Document:

<PAGE>
                                                                    EXHIBIT 10.2

                           FIRST AMENDMENT AND CONSENT
                           ---------------------------

                  AMENDMENT AND CONSENT (this "Amendment"), dated as of August
17, 2000, among CD&L, INC. (f/k/a Consolidated Delivery & Logistics, Inc.), a
Delaware corporation (the "Borrower"), and the financial institutions party to
the Loan Agreement referred to below (the "Lenders"). All capitalized terms used
herein and not otherwise defined herein shall have the respective meanings
provided such terms in the Loan Agreement referred to below.

                              W I T N E S S E T H :
                              - - - - - - - - - - -

                  WHEREAS, the Borrower and the Lenders are parties to the Loan
Agreement, dated as of January 29, 1999 (as amended, modified and/or
supplemented through, but not including, the date hereof, the "Loan Agreement");
and

                  WHEREAS, the Borrower has requested, and the Lenders have
agreed, to the amendments and consents provided herein, in each case on the
terms and conditions set forth herein;

                  NOW, THEREFORE, it is agreed:

                  1. Section 1.01 of the Loan Agreement is hereby amended by
deleting the text "(each, a "Loan" and, collectively, the "Loans")" appearing in
said Section.

                  2. Section 1.02 of the Loan Agreement is hereby amended by
inserting the text "on such date" immediately after the word "Loans" appearing
in said Section.

                  3. Section 1.04(a) of the Loan Agreement is hereby amended by
deleting said Section in its entirety and inserting the following new Section
1.04(a) in lieu thereof:

                  "(a) The Borrower's obligation to pay the principal of, and
interest on, each Loan made to it by each Lender (other than a Loan evidenced by
a Subsequent Loan PIK Note) shall be evidenced by a promissory note
substantially in the form of Exhibit A-1, with blanks appropriately completed in
conformity herewith (each, a "Non-PIK Note" and, collectively, the "Non-PIK
Notes")."

                  4. Section 1.04 of the Loan Agreement is hereby further
amended by (i) deleting the word "Note" appearing in Section 1.04(b) of the Loan
Agreement and inserting the text "Non-PIK Note" in lieu thereof, (ii)
redesignating clause (c) of said Section as clause (d) and (iii) inserting the
following new clause (c) immediately after clause (b) appearing in said Section:

                  "(c) On each date prior to the Final Compliance Date in
respect of which the Borrower has elected pursuant to Section 1.05(a)(II) to pay
a portion (the "PIK Portion") of the interest payable on such date through the
issuance of Subsequent Loan PIK Notes, the Borrower shall execute and deliver to
each Lender with Loans outstanding on such date a promissory note substantially
in the form of Exhibit A-2 hereto in a principal amount equal to such Lender's
pro rata portion of such PIK Portion and with other appropriate insertions
(each, a "Subsequent Loan PIK Note"). Each Subsequent Loan PIK Note shall bear
interest from time to time from the date of its issuance at the same rate borne
by the outstanding Non-PIK Notes, which interest shall be payable on the same
basis as the interest on the outstanding Non-PIK Notes is payable."

<PAGE>

                  5. Section 1.05(a) of the Loan Agreement is hereby amended by
deleting said Section in its entirety and inserting the following new Section
1.05(a) in lieu thereof:

                  "(a) (I) The Borrower agrees to pay interest in respect of the
unpaid principal amount of each Loan from the date such Loan is made until the
maturity thereof (whether by acceleration or otherwise), at a rate which shall
at all times be equal to 12% per annum; provided that notwithstanding the
foregoing, (i) during the period commencing on July 1, 2000 and ending on the
earliest of (w) the maturity of such Loan (whether by acceleration or
otherwise), (x) December 31, 2000, (y) that date on which the Borrower delivers
to each of the Lenders an officer's certificate from the chief financial officer
of the Borrower, which certificate shall demonstrate the Borrower's compliance
with Sections 6.07 and 6.08 as if Sections 7 and 8 of the First Amendment were
not effective on such date, attach financial calculations (in reasonable detail)
establishing such compliance and otherwise be in a form satisfactory to the
Lenders and (z) that date after the effectiveness of the First Amendment upon
which (A) the Borrower and/or any of its Subsidiaries shall have received Net
Sale Proceeds from the sale, transfer and/or other disposition by the Borrower
and/or any of its Subsidiaries to any Person (other than the Borrower or any of
its Subsidiaries) of any assets of the Borrower and/or such Subsidiaries
(including, without limitation, capital stock and securities held by any such
Person but excluding sales, transfers or other dispositions of inventory in the
ordinary course of business) exceeding $12.0 million in the aggregate for all
such sales, transfers and other dispositions, (B) the Borrower shall have
utilized at least $12.0 million of such Net Sale Proceeds to (i) make permanent
repayments of term loans, or permanent reductions of revolving commitments,
under the Credit Agreement and/or (ii) prepay at least 50% of the aggregate
principal amount the Loans outstanding on the date hereof in accordance with the
requirements of Section 2.02 and (C) a senior executive officer of the Borrower
shall have delivered an officer's certificate to the Lenders certifying
compliance with the requirements of clauses (A) and (B) above (with the earlier
of the dates referred to in clauses (y) and (z) above being herein called the
"Asset Sale/Financial Covenant Compliance Date"), the Borrower agrees to pay to
each Lender interest in respect of the unpaid principal amount of each such Loan
made by such Lender at a rate equal to 13% and (ii) during the period commencing
on January 1, 2001 and ending on the Final Compliance Date, the Borrower agrees
to pay to each Lender interest in respect of the unpaid principal amount of each
such Loan made by such Lender at a rate equal to 13% plus (i) at any time during
the fiscal quarter of the Borrower ended March 31, 2001, 0.50%, (ii) at any time
during the fiscal quarter of the Borrower ended June 30, 2001, 1.00%, (iii) at
any time during the fiscal quarter of the Borrower ended September 30, 2001,
1.50% and (iv) at any time thereafter, 2.00%.

                  (II) To the extent the interest on all Loans determined
according to Section 1.05(a)(I) for any period for which interest is to be paid
as provided in Section 1.05(c) exceeds the interest that would be payable on all
Loans for such period if the applicable rate were 14% per annum, the Borrower
may elect to pay, through the issuance of Subsequent Loan PIK Notes as
contemplated by Section 1.04(c) in an aggregate principal amount equal thereto,
a portion (which may be 100%) of the excess interest that has so accrued as the
Borrower elects by giving written notice (or telephone notice confirmed in
writing) to the Lenders at least one Business Day prior to the applicable
interest payment date. If the Borrower elects to pay all or any portion of such
excess interest through the issuance of Subsequent Loan PIK Notes, each Lender
will receive its pro rata share of Subsequent Loan PIK Notes and cash interest
paid. Notwithstanding the foregoing, all interest due on any past due amounts
pursuant to this Agreement (including interest accruing at the increased rates
provided in Section 1.05(c)) shall be payable only in cash, and no portion
thereof shall be satisfied through the issuance of Subsequent Loan PIK Notes.".

                  6. Section 1.05(b) of the Loan Agreement is hereby amended by
(i) deleting the text "14%" appearing in said Section and inserting the text
"the rate which is 2.0% in excess of the higher of (x) the rate borne by such
Loan immediately prior to the respective payment default and (y) the rate
applicable to such Loan from time to time as specified in Section 1.05(a)(I)"
and (ii) deleting the text "17%" appearing in said Section and inserting the
text "the rate which is 3.0% in excess of the higher of (x) the rate borne by
such Loan immediately prior to the respective payment default and (y) the rate
applicable to such Loan from time to time as specified in Section 1.05(a)(I)".

                  7. Notwithstanding anything to the contrary contained in the
definition of Consolidated EBITDA appearing in the Loan Agreement or elsewhere

<PAGE>

in the Loan Agreement, for purposes of any determination of compliance with
Section 6.07 or 6.08 of the Loan Agreement, the Consolidated EBITDA for the
fiscal quarter of the Borrower ended March 31, 2000 included in the Consolidated
EBITDA for any period of four consecutive fiscal quarters ending on a date
specified in the tables appearing in either such Section shall be deemed to be
$1,700,000.

                  8. Notwithstanding anything to the contrary contained in the
definition of Fixed Charge Coverage Ratio or elsewhere in the Loan Agreement,
solely for purposes of any determination of compliance with Section 6.08 of the
Loan Agreement for the period of four consecutive fiscal quarters (taken as one
accounting period) ending on September 30, 2000, there shall be excluded from
the calculation of the Fixed Charge Coverage Ratio for such period any deduction
for taxes paid by the Borrower and any of its Subsidiaries during such period
otherwise required by such definition.

                  9. Section 8.01 of the Loan Agreement is hereby amended by (i)
deleting the definitions of "Loan" and "Note" appearing in said Section and (ii)
inserting the following new definitions in appropriate alphabetical order in
said Section:

                  "Asset Sale/Financial Covenant Compliance Date" shall have the
meaning provided in Section 1.05(a).

                  "Final Compliance Date" shall mean, with respect to any Loan,
the earlier to occur of (i) the maturity of such Loan (whether by acceleration
or otherwise) and (y) the Asset Sale/Financial Covenant Compliance Date.

                  "First Amendment" shall mean the First Amendment to this
Agreement, dated as of August 17, 2000.

                  "Loan" shall mean (i) each loan made by a Lender on the
Funding Date pursuant to Section 1.01 and (ii) the initial principal amount of
each Subsequent Loan PIK Note issued hereunder.

                  "Note" shall mean and include each Non-PIK Note and each
Subsequent Loan PIK Note.

                  "Non-PIK Note" shall have the meaning provided in Section
1.04(a).

                  "PIK Portion" shall have the meaning provided in Section
1.04(c).

                  "Subsequent Loan PIK Note" shall have the meaning provided in
Section 1.04(c).

                  10. The Loan Agreement is hereby forth amended by (i)
redesignating Exhibit A thereto as "Exhibit A-1" and (ii) adding Exhibit A-2
thereto in the form of Exhibit A-2 attached hereto.

                  11. This Amendment is limited as specified and shall not
constitute a modification, acceptance or waiver of any other provision of the
Loan Agreement or any other Loan Document.

                  12. This Amendment may be executed in any number of
counterparts and by the different parties hereto on separate counterparts, each
of which counterparts when executed and delivered shall be an original, but all
of which shall together constitute one and the same instrument. A complete set
of counterparts shall be lodged with the Borrower and the Lenders.

                  13. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE
PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW
OF THE STATE OF NEW YORK.

                  14. This Amendment shall become effective on the date (the
"First Amendment Effective Date") when (i) the Borrower and the Required Lenders

<PAGE>

shall have signed a counterpart hereof (whether the same or different
counterparts) and shall have delivered (including by way of facsimile
transmission) the same to the Lenders at the Notice Office and (ii) the Lenders
shall have received a consent to the Credit Agreement, which consent shall
modify the financial covenants contained therein on a basis satisfactory to the
Required Lenders and otherwise be in form and substance satisfactory to the
Required Lenders.

                  15. In order to induce the Lenders to enter into this
Amendment, the Borrower hereby represent and warrant that (i) no Default or
Event of Default exists as of the First Amendment Effective Date, after giving
effect to this Amendment, and (ii) on the First Amendment Effective Date, after
giving effect to this Amendment, all representations and warranties contained in
the Loan Agreement and in the other Loan Documents are true and correct in all
material respects (it being understood and agreed that any representation or
warranty which by its terms is made as of a specified date shall be true and
correct in all material respects only as of such specified date).

                  16. From and after the First Amendment Effective Date, all
references in the Loan Agreement and each of the Loan Documents to the Loan
Agreement shall be deemed to be references to the Loan Agreement as modified
hereby.

                                   *    *    *

<PAGE>

                                                           EXHIBIT A-2

                        FORM OF SUBSEQUENT LOAN PIK NOTE

$[___________]                                         New York, New York
                                                              [----------]

                  FOR VALUE RECEIVED, CD&L, INC. (f/k/a CONSOLIDATED DELIVERY &
LOGISTICS, INC.), a Delaware corporation (the "Borrower"), hereby promises to
pay to the order of _____________ (the "Lender"), in lawful money of the United
States of America in immediately available funds, at the office of the Lender
located at [______________] on the Maturity Date (as defined in the Agreement
referred to below) the principal sum of _____________ DOLLARS ($_____).

