Document:

EXHIBIT 10.20

                                  AMENDMENT SIX
                                     TO THE
                            MANAGED NETWORK AGREEMENT
                                     BETWEEN
                       SPRINT COMMUNICATIONS COMPANY, L.P.
                                       AND
                               BRIDGE DATA COMPANY

CONFIDENTIAL MATERIALS HAVE BEEN OMITTED FROM THIS EXHIBIT PURSUANT TO A REQUEST
FOR  CONFIDENTIAL  TREATMENT AND HAVE BEEN FILED  SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

The  Managed  Network  Agreement  ("Agreement")  between  Sprint  Communications
Company, L.P. ("Sprint") and Bridge Data Company ("Bridge"), having an effective
date of March 1, 1995, as amended, is hereby further amended as set forth below.

WHEREAS,  Sprint and Bridge have  previously  entered into an Agreement  for the
provision of managed network services; and

WHEREAS, Sprint and Bridge desire to amend the Agreement.

NOW THEREFORE, the parties mutually agree to the following:

1.       Attachment B. The following item is hereby incorporated into Attachment
         B - MISCELLANEOUS CHARGES:

         III.     CD-ROM CHARGES

                  Provides electronic format for Frame Relay Billing
                  Customer's  monthly  recurring  charge  for  receipt  of  it's
invoice on CD-ROM is *

2.       All other terms and  conditions of the  Agreement  shall remain in full
         force and effect, except as expressly stated herein.

IN WITNESS WHEREOF, the parties have executed this Amendment Five as of the date
of the last signature below.

SPRINT COMMUNICATIONS CO., L.P.              BRIDGE DATA COMPANY

/s/ George Putney                            /s/ Kevin J. Schott
----------------------------------           ----------------------------------
Signature                                    Signature

George Putney                                Kevin J. Schott
----------------------------------           ----------------------------------
Printed Name                                 Printed Name

Branch Manager                               Vice President/Controller
----------------------------------           ----------------------------------
Title                                        Title

5/23/97                                      5/23/97
----------------------------------           ----------------------------------
Date                                         Date

* CONFIDENTIAL TREATMENT REQUESTED
Bridge/Sprint Confidential               -1-EXHIBIT 10.21

CONFIDENTIAL MATERIALS HAVE BEEN OMITTED FROM THIS EXHIBIT PURSUANT TO A REQUEST
FOR  CONFIDENTIAL  TREATMENT AND HAVE BEEN FILED  SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

                                 AMENDMENT SEVEN
                                     TO THE
                            MANAGED NETWORK AGREEMENT
                                     BETWEEN
                       SPRINT COMMUNICATIONS COMPANY L.P.
                                       AND
                               BRIDGE DATA COMPANY

The  Managed  Network  Agreement  ("Agreement")  between  Sprint  Communications
Company L.P. ("Sprint") and Bridge Data Company ("Bridge"),  having an effective
date of March 1, 1995, as amended, is hereby further amended as set forth below.

WHEREAS,  Sprint and Bridge have  previously  entered into an Agreement  for the
provision of Sprint Frame Relay Service and Sprint Managed Network Services; and

WHEREAS,  Sprint and Bridge  desire to extend the  Agreement  for an  additional
three (3) year period.

NOW THEREFORE, the parties mutually agree to the following:

1.       Section  3.  Term and  Extensions.  Paragraphs  (a) and (b) are  hereby
         deleted in their entirety and replaced with the following:

         (a)    The initial term of this  Agreement  shall  commence on the last
                date shown on the signature  page (Seventh  Amendment  Effective
                Date),  and shall  continue  in full  force and  effect  through
                January  31,  2002  unless  terminated  in  accordance  with its
                provisions.

         (b)    Bridge shall have the right to extend the term of this Agreement
                for up to two (2)  successive  one (1) year  periods  after  the
                expiration of the term (as the same may be extended  pursuant to
                section 9).  Bridge must exercise its renewal right by providing
                Sprint thirty days advance  written notice of Bridge's intent to
                extend.

