's other rights and
remedies at law or equity as limited by Section 12 hereof, if there has been a
Termination Event as set forth in Sections 13.1.1, 13.1.2 or 13.1.3 hereof
(each, an "HSA Termination Event"), Charter has the right, at its option, to (i)
terminate this Agreement, (ii) renegotiate this Agreement, or (iii) withdraw
such Committed Network

                                      -15-
<PAGE>   16

System or such Data Subscribers, and elect to provide the service directly or
through another provider; provided, that Charter shall not be required to pay
the HSA Network Services Charges with respect to any such Committed Network
System from the date Charter terminates the HSA Network Services with respect to
that Committed Network System, and Charter shall retain the Launch Fee, if any,
and all Warrants under the Amended Warrant and any Renewal Warrants earned prior
to the termination date with respect to such Committed Network System. Charter's
selection of any one of these remedies shall not preclude Charter from selecting
any other of such remedies for the same or other HSA Termination Event. In the
event that an HSA Termination Event occurs which is limited to a particular
Committed Network System, Charter may exercise the forgoing rights only with
respect to the Committed Network System in question and not this entire
Agreement.

         13.4 Actions upon Termination. Except as set forth in Section 13.5 to
the contrary, upon any termination or cancellation of this Agreement as to a
particular Committed Network System for any reason whatsoever: (i) such
Committed Network System shall be removed from EXHIBIT 3 and from this
Agreement, (ii) HSA shall comply with the Conversion Requirements (defined
below) with respect to such Committed Network System; and (iv) HSA shall
transfer to Charter all Confidential Information, Customer Lists, and any data
related to or about the Data Subscribers relating to the applicable Committed
Network Systems. As used herein, "Conversion Requirements" means that HSA will
continue to provide the HSA Network Services to Charter (at Charter's cost on a
direct or pass-through basis from HSA) for a period of not less than 160 days
from the termination date, and will work with Charter to transition Data
Subscribers to any services Charter may offer directly or through another
service provider.

         13.5 Termination other than for an HSA Termination Event. In the event
Charter, prior to the expiration of this Agreement, terminates this Agreement in
whole or in part with respect to a particular Committed Network System or
withdraws a particular Committed Network System that has been committed to HSA
under an ATP for any reason other than an HSA Termination Event, Charter shall
pay to HSA a termination fee (the "Termination Fee") equal to the number of
Homes Passed in the affected Committed Network Systems times:

         (i)      $5.00 if termination occurs in months 1-12 from the Launch
                  Date;

         (ii)     $4.00 if termination occurs in months 13-24 from the Launch
                  Date;

         (iii)    $3.00 if termination occurs in months 25-36 from the Launch
                  Date;

         (iv)     $2.00 if termination occurs in months 37-48 from the Launch
                  Date; or

         (v)      $1.00 if termination occurs in months 49-60 from the Launch
                  Date;

provided that Charter shall not be required to pay the Termination Fee with
respect to such Committed Network System if (a) Charter continues to pay to HSA
the HSA Network Services Charges and, within three (3) months after the date of
such withdrawal, commits a Replacement System to HSA, with respect to which HSA
shall provide the HSA Network Services for the balance of the 5-year term of the
withdrawn Committed Network System plus the number of months that elapsed
between the withdrawal of the original Committed Network System and the
commitment of a Replacement System, or (b) a third-party retains HSA as a
provider of services for that Committed Network System on terms that are not
materially less favorable to HSA than the terms of this Agreement; provided
further, that, whether

                                      -16-
<PAGE>   17

Charter pays such Termination Fee or is not required to pay such Termination Fee
under either clause (a) or (b) above, Charter shall retain the Launch Fee, if
any, and any and all Warrants earned under the Amended Warrant and any Renewal
Warrant, with respect to such Committed Network System.

     14. REPRESENTATIONS AND WARRANTIES.

         14.1 HSA Representations and Warranties. HSA hereby represents and
warrants to Charter as follows:

                  14.1.1 HSA is a corporation duly organized, validly existing
and in good standing under the laws of the state of Delaware, and is duly
qualified to do business as a foreign corporation in all jurisdictions in which
it conducts its business, except where the failure to be so qualified would not
have a material adverse effect on its business.

                  14.1.2 HSA's execution, delivery, and performance of this
Agreement has been duly authorized by all requisite corporate action, and this
Agreement constitutes a legally valid and binding obligation of HSA enforceable
in accordance with its terms, except as may be affected by laws relating to
bankruptcy or insolvency or the application by a court of equitable principles.

                  14.1.3 HSA's execution, delivery, and performance of this
Agreement shall not violate, conflict with and/or result in a breach or default
under HSA's certificate of incorporation, bylaws or other charter documents, or
any judgment, award, decree, agreement or other instrument to which HSA is a
party.

                  14.1.4 No approval, authorization, consent, or order or filing
with any court, or governmental or administrative agency or any third party is
required in order for HSA to enter into, deliver, and perform this Agreement and
the transactions contemplated herein.

                  14.1.5 HSA either owns or has properly licensed all rights
under patent, copyright, trademark, trade secret, and other domestic and foreign
intellectual property laws (collectively, "Intellectual Property Laws") that are
necessary or required to perform the HSA Network Services, including, without
limitation, equipment, software and software licenses that HSA shall use or
shall provide in connection with the HSA Network Services to be performed by HSA
hereunder. HSA's provision and/or operation of the HSA Network Services shall
not violate or infringe any Intellectual Property Laws or violate or infringe
any rights of third parties.

         14.2 Charter Representations and Warranties. Charter hereby represents
and warrants to HSA as follows:

                  14.2.1 Charter is a corporation duly organized, validly
existing, and in good standing under the laws of its jurisdiction of
incorporation and is duly qualified to do business as a foreign corporation in
all jurisdictions in which it conducts its business, except where the failure to
be so qualified would not have a material adverse effect on its business.

                                      -17-
<PAGE>   18

                  14.2.2 Charter's execution, delivery, and performance of this
Agreement has been duly authorized by all requisite corporate action, and this
Agreement constitutes a legally valid and binding obligation of Charter
enforceable in accordance with its terms, except as may be affected by laws
relating to bankruptcy or insolvency or the application by a court of equitable
principles.

                  14.2.3 Charter's execution, delivery, and performance of this
Agreement shall not violate, conflict with and/or result in a breach or default
under its certificate of incorporation, bylaws or other charter documents, or
any judgment, award, decree, agreement or other instrument to which it is a
party.

                  14.2.4 No approval, authorization, consent, or order or filing
with any court, or governmental or administrative agency or any third party is
required in order for it to enter into, deliver, and perform this Agreement and
the transactions contemplated herein.

                  14.2.5 Charter either owns or has properly licensed all rights
under Intellectual Property Laws that are necessary or required to offer and
operate Charter Pipeline, including, without limitation, equipment, software,
software licenses or content that Charter shall use or shall provide in
connection with the Charter Pipeline. Charter's provision and/or operation of
Charter Pipeline shall not violate or infringe any Intellectual Property Laws or
violate or infringe any rights of third parties.

         15. INDEPENDENT CONTRACTORS. All work performed by any party in
connection with the HSA Network Services described in this Agreement shall be
performed by such party as an independent contractor and not as the agent,
employee, joint venturer or partner of the other party. All persons furnished by
any party hereto shall be for all purposes be solely such party's employees or
agents and shall not be deemed to be employees of the other party for any
purpose whatsoever. Each party hereto shall furnish, employ and have exclusive
control of all persons to be engaged in performing their respective services
under this Agreement and shall prescribe and control the means and methods of
performing such services by providing adequate and proper supervision. Nothing
contained herein shall be deemed to create a relationship of joint venture,
associates, principal and agent or partnership between the parties hereto and
neither party shall hold itself out of the contrary. Each party is acting as
principal hereunder.

         16. FORCE MAJEURE. Neither party shall be responsible for any delay or
failure in performance of any part of this Agreement to the extent that such
delay or failure is caused by fire, flood, explosion, war, lightning, embargo,
government requirement, riots or civil commotion, acts of civil or military
authority, strikes or other labor unrest, shortages of materials or supplies,
power failures/surges, acts or omissions of global internet Access providers or
telecom carriers/utilities, acts of God or other similar causes or contingencies
beyond its reasonable control (i.e., a "Force Majeure"). Such party's
performance of its obligations hereunder shall be suspended during such period;
provided, that such party shall be obligated to use commercially reasonable
efforts to cure any such delay or failure to perform as promptly as possible to
the extent it relates to its portion of the general obligations under this
Agreement; provided, further, that the party invoking the protections herein
stated shall as soon as reasonably

                                      -18-
<PAGE>   19

practicable, give the other party notice of the event and a projection of the
period in which such party expects to effect a cure.

         17. ASSIGNMENT. HSA shall not have the right to assign this Agreement
to any Person without the prior written consent of Charter, except that HSA may,
without Charter's consent, assign its rights, but not its obligations, to a
subsidiary of HSA; provided, that no such assignment shall relieve HSA of
liability for its obligations under this Agreement. Charter may assign this
Agreement to any Person, and this Agreement shall be binding and inure to the
benefit of its successors and assigns. Each party shall be permitted to
collaterally assign and grant a security interest in its contract rights arising
under this Agreement to secure financing from its commercial lenders. All
assignments in contravention of this Section 17 shall be null and void and of no
force and effect. Either party shall provide the other party with thirty (30)
days prior written notice of any permitted assignment hereunder.

         18. AMENDMENTS, MODIFICATIONS, OR SUPPLEMENTS. The parties may amend,
modify or supplement this Agreement provided that it is done in writing signed
by the authorized representatives of each party and all such changes reference
this Agreement and identify the specific articles or sections to be amended,
modified, or supplemented.

         19. NOTICES. All notices, demands, or other communications herein
provided to be given or that may be given by any party to the other shall be
deemed to have been duly given when made in writing and delivered in person, or
upon receipt, if: (a) deposited in the U.S. mail, postage prepaid, certified
mail, return receipt requested; or (b) sent by nationally recognized overnight
courier, and addressed as follows:

               Notices to HSA:       HIGH SPEED ACCESS CORP.
                                     4100 E. Mississippi Ave., Suite 1150
                                     Denver, CO  80246
                                     Attn:    Dan O'Brien, CEO
                                     Phone:   303-256-2000, fax:  303-256-4558

               With a copy to:       HIGH SPEED ACCESS CORP.
                                     4100 East Mississippi Ave., Suite 1150
                                     Denver, CO  80246
                                     Attn:    John G. Hundley, General Counsel
                                     Phone:   502-515-3342, fax:  502-515-3101

                                      -19-
<PAGE>   20

               Notices to Charter:   CHARTER COMMUNICATIONS, INC.
                                     12444 Powerscourt Dr., Suite 400
                                     St. Louis, MO  63131
                                     Attn:    Steven E. Silva
                                     SVP of Technology
                                     Phone:   314-965-0555
                                     Fax:     314-909-0801

               With a copy to:       CHARTER COMMUNICATIONS, INC.
                                     12444 Powerscourt Dr., Suite 400
                                     St. Louis, MO  63131
                                     Attn:    Curt Shaw, Senior Vice President
                                              and General Counsel
                                     Phone:   314-965-0555
                                     Fax:     314-965-8793

or to such address as the parties may provide to each other in writing from time
to time.

         20. OBLIGATIONS TO SURVIVE. The parties recognize and agree that the
obligations of the other party under Sections 1, 5, 6, 10, 11, 12, 13, 15 and 17
through 30 of this Agreement shall survive the termination or expiration of this
Agreement.

         21. GOVERNING LAW. The validity, construction, interpretation, and
performance of this Agreement shall be governed by and construed in accordance
with the laws (without reference to the conflicts of laws rules) of the State of
Delaware.

         22. EQUITABLE RELIEF. HSA acknowledges that the HSA Network Services
set forth herein are of a special, unique and extraordinary character which
gives it a peculiar value, the loss of which may not be adequately or reasonably
compensated by damages in an action at law, and that HSA's failure to perform
its obligations under this Agreement shall cause Charter irreparable injury or
damage. In addition to any other right or remedy given to Charter under this
Agreement or at law or in equity, including injunctive relief, Charter shall, in
the event HSA fails to perform its obligations under this Agreement, be entitled
to specific performance relief.

         23. HEADINGS. The headings contained in this Agreement are for
convenience of reference only and are not intended to have any substantive
significance in interpreting this Agreement.

         24. WAIVERS. Any waiver by either party of any breach of any term or
condition hereof shall be effective only if in writing and such writing shall
not be deemed to be a waiver of any subsequent or other breach, term or
condition of this Agreement. No failure or delay on the part of any party in
exercising any right, power or remedy hereunder shall operate as a waiver
thereof; nor shall any single or partial exercise of any such right, power or
remedy preclude any other or further exercise thereof or the exercise of any
other right, power or remedy hereunder.

                                      -20-
<PAGE>   21

         25. AUTHORITY; NO CONFLICTING AGREEMENT. The officers signing on behalf
of the parties to this Agreement acknowledge that they have read and understand
this Agreement and hereby warrant that each has full power and authority to
execute this Agreement and bind the respective parties hereto. Each party
further represents that it is not bound by any other agreement that would
prevent full performance of this Agreement.

         26. ENTIRE AGREEMENT. This Agreement and the Exhibits and Attachments
hereto (which are incorporated herein by and where reference is made thereto),
together with the Amended Warrant (and any Renewal Warrant) and the Registration
Rights Agreement constitute the entire agreement among the parties hereto with
respect to the HSA Network Services to be provided hereunder, and replaces and
supersedes all prior agreements, written and oral, relating to the subject
matter hereof, between and among the parties to this Agreement.

         27. SEVERABILITY. If any provision of this Agreement shall be held to
be illegal, invalid or unenforceable under present or future laws, such
provision shall be fully severable, this Agreement shall be construed and
enforced as if such illegal, invalid or unenforceable provision had never
comprised a part of this Agreement, and the remaining provisions of this
Agreement shall remain in full force and effect and shall not be affected by the
illegal, invalid or unenforceable provision or by its severance from this
Agreement.

         28. RIGHTS AND REMEDIES CUMULATIVE. The rights and remedies provided by
this Agreement are cumulative and the use of any one right or remedy by any
party shall not preclude or waive the right to use any or all other remedies.
Such rights and remedies are given in addition to any other rights the parties
may have by law, statute, ordinance or otherwise.

         29. EQUAL CONSTRUCTION. This Agreement is negotiated and drafted by
parties equally represented by counsel, and no clause or provision herein should
be construed as having been drafted other than equally by both parties.

         30. COUNTERPARTS. This Agreement may be executed in counterparts, each
of which is an original and all of which, taken together, shall constitute a
single instrument.

                      [THIS SPACE IS INTENTIONALLY BLANK.]

                                      -21-
<PAGE>   22

         IN WITNESS WHEREOF, the parties have executed this Agreement effective
as of the day and year first written above.

                                     HIGH SPEED ACCESS CORP.

                                     By: /s/ High Speed Access Corp.
                                        ----------------------------------------
                                        Daniel O'Brien, Chief Executive Officer

                                     CHARTER COMMUNICATIONS, INC.