                  The Borrower promises also to pay interest on the unpaid
principal amount hereof in like money at said office from the date hereof until
paid at the rates and at the times provided in Section 1.05 of the Agreement
referred to below.

                  This Note is one of the Subsequent Loan PIK Notes referred to
in the Senior Subordinated Loan Agreement, dated as of January 29, 1999, among
the Borrower and the financial institutions from time to time party thereto
(including the Lender) (as amended, modified and/or supplemented from time to
time, the "Agreement") and is entitled to the benefits thereof. This Note is
also entitled to the benefits of the Subordinated Guaranty (as defined in the
Agreement). As provided in the Agreement, this Note is subject to voluntary
prepayment and mandatory repayment prior to the Maturity Date, in whole or in
part. This Note is subordinated to the "Senior Indebtedness" as defined in the
Agreement and the Borrower agrees, and the Lender agrees by accepting this Note,
to the subordination provided in the Agreement.

                  In case an Event of Default (as defined in the Agreement)
shall occur and be continuing, the principal of and accrued interest on this
Note may be declared to be due and payable in the manner and with the effect
provided in the Agreement.

                  The Borrower hereby waives presentment, demand, protest or
notice of any kind in connection with this Note.

                  THIS NOTE SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE
GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

                                           CD&L, INC.

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

<PAGE>

                  IN WITNESS WHEREOF, each of the parties hereto has caused a
counterpart of this Amendment to be duly executed and delivered as of the date
first above written.

                                          CD&L, INC.

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

                                           PARIBAS CAPITAL FUNDING LLC

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

<PAGE>

                                           EXETER VENTURE LENDERS L.P.

                                           By:  Exeter Venture Advisors, Inc.,
                                                as its general partner

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

                                           EXETER CAPITAL PARTNERS IV, L.P.

                                           By:  Exeter IV Advisors, L.P., as
                                                its general partner

                                           By:  Exeter IV Advisors, Inc. as
                                                its general partner

                                           By:
                                              --------------------------------
                                                Name:
                                                Title:<PAGE>   1

                                                                    EXHIBIT 10.6

                                                                  EXECUTION COPY

METROPOLITAN NETWORK CAPACITY SALE AGREEMENT ("CAPACITY SALE AGREEMENT") MADE AS
OF THIS 28 DAY OF APRIL, 2000 BY AND BETWEEN MAXCOM TELECOMUNICACIONES, S.A. DE
C.V., A MEXICAN SOCIEDAD ANONIMA DE CAPITAL VARIABLE HAVING ITS PRINCIPAL PLACE
OF BUSINESS AT MAGDALENA 211, COLONIA DEL VALLE, 03100, MEXICO, D.F., MEXICO
("MAXCOM"), AND METRO NET, S.A. DE C.V., A MEXICAN SOCIEDAD ANONIMA DE CAPITAL
VARIABLE HAVING ITS PRINCIPAL PLACE OF BUSINESS AT MICHOACAN 22-B, COLONIA
CONDESA, 06110, MEXICO, D.F., MEXICO ("METRO NET"), PURSUANT TO THE FOLLOWING
FACTS AND CIRCUMSTANCES:

             A. Metro Net has developed, owns and operates a fiber optic network
in Mexico City, pursuant to that certain concession granted by the Mexican
Ministry of Communications and Transportation, dated July 5, 1997, a copy of
which, together with all of its amendments, supplements and modifications as of
the date hereof, is attached hereto as Appendix 1 ("Concession"). The Metro Net
network is fully described in Appendix 2, as amended prior to each Closing Date
(as specifically defined herein) to reflect the construction of any additional
network developed and operated by Metro Net ("DF Network");

             B. Maxcom desires to acquire from Metro Net, pursuant to the terms
and conditions set forth in Article 2. hereof, the irrevocable, exclusive and
unlimited right to use, for the Term, the backbone fiber optic capacity of the
fiber optic strands described in Appendix 2A (such rights herein referred to in
the aggregate as the "Acquired Capacity");

             C. Maxcom further desires an option to acquire from Metro Net,
pursuant to the terms and conditions set forth in Article 3. hereof, the
irrevocable, exclusive and unlimited right to use, for the Term, the backbone
fiber optic capacity of the fiber optic strands described in Appendix 2A (such
rights to acquire fiber optic capacity herein referred to in the aggregate as
the "Optioned Capacity");

             D. Maxcom and Metro Net intend that from and after the acquisition
of the Acquired Capacity and any Optioned Capacity by Maxcom, the DF Network
relating to such capacity shall be maintained by Metro Net for the benefit of
Maxcom, pursuant to the terms of the Maintenance Agreement in the form of
Exhibit A hereto ("Maintenance Agreement");

             E. Maxcom and Metro Net hereby acknowledge that the irrevocable,
exclusive and unlimited right to use any fiber optic capacity acquired from
Metro Net shall not be construed as the purchase by Maxcom of the physical
mediums of transmission or interpreted as the partial or total assignment of the
Concession.

             F. The parties desire to enter into this Capacity Sale Agreement to
define the terms and conditions governing their relationship in connection with
the

<PAGE>   2

acquisition by Maxcom of the Acquired Capacity and the granting to Maxcom of the
option to acquire the Optioned Capacity.

             NOW THEREFORE, in consideration of the mutual obligations herein
contained, the parties enter into this Capacity Sale Agreement pursuant to the
following:

                                     CLAUSES

                                   ARTICLE 1.

                                   DEFINITIONS

             1.1. TERMS. Capitalized terms have the meaning first set out for
such terms in the text hereof or, if no meaning is set out in the text, in
Appendix 4 attached hereto, except where context requires otherwise.

             1.2. INTERPRETATION. Unless otherwise required by the context in
which any term appears: the singular of a term also includes the plural, and the
masculine, the feminine and neuter; references to "Articles", "Sections",
"Exhibits", "Schedules", or "Appendices" are references to articles, sections,
exhibits, schedules or appendices of this Capacity Sale Agreement; the titles of
the Articles and Sections are a matter of convenience of reference only, and do
not affect the meaning or construction of any provision of the agreement where
they are use; references to a particular entity include a reference to such
entity's successor and permitted assigns; the words "herein, "hereof" and
"hereunder" refer to this Capacity Sale Agreement as a whole and not to any
particular section or subsection; the words "include", "includes" or "including"
mean "including, but not limited to"; references to an agreement shall be to
such agreement as amended and supplemented or modified to the date of reference;
references to any applicable Law shall be to such Law as amended, supplemented,
modified or replaced from time to time; and "day" shall mean calendar day, and
whenever an event is to be performed by a particular date, or a period ends on a
particular date, and the date in question falls on a Saturday or Sunday, or a
day when the commercial banks are not authorized to open in the jurisdiction in
which the relevant performance is to occur, the event shall be performed, or the
period shall end, on the next succeeding business day. The parties confirm that
they have agreed to the wording of this Capacity Sale Agreement, and none of the
provisions hereof shall be construed against one party on the ground that such
party is the author of any part hereof.

             1.3. APPENDICES, EXHIBITS AND SCHEDULES. This Capacity Sale
Agreement shall include the following Appendices, Exhibits and Schedules, each
of which is made a part of this Capacity Sale Agreement by this references:

<TABLE>
<S>                                       <C>
                  Appendix 1:               Concession.
</TABLE>

                                        2

<PAGE>   3

<TABLE>
<S>                                       <C>
                  Appendix 2:               Layout of DF Network (including the South Ring portion of the network).

                  Appendix 2A:              Layout and description of Maxcom' Network.

                  Appendix 3:               Maxcom's POPs.

                  Appendix 4:               Index of Definitions.

                  Disclosure Schedule:      Metro Net.

                  Disclosure Schedule:      Maxcom.

                  Exhibit A:                Maintenance Agreement.

                  Exhibit B:                Maxcom Acceptance Protocol.

                  Exhibit C:                Inter Owner Agreement

                  Exhibit D:                Amendment to the Master Services Agreement
</TABLE>

                                   ARTICLE 2.

                             ACQUISITION OF CAPACITY

             2.1. ACQUISITION OF CAPACITY. Subject to the terms and conditions
of this Capacity Sale Agreement, Maxcom agrees to acquire from Metro Net, and
Metro Net agrees to sell to Maxcom, the Acquired Capacity, as follows:

             a) On the First Closing Date (as defined below), Maxcom will
acquire from Metro Net and Metro Net will transfer to Maxcom (i) six (6) fiber
optic strands of backbone fiber optic capacity in the DF Network ("Initial
Capacity") as described in Appendix 2A, and (ii) the connections to the DF
Network of the Points-of-Presence (as defined below) specifically listed in
Appendix 3 hereof for connection on the First Closing (each consisting of six
(6) fiber optic strands of backbone fiber optic capacity) ("Initial Maxcom
POPs").

             b) Provided that the conditions mentioned in Section 2.8 are met on
the Second Closing Date (as defined below), Maxcom will acquire from Metro Net
and Metro Net will transfer to Maxcom six (6) fiber optic strands of backbone
fiber optic capacity on the South Ring Mexico City Backbone route of the DF
Network, as described in Appendix 2 hereof ("South Ring Mexico City Backbone
Capacity").

             c) On Additional Capacity Closing Dates (as defined below), Maxcom
shall have the right, but not the obligation, to acquire from time to time six
(6) fiber

                                        3

<PAGE>   4

optic strands of backbone fiber optic capacity (the "Additional Capacity") on
any new backbone routes to be completed by Metro Net in Mexico City on or before
June 30, 2001 ("Additional DF Network"); in the understanding, however, that the
Acquired Capacity shall not include any fiber optic capacity existing as of the
First or Second Closing Dates (as defined below) that is not expressly part of
the Initial Capacity or the South Ring Mexico City Backbone Capacity.

             2.2. USE OF THE ACQUIRED CAPACITY. Maxcom agrees to use the
Acquired Capacity exclusively to carry out its business as a concessioned
telecommunication services provider pursuant to all applicable laws and
regulations and consistently with the Maintenance Agreement, the Inter Owner
Agreement or any successor agreement thereof. Maxcom further agrees that it
shall not, without the prior written authorization from Metro Net, or as
otherwise provided herein,: (i) directly or indirectly, re-sell, lease or
sublease the Acquired Capacity or the Optioned Capacity, except in compliance
with mandatory provisions provided in applicable law; (ii) offer the Acquired
Capacity or the Optioned Capacity in the form of "dark fiber" to any third
party; (iii) grant or assign "irrevocable rights of usage" relating to the
Acquired Capacity or the Optioned Capacity to any third party; (iv) connect the
Acquired Capacity or the Optioned Capacity to end-user clients; or (v) use the
Acquired Capacity or the Optioned Capacity in any manner that represents a
breach of this Agreement. Maxcom and Metro Net also agree that Maxcom shall use
the Acquired Capacity and any Optioned Capacity exclusively to connect Maxcom's
Points-of-Presence ("POPs") and switches; in the understanding that the switches
of other carriers may only be connected to the Acquired Capacity and any
Optioned Capacity if they meet the criteria to become a Maxcom POP. For the
purposes of this Capacity Sale Agreement, a Point-of-Presence shall be defined
as any location or site in which Maxcom aggregates substantial traffic from two
or more customers as evidenced by Maxcom-owned traffic concentration equipment
(including radios, antennas and other equipment used to concentrate traffic
collected by Maxcom) installed at such site. If Metro Net so requests, Maxcom
shall furnish Metro Net with any information necessary to confirm that such
location meets the criteria to be a Maxcom POP. A list of Maxcom's Initial POPs
and a preliminary list of Maxcom's future POPs ("Maxcom's Designated POPs") is
included in Appendix 3.

             Nothing provided herein shall be interpreted as a limitation for
Maxcom to carry out its business as a concessioned telecommunication services
provider pursuant to all applicable laws and regulations.