2.       Section 7. Rates and Charges. Section 7 is amended to add the following
         new paragraph:

         "Sprint may adjust its rates and charges or impose additional rates and
         charges on Customer in order to recover amounts that Sprint is

Bridge/Sprint Confidential               -1-                             8/28/98

<PAGE>
         required by governmental or  quasi-governmental  authorities to collect
         on behalf of or pay to others in support  of  statutory  or  regulatory
         programs.  Examples of such programs  include,  but are not limited to,
         the Universal  Service Fund, the  Presubscribed  Interexchange  Carrier
         Charge, and compensation to payphone service providers for use of their
         payphones to access sprint's service."

3.       Section 9.  Minimum  Commitment.  Delete  Section 9 in its entirety and
         replace with the following language:

                  "BRIDGE agrees to achieve a minimum annual commitment  ("MAC")
                  of  * of  Contributory  Services  during  each  Contract  Year
                  (defined  as the 12 billing  month  period  commencing  on the
                  Effective  Date) of the Term.  "Contributory  Services"  shall
                  include  Service  usage  charges for the  following  services,
                  calculated  after the application of all available  discounts:
                  Domestic Sprint Frame Relay Service, Global Sprint Frame Relay
                  Service,  Domestic access lines (including monthly ACF and COC
                  charges), Global access lines, Domestic Sprint Managed Network
                  Services,  Global Sprint Managed  Network  Services,  Domestic
                  Sprint Dedicated  Access  Facilities  ("DAFs"),  Global Sprint
                  DAFs,  Domestic  Sprint  Dedicated  IP  Service,   Sprint  ATM
                  Service,  and  the  total  monthly  circuit  charges  for  the
                  domestic  portion of International  private line circuits.  In
                  the  event  the  Term or  Renewal  Term,  as the  case may be,
                  includes a partial  Contract  Year, the Customer's MAC will be
                  prorated  based  upon the  number  of  months  in the  partial
                  Contract Year.

                  If Bridge is unable to satisfy  the MAC for a  Contract  Year,
                  Bridge  may  "carry  forward"  up to * of  the  MAC  for  such
                  Contract Year and add such amount to the MAC for the following
                  Contract  Year.  If  Customer is unable to satisfy the MAC, as
                  adjusted,  in the last Contract Year of this  Agreement,  then
                  the last  Contract  Year  will be  extended  for 3  additional
                  months.  If, at the conclusion of such extension,  Customer is
                  unable to satisfy the MAC, as adjusted, then Customer must pay
                  Sprint,  in  addition  to all other  charges,  the  difference
                  between  the MAC, as  adjusted,  and  Customer's  Contributory
                  Services Usage Charges in the last Contract year.

                  If Customer terminates this Agreement or ceases to use Network
                  Services to any material  extent,  Customer will pay to Sprint
                  the MAC  divided  by 12  multiplied  by the  number of billing
                  months  remaining in the Term.  Sprint will bill  Customer for
                  such amount on its next  regular  invoice and such amount

Bridge/Sprint Confidential               -2-                             8/28/98
* CONFIDENTIAL TREATMENT REQUESTED
<PAGE>

                  will  be  due  and  payable  according  to the  payment  terms
                  contained in this Agreement.

4.       Attachment  B (Rates  and  Charges)  -  Domestic  Pricing - SECTION I -
         EQUIPMENT  PURCHASE  PRICE.  This SECTION is superseded in its entirety
         and is replaced by the following paragraphs:

SECTION I -  EQUIPMENT PURCHASE PRICE

The following  prices and discount  percentages  will apply to Equipment  Bridge
purchases from Sprint during the Term which is to be located in the  continental
USA.

         a)       Customer will receive a * discount off Sprint's list price (at
                  time of purchase) on all Bay Networks Equipment purchased from
                  Sprint  (except as set forth in  paragraph  (o) below) that is
                  located in the  continental  USA, as long as Bridge  purchases
                  all Bay Networks Equipment through Sprint.

         b)       Customer will receive a * discount off Sprint's list price (at
                  time of purchase)  on Telebit  Networking  Hardware  purchased
                  from Sprint.

         c)       Customer  will be charged a * fixed  non-recurring  charge for
                  each BNC Transceiver  Package purchased from Sprint during the
                  Term. The charge for each BNC Transceiver  Package consists of
                  one  transceiver,   two  terminators,   one  T-Connector,  and
                  installation.

         d)       Customer will receive a * discount off Sprint's list price (at
                  time of purchase) on Microcom Modem  Equipment  purchased from
                  Sprint.

         e)       Customer will be  charged a * fixed  non-recurring  charge for
                  each SP1530 Aduan  purchased from Sprint.  If Bridge  provides
                  the DSUs,  Bridge is responsible  for providing two DSU cables
                  as well as the DSU.  One cable will  connect to the router and
                  one will connect to the Telco demare.

         f)       Customer  will be  charged  a fixed * for each  WAN  Interface
                  Cable (Model No. 930703-008) purchased from Sprint.

         g)       Customer  will be charged a * fixed  non-recurring  charge for
                  each 910418-008 DB(M)/DB25 Cable purchased from Sprint.