                                     By: /s/ Charter Communications, Inc.
                                        ----------------------------------------
                                        Curtis S. Shaw, Senior Vice President

                                      -22-
<PAGE>   23

                                    EXHIBIT 1

                       CHARTER/HSA NETWORK SERVICES MODEL
                       (CHARTER IN-HOUSE SYSTEMS SOLUTION)

A.       INTRODUCTION AND MISCELLANEOUS MATTERS.

         A.1 Unless otherwise expressly stated herein, this Exhibit 1 covers
only those HSA Network Services that HSA provides in support of
residential-grade, two-way cable modem customers and one-way cable modem
customers existing in Committed Network Systems in St. Louis and Riverside,
prior to their upgrade to two-way cable modems, in exchange for the HSA Network
Services Charges. Charter will not market additional residential, one-way cable
modem service in Committed Network Systems; provided, that if Charter markets
such residential, one-way cable modem service in Committed Network Systems,
Charter will pay to HSA the incremental cost to HSA resulting therefrom plus
20%.

         A.2 "Commercial-grade" cable modem services, "off-plant" alternative
access technologies and any 56Kbps dial-up services are not covered by this
Agreement. For the purposes of this Agreement, commercial-grade cable modem
services shall mean cable modem services provided to an account (i) located at
an address that is known to be a business address and utilizing cable modem
services not typically used by residential accounts, (ii) priced by Charter as
commercial-grade cable modem services under Charter's rate card, or (iii) that
could reasonably be determined by the parties to have commercial activity based
on upstream bandwidth utilization.

         A.3 Any other services, including any Deployment Services that the
parties may agree to, and other miscellaneous services, shall be charged
separately on a time, travel and materials ("TTM") basis. Except for NQC Charges
and VAR Support Calls, all TTM charges and any other activities and tasks not
specifically covered by this Agreement will be separately negotiated and quoted
and performed pursuant to a SOW/statement of work-purchase orders or Deployment
Estimates signed by respective authorized system managers, and approved at the
corporate level by the HSPOC and CSPOC.

         A.4 HSA shall not be obligated to initiate or perform any HSA Network
Services unless Charter has first submitted to HSA a completed Head-End Record
for each Committed Network Systems. Charter is responsible for completing the
Head-End record document prior to installation of the CMTS and any alpha
testing, and for updating such record as required due to changes at the System
level.

B.       CHARTER GENERAL OPERATIONAL AGREEMENTS. Charter agrees that it will,
         among other things:

         B.1. perform the services and operational elements described in the
paragraph D chart below (the "Charter Pipeline Operational Elements") in
accordance with industry standards and the terms of this Agreement;

         B.2 commencing on or before August 1, 2000, operate one or more
customer support/call centers on a 24 x 7 basis to respond to calls and resolve
inquiries from Charter PC Data Subscribers in the Committed Network Systems
regarding Tier 1 troubleshooting and support as provided

                                      -23-
<PAGE>   24

below and in this Agreement, billing and video/RF Plant service failures, and
escalate Qualified Calls to HSA;

         B.3 operate its billing system to properly track and invoice Charter PC
Data Subscribers, and remit to HSA the Statement, and all HSA Network Services
Charges due, within 45 days following the end of each calendar month during the
Term, and remit to HSA all other ancillary HSA Network Service charges (i.e.,
NQC Charges, VAR Support Calls, etc.) invoiced by HSA within 45 days following
the date of HSA's undisputed invoice.

C.       HSA GENERAL OPERATIONS AGREEMENTS. HSA agrees that it will, among other
         things:

         C.1 perform the services and operational elements described in the
paragraph D chart below (the "HSA Operational Elements") on behalf of Charter in
respect of the Committed Network Systems in accordance with industry standards
and the terms of this Agreement;

         C.2 operate one or more 24 x 7 customer support/call center(s) and data
centers (NOCs) accessible by toll-free telephone number staffed with an adequate
number of trained representatives to accept and resolve Qualified Calls/Tier 2
inquiries from Charter PC Data Subscribers; and

         C.3 operate a management accounting and billing system that will track
and invoice Charter on a monthly basis for all NQC Charges, VAR Support Calls,
TTM Charges, etc.

D.       RESPONSIBILITY CHART. The following chart summarizes the respective
responsibilities of Charter and HSA in provisioning, delivery and support of
residential, two-way and pre-existing one-way Charter Pipeline in Committed
Network Systems. Certain operational elements for Charter Pipeline are discussed
in greater detail following the chart and additional detail regarding Tier 1 v.
Tier 2 support/responsibility guidelines are set forth in ATTACHMENT 1-A. Where
there is a discrepancy between what is summarized in the chart versus what is
summarized in detail following the chart, the detail following the chart shall
govern.

                                      -24-
<PAGE>   25

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
          CHARTER PIPELINE
        OPERATIONAL ELEMENTS           CHARTER      HSA                               NOTES
-------------------------------------  -------    -------   ---------------------------------------------------------
<S>                                   <C>         <C>       <C>
Backbone - National and Regional          X          X      Charter orders, installs, maintains and operates its own
                                                            dedicated network, or accesses Internet cloud through
                                                            Regional National Access Providers
---------------------------------------------------------------------------------------------------------------------
Head-End to Backbone Circuits /LAN        X                 Charter orders and manages/monitors installation and
& WAN                                                       operates and maintains.
---------------------------------------------------------------------------------------------------------------------
Deployment Services:  Site Survey,        X                 Charter performs and is responsible for all Deployment
RF and IP design, configuration,                            Services, unless HSA is engaged to perform these
installation, site coordination,                            services under separate agreement.
and milestone management
---------------------------------------------------------------------------------------------------------------------
DOCSIS CMTS                               X                 Charter purchases, installs, operates and maintains,
                                                            unless HSA is engaged to perform under separate agreement.
---------------------------------------------------------------------------------------------------------------------
At least two 6Mhz Channels, 1             X                 Charter makes available and maintains RF plant up to FCC
downstream, 1 upstream                                      and Charter performance standards
---------------------------------------------------------------------------------------------------------------------
DOCSIS Modems                             X                 Charter purchases all modems and is responsible for all
                                                            retail sales and installs.
---------------------------------------------------------------------------------------------------------------------
Local Sales                               X                 Charter rents and equips all local sales offices, and
                                                            performs all local sales and coordinates all special
                                                            promotions and events.
---------------------------------------------------------------------------------------------------------------------
Install CD-ROM                                       X      HSA provides Charter with customized install CD ROM
                                                            (see below), including User Agreement with Acceptable Use
                                                            and Privacy Policies.
---------------------------------------------------------------------------------------------------------------------
CD-ROM duplication                        X                 Charter makes all needed copies of install CD.
---------------------------------------------------------------------------------------------------------------------
CD-ROM updates                                       X      HSA provides any required customization or upgrades
                                                            to CD-ROM due to periodic changes to Microsoft's
                                                            operating system and Internet Explorer.
---------------------------------------------------------------------------------------------------------------------
Customer installs                         X                 Charter installs an additional cable outlet (if
                                                            required), software for Charter Pipeline, an Ethernet
                                                            card or USB adapter and the cable modem, and provides
                                                            basic customer training. Charter is also responsible
                                                            for any in-home servicing of Charter PC Data
                                                            Subscribers.
---------------------------------------------------------------------------------------------------------------------
Marketing and Customer Acquisition        X                 Charter provides national marketing materials and is
                                                            responsible for the reproduction, distribution and
                                                            customization of those materials. Charter expects to
                                                            achieve 4% annual penetration growth.
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      -25-
<PAGE>   26

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
          CHARTER PIPELINE
        OPERATIONAL ELEMENTS           CHARTER      HSA                               NOTES
-------------------------------------  -------    -------   ---------------------------------------------------------
<S>                                   <C>         <C>       <C>
Cross-Channel Promotion                   X                 Charter provides avails.
---------------------------------------------------------------------------------------------------------------------
CSR Training for Tier 1 Support           X                 Charter provides training for Tier 1 support.  Charter
                                                            provides training facilities and equipment.
---------------------------------------------------------------------------------------------------------------------
"Train the Trainer"                                  X      HSA provides - see below.
---------------------------------------------------------------------------------------------------------------------
Pricing                                   X                 Charter is responsible for all retail pricing decisions.
---------------------------------------------------------------------------------------------------------------------
Customer acquisition and set-up           X                 Charter inputs necessary customer data through an
                                                            HSA-provided interface for all cable modem, e-mail
                                                            and Web Hosting accounts, and the News service
                                                            provisioning, and logs end-user assents to End User
                                                            Agreement.
---------------------------------------------------------------------------------------------------------------------
Tier 1 Customer Care                      X                 Charter performs all Tier 1 customer care services,
                                                            using local staff and/or a national call center,
                                                            including channeling all initial customer calls through
                                                            Charter's customer support center, handling all RF
                                                            troubleshooting, Charter Pipeline sales and
                                                            installation, disconnect, billing, and change in service
                                                            calls.  Charter routes/escalates Tier 2 calls to HSA
                                                            (including IP or PC support) on a 24 X 7 basis.
                                                            Charter's CSRs will have the ability to enter REMEDY
                                                            trouble tickets and PING cable modems by March 31, 2001.
---------------------------------------------------------------------------------------------------------------------
ICON for Pinging Modem and                           X      HSA to provide.
Escalation of Qualified Calls
---------------------------------------------------------------------------------------------------------------------
REMEDY license for Tier 1                 X                 Charter acquires, and may choose to acquire from HSA,
                                                            and maintains.
---------------------------------------------------------------------------------------------------------------------
Tier 2 Customer Care                                 X      HSA performs all Tier 2 customer care.  HSA accesses
                                                            required information from Charter's subscriber database
                                                            such as account status through Charter's billing system.
---------------------------------------------------------------------------------------------------------------------
Tier 3 Customer Care                      X          X      HSA and Charter will consult and agree upon a plan to
                                                            resolve Tier 2 matters that cannot be resolved by Tier 2
                                                            services. This may require local Charter staff
                                                            involvement.
---------------------------------------------------------------------------------------------------------------------
Billing, Provisioning and Data            X                 Charter provisions and bills all modem customers.
Subscriber Account Management
---------------------------------------------------------------------------------------------------------------------
DST/Cable Data and CSG tunneling                     X      HSA to build an interface to Charter's DST and CSG
interface                                                   billing systems
---------------------------------------------------------------------------------------------------------------------
Post-Launch CPE/network                                     Charter is responsible for Internet access, end-user
configuration                                               installation process, and installation materials,
                                                            including the CD ROM
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      -26-
<PAGE>   27

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
          CHARTER PIPELINE
        OPERATIONAL ELEMENTS           CHARTER      HSA                               NOTES
-------------------------------------  -------    -------   ---------------------------------------------------------
<S>                                   <C>         <C>       <C>
National/Regional NOCs, Data              X          X      Charter manages all network capacity through tools
Traffic management                                          provided by HSA. Charter is responsible for procurement
                                                            and maintenance of additional circuit capacity. HSA
                                                            provides backup capacity monitoring and surveillance,
                                                            and Tier 2 troubleshooting as discussed below.
---------------------------------------------------------------------------------------------------------------------
IP Address Sourcing and Capacity          X                 Charter to provide IP Addresses and is responsible
                                                            for insuring adequate capacity.
---------------------------------------------------------------------------------------------------------------------
IP Address Routing added to               X                 HSA will remotely input/configure new IPs into
Router(s)                                                   routers within 48 hours of notification.
---------------------------------------------------------------------------------------------------------------------
National and Local Content and            X
Content Management
---------------------------------------------------------------------------------------------------------------------
Local Content Ad Sales                    X
---------------------------------------------------------------------------------------------------------------------
E-mail                                                X      HSA provides through separate e-mail agreement, which
                                                             shall include a 99% system uptime guarantee.
---------------------------------------------------------------------------------------------------------------------
News                                      X                  HSA provides common news feed to Charter servers and
                                                             is subject to 99% system uptime guarantee.
---------------------------------------------------------------------------------------------------------------------
Local Content Server                      X                  Charter purchases, operates and maintains.
---------------------------------------------------------------------------------------------------------------------
Collocation/Equipment Floor Space                    X
---------------------------------------------------------------------------------------------------------------------
Passwords                                                    Charter and HSA will mutually agree upon a password
                                                             management system.
---------------------------------------------------------------------------------------------------------------------
</TABLE>

E.       CUSTOMER INSTALLATION CD ROM DISK

         HSA will design a CPE System Configuration CD-ROM for RPO Data
Subscribers to facilitate installations in an efficient and repeatable manner.
The software contained on the CD ROM shall address:

               o    Confirmation of the customer's minimum hardware/software
                    requirements*

               [X]  Configuration of the required parameters

               [X]  Delivery/installation of Internet Explorer

               [X]  Delivery/installation of Outlook Express mail client

               [X]  Marketing and sales product materials X| Online tutorial

               [X]  User agreement

                                      -27-
<PAGE>   28

               * MINIMUM REQUIREMENTS ARE DEFINED AS:

                           Minimum of 110M of free space on a hard drive
                           Windows 95/98/2000/NT, LINUX, or Macintosh 7.x or
                           greater operating system
                           16 Mb of RAM
                           CD-ROM drive
                           Ethernet card

         The CDs shall be branded for Charter/Charter Pipeline. Charter is
responsible for the reproduction and reproduction cost of the CDs.

         HSA will expand the CD-ROM to at least remain current with industry
standard install disks. Any re-mastered CD-ROM shall be made available by HSA
within ninety (90) days of general availability (non-beta) of new releases of
Internet Explorer, Outlook Express, Real Player, MS Player and any other major
plug-in which is used by at least 20% of Internet users.

F.       CHANGE MANAGEMENT

         Assuming software upgrades can be installed and managed remotely, HSA
shall comply with the following:

         o     Vendor's General Release of Cable Modem Image/Software release
               tested within 60 days, deployed to alpha head-ends within 90
               days, and released to all head-ends within 180 days.

         o     Vendor's General Release of Image for Router, CMTS or Server
               tested within 60 days, deployed to alpha head-ends within 90
               days, and released to all head-ends within 180 days.

         o     HSA to maintain database of configuration of each head-end,
               including release of software running. Charter is responsible for
               submitting the Head-End Record and for updating information to
               the database, except for changes effected by HSA (which changes
               HSA shall provide notice to Charter regarding).

         o     HSA will use its best efforts to fix any software that directly
               and materially impacts the quality of Charter's service to its
               customers in a negative way.

G.       CHARTER TIER 1 SUPPORT

         Charter is responsible for all marketing, customer acquisition, account
set-up and in-home CPE installation activities. All Charter PC Data Subscribers
requiring technical support must first contact the Charter Help Desk which will
be operated 24 x 7. Charter staff will handle all billing, sales, installation
coordination, change of service, e-mail account maintenance and RF
troubleshooting issues. HSA's Customer Service Center 800/888 transfer number
will be made available only to internal Charter CSR personnel, who will keep it
private/confidential and not give it out to Charter PC Data Subscribers.