             2.3. RIGHT TO ALLOCATE FIBERS. Metro Net reserves the right to
allocate specific fiber optic strands to Maxcom in connection with the Acquired
Capacity, provided that Metro Net will ensure that all fiber optic strands of
the Acquired Capacity are included in a single tube throughout the corresponding
sections of the DF Network that contain the Acquired Capacity. The allocation of
fiber optic strands shall be made prior to each Closing Date, as applicable.

             2.4. NON-ASSUMPTION OF LIABILITIES. Except to the extent expressly
provided herein and in the Maintenance Agreement, the acquisition by Maxcom of
the

                                        4

<PAGE>   5

Acquired Capacity does not impose on Maxcom any obligations or liabilities as
they relate to the DF Network, including but not limited to any obligations or
liabilities for the payment of Taxes, right-of-way fees, duties or obligations
or liabilities assumed or incurred by Metro Net in the development,
construction, ownership, operation, exploitation or commercialization of the DF
Network.

             2.5. PURCHASE PRICE. The purchase price for the Acquired Capacity
("Purchase Price") shall be US$6,750.00 (Six Thousand Seven Hundred and Fifty US
Dollars) per kilometer of fiber optic strand, plus value added tax, payable in
cash on the corresponding Closing Date by wire transfer or delivery of
immediately available funds, except that 15% (fifteen percent) of the Purchase
Price shall be withheld by Maxcom until the date on which the minor deficiencies
contained in the minor deficiencies list ("Punch List") for the corresponding
Closing Date are fully completed to Maxcom's satisfaction.

             2.6. ACQUIRED CAPACITY CLOSINGS. The closings of the acquisition by
Maxcom of the Acquired Capacity as contemplated by this Article 2. shall take
place as follows:

             a) The closing for the acquisition of the Initial Capacity and
Initial Maxcom's POPs ("First Closing") shall take place at a location to be
mutually agreed by the parties commencing at 10:00 a.m. local time on the day
following the satisfaction or written waiver of all conditions to the
obligations of the parties to consummate the First Closing as contemplated by
this Article 2 (other than conditions with respect to actions the respective
parties will take at the First Closing), but in any event no later than May 30,
2000, or such other date as the parties may mutually determine ("First Closing
Date");

             b) The closing for the acquisition of the South Ring Mexico City
Backbone Capacity ("Second Closing") shall take place at a location to be
mutually agreed by the parties commencing at 10:00 a.m. local time on the day
following the satisfaction or written waiver of all conditions to the
obligations of the parties to consummate the Second Closing as contemplated by
this Article 2. (other than conditions with respect to actions the respective
parties will take at the Second Closing), but in any event no later than
November 15, 2000 (and, in any case, within 30 (thirty) days following the date
Metro Net notifies Maxcom that the South Ring Mexico City Backbone is complete),
or such other date as the parties may mutually determine ("Second Closing
Date");

             c) Additional closings may take place in connection with the
acquisition of the Additional Capacity on the dates and at locations to be
mutually agreed by the parties (each an "Additional Capacity Closing").
Additional Capacity Closings may occur when enough route kilometers of
Additional Capacity are available for delivery; in the understanding, however,
that Metro Net shall have the obligation to offer to Maxcom the Additional
Capacity until June 30, 2001 and that no Additional Capacity Closing shall take
place later than September 28, 2001 (each an "Additional Capacity Closing
Date"). Metro Net shall fulfil its obligation to offer the

                                        5

<PAGE>   6

Additional Capacity no later than (i) 60 (sixty) days after Metro Net completes
the construction of any new backbone routes conforming the Additional DF
Network, or (ii) June 30, 2001, whichever occurs first. Maxcom shall have 30
(thirty) days from the date upon which it is notified in writing of the
completion of any new backbone routes comprising the Additional DF Network to
accept in writing Metro Net's offer of such Additional Capacity, and the
corresponding Additional Capacity Closing Date shall occur within 60 (sixty)
days of the date of Metro Net's notice relating to such Additional Capacity.

             2.7. DELIVERIES AT CLOSING. As appropriate, at each of the First,
Second and Additional Capacity Closings:

             a) Metro Net will deliver to Maxcom the various certificates,
instruments, and documents referred to in Section 2.8.1. below;

             b) Maxcom will deliver to Metro Net the various certificates,
instruments, and documents referred to in Section 2.8.2. below; and

             c) Maxcom will deliver to Metro Net, in cash by irrevocable wire
transfer or delivery of other immediately available funds, the Purchase Price
specified in Section 2.5. above (less the 15% (fifteen percent) mentioned
therein) that corresponds to the acquisition of the Initial Capacity (which
includes the Initial Maxcom POPs), the South Ring Mexico City Backbone Capacity
or the Additional Capacity; in the understanding that on the First Closing
Maxcom shall pay to Metro Net the amount specified in Section 9.10. to
compensate Metro Net for transaction costs, provided that such amount shall be
reimbursed to Maxcom if the condition precedent referred to in Section 2.10.2 is
not fulfilled or waived and, therefore, this Capacity Sale Agreement ceases to
exist. Metro Net shall provide Maxcom wire transfer instruction with at least 2
(two) business day prior notice.

             2.8. CONDITIONS TO OBLIGATION TO CLOSE.

             2.8.1.CONDITIONS TO OBLIGATION OF MAXCOM. The obligation of Maxcom
to consummate the transactions to be performed by it in connection with each of
the First, Second and Additional Capacity Closings is subject to satisfaction of
the following conditions:

             a) the representations and warranties set forth in Section 4.1.
below shall be true and correct in all material respects with respect to Metro
Net and the Acquired Capacity as of the corresponding Closing Date and Maxcom
shall have reasonably confirmed such compliance to its satisfaction;

             b) Metro Net shall have performed and complied with all of its
covenants hereunder (including but not limited to those provided in Article 5.)
in all material respects through the corresponding Closing Date and Maxcom shall
have reasonably confirmed such compliance to its satisfaction, in the
understanding that Maxcom shall have the right to request the information and
documentation to

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<PAGE>   7

corroborate that (i) Metro Net has all Government Approvals as of each Closing
and (ii) there are no rights in favor of third parties regarding goods and
materials (including dark fiber) used by Metro Net to develop and construct
Maxcom's Network;

             c) Maxcom shall have reasonably confirmed to its satisfaction
through prior verification, that the Acquired Capacity being delivered by Metro
Net complies with Maxcom's Acceptance Protocol; in the understanding that the
corresponding Closing may take place even if there are some minor deficiencies
as of such Closing Date to be listed in the corresponding Punch List;

             d) no action, suit, or proceeding shall be pending or threatened
against Metro Net before any Government Authority wherein an unfavorable
injunction, judgment, order, decree, ruling, charge or award would (i) prevent
perfection or consummation of any of the transactions contemplated by this
Capacity Sale Agreement, (ii) cause any of the transactions contemplated by this
Capacity Sale Agreement to be rescinded following perfection or consummation,
(iii) affect adversely the right of Maxcom to own, use and control the Acquired
Capacity or the Optioned Capacity, and no such injunction, judgment, order,
decree, ruling, charge or award shall be in effect;

             e) in the case of the First Closing, the parties shall have entered
into the Inter Owner Agreement;

             f) the parties shall have entered into the Maintenance Agreement
or, in the case of the Second Closing and any Additional Capacity Closings,
amended the Maintenance Agreement, including any and all relevant annexes,
appendices and exhibits thereto, to incorporate the South Ring Mexico City
Backbone Capacity or the Additional Capacity, as applicable;

             g) the parties shall have amended Appendix 2 to provide an accurate
and detailed description of the DF Network corresponding to Appendix 2A;

             h) in the case of the First Closing, the parties shall have amended
in an appropriate manner the Master Services Agreement;

             i) all other actions to be taken by Metro Net, and all other
certificates, instruments, and other documents required to effect the
transactions contemplated hereby with respect to the sale of the Acquired
Capacity have occurred and been delivered in form and substance satisfactory to
Maxcom; and

             j) Metro Net shall have delivered to Maxcom a certificate to the
effect that each of the conditions specified in this Section 2.8.1. is satisfied
in all respects.

             2.8.2. CONDITIONS TO OBLIGATION OF METRO NET. The obligation of
Metro Net to consummate the transactions to be performed by it in connection
with each of the First, Second and Additional Capacity Closings is subject to
satisfaction of the following conditions:

                                        7

<PAGE>   8

             a) the representations and warranties set forth in Section 4.2.
below shall be true and correct in all material respects with respect to the
Acquired Capacity as of the corresponding Closing Date; and Metro Net shall have
reasonably confirmed such compliance to its satisfaction;

             b) in the case of the First Closing, the parties shall have entered
into the Inter Owner Agreement;

             c) the parties shall have entered into the Maintenance Agreement
or, in the case of the Second Closing and any Additional Capacity Closings,
amended the Maintenance Agreement, including any and all relevant annexes,
appendices and exhibits thereto, to incorporate the South Ring Mexico City
Backbone Capacity or the Additional Capacity, as applicable;

             d) the parties shall have amended Appendix 2 to provide an accurate
and detailed description of the DF Network corresponding to Appendix 2A;

             e) in the case of the First Closing, the parties shall have amended
in an appropriate manner the Master Services Agreement;

             f) in the case of the First Closing, all other actions to be taken
by Maxcom, and all other certificates, instruments, and other documents required
to effect the transactions contemplated hereby with respect to the sale of the
Acquired Capacity have occurred and been delivered in form and substance
satisfactory to Metro Net; and

             g) Maxcom shall have delivered to Metro Net a certificate to the
effect that each of the conditions specified in this Section 2.8.2. is satisfied
in all respects.

             2.9. CONNECTION OF THE ACQUIRED CAPACITY TO MAXCOM'S POPS. Metro
Net agrees that it will, at Maxcom's written request, connect with a dual
connection the Acquired Capacity and any Optioned Capacity to Maxcom's
Designated POPs, including those listed in Appendix 3 hereto and switches at a
price of US$20,000.00 (Twenty Thousand US Dollars) per POP, minus any
installation costs previously invoiced by Metro Net to Maxcom for such location
(any such POP, a "Future POP"). The connection price shall not apply to the
Initial Maxcom POPs which shall be connected by Metro Net as part of the First
Closing and without additional consideration.

             In the case of the Initial Maxcom POPs (other than Maxcom's
Magdalena switch), a connection price of US$12,000.00 (Twelve Thousand US
Dollars) shall also apply if Maxcom requests a second connection to the Acquired
Capacity, and it is further agreed that any such second connection may be
completed after the First Closing. Metro Net will provide a second connection to
Maxcom's Magdalena switch to the Acquired Capacity at no charge to Maxcom,
provided that Maxcom shall be responsible for obtaining all permits and
permissions related to such second connection. If any Initial Maxcom POP does
not require a second connection

                                        8

<PAGE>   9

to the Acquired Capacity, Metro Net shall make available a connection for that
POP to the Acquired Capacity using the existing access at no additional cost to
Maxcom.

             The indicative pricing above shall include project management and
supervision of a connection consisting of a dual connection to a new POP located
within 100 (one hundred) meters of the Acquired Capacity. Pricing does not
include costs of any Government Approval or additional external fiber, poles or
civil works that may be required, in which case Maxcom shall be responsible for
said additional costs.

             Terms and conditions for connection to POPs more than 100 (one
hundred) meters from the Acquired Capacity will be mutually agreed upon,
although Metro Net shall not be obligated to make any connection greater than
100 (one hundred) meters. Should Metro Net and Maxcom not agree upon the terms
of connection for any POP that is more than 100 (one hundred) meters from the
Acquired Capacity, Maxcom may build such connection on its own, complying at all
times with industry standards, and provided that the connection of any such new
network construction by Maxcom to the Acquired Capacity shall be made by Metro
Net and that said connection is technically feasible and does not affect the DF
Network.