Bridge/Sprint Confidential               -3-                             8/28/98
* CONFIDENTIAL TREATMENT REQUESTED
<PAGE>

         h)       Customer  will be charged a * fixed  non-recurring  charge for
                  each 950846-006 DB25(F)/V.35(M) Cable purchased from Sprint.

         i)       Customer  will be charged a * fixed  non-recurring  charge for
                  each 3520 Codex DSU purchased from Sprint.  If Bridge provides
                  the Codex DSUs,  Bridge is responsible for  de-installing  the
                  DSU,  upgrading  the cables,  and shipping the DSU to Sprint's
                  inventory site(s).

         j)       Bridge will receive a * discount  off Sprint's  list price (at
                  time of purchase) on Digital  Transmission  System, Inc. (DTS)
                  Equipment purchased from Sprint.

         k)       Bridge will receive the following  discounts off Sprint's list
                  price  (at time of  purchase)  on  Ascend  (formerly  Cascade)
                  Equipment purchased from Sprint.

         (1)      a * discount on Ascend (formerly Cascade) Equipment  purchased
                  from Sprint, except as set forth in subparagraph (2), below;

         (2)      a * discount on Ascend  Pipeline 75 and  Pipeline 85 Equipment
                  purchased from Sprint; and

         l)       Bridge  will be  charged an * fixed  non-recurring  charge for
                  each Visual Networks  ASE-BDE DSU purchased from Sprint.  This
                  charge  includes  a V.35  Router  Cable,  and a cable  package
                  consisting of one Network  Interface Cable, one Ethernet Patch
                  Cable, and one Administration Port Cable.

         m)       Bridge will be charged a * fixed non-recurring charge for each
                  Visual Networks ASE-EDE purchased from Sprint.

         n)       Bridge will be charged a * fixed non-recurring charge for each
                  Visual Networks ASE-CDE DI purchased from Sprint.

         o)       Bridge will be charged a * fixed non-recurring charge for each
                  Bay Networks ARN Router  purchased from Sprint,  provided that
                  Bridge  places an initial  order for at least 500 ARN  Routers
                  with the following configuration:  Bay Stack 101 10Base-T Hub,
                  ARN Ethernet Base Unit 16 DRAM, ARN Serial Adapter Module,  IP
                  Access Suite 8M PCMCIA, 7919 Power Cord US.

Bridge/Sprint Confidential                    -4-                        8/28/98

* CONFIDENTIAL TREATMENT REQUESTED

<PAGE>

5.       Attachment B (Rates and Charges) - Domestic Pricing - SECTION II. - CPE
         INSTALLATION.  Add  and/or  revise  the  language  in this  Section  as
         follows:

<TABLE>
<CAPTION>

                                       First Device(6)      Second Device (5)
      Equipment                        Install Price        Install Price (same location)
      ---------                        -------------        -----------------------------
<S>                                    <C>                  <C>
      Ascend Pipeline 75                  *                      *
      Ascend Pipeline 85                  *                      *
      Bay Networks ARN Router             *                      *
      Visual Networks ASE-EDE DSU         *                      *
      Visual Networks ASE-CDE DI          *                      *
</TABLE>

"Customer will be charged a * fixed  non-recurring  installation charge for each
of the following occurrences during the Term:

         TP to Cascade Conversions
         TP to TP Conversions
         Hot Cut Moves
         Cascade to Cascade Conversions"

6.       Attachment  B (Rates and  Charges) - Domestic  Pricing - SECTION  III -
         MAINTENANCE. Add and/or revise the language in this Section as follows:

Bridge/Sprint Confidential               -5-                             8/28/98
* CONFIDENTIAL TREATMENT REQUESTED
<PAGE>