                                      -28-
<PAGE>   29

H.       CHARTER TIER 1 SERVICE TICKETING

         Charter Tier 1 personnel will provide initial troubleshooting on all
customer calls using the support guidelines set forth in ATTACHMENT 1-A. Before
Charter's CSR's may transfer a call to HSA's Tier 2 Customer Care Center (HSA
will provide Charter with a GUI icon for this purpose), Charter's CSRs must
first:

                  (i)      verify that the customer's RF video service is
                           working;

                  (ii)     verify that the customer's cable modem lights are
                           flashing (based on the make/model);

                  (iii)    by March 31, 2001 attempt to PING the customer's
                           modem; and

                  (iv)     by March 31, 2001 open a REMEDY Service Ticket (a
                           "Ticket") to capture the customer history and
                           SPECIFIC problem or complaint (e.g., "service isn't
                           working right" is NOT acceptable) in order to
                           expedite resolution (Charter will provide its CSRs
                           with desktop access to the Internet in order to
                           access and operate REMEDY prior to beta in each
                           Committed Network System in order to allow for
                           sufficient CSR training).

         If the non-RF problem cannot be resolved after following all escalation
guidelines set forth in ATTACHMENT 1-A, the customer/call (i.e., a "Qualified
Call") may then be transferred to the HSA Customer Support Center. Any
transferred/escalated call that does not meet the foregoing criteria shall be
referred to herein as a "Non-Qualified Call" or "NQC" and is subject to a
charge/fee per NQC in the amount of the incremental cost thereof to HSA plus 20%
(the "NQC Charge"); provided, that HSA will not accrue or levy NQC Charges to
Charter until all transferred calls exceed the Minimum Thresholds and Charter's
SPOC has had at least 5 days advance notice from HSA (the "NQC Notice Period")
that HSA is receiving NQCs from Charter's Tier 1 CSRs, and the level of such
NQCs exceed two percent (2%) of the Minimum Thresholds; provided further, that
the NQC Charge shall only be accrued or levied on NQCs that exceed 2% of the
Minimum Thresholds and were transferred to HSA after the expiration of the NQC
Notice Period. As used herein "Minimum Thresholds" means the following assumed
contact rate per month:

<TABLE>
<CAPTION>
==================================================================================================================
                               YEAR 1            YEAR 2             YEAR 3             YEAR 4            YEAR 5
                              LAUNCHES          LAUNCHES           LAUNCHES           LAUNCHES          LAUNCHES
==================================================================================================================
<S>                          <C>               <C>                 <C>                <C>               <C>
MONTH 1                          130.0%            125.0%              70.0%              70.0%             70.0%
MONTH 2                          125.0%            120.0%              65.0%              65.0%             65.0%
MONTH 3                          120.0%            115.0%              60.0%              60.0%             60.0%
MONTH 4                          110.0%            105.0%              50.0%              50.0%             50.0%
MONTH 5                          100.0%             95.0%              40.0%              40.0%             40.0%
MONTH 6                           90.0%             85.0%              30.0%              30.0%             30.0%
MONTH 7                           80.0%             75.0%              30.0%              30.0%             30.0%
</TABLE>

                                      -29-
<PAGE>   30

<TABLE>
<S>                          <C>               <C>                 <C>                <C>               <C>
MONTH 8                           70.0%             65.0%              27.5%              27.5%             27.5%
MONTH 9                           60.0%             55.0%              25.0%              25.0%             25.0%
MONTH 10                          50.0%             45.0%              25.0%              25.0%             25.0%
MONTH 11                          40.0%             40.0%              25.0%              25.0%             25.0%
MONTH 12                          37.5%             35.0%              20.0%              20.0%             20.0%
MONTH 13                          35.0%             32.5%              25.0%              19.0%             19.0%
MONTH 14                          32.5%             30.0%              25.0%              19.0%             19.0%
MONTH 15                          30.0%             27.5%              25.0%              19.0%             19.0%
MONTH 16                          27.5%             25.0%              25.0%              19.0%             19.0%
MONTH 17                          25.0%             22.5%              20.0%              19.0%             19.0%
MONTH 18                          22.5%             20.0%              20.0%              19.0%             19.0%
MONTH 19                          20.0%             17.5%              19.0%              19.0%             19.0%
MONTH 20                          20.0%             20.0%              19.0%              19.0%             19.0%
MONTH 21                          20.0%             19.0%              19.0%              19.0%             19.0%
MONTH 22                          20.0%             19.0%              19.0%              19.0%             19.0%
MONTH 23                          20.0%             19.0%              19.0%              19.0%             19.0%
MONTH 24                          19.0%             19.0%              19.0%              19.0%             19.0%
THEREAFTER                        19.0%             19.0%              19.0%              19.0%             19.0%
</TABLE>

I.       HSA TIER 2 SUPPORT

         Once the foregoing Qualified Call criteria are met, HSA's Customer Call
Center and NOC will then accept transferred customer calls and manage the Ticket
to resolution regardless of the nature of the inquiry or escalation, hand-off,
or other situation status as described in ATTACHMENT 1-A. This includes
remaining the "special point of contact" (or "SPOC") for the customer unless
otherwise requested by the customer or arranged through specific customer
agreements.

         If the call is determined to be a NQC, HSA will resolve the problem for
the customer but will return the Service Ticket and activate the NCQ Charge
after the NCQ Notice Period and Minimum Thresholds are exceeded.

                                      -30-
<PAGE>   31

         I.1      QOS/REPORTING:

                  I.1.1 HSA's Tier 2 Call Center/NOC Data Centers (see
discussion below) will provide Ticket resolution services (NET of RF outages,
system sweeps, Non-Qualified Calls, VAR Support Calls and other Force Majeure,
unplanned or uncontrollable events) as follows (the "QOS Requirements") in
accordance with industry averages of performance, and in any event:

                  (i)      on or before December 31, 2000, achieve a 10% or less
                           abandon rate on Qualified Calls;

                  (ii)     on or before December 31, 2000, achieve a 90% answer
                           rate on Qualified Calls within 90 seconds;

                  (iii)    resolve 90% of all Tier 2 trouble calls within 24
                           hours of receipt of Qualified Calls;

                  (iv)     resolve e-mail-only inquiries/problems within 12
                           hours; and

                  (v)      all trunks busy not to exceed 3% measured on a weekly
                           basis.

         HSA will not be held to the above QOS Requirements if there is a
greater than 10% variance in Charter PC Data Subscriber growth or projected
growth under ATPs in any calendar quarter UNLESS Charter has given HSA notice of
such material changes in deployments at least 3 months in advance.

         HSA will report compliance/non-compliance on the foregoing QOS measures
to Charter on a monthly basis, and will provide Charter with weekly unadjusted
call "stats."

                  I.1.2. Unless otherwise noted, HSA will compile the following
data elements by Systems, region and combined totals (prior to any adjustments)
on a daily basis and will report them to Charter on a weekly basis, effective as
of October 1, 2000:

         o    Total number of calls received.

         o    Total number of calls handled by IVRs.

         o    Total number of calls queued to agents.

         o    Total number of calls handled by agents.

         o    Total calls handled by call type, as distributed by the IVR.

         o    Average speed of answer (excluding calls handled by IVRs),
              measured from time queued to an agent.

         o    Average talk time, which shall be reported by HSA on a monthly
              basis.

         o    Average wrap up time, which shall be reported by HSA on a monthly
              basis, but only to the extent HSA is capable of and is generating
              such information for itself.

                                      -31-
<PAGE>   32

         o    Service level percentage based on 90 seconds.

         o    Total number of calls redirected to systems, but only to the
              extent HSA is capable of and is generating such information for
              itself.

         o    Total number of calls abandoned once queued to an agent.

         o    Average length of abandoned calls, measured from time queued to
              an agent.

         o    All trunks busy exceeding 3% total time.

         o    Unique caller information summary and detail, which shall be
              reported by HSA on a monthly basis, but only to the extent HSA is
              capable of and is generating such information for itself.

         o    Total number of trouble tickets opened.

         o    Total number of trouble tickets resolved immediately.

         o    Total number of trouble tickets resolved within 1 to 24 hours.

         o    Total number of trouble tickets resolved after 24 hours.

         HSA and Charter may agree to additional reporting obligations.
Additionally, within 45 days of the availability of e-mail tracking software,
HSA and Charter will agree on e-mail reporting obligations.

         HSA will not be required to comply with these QOS Requirements and
reporting obligations with respect to Tier 2 calls from one-way cable modem
customers.

         I.2      Training:

         HSA will provide the following "train the trainer" training:

                  (i)      Three (3) days at Charter-provided facility/site to
                           include Internet 101, Internet head-end
                           engineering/architecture for technical positions, CSR
                           Tier 1 roles/responsibilities,
                           escalation/trouble-shooting procedures, and FAQs.
                           Training materials will be provided as leave-behind
                           for Charter trainers.

                  (ii)     Two (2) days of training at an HSA-designated
                           facility, with heavy focus on software application
                           training for FRED, REMEDY and CNR using the HSA
                           learning lab. Attendees will spend time in the HSA
                           Help Desk and NOC, attend a session on Internet
                           architecture and engineering issues and review
                           approved process and procedures. HSA will cover
                           travel expenses for up to 2 attendees per Committed
                           Network System, PROVIDED travel is booked at least 2
                           weeks in advance through HSA-approved travel agent.

                                      -32-
<PAGE>   33

J.       COMPLIMENTARY ACCOUNTS

         HSA will support complimentary HSA Network Services to a number of
Charter PC Data Subscriber accounts equal to one hundred percent (100%) of the
number of Charter employees employed full-time directly by and for such
Committed Network System, at a rate of 25% each quarter after the launch of such
Committed Network System so that, by the first anniversary of such launch, HSA
will be supporting complimentary HSA Network Services to all such persons. Upon
request by HSA, Charter will send to HSA a list of all Charter employees
employed full-time by each Committed Network System; provided, that the number
of such requests by HSA does not exceed four (4) annually. Charter's monthly
statements will detail all comps per Committed Network System and the value
thereof.

K.       [RESERVED.]

L.       INSTALLATION AND INSTALLATION SUPPORT HELPLINE

         Charter is responsible for all CPE/AO installation activity. This
includes all scheduling, training and management of installation capacity. HSA's
Call Center will offer technical support assistance to Charter's PC
technicians/installers/VARs who require such assistance (the "VAR Support Call")
for $40 per call. Charter shall require that all such Tech Install Calls be
routed first through a Charter representative. Any Tech Install Calls escalated
to HSA will be handled by HSA with the Charter representative present on the
call.

M.       INTERNET ACCESS/BACKBONE CAPACITY

         M.1      CIRCUIT MANAGEMENT

         Charter is solely responsible for insuring that capacity is adequate on
its circuits to provide a satisfactory customer experience (speeds, access,
etc.), and must provide HSA with an MOP at least seven (7) days prior to alpha.
Charter and HSA agree that the "Capacity Thresholds" will be when average data
traffic on existing circuit(s) reaches the lesser of (A) 80% during peak time,
and (B) 50% during any 24-hour day, tested in 5 minute increments, in any
particular Committed Network System. HSA will provide immediate written notice
to Charter when any Capacity Threshold has been reached. Charter will also
manage the ordering and physical installation process. If the MRTG (see below)
has indicated that data traffic on circuits in a particular Committed Network
System exceeds the Capacity Thresholds AND the Ticket customer statement data
field reflects complaint as "service is slow" or "operable but downloads are
real slow," etc., then any such transferred calls above and beyond the Minimum
Thresholds set forth in Section H of this Exhibit 1 will be charged to Charter
at HSA's incremental cost plus 20%.

         When Charter turns up a new circuit, it will notify HSA in writing.
Upon notification, an HSA engineer will add the routes to the router and
communicate with Charter's backbone provider within 48 hours. All router/routing
changes effected by HSA shall be completed from a remote location. Any changes
to the router that require HSA to perform on-site assistance will be charged
separately on a TTM basis (i.e., a "Miscellaneous TTM Charge").

                                      -33-
<PAGE>   34

         M.2      EQUIPMENT - ROUTERS, ETC.

         In addition to adequacy of circuits discussed above, Charter is
responsible for insuring that adequate equipment and equipment capacity is
available to support additional circuit capacity. Any changes or upgrades to
head-end equipment are the responsibility of Charter. HSA shall be entitled to
assess a Miscellaneous TTM Charge to Charter if HSA is requested to assist in
monitoring, ordering or upgrading equipment to support additional bandwidth. Any
transferred calls above and beyond the Minimum Thresholds set forth in Section H
of this Exhibit 1 attributable to inadequate head-end equipment capacity are
subject to a charge of HSA's incremental cost plus 20%.

         M.3      CAPACITY MANAGEMENT SOFTWARE

         HSA will use MRTG software to monitor circuit capacity, and will
configure MRTG to alert Charter when a circuit reaches the Capacity Thresholds.
Charter is responsible for insuring adequate capacity on a timely basis and will
provide required circuit information to HSA. HSA will input data into MRTG
within 48 hours of written notification from Charter for each circuit and
provide Charter web access to view each of its circuits. This information is
available on a real-time basis in 5-minute increments. Special Note: Other than
as provided above with respect to MRTG alerts, it is NOT HSA's responsibility to
manage bandwidth for the Committed Network Systems. While HSA's NOC will provide
manual `backup' bandwidth monitoring, it is not the NOC's responsibility to
notify Charter if bandwidth is inadequate.

N.       IP ADDRESS MANAGEMENT

         Charter will be responsible for sourcing all IP addresses, and for
monitoring whether sufficient addresses exist. HSA will add new addresses
provided by Charter to the DHCP servers within 48 hours of written notification.
HSA may charge an "Expedite Fee" of $1 per IP address (not per block of IP
addresses) if Charter requests that such IP addresses be entered sooner than 48
hours. HSA will support static IP addresses manually where the customer already
has one, and automatically once the flow-through provisioning is in place. HSA
will also support multiple tiers of speeds once HSA can do so automatically.

O.       DATA CENTER SERVICES

         HSA's Technical Operations group manages and maintains multiple
"Regional Data Centers." With respect to RPO, RSC personnel are responsible for
fulfilling the following levels of operations:

         [X]      Proper server operation (provisioning, DNS)

         [X]      Server sizing and utilization appropriate to services offered
                  and volumes experienced and anticipated

         [X]      Operating system administration and maintenance

         [X]      User partitioning and security management

         [X]      E-mail account management and administration (to be mutually
                  agreed to by the parties)

         [X]      Support of both UNIX and NT systems

         [X]      Remedy support

                                      -34-
<PAGE>   35

         [X]      Oracle support

         [X]      Web hosting

         [X]      Security

         O.1.     STANDARD RPO SERVICES

         HSA provides Charter with the following services to each Charter PC
Data Subscriber covered under this Agreement from HSA's multiple Regional Data
Centers:

E-mail:                    HSA will provide E-mail accounts (the terms of which
                           shall be mutually agreed to by Charter and HSA).

Web Hosting:               HSA will provide 10 megabytes of Web hosting space
                           for personal home pages. HSA may charge more for
                           additional space (such charger to be mutually agreed
                           to by Charter and HSA)

News:                      HSA will provide a common News feed.

Access/Authentication:     HSA will provide access and authentication services
                           for the above-mentioned services and for cable modem
                           access validation.