             2.10. CONDITIONS PRECEDENT.

             2.10.1. CONDITION PRECEDENT RELATED TO THE INITIAL CAPACITY. If the
First Closing Date does not occur on or before June 30, 2000 for reasons
reasonably imputable to Metro Net or its contractors, this Capacity Sale
Agreement shall cease to exist due to the non-compliance of this condition
precedent required for its validity and enforceability. In such case, Metro Net
shall pay to Maxcom a compensation fee (as liquidated damages) of US$800,000.00
(Eight Hundred Thousand US Dollars) no later than 30 (thirty) business days
after written notification is delivered by Maxcom to Metro Net. In such case,
Maxcom's obligation to acquire the South Ring Mexico City Backbone Capacity, as
well as its right to acquire the Additional Capacity, shall also cease to exist.

             If, for reasons that are not reasonably imputable to Metro Net or
its contractors the First Closing does not occur on or before such date, Maxcom
and Metro Net will negotiate in good faith a reasonable additional time for such
First Closing to occur and, if appropriate, compensation for Maxcom.

             The parties agree and acknowledge that the acquisition of the
Initial Capacity is subject to and conditioned upon the occurrence of the Second
Closing, therefore to the delivery of the South Ring Mexico City Backbone
Capacity pursuant to the terms and conditions of this Article 2.

             2.10.2. CONDITION PRECEDENT RELATED TO THE SOUTH RING MEXICO CITY
BACKBONE CAPACITY. Maxcom's obligations under this Capacity Sale Agreement are
conditioned to the occurrence of the Second Closing on or before November 30,
2000,

                                        9

<PAGE>   10

therefore to the delivery by Metro Net of the South Ring Mexico City Backbone
Capacity, in the understanding that Maxcom has the right to waive such
condition. If, for reasons reasonably imputable to Metro Net or its contractors,
the Second Closing has not taken place by November 30, 2000, Metro Net will
return to Maxcom, upon Maxcom's request, any payments made under this Capacity
Sale Agreement, with interest at 16% (sixteen percent) per annum, no later than
30 (thirty) business days after written request is delivered by Maxcom to Metro
Net. Maxcom will relinquish all claims and rights with respect to the Initial
Capacity upon receiving the above mentioned amount.

                                   ARTICLE 3.

                  OPTION TO PURCHASE ADDITIONAL FIBER CAPACITY

             3.1. GRANT OF OPTION. Subject to the terms and conditions of this
Capacity Sale Agreement, Metro Net hereby grants to Maxcom the option to acquire
all or any portion of the Optioned Capacity (each an "Option" and jointly the
"Options"). The Optioned Capacity is comprised as follows:

             a) in conjunction with the First Closing Date, Metro Net will grant
to Maxcom an Option allowing Maxcom to acquire the capacity of up to six
additional fiber optic strands of backbone fiber optic capacity in the DF
Network existing as of the First Closing Date ("Initial Capacity Option");

             b) in conjunction with the Second Closing Date, Metro Net will
grant to Maxcom an Option allowing Maxcom to acquire the capacity of up to six
additional fiber optic strands of backbone fiber optic capacity in the South
Ring Mexico City Backbone ("South Ring Mexico City Backbone Capacity Option");
and

             c) in conjunction with any Additional Capacity Closing Date, Metro
Net will grant to Maxcom an Option allowing Maxcom to acquire the capacity of up
to six additional fiber optic strands of backbone fiber optic capacity in the
Additional DF Network ("Additional Capacity Option").

             3.2. CONDITIONS TO THE OPTION. The exercise of the Initial Capacity
Option, the South Ring Mexico City Backbone Capacity Option and any Additional
Capacity Option shall be subject to these conditions:

             a) Maxcom may exercise the corresponding Option only to acquire the
capacity of either 2, 4 or 6 additional fiber strands with respect to the
corresponding Acquired Capacity on any Closing Date;

                                       10

<PAGE>   11

             b) Maxcom may only exercise each Option once with respect to the
corresponding Acquired Capacity on any Closing Date;

             c) the exercise of each Option shall apply to the entirety of the
route distance of the corresponding Acquired Capacity on any Closing Date; and

             d) Maxcom agrees to use the Optioned Capacity in accordance with
the provisions of Section 2.2. hereof.

             3.3. NON-ASSUMPTION OF LIABILITIES. Except to the extent expressly
provided herein and in the Maintenance Agreement, the acquisition by Maxcom of
the Optioned Capacity does not impose on Maxcom any obligations or liabilities
as they relate to the DF Network, including but not limited any obligations or
liabilities for the payment of Taxes, right-of-way fees, duties or obligations
or liabilities assumed or incurred by Metro Net in the development,
construction, ownership, operation, exploitation or commercialization of the DF
Network.

             3.4. OPTION PERIOD. The term of each Option commences on the
Closing Date corresponding to the Acquired Capacity related with such Option and
shall remain in effect until and through the first anniversary of such Closing
Date ("Option Period").

             3.5. ELECTION. Maxcom may elect to exercise the corresponding
Option at any time during the applicable Option Period by delivery of a written
notice to Metro Net. As promptly or practicable after receipt of a given notice,
but in any case within 90 (ninety) days after receipt, Metro Net shall cause the
closing (each such closing date, an "Optioned Capacity Closing Date") for the
acquisition by Maxcom of the portion of the Optioned Capacity to which the
relevant notice refers to occur as contemplated by this Article 3. ("Optioned
Capacity Closing"), provided that the conditions set out in Section 3.9.2. below
have been satisfied.

             3.6. OPTION EXERCISE PRICE. The purchase price for each portion of
the Optioned Capacity shall be US$6,750.00 (Six Thousand Seven Hundred and Fifty
US Dollars) per kilometer of fiber optic strand, plus any amounts corresponding
to the applicable value added tax, payable in cash on the corresponding Optioned
Capacity Closing Date by wire transfer or delivery of immediately available
funds ("Option Exercise Price"), except that 15% (fifteen percent) of the
Purchase Price shall be withheld by Maxcom until the minor deficiencies listed
in the Punch List for the corresponding Optioned Capacity Closing are fully
completed to Maxcom's satisfaction.

             3.7. OPTIONED CAPACITY CLOSINGS. Each Optioned Capacity Closing
shall take place at a location to be mutually agreed by the parties commencing
at 10:00 A.M. local time on the day following the satisfaction or written waiver
of all conditions to the obligations of the parties to consummate the
transactions contemplated by this Article 3. with respect to the portion of the
Optioned Capacity to be acquired (other than conditions with respect to actions
the respective parties will

                                       11

<PAGE>   12

take at the corresponding Optioned Capacity Closing) or such other date as the
parties may mutually determine.

             3.8. DELIVERIES AT THE OPTIONED CAPACITY CLOSINGS. At each Optioned
Capacity Closing with respect to any portion of the Optioned Capacity:

             a) Metro Net will deliver to Maxcom the various certificates,
instruments, and documents referred to in Section 3.9.1 below;

             b) Maxcom will deliver to Metro Net the various certificates,
instruments, and documents referred to in Section 3.9.2 below;

             c) Maxcom will deliver to Metro Net the sum of the Option Exercise
Price corresponding to the Initial Option, the South Ring Mexico City Backbone
Capacity Option or any Additional Option, as applicable, plus any applicable
value added tax.

             3.9. CONDITIONS TO OBLIGATION TO CLOSE AN OPTION.

             3.9.1. CONDITIONS TO OBLIGATION OF MAXCOM. The obligation of Maxcom
to consummate the transactions to be performed by it in connection with any
Optioned Capacity Closing is subject to satisfaction of the following
conditions:

             a) the representations and warranties set forth in Section 4.1.
below shall be true and correct in all material respects as of such Optioned
Capacity Closing Date and Maxcom shall have reasonably confirmed such compliance
to its satisfaction;

             b) Metro Net shall have performed and complied with all of its
covenants hereunder (including but not limited to those provided in Article 5.)
in all material respects through the Optioned Capacity Closing Date and Maxcom
shall have reasonably confirmed such compliance to its satisfaction;

             c) Maxcom shall have reasonably confirmed at its satisfaction
through prior verification that the Optioned Capacity being delivered by Metro
Net at the corresponding Optioned Capacity Closing Date complies with Maxcom's
Acceptance Protocol; in the understanding that the corresponding Optioned
Capacity Closing may take place even if there are some minor deficiencies as of
such Closing Date to be listed in the corresponding Punch List ;

             d) no action, suit, or proceeding shall be pending or threatened
against Metro Net before any Government Authority wherein an unfavorable
injunction, judgment, order, decree, ruling, charge or award would (i) prevent
perfection or consummation of any of the transactions contemplated by this
Capacity Sale Agreement, (ii) cause any of the transactions contemplated by this
Capacity Sale Agreement to be rescinded following perfection or consummation,
(iii) affect

                                       12

<PAGE>   13

adversely the right of Maxcom to own, use and control the Acquired Capacity or
the Optioned Capacity, and no such injunction, judgment, order, decree, ruling,
charge or award shall be in effect;

             e) the parties shall have amended the Maintenance Agreement,
including any and all relevant annexes, appendices and exhibits thereto, to
incorporate the relevant portion of the Optioned Capacity;

             f) all other actions to be taken by Metro Net, and all other
certificates, instruments, and other documents required to effect the
transactions contemplated hereby with respect to the sale of the relevant
portion of the Optioned Capacity have occurred and been delivered in form and
substance satisfactory to Maxcom; and

             g) Metro Net shall have delivered to Maxcom a certificate to the
effect that each of the conditions specified in this Section 3.9.1. is satisfied
in all respects.

             3.9.2. CONDITIONS TO OBLIGATION OF METRO NET. The obligation of
Metro Net to consummate the transactions to be performed by it in connection
with any Optioned Capacity Closing is subject to satisfaction of the following
conditions:

             a) the representations and warranties set forth in Section 4.2.
below shall be true and correct in all material respects as of such Optioned
Capacity Closing Date and Metro Net shall have reasonably confirmed such
compliance to its satisfaction;

             b) the parties shall have amended the Maintenance Agreement to
incorporate the relevant portion of the Optioned Capacity;

             c) all actions to be taken by Maxcom, as appropriate, and all
certificates, instruments, and other documents required to effect the
transactions contemplated hereby with respect to the relevant portion of the
Optioned Capacity have occurred and been delivered in form and substance
reasonably satisfactory to Metro Net; and

             d) Maxcom shall have delivered to Metro Net a certificate to the
effect that each of the conditions specified in this Section 3.9.2. is satisfied
in all respects.

             3.10. RIGHT TO ALLOCATE FIBERS. Metro Net reserves the right to
allocate specific fiber optic strands to Maxcom in connection with the Optioned
Capacity. In this regard, Metro Net will ensure that all fiber optic strands of
the Optioned Capacity are included in a single tube throughout the corresponding
section of the DF Network that contain the Optioned Capacity. The allocation of
the fiber optic strands shall be made prior to each Optioned Capacity Closing
Date.

                                   ARTICLE 4.

                                       13

<PAGE>   14

                         REPRESENTATIONS AND WARRANTIES

             4.1. REPRESENTATIONS AND WARRANTIES OF METRO NET. Metro Net
represents and warrants to Maxcom that the statements contained in this Section
4.1 are correct and complete as of the date of this Capacity Sale Agreement
("Effective Date"), the First Closing Date, the Second Closing Date, any
Additional Capacity Closing Date, and any Optioned Capacity Closing Date (as
though made then and as though the First Closing Date, the Second Closing Date,
any Additional Capacity Closing Date, and any Optioned Capacity Closing Date
were substituted for the Effective Date throughout this Section 4.1), except as
set forth in the disclosure schedule accompanying this Capacity Sale Agreement
and initialed by the parties ("Disclosure Schedule"). The Disclosure Schedule
will be arranged in paragraphs corresponding to the lettered and numbered
paragraphs contained in this Section 4.1.

             4.1.1. ORGANIZATION OF METRO NET. Metro Net is a sociedad anonima
de capital variable organized and validly existing under the Laws of Mexico.

             4.1.2. AUTHORIZATION OF TRANSACTION. Metro Net has full power and
authority (including full corporate power and authority) to execute and deliver
this Capacity Sale Agreement and to perform its obligations hereunder. This
Capacity Sale Agreement constitutes the valid and legally binding obligations of
Metro Net, enforceable in accordance with its terms and conditions.