         Equipment                       Response               Price

         Ascend Pipeline 75**            Next Day            * each/month
                                         Repair/Return

         Ascend Pipeline 85**            Next Day            * each/month
                                         Repair/Return

         ** The maintenance price for the Ascend Pipeline 75 and Ascend Pipeline
         85 includes maintenance for two modems.

7.       Attachment  B (Rates and  Charges).  Domestic  Pricing - SECTION  VI. -
         FRAME  RELAY -  Paragraph  A.  Access.  Option  I.  This  paragraph  is
         superseded in its entirety by the following paragraphs:

         "Option I

         (a)      If Customer utilizes the access pricing from the SIA contract,
                  Customer will be charged the applicable  rate for local access
                  from the SIA contract for each SIA Domestic Sprint Frame Relay
                  site. For non-SIA Domestic Sprint Frame Relay sites,  Customer
                  will  receive a *  discount  off  Sprint's  monthly  recurring
                  Tariff 8 rates for each  Sprint-provided  56Kbps and T-1 local
                  access line installed or in service during the Term.

         (b)      Sprint  will  waive * of the COC  and  ACF  monthly  recurring
                  charges for each  Sprint-provided  56Kbps or T-1 local  access
                  line installed or in service during the Term.

         (c)      Customer will be charged the  applicable  Sprint Tariff 8 non-
                  recurring  installation charge for each Sprint-provided 56Kbps
                  or T-1 local access line installed during the Term,  except as
                  set forth in subparagraph (d) below.

         (d)      Sprint will waive * of the non-recurring  installation  charge
                  for each  Sprint-provided  TCG type I or type 2 56Kbps  or T-1
                  local access line installed during the Term.

         (e)      Customer  will be charged a * fixed monthly  recurring  charge
                  and a * fixed   non-recurring  installation  charge  for  each
                  additional DSX  assignment  installed or in service during the
                  Term.

         (f)      Customer  will  be  charged  a * fixed  non-recurring  mishome
                  charge for each 56/64 Kbps  access  circuit  mishomed  between
                  Sprint POPs in New York City.

Bridge/Sprint Confidential                 -6-                           8/28/98

* CONFIDENTIAL TREATMENT REQUESTED

<PAGE>

         (g)    Customer  will  be  charged  a  *  fixed  non-recurring  mishome
                charge for each T-1 access circuit  mishomed between Sprint POPs
                in New York City.

8.       Attachment  B (Rates and  Charges)  -  Domestic  Pricing - SECTION VI -
         FRAME RELAY - Paragraph C. PVC.  This  paragraph is  superseded  in its
         entirety by the following paragraphs:

         (a)    Burst Express (Zero CIR) PVCs

         Customer will be charged  a  * fixed monthly  recurring charge for each
         Domestic  Sprint Frame Relay Burst  Express (Zero CIR) PVC installed or
         in service during the Term.

         (b)    Burst Express Plus (Reserved CIR) PVCs

         Customer will be charged the applicable fixed monthly  recurring charge
         from the table below for Domestic Sprint Frame Relay Burst Express Plus
         (Reserved  CIR) PVCs  installed  or in  service  during  the Term.  The
         Monthly Recurring Charge includes two (2) Burst Express Plus PVCs.

                                                  Monthly Recurring Charge
         PVC Speed                                For 2 Burst Express Plus PVCs
         ---------                                -----------------------------
         16 Kbps                                         *
         32 Kbs                                          *
         38.4 Kbs                                        *
         64 Kbps                                         *
         128 Kbps                                        *
         192 Kbps                                        *
         256 Kbps                                        *
         320 Kbps                                        *
         384 Kbps                                        *
         448 Kbps                                        *
         512 Kbps                                        *
         576 Kbps                                        *
         640 Kbps                                        *
         704 Kbps                                        *
         768 Kbps                                        *
         832 Kbps                                        *
         896 Kbps                                        *
         960 Kbps                                        *
         1,024 Kbs                                       *

Bridge/Sprint Confidential                  -7-                          8/28/98
* CONFIDENTIAL TREATMENT REQUESTED
<PAGE>

9.       Attachment B (Rates and Charges) - Domestic  Pricing- SECTION VI. - ATM
         SERVICES. Insert the following item to this Section:

         B.  Port Connection Charges

              Port        Installation Charge        Monthly Recurring Charge
              ----        -------------------        ------------------------
              OC-3            *  each                    *  each per month**

        **No other discounts apply to OC-3 Ports.  Each Port must be ordered for
          a   minimum   term  of  3  years.   Additional   charges   apply   for
          diversity/alternate routing.