         O.2      SECURITY

         HSA will be responsible for securing data residing in all
HSA-controlled, HSA-monitored, or HSA-configured (or configurations approved by
HSA) devices that support residential Charter Pipeline service in Committed
Network Systems subject to HSA Network Services; provided, that HSA shall not be
required to take non-industry standard actions to secure data residing in or
data flowing through such devices, or data residing in or flowing to and from
Data Subscribers' PCs (by firewall or otherwise) from unlawful intrusion;
provided further, that HSA shall not be responsible for compromises in security
caused directly by the action or inaction of any Charter party. HSA will also
operate and maintain the TACSIS password management system to support such
devices.

         Charter is responsible for the physical security of all network devices
and elements not located in HSA facilities. To the extent Charter wishes HSA to
provide additional layers of NOC support and security for commercial-grade
services (such as LAN firewalls, etc.), HSA reserves the right to negotiate and
charge separately for such support.

         HSA will be responsible for all costs associated with theft of e-mail
addresses or passwords that are not the fault of Charter; provided, that such
liability shall only apply to direct damages and punitive damages related
thereto, and shall not apply to any other consequential or indirect damages.

         Charter and HSA will jointly study and address additional security
concerns such as IP theft/theft of data services, monitoring of excess bandwidth
consumption/service abuse in order to identify and agree upon responsibilities,
methods and procedure to mutually support their respective network elements.

                                      -35-
<PAGE>   36

         O.3      NETWORK MONITORING AND MANAGEMENT

                  O.3.1 HSA's Network Operations Center(s) (NOC) will be staffed
and operational on a 24 x 7 basis. HSA's NOC engineers will constantly monitor
customer and backbone links to identify and respond to outages. HSA's NOC
personnel will be trained to isolate and correct IP connectivity problems and
refer physical/RF outages to appropriate Charter personnel. For complex
problems, senior NOC personnel are available 24 hours a day, 7 days per week.

                  O.3.2 HSA will comply with the following NOC performance
standards:

     o   Network reliability goal of 99.95% with respect to two-way cable modem
         plants, monthly defined as customer minutes up/total customer minutes
         (customer minutes = customers x minutes), effective as of October 1,
         2000.

     o   Any failure impacting all customers will be fixed within 120 minutes
         (mean time to repair).

     o   Any failure impacting more than one System will be fixed within 180
         minutes.

     o   Any failure impacting only one System will be fixed within 240
         minutes.

     o   Any failure impacting part of a system will be fixed within 240
         minutes

                  0.3.3 Charter Advanced Services, Customer Service and
Engineering Teams at the Corporate, Division, Region, Group and System levels
will be notified about any failures, progress reports on failures and expected
repair times as soon as possible but starting no later than:

     o   10 minutes after failure for failures impacting all customers;

     o   20 minutes for failures impacting more than one System; and

     o   30 minutes for failures impacting one System.

         Such notice can be given by HSA to the Charter Teams via e-mail.
Progress reports will continue until failure has been repaired. Charter will
provide the list of Team members and contact information at each level to HSA.
Charter must comply with HSA's System Specifications that can only be modified
in writing and agreed to by the heads of Charter's and HSA's corporate
engineering departments.

         O.4.     NETWORK/SERVICE TICKETING/TROUBLESHOOTING OPERATIONS

         HSA will use a Ticket to record and escalate outages from the NOC to
the proper party (either HSA or Charter personnel identified in the Network
Database) for correction. Tickets may originate from the Tier 1/Tier 2 customer
care interface, HSA's Tier 2 customer care function, the field, or directly from
the NOC.

                                      -36-
<PAGE>   37

                                 ATTACHMENT 1-A

                        TIER 1 -TIER 2 SUPPORT GUIDELINES

         This ATTACHMENT 1-A further delineates the customer support provided by
Charter (Tier 1) and HSA (Tier 2) and identifies the responsible party for that
support. For applications not supported by HSA, Charter's Tier 1 Customer
Support Representatives ("CSRs") should refer the customer to the proper vendor.

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
CUSTOMER ACCOUNT MANAGEMENT                                   CHARTER - TIER I                   HSA - TIER 2
----------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>                                <C>
PRE-QUALIFY RESIDENCE                                         Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
INSTALLATION APPOINTMENT FOR HSA ONLY                         Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
INSTALLATION APPOINTMENT FOR HSA AND CATV                     Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
DISCONNECTION OF HSA SERVICE ONLY                             Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
DISCONNECTION OF HSA AND CATV SERVICE                         Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
SCHEDULING FOR A HOME SERVICE VISIT                           Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
TRANSFER OF SERVICE                                           Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
RELOCATION OF HSA OUTLET WITHIN A RESIDENCE                   Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
VACATION / SEASONAL DISCONNECT                                Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
RESCHEDULE APPOINTMENTS                                       Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
CANCEL APPOINTMENTS                                           Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
ANSWERING CUSTOMER LEDGER / BILLING QUESTIONS                 Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
CABLE MODEM RETURN                                            Tier 1 responsibility              Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
E-MAIL SERVICES/TASKS                                         CHARTER - TIER I                   HSA - TIER 2
----------------------------------------------------------------------------------------------------------------------
<S>                                                    <C>                                       <C>
ADD, DELETE, OR CHANGE "MASTER ACCOUNT"                Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
E-MAIL PASSWORD CHANGES - MASTER ACCOUNT               Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
E-MAIL PASSWORD CHANGES - SUB-ACCOUNTS                 Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
CHANGE E-MAIL SUB-ACCOUNT PASSWORD                     Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
PROBLEMS SENDING/RECEIVING E-MAIL                      Escalate call  to HSA - Tier 2             Troubleshoot &
                                                                                                  resolve customer's
                                                                                                  inability to send
                                                                                                  and/or receive
                                                                                                  e-mail.
----------------------------------------------------------------------------------------------------------------------
ADD, DELETE, OR CHANGE "PRIMARY ACCOUNT"               Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
E-MAIL PASSWORD CHANGES - "PRIMARY ACCOUNT"            Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
E-MAIL PASSWORD CHANGES - "ADDITIONAL E-MAIL           Tier 1, using tools provided by HSA        Refer to Tier I
ACCOUNTS"
----------------------------------------------------------------------------------------------------------------------
CHANGE "ADDITIONAL E-MAIL ACCOUNT" PASSWORD            Tier 1, using tools provided by HSA        Refer to Tier I
----------------------------------------------------------------------------------------------------------------------
PROBLEMS SENDING/RECEIVING E-MAIL FOR ADDITIONAL       Escalate call to HSA - Tier 2              Troubleshoot &
ACCOUNT                                                                                           resolve customer's
                                                                                                  additional account's
                                                                                                  inability to send
                                                                                                  and/or receive
                                                                                                  e-mail
----------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      -37-

<PAGE>   38

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
CONNECTIVITY                                   CHARTER - TIER I                            HSA - TIER 2
----------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                                         <C>
LOSS OF MODEM CONNECTIVITY (I.E., MODEM LED    1.  Check if CATV outage or network         1.  Ensure Tier I support
LIGHTS BLINKING, CYCLING, OR OFF)                  problem to determine status of local        was provided.
                                                   HFC network.                            2.  Troubleshoot & resolve
                                               2.  Verify active account status.               customer's inability to
                                               3.  Check if coaxial cable drop line            connect.
                                                   attached to cable modem.
                                               4.  Use support tool to check if the modem
                                                   MAC address is registered in
                                                   appropriate database.
                                               5.  Have customer power cycle modem; if no
                                                   lights or blinking lights, schedule
                                                   home appointment.
                                               6.  Escalate to HSA - Tier 2 CSC
----------------------------------------------------------------------------------------------------------------------
INTERMITTENT CONNECTIVITY LOSS                 1.  Troubleshoot local network HFC          1.  Ensure Tier I support
                                                   connectivity; schedule field tech           was provided.
                                                   appointment if required. If modem not   2.  Troubleshoot & resolve
                                                   alive, have customer power cycle            customer's intermittent
                                                   modem so status lights are both on          connectivity trouble.
                                                   and steady.
                                               2.  If status lights blinking or
                                                   off, packet loss occurring,
                                                   or modem signal levels
                                                   outside of tolerance range,
                                                   schedule appointment for
                                                   field tech home service
                                                   visit.
                                               3.  If modem alive, check modem signal on
                                                   the support FTP web page (i.e. RX,
                                                   TX, dB)
                                               4.  Escalate to HSA - Tier 2 CSC
----------------------------------------------------------------------------------------------------------------------
STEADY/SOLID (NON-BLINKING LIGHTS) ON MODEM,   Escalate to HSA- Tier 2 CSC                 Troubleshoot & resolve
BUT LOSS OF IP CONNECTIVITY                                                                customer's connectivity
                                                                                           trouble.
----------------------------------------------------------------------------------------------------------------------
HOSTNAME RESOLUTION TO IP ADDRESS              Escalate to HSA- Tier II CSC                Troubleshoot & resolve
                                                                                           customer's connectivity
                                                                                           trouble.
----------------------------------------------------------------------------------------------------------------------
CUSTOMER HOSTNAME NOT MAPPING TO IP ADDRESS    1.  Check customer's account to make sure   Troubleshoot & resolve
                                                   the hostname is registered.             customer's trouble.
                                               2.  Escalate to HSA - Tier 2 CSC
----------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      -38-
<PAGE>   39

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
OTHER                                         CHARTER - TIER I                        HSA - TIER 2
----------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                                         <C>
NIC Device/Driver Problem                     Escalate to HSA - Tier 2 CSC            Troubleshoot & resolve NIC
                                                                                      card trouble.
----------------------------------------------------------------------------------------------------------------------
Browsers                                      Escalate to HSA - Tier I                Troubleshoot & resolve
                                                                                      customer's trouble.  May
                                                                                      require referral to
                                                                                      appropriate vendor.
----------------------------------------------------------------------------------------------------------------------
Supported Operating Systems                   Escalate to HSA Tier 2 - CSC            Troubleshoot & resolve
                                                                                      customer's O/S  trouble.  May
                                                                                      require referral to
                                                                                      appropriate vendor.
----------------------------------------------------------------------------------------------------------------------
Non-supported Operating Systems               Educate customer and refer to           Educate customer and refer to
                                              appropriate vendor.                     appropriate vendor.
----------------------------------------------------------------------------------------------------------------------
MAC O/S Issue                                 Escalate to HSA Tier 2 - CSC            Troubleshoot & resolve
                                                                                      customer's O/S  trouble.  May
                                                                                      require referral to
                                                                                      appropriate vendor.
----------------------------------------------------------------------------------------------------------------------
Personal Home Pages                           Escalate to HSA Tier 2 - CSC
----------------------------------------------------------------------------------------------------------------------
Multiple IP addresses (DHCP)                  1.  Verify proper billing for           Troubleshoot & resolve
                                                  multiple IP's.                      customer's multiple IP address
                                              2.  Escalate to HSA Tier 2 - CSC        issue.
----------------------------------------------------------------------------------------------------------------------
LAN's                                         Refer customer to appropriate vendor    Refer customer to appropriate
                                                                                      vendor
----------------------------------------------------------------------------------------------------------------------
Hubs                                          Refer customer to appropriate vendor    Refer customer to appropriate
                                                                                      vendor
----------------------------------------------------------------------------------------------------------------------
Dial Roaming                                  Escalate to HSA Tier 2 - CSC            Troubleshoot & resolve
                                                                                      customer's multiple IP address
                                                                                      issue.
----------------------------------------------------------------------------------------------------------------------
Online Services & Service Providers                                                   Provide basic troubleshooting.
                                                                                      TCP/IP settings to connect via
                                                                                      the HSA network.
----------------------------------------------------------------------------------------------------------------------
Other Applications                            Educate customer and refer to           Educate customer and refer to
                                              appropriate vendor.                     appropriate vendor.
--------------------------------------------- --------------------------------------- --------------------------------
Gaming                                        Refer customer to Gaming vendor.        Refer customer to Gaming vendor
--------------------------------------------- --------------------------------------- --------------------------------
HSA Policy Questions                          Refer to HSA Service Assurance          Customer Care - Service
                                              department                              Assurance dept. will provide
                                                                                      direction
--------------------------------------------- --------------------------------------- --------------------------------
</TABLE>

                                      -39-
<PAGE>   40

         The parties agree to modify this table as appropriate to incorporate an
icon-based modem "pinging" procedure to be performed by Charter's Tier 1 Help
Desk CSRs following development of such icon/GUI ping command by HSA.

                                      -40-
<PAGE>   41

                                    EXHIBIT 2

                       CHARTER/HSA NETWORK SERVICES MODEL
                       (CHARTER IN-HOUSE SYSTEMS SOLUTION)

                               DEPLOYMENT SERVICES

     2.1          GENERAL

                  2.1.1 At Charter's request, HSA will provide the following
services (the "Deployment Services") on a TTM basis (the "Deployment TTM
Charges") working directly with Charter personnel who will be responsible for
the overall project management, including the coordination with HSA personnel:
engineering planning, site survey, network evaluation and capacity planning,
customer support, CATV network design, data network design, equipment ordering,
delivery and shipping, head-end installation and alpha and beta testing.
Deployment Services are not included in, and are in addition to, the HSA Network
Services Charges and any Miscellaneous TTM Charges.

                  2.1.2 HSA offers Deployment Services on an all-or-nothing
basis (but no a la carte) either prior to or following the commencement of
Committed Network System launch activities:

                  2.1.2.1 Charter may elect to use HSA to perform all of the
Deployment Services in connection with the Launch of a Committed Network System.
If Charter wishes to use HSA, Charter will identify the System and issue an
"Authorization to Proceed" in writing prior to commencement of Launch
activities. The election/Authorization to Proceed cannot be revoked once HSA's
deployment process has begun.

                  2.1.2.2 If HSA is requested to provide Deployment Services
related to Launch activities already commenced by Charter that were not selected
prior to Launch, that request must be in writing and the time will be charged on
a TTM basis. These requests must be approved by Charter regional management and
the Charter Single Point of Contact.

         2.1.3 If HSA is authorized to perform the Deployment Services, HSA will
be responsible for all troubleshooting and on-site technical coordination until
the System is successfully released into revenue.

         2.1.4 Because of the highly sensitive dependencies inherent in the
technical launch of high speed data, if Charter elects NOT to engage HSA to
handle Deployment Services for a particular Committed Network System, then (i)
Charter will issue a waiver of responsibility relieving HSA of any ongoing
responsibility for troubleshooting, delays, or service issues stemming from
activities related to the technical launch, and (ii) HSA will provide Charter
with the written technical specifications necessary for HSA to monitor the
system and perform its HSA Network Services, such information to be provided to
Charter within 5 days of the written request or within 20 days prior to alpha.

                                      -41-
<PAGE>   42

         2.2      SITE SURVEY

                  2.2.1 If selected to render Deployment Services, HSA will
perform an engineering inspection of the head-end/RF plant to obtain the
necessary cable system and local information to properly configure the service
(a "Site Survey"). Information related to the cable plant, the head-end
installations and environmental conditions, the channel line-up, signal source
and delivery, the interconnection of hubs, the connection to HSA's network and
services are collected in the process. The on-site portion of this process
varies substantially with the size of the System under analysis. The outcome of
the process is a detailed document that forms the basis for IP Network Design
and RF Network Design (i.e., a complete "Head-End Record"), plus HSA's
proposals, if any, for any upgrades or changes ("Attainment Measures") that may
be necessary for the Committed Network System to conform to system data
requirements. HSA is not responsible for the completion of any Attainment
Measures. If Charter in its discretion refuses to take the Attainment Measures,
then HSA's Deployment Services will cease and HSA shall be reimbursed its
Deployment TTM Charges to date.