             4.1.3. NON-CONTRAVENTION. Neither the execution and the delivery of
this Capacity Sale Agreement, nor the consummation of the transactions
contemplated hereby, will (i) violate any Law to which Metro Net is subject or
any provision of the charter and by-laws of Metro Net, or (ii) conflict with,
result in a breach of, constitute a default under, result in the acceleration
of, create in any party the right to accelerate, terminate, modify, or cancel,
or require any notice under any agreement, contract lease, license, instrument,
or other arrangement to which Metro Net is a party or by which it is bound or to
which any of its assets is subject.

             4.1.4. BROKER'S FEES. Metro Net has no liability or obligation to
pay any fees or commissions to any broker, finder, or agent with respect to the
transactions contemplated by this Capacity Sale Agreement for which Maxcom could
become obligated.

             4.1.5. LEGAL COMPLIANCE. Metro Net has complied with all applicable
material Laws, including but not limited to environmental laws, and the terms of
each Government Approval obtained to date, and no action, suit, proceeding,
hearing, investigation, charge, complaint, claim, demand, or notice has been
filed or commenced against it alleging any failure as to comply with applicable
material Laws or the terms of any Government Approval or attempting to revoke or
modify any Government Approval.

             4.1.6. CONCESSION COMPLIANCE. Metro Net has complied with and is in
full compliance with all the provisions, conditions and restrictions provided
for in

                                       14

<PAGE>   15

the Concession and the legal provisions governing the Concession, and is not
aware of any action, investigation or complaint by the Comision Federal de
Telecomunicaciones or by the Secretaria de Comunicaciones y Transportes.

             4.1.7. LABOR OBLIGATIONS COMPLIANCE. Metro Net has complied with
all applicable labor and social security laws and regulations.

             4.1.8. RIGHTS TO DF NETWORK. Except as specified in Section 4.1.8
of the Disclosure Schedule:

             a) Metro Net has good, marketable and free and clear title to the
DF Network, free of encumbrances or liens, except for installments of special
assessments not yet delinquent and recorded easements as described in the
Disclosure Schedule, covenants, and other restrictions also described in the
Disclosure Schedule which do not impair the current and future use or value of
the DF Network;

             b) there are no pending or, to the knowledge of any of Metro Net's
directors and officers, threatened condemnation proceeding, lawsuits, or
administrative actions relating to the DF Network or other matters affecting the
current use of value thereof;

             c) Metro Net has received all Government Approvals, including those
required by the environmental law provisions, required in connection with or for
the development, construction, ownership, operation, exploitation and
commercialization of the DF Network and all such Government Approvals are in
full force and effect and Metro Net is in full compliance therewith;

             d) except for this Capacity Sale Agreement, there are no leases,
subleases, licenses, concessions, rights of use, usufruct or other agreements,
granting to any party or parties the right of use, possession, enjoyment or
control of any portion of the Acquired Capacity or the Optioned Capacity, nor is
there any agreement that would prevent or interfere with Metro Net's full and
punctual performance of all of its obligations under this Capacity Sale
Agreement;

             e) there are no outstanding options or rights of first refusal to
purchase any of the Acquired Capacity or the Optioned Capacity;

             f) there are no parties other than Metro Net in possession or
control of the Acquired Capacity and the Optioned Capacity.

             g) all material rights of way, either granted by Government
Authorities or by private parties, have been obtained, are in full force and
effect or have been duly requested;

             h) all recordations, registrations or filings required to be made
in accordance with applicable law or the Concession before the Comision Federal
de Telecomunicaciones or the Secretaria de Comunicaciones y Transportes, have
been made;

                                       15

<PAGE>   16

             i) the goods and materials, including but not limited to the dark
fiber, used by Metro Net to develop and construct the DF Network have been paid
in full and there are no rights in favor of third parties regarding such goods,
materials and dark fiber; and

             j) there are no material payments pending to be made in favor of
third parties regarding the development and construction of the DF Network.

             4.2. REPRESENTATIONS AND WARRANTIES OF MAXCOM. Maxcom represents
and warrants to Metro Net that the statements contained in this Section 4.2. are
correct and complete as of the Effective Date, the First Closing Date, the
Second Closing Date, any Additional Capacity Closing Date, and any Optioned
Capacity Closing Date (as though made then and as though the First Closing Date,
the Second Closing Date, any Additional Capacity Closing Dates, and any Optioned
Capacity Closing Date were substituted for the Effective Date throughout this
Section 4.2.), except as set forth in the Disclosure Schedule. The Disclosure
Schedule will be arranged in paragraphs corresponding to the lettered and
numbered paragraphs contained in this Section 4.2.

             4.2.1. ORGANIZATION OF MAXCOM. Maxcom is a sociedad anonima de
capital variable organized and validly existing under the Laws of Mexico.

             4.2.2. AUTHORIZATION OF TRANSACTION. Maxcom has full power and
authority (including full corporate power and authority) to execute and deliver
this Capacity Sale Agreement and to perform its obligations hereunder. This
Capacity Sale Agreement constitutes the valid and legally binding obligation of
Maxcom, enforceable in accordance with its terms and conditions.

             4.2.3. NON-CONTRAVENTION. Neither the execution and delivery of
this Capacity Sale Agreement, nor the consummation of the transactions
contemplated hereby will (i) violate any Law to which Maxcom is subject, any
provision of its charter or bylaws, or any of its Government Approvals, or (ii)
conflict with, result in a breach of, constitute a default under, result in the
acceleration of, create in any party the right to accelerate, terminate, modify,
or cancel, or require any notice under any agreement, contract lease, license,
instrument, or other arrangement to which Maxcom is a party or by which it is
bound or to which any of its assets is subject.

             4.2.4. FINANCIAL WHEREWITHAL. Maxcom has the financial resources to
pay the Purchase Price corresponding to any portion of the Acquired Capacity or
the Optioned Capacity, if any, at the time of each Closing.

             4.2.5. GOVERNMENT APPROVALS. Maxcom has received all Government
Approvals required to operate in Mexico as an authorized telecommunications
service provider and to provide the services to be rendered through the Acquired
Capacity and the Optioned Capacity. Maxcom expressly agrees and acknowledges
that Metro Net shall not be responsible, in any manner whatsoever, for the
procurement of any

                                       16

<PAGE>   17

Government Approvals required by Maxcom for the proper use of the Acquired
Capacity or the Optioned Capacity.

             4.2.6. BROKER'S FEES. Maxcom has no liability or obligation to pay
any fees or commissions to any broker, finder, or agent with respect to the
transactions contemplated by this Capacity Sale Agreement for which Metro Net
could become obligated.

             4.2.7. LEGAL COMPLIANCE. Maxcom has complied with all applicable
material Laws and the terms of each Government Approval obtained to date.

                                   ARTICLE 5.

                              COVENANT OF METRO NET

             Metro Net covenants and agrees to take all steps necessary to
maintain in full force and effect the Concession throughout the Term and
guarantee Maxcom's rights to use the Acquired Capacity and any Optioned Capacity
pursuant to the terms of this Capacity Sale Agreement.

                                   ARTICLE 6.

                                 INDEMNIFICATION

             6.1. INDEMNIFICATION.

             6.1.1. BY METRO NET. Metro Net shall protect, indemnify and hold
harmless Maxcom and its Affiliates and Associates against and from any cost,
expense, damage, liability or loss, including reasonable attorneys' and
consultants' fees ("Indemnifiable Cost") arising out of any injury, bodily or
otherwise, to, or death of, persons, or for damage to, or destruction of,
property belonging to or leased by Maxcom, Metro Net, or others (each a
"Claim"), resulting from or attributable to the fault or the Negligence or
Misconduct of Metro Net, its Affiliates or Associates or resulting from, arising
out of, or in any way connected with the performance of Metro Net's obligations
under this Capacity Sale Agreement or the operation of the DF Network (excluding
the Acquired Capacity or the Optioned Capacity as to which the Option is
exercised); excepting only any Indemnifiable Cost arising out of the fault,
Negligence or Misconduct of Maxcom or its Affiliates or Associates.

             6.1.2. BY MAXCOM. Maxcom shall protect, indemnify and hold harmless
Metro Net and its Affiliates and Associates against and from any Indemnifiable
Cost arising out of any injury, bodily or otherwise, to, or death of, persons,
or for damage to, or destruction of, property belonging to or leased by Maxcom,
Metro Net, or others (each a "Claim"), resulting from or attributable to the
fault or the Negligence or Misconduct of Maxcom, its Affiliates or Associates or
resulting from, arising out of, or in any way connected with the performance of
Maxcom's obligations under this Capacity Sale Agreement, the operation of the
Acquired Capacity or the Optioned Capacity, if any, or the rescission of this
Capacity

                                       17

<PAGE>   18

Sale Agreement under its terms, excepting only any Indemnifiable Cost arising
out of the fault, Negligence or Misconduct of Metro Net, its Affiliates or
Associates.

             6.1.3. BY MAXCOM AND METRO NET. If, due to the joint, concurring,
comparative or contributory fault, Negligence or Misconduct of the parties,
either party incurs any Indemnifiable Cost arising out of any loss, damage,
injury or liability of any kind or nature (each a "Claim"), such Indemnifiable
Cost shall be allocated between Metro Net and Maxcom in proportion to their
respective degrees of fault, Negligence, or Misconduct contributing to such
Claim.

             6.2. EMPLOYEES. Neither party nor its Affiliates or Associates
shall be deemed an employee of the other party. Neither party shall bring any
claim against the other party or its Affiliates or Associates with respect to
any liability for compensation under any applicable workmen's compensation Law.

             6.3. NOTICE AND PARTICIPATION. If any party entitled to
indemnification hereunder (the "Indemnified Party") intends to seek
indemnification under this Article from any other party (the "Indemnifying
Party") with respect to any action or Claim, the Indemnified Party shall give
the Indemnifying Party notice of such Claim or action upon the receipt of actual
knowledge or information by the Indemnified Party of any possible Claim or of
the commencement of such Claim or action, which notice shall in no event be
later than the lesser of (i) fifteen (15) days prior to the last day for
responding to such Claim or action or (ii) one half of the period allowed for
responding to such Claim or action. The Indemnifying Party shall have no
liability under this Article 6. for any Claim or action for which such notice is
not provided, to the extent that the failure to give such notice prejudices the
Indemnifying Party.

             6.4. NET AMOUNT. In the event that an Indemnifying Party is
obligated to indemnify and hold any Indemnified Party harmless under this
Article 6., the amount owing to the Indemnified Party shall be the amount of
such Indemnified Party's actual out-of-pocket Indemnifiable Cost, net of any
insurance or other recovery actually received by the Indemnified Party.

             6.5. ASSERTION OF CLAIMS. No Claims of any kind shall be asserted
against any party, its Affiliates or Associates, whether arising out of
contract, tort (including Negligence), strict liability, or any other cause of
or form of action, unless it is filed in a court of competent jurisdiction, or a
demand for arbitration is made, within the applicable statute of limitations
period for such Claim.

             6.6. SURVIVAL OF OBLIGATION. The duty to indemnify under this
Article 6. shall continue in full force and effect notwithstanding the
expiration or termination of this Capacity Sale Agreement, with respect to any
Indemnifiable Cost arising out of an event or condition which occurred prior to
such termination.

                                   ARTICLE 7.

                                       18

<PAGE>   19

                               DISPUTE RESOLUTION

             7.1. DISPUTE RESOLUTION BY MANAGEMENT.

             7.1.1 The parties shall attempt in good faith to resolve or curb
any matter or dispute or difference of whatever nature howsoever arising under,
out of, or in connection with this Capacity Sale Agreement (a "Dispute") by
mutual agreement in accordance with this Article 7. before initiating any legal
action or attempting to enforce any rights or remedies hereunder (including
termination), regardless of whether this Article 7. is referenced in the
provision of this Capacity Sale Agreement that is the basis for any such Dispute

             7.1.2. Any party wishing to resolve or cure a Dispute may give
notice thereof to the other party. Within 5 (five) days of receipt of such
notice, the parties' representatives shall meet to discuss the Dispute and
attempt in good faith and using their best endeavors at all times to resolve the
Dispute and produce written terms of settlement.