10.      Attachment F  (Facilities  Services  Agreement) - Section 2.  Equipment
         Rack Space. Replace the second paragraph with the following language:

         "For lease of the Equipment  Rack Space during the Term,  Customer will
         be charged the fixed  charges set forth  below.  The charges  shall not
         begin until the equipment is installed.

         1)    a fixed  non-recurring  site  preparation  charge  of * for  each
               instance of rack and/or ancillary services  installation activity
               which  includes  up to  two  (2)  consecutive  working  days  for
               installation supervision and escort (thereafter, the escort rates
               as outlined in Paragraph 7 herein will apply);

         2)    the applicable fixed monthly recurring fee set forth below, which
               shall  include  the cost of up to 20 AMPS of AC or DC  electrical
               power furnished to Customer by Sprint hereunder. Customer will be
               charged a  *  fixed charge for each  additional AMP of electrical
               power used by Customer in a month.

                  a)  for each Equipment Rack Space  installed  prior to January
                      1, 1997, a monthly  recurring fee of * for each  Equipment
                      Rack Space per Sprint POP site used; or

                  b)  for each Equipment Rack Space  installed  after January 1,
                      1997, a monthly recurring fee of * for each Equipment Rack
                      Space per Sprint POP site used.

11.      A new section 34 is hereby added to the Agreement, as follows:

         34.   Applicability  of Tariff.  All Standard  Custom  Network  Service
               Arrangement  terms and conditions in Sprint F.C.C.  Tariff No. 12
               apply to this  Agreement.  Rates,  charges and  discounts for all
               types, service

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* CONFIDENTIAL TREATMENT REQUESTED
<PAGE>

         elements,  features  and  other  products  and  services  not  in  this
         Agreement  will be those  provided  under the  applicable  Sprint  base
         service  tariff or public price list.  Additional  terms and conditions
         relating  to  services  provided  to  Customer  are  contained  in  the
         applicable tariffs. The terms and conditions of any Tariff and/or other
         discount or incentive  programs  apply to the services and discounts or
         incentives  available under such Tariff or program. In order to receive
         Term  Plan or other  incentive  discounts  Customer  must  execute  the
         applicable  agreements.  Any terms and  conditions  applicable  to such
         discounts  and/or  programs which Customer elects to participate in are
         in addition to the terms and conditions applicable to the Discounts.

12.      A new section 35 is hereby added to the Agreement, as follows:

         35.   Use of Sprint  Products and  Services.  Customer  uses the Sprint
               Products  and Services as an element of the products and services
               it provides to its customers.  Customer  acknowledges  that it is
               solely  obligated to provide billing and customer  service to its
               customers,  and that it is solely  responsible for collecting all
               amounts owed from its customers. Customer assumes all risk of bad
               debt or  non-payment by its  customers.  Customer  represents and
               warrants  that  invoices  and other  materials it provides to its
               customers  do  not  identify  Sprint.  If it is  determined  that
               Customer's  activities  constitute a resale of telecommunications
               services or similar  activity or if Customer  becomes  subject to
               regulatory filing, licensing or reporting requirements,  Customer
               will be solely  responsible  for  complying  with any  applicable
               laws, regulations, decisions, or orders, inclding the FCCs rules,
               regulations and decisions.

13.      All other terms and  conditions of the  Agreement  shall remain in full
         force and effect, except as expressly stated herein.

IN WITNESS  WHEREOF,  the parties have executed this  Amendment  Seven as of the
date of the last signature below.

SPRINT COMMUNICATIONS                       BRIDGE DATA COMPANY
COMPANY L.P.

                                            /s/ Robert McCormick
------------------------------              -----------------------------
Signature                                   Signature

Bridge/Sprint Confidential               -9-                             8/28/98

<PAGE>

                                                Robert McCormick
------------------------------                  ----------------------------
Printed Name                                    Printed Name

                                                Executive Vice President
------------------------------                  ----------------------------
Title                                           Title

                                                8/28/98
------------------------------                  ----------------------------
Date                                            Date

Bridge/Sprint Confidential               -10-                            8/28/98

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