                  2.2.2 All Site Surveys are coordinated by permanent HSA
project planning personnel, and are normally carried out by contractors employed
specifically for this task by HSA. Once the Site Survey is complete, Charter's
Single Point of Contact must approve the final document.

                  2.2.3 If Charter orders/HSA schedules a Site Survey, and upon
arrival the System is not ready for such Site Survey (OTNs not balanced, swept,
etc.), Charter shall pay/reimburse for all TTM costs associated with such
aborted Site Survey, and any rescheduling expense.

         2.3      RF NETWORK DESIGN

                  2.3.1 HSA will apply fundamental RF network strategies to
design (i) the interconnection of the cable modem service to Charter's cable
plant, relying heavily on the completed site survey documentation to identify
the composition of the downstream (towards the home) and upstream (from the home
to the head-end) CATV networks, and (ii) the cable modem head-end system. This
work will be performed by full-time HSA network engineers.

         2.4      IP NETWORK DESIGN

                  2.4.1 HSA applies its overall IP network strategy to the
head-end infrastructure that interconnects the cable modem equipment to HSA's
network and services, and ultimately the end-user to the Internet. The head-end
equipment includes the following components:

         [X]      Backbone and/or regional access routers.

         [X]      Ethernet switches for the interconnection of hubs to the main
                  head-end, and all other network elements.

         [X]      File and computer servers used to implement access control
                  through authentication and authorization, assignment of IP
                  addresses, domain name resolution, the provision of proxy and
                  caching services, and other such tasks.

                                      -42-
<PAGE>   43

         [X]      Remote-access terminal components for management and
                  maintenance.

         [X]      Racks and other hardware, UPS systems, cabling, fiber
                  transceivers, etc.

This work is performed by full-time HSA personnel who are familiar with, and
have been provided with copies of, Charter's local and backbone network
strategies, as well as HSA's practices in providing network services and
connections to the public Internet.

                  2.4.2 HSA has/will develop a standard set of IP Network
Design/operating procedures, including standards related to caching servers. If
Charter does not select HSA Deployment Services, Charter agrees to conform its
IP Network/Equipment designs within the HSA parameters unless a deviation if
approved by HSA's SPOC.

2.5      EQUIPMENT PURCHASE

         2.5.1 HSA is responsible for providing Charter with a complete Bill of
Materials (BOM) as a result of the RF and IP Network Design. Charter will
immediately issue purchase orders to the appropriate vendors and will instruct
these vendors to send the equipment to the designated HSA facility performing
the equipment configuration as described below. It is Charter's responsibility
to inform HSA when the BOM has been processed into Purchase Orders by faxing the
purchase orders and contact information to the HSA location designated to
receive the equipment. It will be Charter's responsibility to track the
equipment purchased and inform HSA's project manager of the expected equipment
arrival date to HSA. If there are any delays as a result of capital approvals or
vendor inventory issues, it is Charter's responsibility to inform HSA of the
delays and a revised launch date will be agreed upon. If Charter decides to
deviate from the BOM provided to them by HSA, either by changing the required
equipment or by not ordering equipment listed on the BOM, a waiver of
responsibility is required from Charter explaining the specific actions taken by
Charter and relieving HSA of all responsibility for delays or lack of equipment
that may adversely affect the technical launch. It will be the responsibility of
Charter to set up a shipping account with a freight company that has been agreed
upon by Charter and HSA so that all shipping charges incurred by Charter
in-house systems, to include equipment and packing slips, can be directly billed
to Charter.

         2.5.2 HSA will provide Charter with a complete Bill of Materials (BOM)
as a result of the RF and IP Network Design. Charter will then immediately issue
a purchase order to the appropriate vendors and will instruct these vendors to
send equipment to the designated HSA facility that will perform the equipment
configuration described below. It is Charter's responsibility to inform HSA when
the BOM is processed and to track the equipment purchase and inform HSA's
project manager of the expected equipment arrival date to HSA. If there are any
delays as a result of capital approvals, vendor inventory issues, etc., it is
Charter's responsibility to inform HSA and a revised launch date will be agreed
upon.

2.6      EQUIPMENT CONFIGURATION AND TESTING

                  2.6.1 HSA personnel will carry out the specific equipment
wiring, configuration, and cabinet installation instructions, and follow
appropriate testing procedures to verify that the equipment to be sent to the
site operates correctly. The process takes place at HSA facilities. Upon receipt
of the equipment from the corresponding vendors, HSA personnel installs it on
the corresponding racks, makes the appropriate power and data connections,
configures the equipment, and performs exhaustive tests to ensure the proper
configuration and operation of all

                                      -43-
<PAGE>   44

the equipment. The fully configured set is then shipped to the appropriate
location for final installation as described in the Site Coordination section
described below.

         2.7      HEAD-END INSTALLATION

         HSA personnel will perform or hire qualified contractors to perform the
following:

                  2.7.1 Installation Procedures. Each on-site installation will
require specific steps and verifications as outlined below.

          1)    Receive and inventory equipment.
                HSA will provide a detailed shipping list of equipment for each
                site. Installation personnel or contractor must reconcile this
                list against received equipment and immediately notify HSA of
                any missing or damaged items.

          2)    Install Racks/Frames
                Shipping company personnel will remove the racks/frames from the
                special shipping crates and assist with physically moving the
                equipment to the final installation location and position.
                Installation personnel or contractor must complete installation
                by securing the rack/frame in a manner consistent with operator
                policy and practices.

          3)    Connect Power and Grounds
                Installation personnel or contractor shall complete all power
                connections including:
                a) connect the UPS to commercial power
                b) connect power management equipment to the UPS
                c) connect all individual equipment to the power management
                   equipment as depicted in installation drawings. Installation
                   personnel or contractor shall complete grounding/bonding of
                   racks to operator grounding system. Ground cable shall be #6
                   or consistent with cable operator requirements, whichever is
                   greater.

          4)    Complete Power Test of All Equipment
                Installation personnel or contractor shall complete powering
                test of all equipment to verify:
                a) operability
                b) control through power management equipment
                c) switch-over to UPS upon loss of commercial power
                d) auto-power-up after loss of total power and subsequent
                   restoration

          5)    Connect Backbone, Dial-Access and POTS Circuits
                Installation personnel or contractor shall complete connection
                and testing of backbone (IP) and dial-access circuits, if any,
                including:
                a) assemble necessary jumpers to reach from telco service
                   backboard to equipment racks
                b) connect circuits to CSU/DSU's and Dial-Access Platforms,
                   if any, as appropriate
                c) after completing physical connections, contact HSAC
                   Deployment Engineering personnel to coordinate and assist
                   with circuit testing
                d) record circuit id numbers and appropriate connections

                                      -44-
<PAGE>   45

          6)    Complete Turn-up and Test of IP Equipment Installation
                contractor shall contact and assist HSAC Deployment Engineering
                to complete turnup and activation of all IP equipment including,
                but not limited to, routers, dial-access platforms, switches,
                servers, and power management consoles.

          7)    Complete Turn-up and Test of CMTS Equipment
                Installation personnel or contractor shall contact and assist
                HSAC Deployment Engineering to complete turnup and activation of
                all CMTS equipment including, but not limited to, cable modem
                termination system (CMTS) and associated up-converter(s).

          8)    Connect Forward/Downstream Signal to Cable Plant
                Installation personnel or contractor shall connect the output
                signal from the CMTS to the downstream combining system of the
                cable plant. Frequency allocation and signal levels shall be set
                according to Cable Operator's direction.

          9)    Connect Cable Return/Upstream Signal to Data Equipment:
                Installation personnel or contractor shall connect cable plant
                upstream returns to the CMTS. Frequency allocation and signal
                levels shall be set according to Cable Operator's direction.

          10)   Complete As-Built Documentation Installation personnel or
                contractor shall complete as-built documentation with all
                connections, modifications, and installation parameters to
                accurately reflect the final installation configuration.
                Documentation shall be delivered to HSA Deployment Engineering
                and the Charter project manager who shall review completed
                head-end installation and as-built documentation and accept
                contracted work as complete

         2.8      MILESTONE MANAGEMENT

         Charter will manage each milestone of the technical deployment to
ensure milestones are accomplished on time and in the proper sequence.

         Prior to commencing any Deployment Services, HSA will review the
estimated cost to perform the above activities based on the Site Survey. If
based on the complexity and size of the System, HSA cost will exceed the amounts
quoted above. HSA will issue in writing revised cost estimates. If Charter
accepts the revised quotes, Charter will issue a purchase order for the
Deployment Services at the revised quotes prior to the commencement of any such
services, except the Site Survey.

                                      -45-
<PAGE>   46
                                   EXHIBIT 3

                       LIST OF COMMITTED NETWORK SYSTEMS

                                CHARTER PIPELINE
                            NETWORK SERVICES SYSTEMS

<TABLE>
<CAPTION>
Division   Region         System           Headend          State   Total Homes
========   ======         ======           =======          =====   ===========
<S>        <C>            <C>              <C>              <C>     <C>
Eastern    Southeast      Simpsonville     Greycourt        SC        73,164
Western    Central        Maryville        Maryville        IL        78,295
Eastern    Mid-Atlantic   Worcester        Chicopee         MA        51,826
Eastern    Mid-Atlantic   Worcester        Worcester        MA       163,289
================================================================================
================================================================================
Western    North Central  Janesville       Mazomaine        WI        26,032
Western    LA             San Luis Obispo  San Luis Obispo  CA        33,496
Western    North Central  Wausau           Stevens Pt       WI        41,012
Western    North Central  Fond du Lac      Sheboygan        WI        29,474
Western    North Central  Fon du Lac       Fon du Lac       WI       100,197
Eastern    SouthEast      Lincolnton       Hickory          NC        23,386
Eastern    Gulf States    Birmingham       Montevallo       AL        22,944
Eastern    Mid-Atlantic   Johnstown        Altoona          PA        51,030
Eastern    SouthEast      Hickory          Hickory          NC        91,068
Eastern    SouthEast      Lenoir           Hickory          NC         6,197
Western    LA             High Desert      Victorville      CA        46,750
Western    North Central  Janesville       Janesville       WI       112,930
Western    North Central  Clintonville     Clintonville     WI        25,282
Eastern    Mid-Atlantic   Parkersburg      Parkersburg      WV        67,589
Eastern    Gulf States    Birmingham       Gardendale       AL        53,029
Eastern    Gulf States    Birmingham       Mtn Brook        AL        31,278
Eastern    SouthEast      Waynesville      Waynesville      NC        20,422
Eastern    Gulf States    St. Tammany      Slidell          LA        64,227

Eastern    SouthEast      Black Mountain   Ashville         NC        10,840
Western    LA             Long Beach       Long Beach       CA       188,102
Eastern    North-East     Pepperell        Worcester        MA        37,763
Eastern    Mid-Atlantic   Charleston       Charleston       WV       102,323
Western    LA             West Sac         Davis            CA        45,119
Eastern    Mid-Atlantic   Beckley          Beckley          WV        52,565
Eastern    Gulf States    Birmingham       Sumiton/Monteval AL        20,389
Eastern    North-East     Belchertown      Chicopee         MA         5,640
Western    LA             Malibu           Long Beach       CA        24,000
Eastern    Gulf States    Birmingham       Jasper           AL        19,894

================================================================================
================================================================================
Eastern    Southeast      Gainesville      Gainesville      GA        42,198
Eastern    Southeast      Athens           Athens           GA        54,082
Eastern    Southeast      Asheville        Asheville        NC        42,115
Eastern    Southeast      Greenville       Spartanburg      SC       217,754
Eastern    Southeast      Gwinnett         Gwinnett         GA        91,200
Eastern    Mid-Atlantic   Johnstown        Johnstown        PA        46,480
Eastern    Mid-Atlantic   Bedford          Bedford          VA        11,829
Eastern    Mid-Atlantic   Radford          Radford          VA        11,913
Eastern    Mid-Atlantic   Charleston       Milton           WV        12,500
Eastern    Mid-Atlantic   Uniontown        Uniontown        PA        50,850
Eastern    Mid-Atlantic   Point Pleasant   Point Pleasant   WV        18,090
Eastern    Mid-Atlantic   Oak Hill         Oak Hill         WV        10,050
Eastern    Southeast      Boone            Boone            NC        33,793
Eastern    Southeast      Simpsonville     Anderson         SC        28,563

================================================================================
                                                                   2,390,969
</TABLE>
<PAGE>   47
                                   EXHIBIT 4

            FORM OF AMENDED AND RESTATED SECURITIES PURCHASE WARRANT

                                  See attached

                                      -47-<PAGE>   1
                                                                    EXHIBIT 10.2

                              AMENDED AND RESTATED
                           SECURITIES PURCHASE WARRANT

                   TO SUBSCRIBE FOR AND PURCHASE COMMON STOCK
                                       OF
                             HIGH SPEED ACCESS CORP.

         This AMENDED AND RESTATED SECURITIES PURCHASE WARRANT (this "Warrant")
is dated as of this 12th day of May, 2000, by and among:

         HIGH SPEED ACCESS CORP.
         4100 E. Mississippi Avenue, Suite 1150
         Denver, Colorado 80246                         ("HSA" or the "Company")

               And

         CHARTER COMMUNICATIONS, INC.
         12444 Powerscourt Drive, Suite 400
         St. Louis, Missouri 63131                      ("Charter")

               And

         CHARTER COMMUNICATIONS
          HOLDING COMPANY, LLC
         12444 Powerscourt Drive, Suite 400
         St. Louis, Missouri 63131                      ("Charter HoldCo")

                                    RECITALS

                  WHEREAS, HSA, pursuant to Class A Securities Purchase Warrant
No. R-001, dated November 25, 1998 (the "Original Class A Warrant"), granted
Vulcan Ventures, Incorporated ("Vulcan") the right to purchase up to Three
Million Eight Hundred Seventy Five Thousand (3,875,000) fully paid,
nonassessable shares of Common Stock of HSA, subject to adjustment, under terms
and conditions as more fully explained therein.

                  WHEREAS, HSA, pursuant to Class B Securities Purchase Warrant
No. R-001, dated November 25, 1998 (the "Original Class B Warrant" and, together
with the Original Class A Warrant, the "Original Warrants"), granted Vulcan the
right to purchase up to Three Million Eight Hundred Seventy Five Thousand
(3,875,000) fully paid, nonassessable shares of Common Stock of HSA, subject to
adjustment, under terms and conditions as more fully explained therein.

                  WHEREAS, by Assignment, dated April 23, 1999, Vulcan
transferred all of its right, title and interest in and to the Original Warrants
to Charter Investment, Inc., a Delaware corporation (formerly known as Charter
Communications, Inc.) ("CII").

<PAGE>   2

                  WHEREAS, HSA and CII amended certain provisions of the
Original Warrants pursuant to two separate Amendments, each dated as of April
29, 1999.

                  WHEREAS, by Assignment, dated November 8, 1999, CII
transferred all of its right, title and interest in and to the Original Warrants
to its Affiliate, Charter HoldCo.