             7.1.3 If within 15 (fifteen) days of receipt of the notice referred
to in Section 7.1.2. above, the parties' representatives are unable to resolve
or cure such Dispute, the Dispute shall be referred to senior officers of the
parties for resolution or cure. Such senior officers shall meet to discuss the
Dispute and attempt in good faith and using their best endeavors at all times to
resolve the Dispute and produce written terms of settlement.

             7.1.4 If the Dispute is not resolved as evidenced by the signing of
the written terms of settlement within 30 (thirty) days of receipt of the notice
referred to in Section 7.1.2. above, or such longer period as may be mutually
agreed by the parties, the provisions of Section 7.2. shall apply and shall
provide the exclusive forum for resolving a Dispute, provided, however, that
nothing contained in this Article 7. shall be construed as preventing a party
from seeking preventive judicial measures or relief before a court of competent
jurisdiction.

             7.2. ARBITRATION.

             7.2.1. Where any Dispute is not resolved as provided for in Section
7.1., then the Dispute shall be resolved by an arbitration tribunal (the
"Tribunal") in accordance with this Section 7.2.

             7.2.2. The arbitration shall be conducted in accordance with the
arbitration rules of the Rules of Arbitration of the Arbitration Center of
Mexico ("CAM") as in force at the time such arbitration is commenced (the "CAM
Arbitration Rules").

             7.2.3. The place of arbitration shall be Mexico City, Mexico, or
any other place mutually agreed to by the parties to the Dispute and the
arbitration proceedings shall be conducted in the English language.

                                       19

<PAGE>   20

             7.2.4. The award rendered shall be in writing and shall set forth
in reasonable detail the facts of the Dispute and the reasons for the Tribunal's
decision and shall apportion the costs of the arbitration.

             7.2.5. The award rendered in any arbitration commenced hereunder
shall be final and binding, and the arbitral award may be enforced against the
parties to the arbitration proceeding or their assets wherever they may be found
and a judgment upon the arbitral award may be entered in any court having
jurisdiction thereof. In addition, the parties agree that no party shall have
any right to commence or maintain any legal action or proceeding concerning a
Dispute until the Dispute has been determined in accordance with the arbitration
procedure provided for herein and then only to enforce or facilitate the
execution of the award rendered in such arbitration. The parties hereto hereby
waive, to the extent permitted by Law, any rights to appeal or to review of such
award by any court or tribunal.

             7.2.6. Any arbitration award hereunder shall be payable in Dollars
with interest pendente lite and thereafter until actual payment.

             7.3. CONTINUED PERFORMANCE. During the conduct of dispute
resolution procedures pursuant to this Article 7., (i) the parties shall
continue to perform their respective obligation under this Capacity Sale
Agreement, and (ii) no party shall exercise any other remedies hereunder arising
by virtue of the matters in dispute.

                                   ARTICLE 8.

                                EVENTS OF DEFAULT

       The happening of an event which is deemed to be an event of default
within the meaning of Sections 8.1 or 8.2 (each an "Event of Default")shall give
rise to the right in the non-defaulting party to exercise remedies pursuant to
Section 8.3.

       8.1    DEFAULT BY MAXCOM.

       If Maxcom

       (i)    fails to make payments in accordance with Article 2. relating to
              the Acquired Capacity or Article 3. relating to any Optioned
              Capacity, or

       (ii)   makes use of the Acquired Capacity or the Optioned Capacity in any
              manner other than as agreed to under this Capacity Sale Agreement,

       then Metro Net may notify Maxcom in writing of such failure, setting out
in such notice the details of amounts considered to be due but unpaid, or the
nature of the non-complying use, the date or dates upon which the non-complying
use occurred

                                       20

<PAGE>   21

and the remedy required by Metro Net for cure. If Maxcom fails to cure (i) the
non-payment as to which notice is given within 10 (ten) days after its receipt
of the corresponding notice, or (ii) the non-complying use as to which notice is
given within 30 (thirty) days after its receipt of the corresponding notice,
then an Event of Default shall be deemed to have occurred. Metro Net shall have
the right to collect interest on the unpaid amount at the rate equal to the sum
of the London Interbank Offering Rate as published by the Wall Street Journal on
the date of the invoice as to which payment is due, plus 10 (ten) percentage
points.

       8.2    DEFAULT BY METRO NET.

       If (a) Metro Net fails, for any reason whatsoever (including without
limitation in the event of encumbrance of the Acquired Capacity or the Optioned
Capacity, liquidation or dissolution of Metro Net, insolvency or bankruptcy of
Metro Net, seizure, revocation, cancellation and/or reversion of the Concession
or any or all of the Acquired Capacity or the Optioned Capacity), to satisfy any
of its obligations under the terms of this Capacity Sale Agreement, including
but not limited to:

       (i)    its obligation to maintain in full force and effect the Concession
              throughout the Term and guarantee Maxcom's rights to use without
              any interference or limitation the Acquired Capacity and any
              Optioned Capacity pursuant to the terms of this Capacity Sale
              Agreement; and

       (ii)   its obligation to provide Maxcom with the Optioned Capacity once
              the corresponding Option has been duly exercised;

       or (b) there is a change of control in Metro Net where Telefonos de
Mexico, S.A. de C.V., directly or indirectly, acquires control of Metro Net,

       then Maxcom may notify Metro Net in writing of such event, setting out in
such notice the nature of the problem, the date or dates upon which the failure
occurred. If Metro Net fails to cure such failure within 30 (thirty) days of
such notice, then an Event of Default shall be deemed to have occurred.

       8.3    REMEDIES. Upon the occurrence of an Event of Default by Maxcom,
Metro Net shall have the right, exercisable at its sole discretion, to exercise
any other remedies available at Law and to receive the corresponding
indemnification, provided that Maxcom shall continue to have the right to use
the Acquired Capacity and the Optioned Capacity pursuant to the terms of this
Capacity Sale Agreement.

       Upon the occurrence of an Event of Default by Metro Net, Metro Net and
Maxcom agree that the terms and conditions of the Inter Owner Agreement shall
immediately enter into effect, in the understanding that Maxcom shall have the
right, at its sole discretion, to exercise any other remedies available at Law,
to receive the corresponding indemnification and/or to terminate this Capacity
Sale Agreement.

                                       21

<PAGE>   22

       If the Inter Owner Agreement does not enter into effect when applicable
or is not enforceable in whole or in part in accordance with its terms for any
reason, even as a result of a third party action (including but not limited to
the telecommunications regulatory authorities, Metro Net's creditors and Metro
Net's customers) or as a result of the application or interpretation of any
applicable law, then this Capacity Sale Agreement may be rescinded and
terminated by Maxcom, without any judicial action or resolution, by giving
notice of such termination to Metro Net. In such event Metro Net shall (x)
reimburse to Maxcom all the amounts paid in connection with this Agreement plus
any interest accrued thereon at a rate of 16% (sixteen percent) per annum, and
(y) pay Maxcom damages (danos y perjuicios). These amounts shall be paid within
the following 10 (ten) days after Maxcom has requested such payment.

                                   ARTICLE 9.

                                  MISCELLANEOUS

             9.1. COUNTERPARTS. This Capacity Sale Agreement may be executed in
several counterparts with the same effect as if all parties thereto had signed
the same document, provided that the several counterparts, in the aggregate,
shall have been signed by all of the parties. All such counterparts of this
Capacity Sale Agreement shall be construed together and shall constitute one
agreement binding upon all the parties hereto.

             9.2. NOTICES. All notices under this Capacity Sale Agreement shall
be in writing and shall be given to the parties entitled thereto at their
respective addresses as herein set forth:

             If to Maxcom:

             Magdalena 211
             Colonia Del Valle
             Mexico, D.F. 03100
             Mexico
             Attn: Chief Operating Officer
             Phone: 5 147 1200
             Fax: 5 147 8655
             with copy to:
             Legal Department
             Phone: 5 147 1114
             Fax: 5 147 8655

             If Metro Net:

             Michoacan 22-B
             Colonia Condesa
             Mexico, D.F. 06110
             Mexico

                                       22

<PAGE>   23

             Attn: Ing. Joao Carlos Tello Chapoy
             Phone: 525-264-4403
             Fax: 525-574-8122

or at such other address as any of the parties may hereafter specify in the same
manner. Unless delivered personally, such notices shall be given by recognized
international courier. Notices shall be deemed to have been received, and shall
be effective, upon receipt. Notices of changes of address by any party shall be
made in writing within 10 (ten) days of the effective date of such change.

             9.3. AMENDMENT. No amendment or modification of this Capacity Sale
Agreement shall be effective unless (i) such amendment or modification is
reduced to writing as signed by the parties; and (ii) amended or modified in
accordance with Law.

             9.4. WAIVER OF TERMS AND CONDITIONS. Any waiver as to any of the
terms or conditions of this Capacity Sale Agreement in one instance shall not
operate as a waiver of the same terms and conditions or prevent the enforcement
of any of the terms and conditions hereof in any other instance.

             9.5. ASSIGNMENT. Except in the case of an assignment by the parties
of their rights (but not the delegation of its liabilities or obligations)
hereunder to an Affiliate, no party may assign its rights or delegate its
obligations under this Capacity Sale Agreement to any third party unless express
consent thereto has been given by the other party. Notwithstanding any other
provision hereof, no party may assign its interests hereunder during a Dispute.
As specific performance by the original parties is of the essence of this
Capacity Sale Agreement, such consent may be given or declined in the sole
discretion of the party not seeking to make the assignment.

             9.6. SUCCESSORS AND ASSIGNS. All the rights, benefits, duties,
liabilities and obligations of the parties hereto shall inure to the benefit of
and be binding upon their respective successors and permitted assigns.

             9.7. APPLICABLE LAW. This Capacity Sale Agreement is executed in
accordance with and is intended to be construed under the Laws of Mexico.

             9.8. PROPRIETARY INFORMATION.

             9.8.1. Any Proprietary Information of a party (the "Disclosing
Party") which is disclosed to or otherwise received or obtained by the other
party (the "Receiving Party") incident to this Capacity Sale Agreement is
disclosed, and shall be held, in confidence, and the Receiving Party shall not
publish or otherwise disclose any Proprietary Information (as hereinafter
defined) to any Person for any reason or

                                       23

<PAGE>   24

purpose whatsoever, or use any Proprietary Information for its own purposes or
for the benefit of any Person, without the prior written approval of the
Disclosing Party, which approval may be granted or withheld by the Disclosing
Party in its sole discretion. Each party's obligation to maintain Proprietary
Information in confidence shall be deemed performed if such party observes, with
respect thereto, the same safeguards and precautions which such party observes
with respect to its own proprietary information of the same or similar kind.

             9.8.2. The term "Proprietary Information" means all information,
written or oral, which has been or is disclosed by the Disclosing Party, or by
any Person in a confidential relationship with the Disclosing Party, or which
otherwise becomes known to the Receiving Party, or to any Person in a
confidential relationship with the Receiving Party, and which (x) relates to
matters such as patents, trade secrets, research and development activities,
draft or final contracts or other business arrangements, books and records,
budgets, cost estimates, pro forma calculations, engineering work product,
environmental compliance, vendor lists, suppliers, manufacturing processes,
energy consumption, pricing information, private processes, and other similar
information, as they may exist form time to time, or (y) the Disclosing Party
expressly designates in writing to be confidential. However, Proprietary
Information shall exclude information falling into any of the following
categories:

             a) information that, at the time of disclosure hereunder, is in the
public domain, other than information that entered the public domain by breach
of this or any other agreement, or in violation of any Law;

             b) information that, after disclosure hereunder, enters the public
domain, other than information that entered the public domain by breach of this
or any other agreement, or in violation of any Law;

             c) information, other than that obtained from third parties, that
prior to disclosure hereunder, was already in the recipient's possession, either
without limitation on disclosure to others or subsequently becoming free of such
limitation;

             d) information obtained by the recipient from a third party having
an independent right to disclose the information; or

             e) information that is available through independent research
without use of or access to the Proprietary Information.