                  WHEREAS, HSA, Charter and Charter HoldCo desire to further
amend certain provisions of the Original Warrants as set out herein, and to
combine and restate the Original Warrants in their entirety into this Warrant,
which shall be granted in favor of Charter and subject to assignment by Charter
to any Affiliate, including, without limitation, Charter HoldCo.

                  NOW, THEREFORE, in consideration of the promises and mutual
covenants and agreements set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, and
intending to be legally bound hereby, the parties agree to amend and restate the
Original Warrants as follows:

                     [THIS SPACE INTENTIONALLY LEFT BLANK.]

                                       2
<PAGE>   3

THIS WARRANT REPRESENTED BY THIS CERTIFICATE AND THE SECURITIES ISSUABLE UPON
EXERCISE HEREOF HAVE BEEN ACQUIRED IN A TRANSACTION NOT INVOLVING ANY PUBLIC
OFFERING AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "1933 ACT"), OR THE SECURITIES LAWS OF ANY STATE. NEITHER THIS
WARRANT NOR SUCH SECURITIES MAY BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH
REGISTRATION UNLESS PURSUANT TO AN EXEMPTION THEREFROM UNDER SUCH ACT AND THE
SECURITIES LAWS OF ANY APPLICABLE STATE, THE PROVISIONS OF THIS WARRANT, OR THE
RECEIPT BY THE ISSUER OF AN OPINION OF COUNSEL, WHICH SHALL BE REASONABLY
SATISFACTORY TO THE ISSUER, TO THE EFFECT THAT SUCH TRANSFER IS EXEMPT FROM
REGISTRATION UNDER THE ACT AND SUCH STATE SECURITIES LAWS.

                  Void if Not Exercised during the Applicable Exercise Period
Described Herein

Amended and Restated Warrant No. R-001

         1. GRANT OF WARRANT; CONDITIONAL EXERCISE. THIS CERTIFIES that, for
value received, the Holder is entitled, subject to the terms and conditions
hereinafter set forth, to earn on or prior to the applicable Effective Date, and
to purchase from HSA during the applicable Exercise Period, up to Twelve Million
(12,000,000), fully paid, nonassessable shares of Common Stock, $0.01 par value,
of the Company, as adjusted from time to time as provided herein (the "Maximum
Number of Warrant Shares") at the Exercise Price. The aggregate Exercise Price
of this Warrant shall be an aggregate amount not to exceed Thirty Eight Million
Seven Hundred Sixty Thousand Dollars ($38,760,000). Certain of the Warrant
Shares (the "First Warrant Shares") shall be issuable pursuant to the terms and
conditions of, and shall be qualified by and subject to, Section 6 of the
Systems Access Agreement and certain provisions of the First Network Services
Agreement, which are incorporated herein by reference, and certain other Warrant
Shares (the "Second Warrant Shares") shall be issuable pursuant to the terms and
conditions of, and shall be qualified by and subject to, Section 6 of the Second
Network Services Agreement, which is incorporated herein by reference. The
number of Warrant Shares to be received upon exercise of this Warrant and the
price to be paid for each such Warrant Share may be adjusted from time to time
as hereinafter set forth. This Warrant may not be exercised unless accompanied
by a signed Subscription Form in the form attached hereto as Exhibit A.

         2. DEFINITIONS. Unless otherwise defined herein, as used in this
Warrant, the following terms shall have the meanings ascribed to them as
follows:

                  (a) "Additional Committed Network Systems" shall have the
meaning given it in Section 1.1 of the Second Network Services Agreement.

                  (b) "Affiliate" means, with respect to the Holder, any Person
directly or indirectly controlling, controlled by, or under common control with
the Holder, including, without limitation, Charter HoldCo.

                                       3
<PAGE>   4

                  (c) "ATP" has the meaning set forth in Section 2.3 of the
Second Network Services Agreement.

                  (d) "Cable System" shall have the meaning given it in Section
1.2 of the Systems Access Agreement.

                  (e) "Certificate Register" has the meaning set forth in
Section 16 hereof.

                  (f) "Charter" shall mean Charter Communications, Inc., a
Delaware corporation, or such successor company as may result from any merger or
other business combination or reorganization of Charter Communications, Inc.

                  (g) "Charter HoldCo" shall mean Charter Communications Holding
Company, LLC, a Delaware limited liability company, or such successor company as
may result from any merger or other business combination or reorganization of
Charter Communications Holding Company, LLC.

                  (h) "Common Stock" means the shares of common stock of $0.01
par value that the Company is authorized to issue in accordance with its Amended
and Restated Certificate of Incorporation and all securities into which such
Common Stock is exchanged or converted.

                  (i) "Company" means HSA, or such successor company as may
result from any merger or other business combination or reorganization of HSA.

                  (j) "Current Market Price" shall have the meaning set forth in
Section 3(d) hereof.

                  (k) "Effective Date" means, collectively, the First Effective
Date and the Second Effective Date.

                  (l) "Exercise Date" shall have the meaning set forth in
Section 3(d) hereof.

                  (m) "Exercise Period" means, collectively, the First Exercise
Period and the Second Exercise Period.

                  (n) "Exercise Price" means $3.23 per Warrant Share (adjusted,
if appropriate, pursuant to Section 6 hereof).

                  (o) "First Committed Network Systems" shall have the meaning
given "Committed Network Systems" in Section 1.4 of the First Network Services
Agreement.

                  (p) "First Effective Date" means the date any First Warrant
Share becomes automatically issuable in accordance with the provisions hereof
and the Systems Access Agreement and which shall in no event be later than July
31, 2003, unless extended pursuant to Section 6.4 of the Systems Access
Agreement.

                  (q) "First Exercise Period" means, with respect to any First
Warrant Share, the period beginning on November 25, 1998 and ending on May 25,
2006.

                                       4
<PAGE>   5

                  (r) "First HSA Services" has the meaning of "HSAC Services"
set forth in Section 1.14 of the First Network Services Agreement.

                  (s) "First Network Services Agreement" means the Network
Services Agreement, dated November 25, 1998, by and between the Company and
Charter HoldCo.

                  (t) "First Warrant Shares" has the meaning set forth in
Section 1 hereof.

                  (u) "Holder" means Charter, or any other Person to whom this
Warrant is transferred in accordance with Section 5 hereof, including, without
limitation, Charter HoldCo.

                  (v) "Homes Passed" shall have the meaning given it in Section
1.14 of the Systems Access Agreement.

                  (w) "HSA" shall mean High Speed Access Corp., a Delaware
corporation.

                  (x) "Maximum Number of Warrant Shares" has the meaning set
forth in Section 1 hereof, as may be increased from time to time pursuant to
Section 3(c) hereof, and as may be adjusted, if appropriate, pursuant to Section
6 hereof.

                  (y) "Net Issue Exercise" shall have the meaning set forth in
Section 3(d) hereof.

                  (z) "Office" means the Company's office at 4100 E. Mississippi
Avenue, Suite 1150, Denver, Colorado 80246, or such other office as the Company
may designate by written notice to the Holder.

                  (aa) "Operators" means Charter, Charter HoldCo and their
direct and indirect subsidiaries.

                  (bb) "Person" means any person, firm, company, or other
entity.

                  (cc) "Registration Rights Agreement" means the Registration
Rights Agreement, dated the date hereof, by and between the Company, Charter and
Charter HoldCo.

                  (dd) "Second Committed Network Systems" shall have the meaning
given "Committed Network Systems" in Section 1.7 of the Second Network Services
Agreement.

                  (ee) "Second Effective Date" means the date any Second Warrant
Share becomes automatically issuable in accordance with the provisions hereof.

                  (ff) "Second Exercise Period" means, with respect to any
Second Warrant Share, the period beginning on the Second Effective Date and
ending on the seven and one-half (7 1/2) year anniversary of the Second
Effective Date.

                  (gg) "Second HSA Services" has the meaning of "HSA Network
Services" set forth in Section 1.12 of the Second Network Services Agreement.

                                       5
<PAGE>   6

                  (hh) "Second Network Services Agreement" means the Network
Services Agreement dated May 12, 2000, by and between the Company and Charter.

                  (ii) "Second Warrant Shares" has the meaning set forth in
Section 1 hereof.

                  (jj) "Secretary" means John G. Hundley or his duly elected and
qualified successor as the Company's Secretary, or any duly elected and
qualified Assistant Secretary of the Company.

                  (kk) "Securities Act" means the Securities Act of 1933, as
amended, and any successor thereto, as the same shall be in effect from time to
time.

                  (ll) "Securities Laws" means the Securities Act of 1933, as
amended, or the securities laws of any state, or any similar successor federal
or state statutes and rules and regulations thereunder, all as the same shall be
in effect from time to time.

                  (mm) "Stock Certificate" means an appropriate certificate
issued in the Holder's name representing the Subscribed Shares.

                  (nn) "Stock Receipt" means a written receipt, deliverable by
the Company to the Holder pursuant to Section 4 hereof, (a) acknowledging the
Company's receipt of the Exercise Price and the Holder's timely and proper
exercise of this Warrant, and (b) obligating the Company to issue a Stock
Certificate to the Holder within 30 working days after this Warrant's surrender
to the Company.

                  (oo) "Subscribed Shares" means, collectively, the number of
whole Warrant Shares that the Holder designates on the Subscription Form as
Warrant Shares that the Holder wishes to purchase upon this Warrant's surrender
to the Company, which shall not exceed the Maximum Number of Warrant Shares.

                  (pp) "Subscription Form" means the subscription form attached
as Exhibit A to this Warrant.

                  (qq) "Systems Access Agreement" means the Systems Access and
Investment Agreement, dated November 25, 1998, by and among the Company, Vulcan
Ventures, Incorporated and Charter HoldCo.

                  (rr) "Third Party Accounting Firm" has the meaning set forth
in Section 3(d) hereof.

                  (ss) "Total Consideration" has the meaning set forth in
Section 6(a)(i)(1) hereof.

                  (tt) "Transfer Form" means the transfer form attached as
Exhibit B to this Warrant.

                                       6
<PAGE>   7

                  (uu) "Warrant" means, as the context requires, this Amended
and Restated Securities Purchase Warrant, or the number of Subscribed/Warrant
Shares issued or issuable under this Amended and Restated Securities Purchase
Warrant.

                  (vv) "Warrant Period" means the period beginning on November
25, 1998 and ending on the last date of the last Exercise Period.

                  (ww) "Warrant Receipt" means a written receipt delivered by
the Holder to the Company and agreed to and accepted by the Company pursuant to
Section 3(d) hereof, indicating as of the date thereof, on a cumulative basis,
(a) the First Committed Network Systems and/or Second Committed Network Systems
and the date on which they became First Committed Network Systems and/or Second
Committed Network Systems, (b) the total number of Homes Passed in all First
Committed Network Systems, Second Committed Network Systems and/or Additional
Committed Network Systems, (c) the number of Warrants earned and, with respect
to such earned Warrants exercisable for Second Warrant Shares, the applicable
Second Effective Date, and (d) the number of First Warrant Shares and/or Second
Warrant Shares issuable upon exercise of such earned Warrants.

                  (xx) "Warrant Shares" means, collectively, the First Warrant
Shares and the Second Warrant Shares that this Warrant entitles the Holder to
subscribe for and receive upon the Holder's exercise of this Warrant in
accordance with Section 3 hereof, or, as appropriate if the context requires,
these same shares of Common Stock as they may be issued and outstanding in the
hands of the Holder after exercise of this Warrant.

         3. EXERCISE OF WARRANT.

                  (a) Second Warrant Shares. This Warrant entitles the Holder to
earn, from time-to-time and upon the terms and conditions set forth in this
Warrant, as of the Second Effective Date, and purchase during the Second
Exercise Period, Subscribed Shares in any amount equal to the number of Homes
Passed in Second Committed Network Systems and Additional Committed Network
Systems on either:

                           (1) a .775 Second Warrant Share per every Home Passed
         basis, up to an aggregate of Five Million (5,000,000) Homes Passed
         under the Second Network Services Agreement, without reference to Homes
         Passed under the First Network Services Agreement; or

                           (2) a 1.55 Second Warrant Share per every Home Passed
         basis, for additional Homes Passed in excess of Five Million
         (5,000,000) under the Second Network Services Agreement, without
         reference to Homes Passed under the First Network Services Agreement;

in each case in accordance with the Second Network Services Agreement; provided,
however, that Subscribed Shares earned under this Section 3(a) shall not vest
(i.e., be deemed issued to the Holder or eligible for exercise) until such time
as the applicable Home Passed is or becomes part of a Second Committed Network
System under Section 2 of the Second Network Services Agreement; and provided
further, that this Warrant may only be exercised with respect to Subscribed
Shares under this Section 3(a) to the extent of Homes Passed that are released
to

                                       7
<PAGE>   8

HSA under Section 2.3 of the Second Network Services Agreement for Second HSA
Services under an ATP.

                  (b) First Warrant Shares. This Warrant entitles the Holder to
earn, from time-to-time and upon the terms and conditions set forth in this
Warrant, but in no event later than the First Effective Date, and purchase
during the First Exercise Period, Subscribed Shares in any amount equal to the
number of Homes Passed in excess of Seven Hundred Fifty Thousand (750,000) in
First Committed Systems on a 1.55 First Warrant Share per every Home Passed
basis, for Homes Passed under the First Network Services Agreement, without
reference to Homes Passed under the Second Network Services Agreement, in
accordance with the Systems Access Agreement and the First Network Services
Agreement; provided, however, that:

                           (1) the number of Subscribed Shares issuable under
         this Warrant (to the extent of the number of Homes Passed in a First
         Committed Network System, on a 1.55 First Warrant Share per Home Passed
         basis), will be cancelled and deemed forfeited by the Holder in the
         event the Operator withdraws such First Committed Network System under
         the First Network Services Agreement for any reason other than pursuant
         to Sections 18.1, 18.2, 18.3 and/or 18.6 of such First Network Services
         Agreement, except to the extent the Holder or such Operator replaces
         the Homes Passed in such withdrawn First Committed Network System with
         Homes Passed in another First Committed Network System or additional
         First Committed Network Systems; provided further, that Subscribed
         Shares issuable under this Warrant will not be cancelled or deemed
         forfeited if the Operator terminates any of HSA's exclusive rights to
         provision First HSA Services in any First Committed Network Systems as
         provided for or permitted under the Systems Access Agreement or the
         First Network Services Agreement; and

                           (2) the inspection and commissioning procedures set
         forth in Section 2.3 of the First Network Services Agreement have been
         satisfied.

                  (c) Maximum Number of Warrant Shares. At no time may the
number of Warrant Shares earned pursuant to Sections 3(a) and 3(b) hereof
exceed, in the aggregate, the Maximum Number of Warrant Shares. If the number of
Warrant Shares earned pursuant to Section 3(a) and 3(b) hereof are within Five
Hundred Thousand (500,000) Warrant Shares of reaching the Maximum Number of
Warrant Shares, the Holder, at its option, may require that the Company amend
this Warrant to increase the Maximum Number of Warrant Shares to allow the
Holder to earn more Warrant Shares for commitments of Homes Passed pursuant to
Section 3(a) and 3(b) hereof. The Company hereby undertakes to seek shareholder
approval, if necessary, to amend this Warrant to increase the Maximum Number of
Warrant Shares. If the Company fails to amend this Warrant to increase the
Maximum Number of Warrant Shares at the Holder's request, the Holder will have
no obligation to commit any additional Homes Passed under the Systems Access
Agreement and the First Network Services Agreement, or under the Second Network
Services Agreement, beyond those already committed.

                  (d) Warrant Receipt. As of June 30, 2000, and continuing on a
quarterly basis thereafter, the Holder shall deliver the Warrant Receipt to the
Company. If the Company objects to the Warrant Receipt so delivered by the
Holder, the Company must notify the Holder in writing within fifteen (15) days
following receipt thereof, setting forth in specific detail the basis

                                       8
<PAGE>   9

for the Company's objection and the Company's proposal for any adjustments to
the Warrant Receipt. The Holder and the Company shall seek in good faith to
reach agreement within thirty (30) days following the Holder's receipt of the
Company's written notice of objection. If the Holder and the Company are unable
to reach agreement within such time period, then a "Big-5" accounting firm, as
agreed upon by the Holder and the Company (the "Third Party Accounting Firm"),
shall be engaged to review the Warrant Receipt and shall make a determination
that represents either agreement with the Holder or with the Company, or a
compromise between such positions. The determination of the Third Party
Accounting Firm shall be delivered as soon as practicable following the
engagement of the Third Party Accounting Firm, and shall be final, conclusive
and binding upon the Holder and the Company. The non-prevailing party shall pay
the fees and expenses of the Third Party Accounting Firm. If the Company does
not object to the Warrant Receipt within fifteen (15) days of receipt, the
Warrant Receipt shall be deemed agreed to and accepted by HSA.

                  (e) Reconciliation. As of May 12, 2005, the parties shall
effect a reconciliation of the total number of Homes Passed in all First
Committed Network Systems under the First Network Services Agreement, the total
number of Homes Passed in all Second Committed Network Systems and Additional
Committed Network Systems under the Second Network Services Agreement, the
number of outstanding Warrants and the number of Warrant Shares theretofore
issued upon exercise of this Warrant. If the parties cannot agree on a
reconciliation, then the Third Party Accounting Firm shall be engaged to resolve
any dispute, as set forth in Section 3(d) hereof.

                           (1) If such reconciliation reveals that the total
         number of Homes Passed in all First Committed Systems under the First
         Network Services Agreement (after adding back in Homes Passed in First
         Committed Network Systems and additional First Committed Network
         Systems withdrawn from the First Network Services Agreement pursuant to
         Sections 18.1, 18.2, 18.3 and/or 18.6 thereof), is different than the
         total number of all outstanding Warrants representing First Warrant
         Shares, then the number of Warrants representing First Warrant Shares
         will be adjusted upward or downward, as the case may be. If the number
         of unexercised Warrants representing First Warrant Shares then held by
         the Holder is insufficient to cover any adjustment downward, then the
         Holder shall return to HSA a number of First Warrant Shares necessary
         to meet such shortfall, and HSA shall refund to the Holder the Exercise
         Price paid by the Holder for such returned First Warrant Shares.

                           (2) If such reconciliation reveals that the total
         number of Homes Passed in all Second Committed Network Systems and
         Additional Committed Network Systems under the Second Network Services
         Agreement (after adding back in Homes Passed in all Second Committed
         Network Systems and Additional Committed Network Systems (i) withdrawn
         by the Operator from the Second Network Services Agreement pursuant to
         Section 13.3 thereof, or (ii) otherwise withdrawn by the Operator but
         for which a Termination Fee has been paid pursuant to Section 13.5
         thereof) is different that the total number of all outstanding Warrants
         representing Second Warrant Shares, then the number of Warrants
         representing Second Warrant Shares will be adjusted upward or downward,
         as the case may be. If the number of unexercised Warrants representing
         Second Warrant Shares then held by the Holder is insufficient to cover
         any adjustment

                                       9
<PAGE>   10

         downward, then the Holder shall return to HSA a number of Second
         Warrant Shares necessary to meet such shortfall, and HSA shall refund
         to the Holder the Exercise Price paid by the Holder for such returned
         Second Warrant Shares.

                  (f) Procedures. To exercise this Warrant, an authorized
officer of the Holder shall, during the applicable Exercise Period, on the day
the Holder wishes to exercise this Warrant (the "Exercise Date"):

                           (1) Complete and certify the Subscription Form by
         designating the number of Subscribed Shares to which the Holder is
         entitled to exercise and wishes to exercise pursuant to such
         Subscription Form and Section 1 hereof (which may be less than or equal
         to the Maximum Number of Warrant Shares);

                           (2) Surrender this Warrant to the Secretary at the
         Company's Office, and

                           (3) Upon the surrender of this Warrant to the
         Secretary, deliver to the Secretary at the Company's Office a certified
         or cashier's check payable to the Company's order in an amount equal to
         (i) the number of Subscribed Shares, times (ii) the Exercise Price.

The Holder may, at its option, in lieu of tendering a certified or cashier's
check as provided in subparagraph (3) above, exercise this Warrant by
submitting, during normal business hours, a duly executed exercise notice marked
to reflect "Net Issue Exercise," and specifying the number of Warrant Shares to
be exercised. Upon a Net Issue Exercise, the Holder shall be entitled to receive
Warrant Shares equal to the value of this Warrant (or the portion thereof being
exercised by Net Issue Exercise) by surrender of this Warrant to the Company
together with notice of such election, in which event the Company shall issue to
the Holder a number of Warrant Shares computed as of the date of surrender of
this Warrant to the Company using the following formula:

                              X = Y x (A-B)
                              -------------
                                    A

         Where X = the number of Warrant Shares to be issued to Holder;

                  Y    =   the number of Warrant Shares purchasable under this
                           Warrant (at the date of such calculation).

                  A    =   the Current Market Price of one share of the
                           Company's Common Stock (at the date of such
                           calculation);

                  B    =   the Exercise Price (as adjusted to the date of such
                           calculation).

As used above, "Current Market Price" means, if the Company's Common Stock is
traded on a national securities exchange, the NASDAQ National Market System or
the over-the-counter market, (i) the average of the last reported price over the
five (5) trading days immediately preceding the date of valuation at which the
Common Stock has traded on such national

                                       10
<PAGE>   11

securities exchange or the NASDAQ National Market System, or (ii) the average of
the bid and asked prices on the over-the-counter market on the date of
valuation. If the Common Stock is not regularly traded in any market, the
Current Market Price shall be mutually determined by the Board of Directors of
the Company and by the Holder, such determination to be made in good faith and
with due care.

                  (g) Warrant Shares Exercised. If the Subscription Form is
otherwise silent, the Warrant Shares with the earliest Exercise Period
expiration dates shall be deemed the Subscribed Shares that are the subject of
the exercise.

                  (h) Holder of Record. Notwithstanding any delay in the actual
issuance of a Stock Certificate or Stock Receipt pursuant to Section 4 hereof,
the Warrant Shares shall be deemed issued for all purposes as of the opening of
business on the Exercise Date, and the Holder shall for all purposes be deemed
to be the holder of record of the Subscribed Shares to which the Stock Receipt
or the Stock Certificate pertains.

         4. ISSUANCE OF CERTIFICATE FOR SUBSCRIBED SHARES. Upon the Holder's
exercise of this Warrant in accordance with Section 3 hereof, the Company shall
deliver to the Holder:

                  (a) If the Subscribed Shares constitutes the Maximum Number of
Warrant Shares (and as the Company chooses), either (1) a Stock Certificate, or
(2) a Stock Receipt.

                  (b) If the Subscribed Shares constitute less than the Maximum
Number of Warrant Shares (and as the Company chooses), either

                           (1) a Stock Certificate, together with a new Amended
         and Restated Securities Purchase Warrant, containing the same terms and
         conditions as this Warrant, evidencing the Holder's continued right to
         subscribe (during the applicable Exercise Period) for the remainder of
         the Maximum Number of Warrant Shares; or

                           (2) a Stock Receipt, together with a new Amended and
         Restated Securities Purchase Warrant, containing the same terms and
         conditions as this Warrant, evidencing the Holder's continued right to
         subscribe (during the applicable Exercise Period) for the remainder of
         the Maximum Number of Warrant Shares.

         5. TRANSFER OF WARRANT.

                  (a) This Warrant shall be registered on the books of the
Company, which shall be kept at its Office for that purpose, and shall be
transferable in whole or in part, but only on such books, by the Holder (or the
Holder's duly authorized representative) by completing the Transfer Form, and
only in compliance with paragraph (b) below and Section 7 hereof. The Company
may issue appropriate stop orders to its Secretary or transfer agent to prevent
a transfer in violation of this Section 5 and Section 7 hereof.

                  (b) The Holder may transfer this Warrant to any Person or
Persons at any time during the Warrant Period by completing and signing the
Transfer Form; provided, however, that without the prior written consent of the
Company, this Warrant and all rights hereunder may be transferred only (i) to an
Affiliate, or (ii) in accordance with the requirements of Section 7

                                       11
<PAGE>   12

hereof. If at least fifteen (15) working days before the end of the applicable
Exercise Period the Holder completes and signs the Transfer Form and surrenders
this Warrant to the Secretary at the Company's Office, the Company shall, within
ten (10) working days after this Warrant's surrender, issue to the transferee or
transferees identified on the completed Transfer Form one or more new Securities
Purchase Warrants (containing the same terms and conditions as this Warrant)
evidencing the transferee's or transferees' right or rights to subscribe (during
the applicable Exercise Period) for all or part of the Warrant Shares.

         6. ANTI-DILUTION.

                  (a) The number of Warrant Shares and the Exercise Price for
any Subscribed Shares shall be adjusted during the applicable Exercise Period,
but before the Holder's exercise of this Warrant, in the following
circumstances:

                           (1) Issues of Shares. If the Company shall issue any
         of its Common Stock for a consideration per share which is less than
         the Exercise Price in effect immediately prior to such issuance (other
         than shares issued to employees, officers, directors or consultants of
         the Company pursuant to option plans approved by the Board of Directors
         of the Company), the Exercise Price shall be reduced to such lower
         price. For purposes of this subparagraph (i), the following clauses
         shall also be applicable:

                           (i) Convertible Securities, Options and Rights. If at
         any time the Company shall issue or sell any rights, options, warrants
         or other securities entitling the holders thereof to purchase Common
         Stock or convert such securities into Common Stock at a price per share
         (determined by dividing (A) the total amount, if any, received or
         receivable by the Company in consideration of the issuance or sale of
         such rights, options, warrants or other securities plus the total
         amount if any, payable to the Company upon exercise or conversion
         thereof (the "Total Consideration") by (B) the number of additional
         shares of Common Stock issuable upon exercise or conversion of such
         securities) which is less than the Exercise Price in effect on the date
         of such issuance or sale, the Exercise Price shall be adjusted as of
         the date of such issuance or sale so that the same shall equal the
         price determined by dividing (A) the sum of (x) the number of shares of
         Common Stock outstanding on the date of such issuance or sale
         multiplied by the Exercise Price in effect immediately prior thereto
         plus (y) the Total Consideration, by (B) the number of shares of Common
         Stock outstanding on the date of such issuance or sale plus the maximum
         number of additional shares of Common Stock issuable upon exercise or
         conversion of such securities. Simultaneously with all adjustments to
         the number and/or kind of securities, property and cash to be issued in
         connection with any such issuance, sale or conversion, the Exercise
         Price will also be appropriately adjusted so that at all times the
         Holder hereof will not pay more than the aggregate purchase price to
         exercise this Warrant in full immediately after such adjustment as such
         Holder had to pay immediately prior to such adjustment.

                           (ii) Distributions, Share Dividends and Splits.

                                (A) In case the Company declares a dividend or
                           other distribution payable in Common Stock or
                           subdivides its Common Stock

                                       12
<PAGE>   13

                           into a greater number of shares of Common Stock, the
                           Exercise Price in effect immediately prior to such
                           declaration or subdivision shall be proportionately
                           decreased and the number and kind of Warrant Shares
                           purchasable upon exercise of this Warrant shall be
                           adjusted so that the Holders thereof shall be
                           entitled to receive the kind and number of Warrant
                           Shares or the other securities of the Company (such
                           other securities thereafter enjoying the rights of
                           Warrant Shares) that the Holder would have owned or
                           have been entitled to receive after the happening of
                           any of the events described in this paragraph (2) had
                           the Warrant Shares been issued immediately prior to
                           the happening of such event or any record date with
                           respect thereto.

                                (B) In case the Company shall distribute to the
                           holders of Common Stock (x) securities, (y) property,
                           other than cash, or (z) cash, in each case, without
                           fair payment therefor, then, and in each such case,
                           the Holder, upon exercise hereof, shall be entitled
                           to receive such securities, property and cash which
                           such Holder would have received had such Holder been
                           the holder of record of the Common Stock, subject,
                           however, to such Holder agreeing to any conditions to
                           such distribution as were required of all other
                           holders of Common Stock in connection with such
                           distribution.

                                (C) If the securities to be distributed by the
                           Company to persons other than Holders of this Warrant
                           involve rights, warrants, options, or any other form
                           of convertible securities, and the right to exercise
                           or convert such securities would expire in accordance
                           with its terms prior to the exercise of this Warrant,
                           and without the exchange of any such rights, warrants
                           or options, then the terms of such securities shall
                           provide that such exercise or convertibility shall
                           remain in effect until thirty (30) days after the
                           date the Holder of this Warrant becomes a holder of
                           Common Stock pursuant to the exercise thereof.

                                (D) An adjustment made pursuant to this
                           paragraph (2) shall become effective (x) immediately
                           after the record date in the case of a dividend or
                           distribution, and (y) immediately after the effective
                           date in the case of a subdivision, combination or
                           issuance. If, as a result of an adjustment made
                           pursuant to this paragraph (2), the Holder after
                           exercise shall become entitled to receive shares of
                           two or more classes of capital or Common Stock and
                           any other class of capital stock of the Company, the
                           Board of Directors of the Company (whose
                           determination shall be conclusive and shall be
                           described in a written notice to the Holder promptly
                           after such adjustment) shall determine the allocation
                           of the adjusted Exercise Price between or among
                           shares of such classes of capital stock or Common
                           Stock and such other classes of capital stock.

                           (iii) Consideration. In case the Company shall issue
         its Common Stock for a consideration wholly or partly other than cash,
         the amount of the consideration other

                                       13
<PAGE>   14

         than cash received by the Company shall be deemed to be the lesser of
         (i) the fair market value on the issue date of the Common Stock so
         issued by the Company, as determined in good faith by the Board of
         Directors of the Company, less any cash consideration, or (ii) the
         fair market value of such consideration as determined in good faith by
         the Board of Directors of the Company.

                           (iv) Record Dates. In case the Company shall take a
         record of the holders of its Common Stock for the purpose of
         determining if the Holder is entitled (i) to receive a dividend or
         other distribution payable in Common Stock, or (ii) to subscribe for or
         purchase Common Stock, then such record date shall be deemed to be the
         date of the issue or sale of the Common Stock issued upon the
         declaration of such dividend or the making of such distribution or
         deemed to have been issued upon the granting of such right of
         subscription or purchase, as the case may be.