             9.8.3. Each party agrees that it will make available Proprietary
Information received from another party to its Affiliates, consultants, legal
advisors and Associates only on a need-to-know basis, and that all Persons to
whom such Proprietary Information is made available will be made aware of the
confidential nature of such Proprietary Information, and will be required to
agree to hold such Proprietary Information in confidence under terms
substantially identical to the terms hereof.

                                       24

<PAGE>   25

             9.8.4. Nothing herein shall limit the right of the Receiving Party
to provide any Proprietary Information to any Government Authority having
jurisdiction over or asserting a right to obtain such information, provided that
(i) such Government Authority requires or orders that such Proprietary
Information be provided, and (ii) the Receiving Party promptly advises the
Disclosing Party of any request for such information by such Government
Authority and cooperates in giving the Disclosing Party an opportunity to
present objections, requests for limitation, and or requests for confidentiality
or other restrictions on disclosure or access, to such Government Authority.

             9.8.5. In the event of a breach or threatened breach of the
provisions of Section 9.8.1 above by any Receiving Party, the Disclosing Party
shall be entitled to an injunction restraining such party from such breach.
Nothing contained herein shall be construed as prohibiting the Disclosing Party
from pursuing any other remedies available for such breach or threatened breach
of this Capacity Sale Agreement.

             9.8.6. The obligation to retain information in confidence shall
continue in full force and effect during the term of this Capacity Sale
Agreement and for a period of 10 (ten) years thereafter, notwithstanding the
expiration or termination of this Capacity Sale Agreement, with respect to any
information obtained by any party prior to such termination.

             9.9. SEVERABILITY. If any provision of this Capacity Sale Agreement
shall be determined to be unenforceable, void or otherwise contrary to Law, such
condition shall in no manner operate to render any other provision of this
Capacity Sale Agreement unenforceable, void or contrary to Law and this Capacity
Sale Agreement shall continue in force in accordance with the remaining terms
and provisions hereof, unless such condition invalidates the purpose or intent
of this Capacity Sale Agreement. In the event that any of the provisions, or
portions or applications thereof, of this Capacity Sale Agreement are held
unenforceable or invalid by any court of competent jurisdiction, the parties
shall negotiate in good faith to attempt to implement an equitable adjustment in
the provisions of this Capacity Sale Agreement with a view toward effecting the
purposes of this Capacity Sale Agreement by replacing the provision that is
unenforceable, void, or contrary to Law with a valid provision the economic
effect of which comes as close as possible to that of the provision that has
been found to be unenforceable, void, or contrary to Law.

             9.10. EXPENSES; TAXES. Each of the parties hereto shall pay all of
its own Taxes and bear its own costs and expenses incurred in connection with
the negotiation and preparation of this Capacity Sale Agreement and with meeting
the conditions required to be satisfied by it for each of the Closings;
provided, however, that Maxcom shall pay to Metro Net, for the account of Metro
Net as directed, upon the occurrence of the First Closing in accordance with
Section 2.7. above, US$200,000 (Two Hundred Thousand US Dollars), plus any
applicable value added tax, in cash to reimburse Metro Net for its costs and
expenses incurred in preparing to perform under this Capacity Sale Agreement.

                                       25

<PAGE>   26

             9.11. INTEGRATION. There are no understandings between the parties
as to the subject matter of this Capacity Sale Agreement other than as set forth
herein, and this Capacity Sale Agreement, together with the Maintenance
Agreement and the other agreements, documents, documents and showings delivered
at or as conditions to an of the Closing represent the entire understanding
between the parties in relation to the subject matter hereof. This Capacity Sale
Agreement supersedes any and all previous agreements, including any arrangements
or discussions between the parties (whether written or oral) in respect of the
subject matter hereof, all of which are hereby abrogated and withdrawn.

             9.12. SURVIVAL. The applicable provisions of this Capacity Sale
Agreement shall continue in effect after the expiration of the term of this
Capacity Sale Agreement, to the extent necessary to provide for final billing
and adjustment, and to make other appropriate settlements hereunder.

             9.13. PRESS RELEASES AND PUBLICITY. Neither party shall issue any
press release or make any public announcement relating to the subject matter of
this Capacity Sale Agreement without the prior written approval of the other
party.

             9.14. NO THIRD PARTY BENEFICIARIES. This Capacity Sale Agreement
shall not confer any rights or remedies upon any Person other than the parties
and their respective successors and permitted assigns.

             9.15. RELATIONSHIP OF THE PARTIES. Neither party nor its Affiliates
and Associates shall be deemed, by virtue of such party's execution of this
Capacity Sale Agreement to be an affiliate, Associate, contractor, vendor,
representative, joint venturer, member or partner of the other party or its
Affiliates and Associates, and a party may not hold itself out as such.

             9.16. LANGUAGE. The language of this Capacity Sale Agreement and of
all agreements between the parties shall be English unless otherwise agreed to
by the parties in writing. To the extent permitted by Law, the English version
of this Capacity Sale Agreement and of all agreements between the parties shall
prevail over the translation thereof into any other language.

             9.17. FURTHER ASSURANCES. Metro Net and Maxcom shall execute and
deliver any and all additional instruments, papers, deeds, contratos, documents
and other assurances, and shall do any and all acts and things as may be
necessary or appropriate to consummate the transactions contemplated by this
Capacity Sale Agreement and to carry out the intention of the parties.

             9.18. FILING BEFORE THE PUBLIC REGISTRY OF COMMERCE. Metro Net
shall provide all the information and to execute all documents required or
needed in order for Maxcom to be able to file this Capacity Sale Agreement
before the Public

                                       26

<PAGE>   27

Registry of Commerce and registered in the Folio Mercantil corresponding to
Metro Net.

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

             MAXCOM TELECOMUNICACIONES, S.A. DE C.V.

             Illegible signature

             Ing. Gian Carlo Pecchioni
             Chief Executive Officer

             METRO NET, S.A. DE C.V.

             Illegible signature

             Ing. Joao Carlos Tello Chapoy
             Chief Executive Officer

                                       27

<PAGE>   28

                                                                       EXHIBIT A

MAINTENANCE AGREEMENT ("Agreement") MADE AS OF THIS 28 DAY OF APRIL, 2000 (the
"Effective Date") BY AND BETWEEN MAXCOM TELECOMUNICACIONES, S.A. DE C.V., A
MEXICAN SOCIEDAD ANONIMA DE CAPITAL VARIABLE HAVING ITS PRINCIPAL PLACE OF
BUSINESS AT MAGDALENA 211, COLONIA DEL VALLE, 03100, MEXICO, D.F., MEXICO
("MAXCOM"), AND METRO NET, S.A. DE C.V., A MEXICAN SOCIEDAD ANONIMA DE CAPITAL
VARIABLE HAVING ITS PRINCIPAL PLACE OF BUSINESS AT MICHOACAN 22-B, COLONIA
CONDESA, 06110, MEXICO, D.F., MEXICO ("METRO NET"), PURSUANT TO THE FOLLOWING
FACTS AND CIRCUMSTANCES:

       A.     The Parties have entered into a certain Metropolitan Network
Capacity Sale Agreement, dated April 28, 2000 (the "Capacity Sale Agreement").

       B.     Pursuant to the Capacity Sale Agreement, Maxcom has acquired and
has the right to acquire from Metro Net the irrevocable, exclusive and unlimited
right to use, for the Concession Term, certain backbone fiber optic capacity of
the fiber optic strands (the "Acquired Capacity", as further defined in the
Capacity Sale Agreement) of the fiber optic network developed and owned by Metro
Net in Mexico City, as shown in Appendix 1 to this Agreement, as amended from
time to time (the "DF Network"), and Metro Net has granted to Maxcom the option
to acquire certain further capacity in the DF Network (the "Optioned Capacity",
as further defined in the Capacity Sale Agreement). The Acquired Capacity and
the Optioned Capacity correspond to certain fiber strands of the DF Network as
shown in Appendix 1A to this Agreement, as amended from time to time.

       C.     Maxcom and Metro Net intend that, in order for Maxcom to utilize
the Acquired Capacity and such of the Optioned Capacity which it acquires under
the Capacity Sale Agreement to provide services to its customers, Maxcom will
install network integration units, customer premise equipment and other
equipment that will be connected to the DF Network ("Maxcom Equipment"). In
order that the Maxcom Equipment may be connected to the DF Network, the parties
expect that it will be necessary to construct network elements to extend the DF
Network to the Maxcom Equipment (each such extension here referred to as a "Last
Link"), and that Maxcom will install the Maxcom Equipment to Maxcom's own
Optical Distribution Frame (each such point being here referred to as a
"Demarcation Point"). This Agreement is intended to provide for the connection
of the Maxcom Equipment and also set out the parties' understandings with
respect to the maintenance of the Acquired Capacity and, in its case, the
Optioned Capacity, together with the Last Links within the Demarcation Points,
as they may exist from time to time ("Maxcom's Network").

              NOW, THEREFORE, in consideration of the mutual covenants and
conditions herein stated, the parties enter into this Maintenance Agreement
pursuant to the following:

                                        1

<PAGE>   29

                                     CLAUSES

                                    ARTICLE 1
                         DEFINITIONS AND INTERPRETATIONS

       1.1    TERMS. Except where the context requires otherwise, capitalized
terms used in this Agreement have the meanings first given in the text of this
Agreement or, if no meaning is set out in the text, in the Capacity Sale
Agreement.

       1.2. INTERPRETATION. Unless otherwise required by the context in which
any term appears: the singular of a term also includes the plural, and the
masculine, the feminine and neuter; references to "Articles", "Sections",
"Exhibits", "Schedules", or "Appendices" are references to articles, sections,
exhibits, schedules or appendices of this Agreement; the titles of the Articles
and Sections are a matter of convenience of reference only, and do not affect
the meaning or construction of any provision of the agreement where they are
use; references to a particular entity include a reference to such entity's
successor and permitted assigns; the words "herein, "hereof" and "hereunder"
refer to this Agreement as a whole and not to any particular section or
subsection; the words "include", "includes" or "including" mean "including, but
not limited to"; references to an agreement shall be to such agreement as
amended and supplemented or modified to the date of reference; references to any
applicable Law shall be to such Law as amended, supplemented, modified or
replaced from time to time; and "day" shall mean calendar day, and whenever an
event is to be performed by a particular date, or a period ends on a particular
date, and the date in question falls on a Saturday or Sunday, or a day when the
commercial banks are not authorized to open in the jurisdiction in which the
relevant performance is to occur, the event shall be performed, or the period
shall end, on the next succeeding business day. The parties confirm that they
have agreed to the wording of this Agreement, and none of the provisions hereof
shall be construed against one party on the ground that such party is the author
of any part hereof.

       1.3. APPENDICES, EXHIBITS AND SCHEDULES. This Agreement shall include the
following Appendices, Exhibits and Schedules, each of which is made a part of
this Agreement by these references:

<TABLE>
<S>                                     <C>
                  Appendix 1:               Layout of the DF Network.

                  Appendix 1A:              Layout and Description of Maxcom's Network.

                  Appendix 2:               Maxcom's POPs.

                  Exhibit A:                Inter Owner Agreement
</TABLE>

                                        2

<PAGE>   30

                                    ARTICLE 2
                       MAINTENANCE OF NETWORK BY METRO NET

       2.1    UNDERTAKING TO MAINTAIN. Metro Net agrees and commits itself to
maintain Maxcom's Network for the benefit of Maxcom on the terms and conditions
of this Agreement (the "Services"). The obligation of Metro Net to provide the
Services and the parties' respective obligations to perform their various other
undertakings described herein, shall begin on the Effective Date and continue
until Maxcom's rights to use the Acquired Capacity or the Optioned Capacity
expire pursuant to the Capacity Sale Agreement, provided, however, that this
Agreement shall terminate automatically if the Capacity Sale Agreement is
terminated at any time (such period being herein referred to as the "Term").

       Metro Net warrants that it has, and shall maintain throughout the Term,
the skills, experience, equipment and personnel necessary to perform the
Services as required under this Agreement.