                           (v) Treasury Stock. The number of shares of Common
         Stock outstanding at any given time shall not include shares owned or
         held by or for the account of the Company in its treasury, and the
         disposition of any such shares so owned or held shall be considered an
         issue of Common Stock.

                           (vi) Minimum Exercise Price. In no case shall the
         Exercise Price be less than $0.01 per share.

                           (2) Stock Combinations. In case the Company shall
         combine all of the outstanding Common Stock into a smaller number of
         shares, the Exercise Price in effect immediately prior to such
         combination shall be proportionately increased.

                           (3) Reorganizations. If any capital reorganization or
         reclassification of the capital stock of the Company (other than a
         combination or merger or sale of assets transaction that does not
         result in any reclassification or change of the outstanding shares of
         Common Stock) shall be effected, then, as a condition of such
         reorganization, reclassification, consolidation, merger or sale, lawful
         and adequate provision shall be made whereby the Holder shall
         thereafter have the right to receive upon exercise of this Warrant such
         shares of stock, securities or assets as may be issued or payable with
         respect to or in exchange for a number of outstanding shares of Common
         Stock equal to the number of shares of Common Stock immediately
         theretofore issuable upon exercise of this Warrant had such
         reclassification, consolidation, merger or sale not taken place; and in
         any such case, appropriate provisions shall be made with respect to the
         rights and interests of the Holder to the end that the provisions
         hereof (including without limitation provisions for adjustment of the
         Exercise Price and of the number of Warrant Shares) shall thereafter be
         applicable, as nearly as may be, in relation to any shares of stock,
         securities or assets thereafter deliverable upon the exercise hereof.
         The Company shall not effect any such consolidation, merger or sale
         unless, prior to or simultaneously with the consummation thereof, the
         successor company (if other than the Company) resulting from such
         consolidation or merger or the company purchasing such assets shall
         assume by a written instrument executed and mailed by registered mail,
         postage prepaid, or delivered to each registered Holder at the last
         address of such Holder appearing on the Certificate Register, the
         obligation of such company to deliver to the Holder such shares

                                       14
<PAGE>   15

         of stock, securities or assets as, in accordance with the foregoing
         provisions, such Holder may be entitled to upon exercise of this
         Warrant. The provisions of this paragraph (iii) shall similarly apply
         to successive consolidations, mergers or sales of assets.

                  (b) Notice of Adjustment. Upon each adjustment of the Exercise
Price, the Company shall give prompt written notice thereof addressed to the
Holder at the address of such Holder as shown on the Certificate Register, which
notice (1) shall state the new Exercise Price resulting from such adjustment,
(2) shall state the increase or decrease, if any, in the number of Warrant
Shares issuable upon exercise hereof, and (3) shall set forth in reasonable
detail the method of calculation and the facts upon which such calculation is
based.

                  (c) No Impairment. The Company will not, by amendment of this
Warrant or through any reorganization, transfer of assets, consolidation,
merger, dissolution, issue or sale of securities or any other voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed hereunder by the Company under this Section 6, but will at
all times in good faith assist in the carrying out of all the provisions of this
Section 6 and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the Holder against impairment.

                  (d) Notice of Capital Changes.

                           (1) If at any time:

                           (i) the Company shall declare any dividend or
         distribution (other than a cash dividend) payable to the holders of its
         Common Stock;

                           (ii) the Company shall offer for subscription pro
         rata to the holders of Common Stock any additional shares of stock of
         any class or other rights;

                           (iii) there shall be any capital reorganization or
         reclassification of the capital stock of the Company, or consolidation
         or merger of the Company with, or sale of all or substantially all of
         its assets to, another company or business organization;

                           (iv) there shall be any issuance of securities
         convertible into, or rights or warrants to purchase, securities of the
         Company; or

                           (v) there shall be a voluntary or involuntary
         dissolution, liquidation or winding up of the Company;

         then, in any one or more of such cases, the Company shall give the
         Holder written notice of the date on which a record shall be taken for
         such dividend, distribution or subscription rights or for determining
         shareholders entitled to vote upon such reorganization,
         reclassification, consolidation, merger, sale, dissolution, liquidation
         or winding up and of the date when any such transaction shall take
         place, as the case may be. Such notice shall also specify the date as
         of which the Holder may exercise this Warrant such that the Warrant
         Shares of record shall participate in such dividend, distribution or
         subscription rights, or shall be entitled to exchange the Warrant
         Shares for securities or other property deliverable upon such
         reorganization, reclassification, consolidation, merger, sale,

                                       15
<PAGE>   16

         dissolution, liquidation, or winding up, as the case may be. Such
         written notice shall be given at least thirty (30) days prior to the
         transaction in question and not less than twenty (20) days prior to the
         record date in respect thereto.

                           (2) The adjustment to the number of shares of Common
         Stock issuable upon the exercise hereof and the adjustments to the
         Exercise Price described in this Section 6 shall be made each time any
         event listed in this Section 6 occurs.

                           (3) If the Company takes any action affecting its
         Common Stock after the date hereof, that would be covered by this
         Section 6 but for the manner in which such action is taken or
         structured, other than an action described in this Section 6, which
         would in any way diminish the value of this Warrant or the Warrant
         Shares, then there shall be an adjustment as to the Warrant Shares
         purchasable therefor and the Exercise Price payable thereunder in such
         manner as the Board of Directors of the Company shall in good faith
         determine to be equitable under the circumstances.

         7. SALE OF WARRANT OR WARRANT SHARES. Neither this Warrant nor the
Warrant Shares have been registered under the Securities Act, or under the
securities laws of any state. Neither this Warrant nor the Warrant Shares may be
sold, transferred, pledged or hypothecated, in the absence of (i) an effective
registration statement for this Warrant or the Warrant Shares, as the case may
be, under the Securities Act, and such registrations or qualifications as may be
necessary under the securities laws of any state, or (ii) an opinion of counsel
reasonably satisfactory to the Company that such registration or qualification
is not required. The Company shall cause any Stock Certificate evidencing all or
any part of the Warrant Shares prior to any such registration or qualification
of Warrant Shares to bear the following legend:

                  The securities represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, or
                  the securities laws of any state (the "Securities Laws").
                  These securities may not be offered, sold, transferred,
                  pledged, or hypothecated in the absence of registration under
                  applicable Securities Laws, or the availability of an
                  exemption therefrom. This certificate will not be transferred
                  on the books of the Company or any transfer agent acting on
                  behalf of the Company except upon the receipt of an opinion of
                  counsel, satisfactory to the Company, that the proposed
                  transfer is exempt from the registration requirements of all
                  applicable Securities Laws, or the receipt of evidence,
                  satisfactory to the Company, that the proposed transfer is the
                  subject of an effective registration statement under all
                  applicable Securities Laws.

         8. REPLACEMENT OF WARRANT. At the request of the Holder and on
production of evidence reasonably satisfactory to the Company of the loss,
theft, destruction or mutilation of this Warrant, the Company at its expense
will issue in lieu thereof a new Warrant of like tenor.

         9. NO VOTING RIGHTS. This Warrant shall not be deemed to confer upon
the Holder any right to vote or to consent to or receive notice as a stockholder
of the Company, as such, in

                                       16
<PAGE>   17

respect of any matters whatsoever, or any other rights or liabilities as a
stockholder, prior to the exercise hereof.

         10. EXPENSES. The Company will pay all expenses and charges payable in
connection with the preparation, issuance and delivery of this Warrant and all
substitute Warrants. The Holder shall pay all taxes (other than issuance taxes,
including documentary stamp taxes, transfer taxes and other governmental
charges, which shall be paid by the Company) in connection with such issuance
and delivery of the Warrants and the Subscribed Shares.

         11. RESERVATION OF SHARES. The Company will at all times reserve and
keep available, free from preemptive rights, out of the aggregate of its
authorized but unissued Common Stock or its authorized and issued Common Stock
held in its treasury, solely for the purpose of enabling it to satisfy any
obligation to issue shares of Common Stock upon exercise of this Warrant, the
Maximum Number of Warrant Shares. The Company covenants that all Warrant Shares
which may be issued upon exercise of this Warrant will, upon issue, be fully
paid, nonassessable, free of preemptive rights and free from all taxes, liens,
charges and security interests with respect to the issue thereof.

         12. INVESTMENT COVENANT. The Holder by its acceptance of this Warrant
covenants that this Warrant is, and the Warrant Shares issued hereunder will be,
acquired for investment purposes, and that the Holder will not distribute this
Warrant or the Warrant Shares in violation of any Securities Laws.

         13. FRACTIONAL SHARES. No fractional shares or scrip representing
fractional shares of Common Stock shall be issued upon the exercise hereof. Upon
exercise by any Holder, such Holder shall be entitled to receive the aggregate
full number of shares of Common Stock in which all the Warrant Shares being
subscribed for by such Holder may exercise and in lieu of any fractional share
to which such Holder would otherwise be entitled, an amount in cash equal to
such fractional share multiplied by the Current Market Price shall be paid by
the Company in cash to such holder.

         14. COMPUTATIONS. The certificate of any firm of independent public
accountants of nationally recognized standing selected by the Company shall be
conclusive evidence of the correctness of any computation under this Warrant.

         15. OWNER OF WARRANT. The Company shall keep a register (the
"Certificate Register") of this Warrant and of its transfer and exchange in
accordance with the provisions of Sections 5 and 7 hereof. The Certificate
Register shall show the names and addresses of the respective Holder(s) and the
date and number of Warrant Shares represented by the Warrants. The Company shall
be entitled to treat the Person in whose name a Warrant is registered as the
absolute owner of such Warrant for all purposes. The Company shall have no duty
to inquire into adverse claims to, or the authenticity of any signature of any
purported holder of, this Warrant.

         16. REGISTRATION RIGHTS. The Holder's rights with respect to the
registration and sale of this Warrant and the Warrant Shares are governed by the
Registration Rights Agreement, the

                                       17
<PAGE>   18

terms and conditions of which are incorporated herein by reference. The Company
and the Holder agree that this Warrant and the Warrant Shares, as well as all
other warrants to purchase Common Stock and shares of Common Stock held by the
Holder or by its permitted transferees of such other warrants or shares, shall
be subject to the Registration Rights Agreement.

         17. VALIDITY OF SHARES. All Common Stock which may be issued upon
exercise of this Warrant will, upon issuance, be legally and validly issued,
fully paid and non-assessable and free from all taxes, liens and charges with
respect to the issue thereof.

         18. MISCELLANEOUS.

                  (a) Governing Law. This Warrant shall be governed by and
construed in accordance with the laws of the State of Delaware, without
reference to the conflict of law principles thereof.

                  (b) Successors and Assigns. This Warrant shall bind the
Company and its successors and assigns, and shall benefit and bind the Holder
and the Holder's successors and permitted assigns.

                  (c) Section Headings. The Section headings in this Warrant
have been included solely for ease of reference and shall not be considered in
the interpretation or construction of this Warrant. All references in this
Warrant to "Sections" shall be construed as references to numbered Sections of
this Warrant.

                  (d) Notices. Any notice or delivery required or permitted by
this Warrant shall be deemed given or made for all purposes of this Warrant when
the notice is in writing, and the notice is delivered (1) by hand, (2) by
facsimile, the receipt of which is confirmed by return facsimile, or (3) by
first class registered mail, return receipt requested, addressed to the intended
recipient at (i) in the Company's case, the Company's Office, or (ii) in the
Holder's case, the Holder's address as set forth in the Company's records or at
such other address as the Holder may designate by written notice to the Company.

                  (e) Entire Agreement. This Warrant, together with the
Registration Rights Agreement, the Systems Access Agreement, the First Network
Services Agreement and the Second Network Services Agreement, contains the
entire understanding and agreement among the parties hereto with respect to the
Warrants to be issued to the Holder, and supersedes all prior oral or written
understandings and agreements relating thereto, except as otherwise expressly
provided.

                  (f) Amendment; Waiver. This Warrant cannot be amended,
supplemented or changed, and no provision hereof can be waived, in whole or in
part, except by written instrument making specific reference to this Warrant
signed by the parties hereto. No failure or delay on the part of any party in
exercising any right, power or remedy hereunder shall operate as a waiver
thereof; nor shall any single or partial exercise of any such right, power or
remedy preclude any other or further exercise thereof or the exercise of any
other right, power or remedy hereunder.

                                       18
<PAGE>   19

                  (g) Severability. If any provision of this Warrant shall be
held to be illegal, invalid or unenforceable under present or future laws, such
provision shall be fully severable, this Warrant shall be construed and enforced
as if such illegal, invalid or unenforceable provision had never comprised a
part of this Warrant, and the remaining provisions of this Warrant shall remain
in full force and effect and shall not be affected by the illegal, invalid or
unenforceable provision or by its severance from this Warrant.

                  (h) Counterparts. This Warrant may be executed in
counterparts, each of which is an original and all of which, taken together,
shall constitute a single instrument.

                     [THIS SPACE INTENTIONALLY LEFT BLANK.]

                                       19
<PAGE>   20

         IN WITNESS WHEREOF, this Warrant has been executed as of the 12th day
of May, 2000.

                                   HIGH SPEED ACCESS CORP.

                                   By /s/ High Speed Access Corp.
                                      ------------------------------------------
                                   Name:
                                         ---------------------------------------
                                   Title:
                                          --------------------------------------

                                   CHARTER COMMUNICATIONS, INC.

                                   By /s/ Charter Communications, Inc.
                                      ------------------------------------------
                                   Name:
                                         ---------------------------------------
                                   Title:
                                          --------------------------------------

                                   CHARTER COMMUNICATIONS
                                            HOLDING COMPANY, LLC

                                   By:      CHARTER COMMUNICATIONS, INC.,
                                               its Manager

                                   By /s/ Charter Communications, Inc.
                                      ------------------------------------------
                                   Name:
                                         ---------------------------------------
                                   Title:
                                          --------------------------------------

                                       20
<PAGE>   21

                                    EXHIBIT A

                        SUBSCRIPTION FORM TO BE EXECUTED
                          UPON EXERCISE OF THE WARRANT

Date:
      ----------------

To HIGH SPEED ACCESS CORP.:

         The undersigned, as the Holder, hereby subscribes, at the price and
upon the other terms and conditions set forth in this Warrant of which this
subscription form is a part, for _________ shares of the common stock, $.01 par
value, of High Speed Access Corp. The undersigned represents, warrants and
covenants that this exercise of this Warrant conforms to the requirements of
Section 3 of this Warrant.

                                   CHARTER COMMUNICATIONS, INC.

                                   By
                                      ------------------------------------------
                                   Name:
                                         ---------------------------------------
                                   Title:
                                          --------------------------------------

                                   Address:
                                           -------------------------------------

                                       21
<PAGE>   22

                                    EXHIBIT B

                                  TRANSFER FORM

[To be completed and signed only upon transfer of Warrant before exercise.]

                  For value received, the undersigned hereby transfers this
Warrant entitling the Holder to subscribe for ________________ shares of the
common stock, with $0.01 par value, of High Speed Access Corp. to
_______________________________. The undersigned represents, warrants and
covenants that this transfer conforms to the requirements of Sections 5 and 7 of
the Warrant.

         Dated
                -----------------

                                              ----------------------------------

                                       22

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