       2.2    GENERAL OPERATIONAL GOALS. Metro Net shall perform the Services so
as to cause Maxcom's Network to operate efficiently for the purposes for which
it was designed, with a minimum of interruptions of service, impairments in the
quality of services, or failures in Maxcom's Network ("Outages"). Any work of
any sort performed on Maxcom's Network, including without limitation the
opening, splicing, closing or maintenance of Maxcom's Network, shall be
performed exclusively by Metro Net personnel (who shall be available for that
purpose 24 hours/day). Maxcom may observe any such work without interfering in
the process. Metro Net shall notify Maxcom with reasonable prior notice.

       2.3    STANDARDS FOR PERFORMANCE. Metro Net shall perform the Services in
all material respects in accordance with the following:

       (a)    the standards published from time to time by the International
              Telecommunications Union (commonly referred to as the Maxcom
              TT/ITU), together with the in-country modifications applicable to
              Mexico and adopted by the appropriate regulatory body from time to
              time (the Maxcom TT/ITU, together with such in-country
              modifications herein referred to as the "Industry Standards");

       (b)    all applicable Laws and Government Approvals; and

       (c)    the requirements of all warranties and guarantees applicable to
              any element of Maxcom's Network.

       2.4    GOVERNMENT APPROVALS. Metro Net shall obtain and maintain
throughout the Term, all Government Approvals for the development, construction,
ownership or maintenance of Maxcom's Network, if and to the extent that any such
Government Approvals are required.

                                       3

<PAGE>   31

       2.5    PLANNED MAINTENANCE. Metro Net shall advise Maxcom of its plans
for maintenance of Maxcom's Network, but in any case, Metro Net will give to
Maxcom a minimum of 30 (thirty) days' prior written notice for planned
maintenance that is expected to result in any Outage.

       2.6    OUTAGES. If there occurs any Outage, Metro Net shall immediately
notify Maxcom thereof and it shall provide Maxcom with an assessment of the
extent of the Outage and the estimated Outage time as promptly as practicable.

       2.7    CONNECTION OF THE ACQUIRED CAPACITY TO MAXCOM'S POPS. Metro Net
agrees that it will, at Maxcom's written request, connect with a dual connection
the Acquired Capacity and any Optioned Capacity to Maxcom's Designated POPs,
including those listed in Appendix 3 hereto and switches at a price of
US$20,000.00 (Twenty Thousand US Dollars) per POP, minus any installation costs
previously invoiced by Metro Net to Maxcom for such location (any such POP, a
"Future POP"). The connection price shall not apply to the Initial Maxcom POPs
which shall be connected by Metro Net as part of the First Closing and without
additional consideration.

              In the case of the Initial Maxcom POPs (other than Maxcom's
Magdalena switch), a connection price of US$12,000.00 (Twelve Thousand US
Dollars) shall also apply if Maxcom requests a second connection to the Acquired
Capacity, and it is further agreed that any such second connection may be
completed after the First Closing. Metro Net will provide a second connection to
Maxcom's Magdalena switch to the Acquired Capacity at no charge to Maxcom,
provided that Maxcom shall be responsible for obtaining all permits and
permissions related to such second connection. If any Initial Maxcom POP does
not require a second connection to the Acquired Capacity, Metro Net shall make
available a connection for that POP to the Acquired Capacity using the existing
access at no additional cost to Maxcom.

              The indicative pricing above shall include project management and
supervision of a connection consisting of a dual connection to a new POP located
within 100 (one hundred) meters of the Acquired Capacity. Pricing does not
include costs of any Government Approval or additional external fiber, poles or
civil works that may be required, in which case Maxcom shall be responsible for
said additional costs.

              Terms and conditions for connection to POPs more than 100 (one
hundred) meters from the Acquired Capacity will be mutually agreed upon,
although Metro Net shall not be obligated to make any connection greater than
100 (one hundred) meters. Should Metro Net and Maxcom not agree upon the terms
of connection for any POP that is more than 100 (one hundred) meters from the
Acquired Capacity, Maxcom may build such connection on its own, complying at all
times with industry standards, and provided that the connection of any such new
network construction by Maxcom to the Acquired Capacity shall be made by Metro
Net and that said connection is technically feasible and does not affect the DF
Network.

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<PAGE>   32

              2.8    MAXCOM EQUIPMENT. Throughout the Term, Maxcom shall
be responsible for the connection, installation, control, operation and
maintenance of the Maxcom Equipment on Maxcom's POP sites.

       2.8.1 CONNECTION. Maxcom may request Metro Net to connect any Maxcom
Equipment to Maxcom's Network at any time and from time to time as it deems
necessary or advisable for its business purposes, provided it has first given
Metro Net 7 (seven) days' prior written notice of such request. Metro Net shall
carry out such connection applying Industry Standards, and Maxcom shall
reimburse Metro Net for its out-of-pocket costs incurred in carrying out such
installation to the extent they are reasonable and documented. Maxcom shall not
itself connect any Maxcom Equipment to the DF Network or permit any other Person
to do so.

       2.8.2 CONTROL, ETC. BY MAXCOM. Maxcom must control, install, operate and
maintain the Maxcom Equipment located on Maxcom's POP sites according to its own
standards and procedures, provided that the same does not interfere with or
impair Metro Net's use of the DF Network, complies with applicable Industry
Standards as are set out in Section 2.3, and does not involve any physical
intervention upon the DF Network. In case Maxcom's equipment installation and/or
maintenance interacts in any way with the DF Network, Maxcom shall advise Metro
Net of such action with sufficient notice so Metro Net's engineering crews may
supervise and in its case, assist Maxcom, at Maxcom's expense, in such tasks. If
Maxcom contravenes this stipulation, Metro Net shall not be liable for any
Outage thereof and Maxcom will indemnify Metro Net any damage incurred thereby.

       2.8.3 Maintenance by Metro Net. If a routine maintenance is anticipated
to affect the operation of Maxcom's Network in any manner, or requires physical
intervention upon Maxcom's Network, Metro Net shall give Maxcom notice thereof
(which shall be given as much in advance as is reasonable in the circumstances),
and Metro Net shall perform such repair or maintenance as promptly as
technically feasible (using technical staff that Metro Net keeps readily
available every day for 24 hours per day) and applying the highest Industry
Standards for networks of the same type in the same circumstances. The Parties
hereby expressly agree that no such repair or maintenance may be carried out by
Maxcom or by any Person authorized by Maxcom, except as provided for in Articles
5 and 6. The Parties also agree that any emergency repairs caused by Maxcom to
the DF Network shall be repaired by Metro Net and Maxcom will cover any
business, operating and out of pocket expenses which Metro Net may incur.

                                    ARTICLE 3
                        MAINTENANCE PLAN & RECORD KEEPING

       3.1    MAINTENANCE PLAN. Metro Net shall prepare the maintenance schedule
for Maxcom's Network for each 12- (twelve) month period after the Effective Date
during the Term, which shall include provisions for the necessary Services to be
provided to Maxcom's Network by Metro Net and which shall be consistently
performed with the standards required under this Agreement ("Maintenance Plan").

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<PAGE>   33

       3.2    RECORDS. Throughout the Term, Metro Net shall maintain and retain
complete books and records of all extraordinary occurrences which imply
maintenance outside the Maintenance Plan, for a period of not less than five
years. Metro Net shall ensure that any contracts it enters into in connection
with Maxcom's Network shall include similar provisions.

       3.3    REPORTS. Throughout the Term, Metro Net shall prepare and submit
to Maxcom, on each January 15 and July 15 following the Effective Date, with
respect to the calendar period ending on the last day of the prior month a
maintenance activities report, in reasonable detail, covering normal and, in its
case, extraordinary maintenance, procurement and other significant matters
conducted during the relevant period. The report shall include a listing of any
Outages, if any, and any other significant operating problems and the measures
taken therefore.

       3.4    DRAWINGS, TECHNICAL MATERIALS. Metro Net shall maintain or cause
its suppliers and vendors to maintain, for so long as Maxcom has the right to
use any of Maxcom's Network, all drawings and technical specifications and other
descriptive materials necessary or helpful for the operation of Maxcom's
Network, and shall permit, or cause such suppliers and vendors to permit, Maxcom
to have reasonable access thereto.

                                    ARTICLE 4
                          PAYMENT OBLIGATIONS OF MAXCOM

       4.1    AMOUNT TO BE PAID BY MAXCOM. As compensation for the provision by
Metro Net of the Services, Maxcom shall pay quarterly in arrears to Metro Net an
annual Maintenance Fee equal to US$100,000.00 (One Hundred Thousand US Dollars)
plus any applicable value added tax; provided, however, that such Maintenance
Fee shall increase to US$150,000.00 (One Hundred and Fifty Thousand US Dollars)
plus any applicable value added tax, immediately following the Second Closing
Date, as defined in the Capacity Sale Agreement.

       With respect to the reconstruction or replacement of any portion of
Maxcom's Network due to circumstances not otherwise provided for in this
Agreement, the Parties hereto shall be subject to the following principles:

       a) Maxcom's portion of the costs of any reconstruction or replacement,
          due to Force Majeure shall be proportional to (i) the number of fiber
          strands in Maxcom's Network in the affected portion of Maxcom's
          Network, divided by (ii) the total number of fiber strands in the
          affected portion. For example, if a cable containing 96 total strands
          is to be replaced, and Maxcom's Network contains 6 strands of that
          cable, Maxcom's proportionate share of all costs incurred in replacing
          the cable shall be 6/96 or 6.25%. Metro Net will bear 100% of the
          costs of any insurance deductibles that must be paid in connection
          with the replacement of Maxcom's Network following any event of loss.

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<PAGE>   34

       b) Metro Net will bear 100% of the reconstruction and replacement costs
          for Maxcom's Network associated with the ordinary wear and tear of
          fiber optic cable until December 31, 2005. Thereafter, the parties
          will share such costs in accordance with the same principle described
          in a) above.

       4.2    INVOICES. Metro Net shall invoice Maxcom quarterly in arrears for
Maintenance Fees and, if appropriate, for reconstruction and replacement
expenses incurred in any given calendar quarter and payable by Maxcom under
Section 4.1, within 30 (thirty) days after the end of such quarter.

       4.3    PAYMENT. Maxcom shall pay to Metro Net the sums so invoiced within
30 (thirty) days following the date of receipt of the invoice.

       4.4    CURRENCY. The parties shall pay amounts due under this Article 4
in United States Dollars. Metro Net shall invoice for any cost reimbursable by
Maxcom under this Article 4 and incurred by Metro Net in any currency other than
United States Dollars at the rate of exchange published by the Diario Oficial de
la Federacion on the 15th day of the month in which such cost was incurred by
Metro Net.

                                    ARTICLE V
                                     DEFAULT

       The happening of an event which is deemed to be an event of default
within the meaning of Sections 5.1 or 5.2 ("Event of Default") shall give rise
to the right in the non-defaulting party to exercise remedies pursuant to
Section 5.3.

       5.1    DEFAULT BY MAXCOM.

                     IF MAXCOM, DUE TO ANY REASON WHATSOEVER,

       (iii)  fails to make payments in accordance with Article 4., or

       (iv)   makes use of the Acquired Capacity or the Optioned Capacity in any
              manner other than as agreed to under the Capacity Sale Agreement,

       then Metro Net may notify Maxcom in writing of such failure, setting out
in such notice the details of amounts considered to be due but unpaid, or the
nature of the non-complying use, the date or dates upon which the non-complying
use occurred and the remedy required by Metro Net for cure. If Maxcom fails to
cure (i) the non-payment as to which notice is given within 10 (ten) days after
its receipt of the corresponding notice, or (ii) the non-complying use as to
which notice is given within 30 (thirty) days after its receipt of the
corresponding notice, then an Event of Default shall be deemed to have occurred.
Metro Net shall have the right to collect interest on any unpaid amount at the
rate equal to the sum of the London Interbank Offering Rate as published by the
Wall Street

                                        7

<PAGE>   35

Journal on the date of the invoice as to which payment is due, plus 10(ten)
percentage points.

         5.2      DEFAULT BY METRO NET.

         If Metro Net fails to (a) maintain the insurance  coverage  pursuant to
Article 7 hereof,  or (b) satisfy its obligation to render the Services pursuant
to the terms of this Maintenance  Agreement due to any reason,  other than Force
Majeure, including but not limited to:

       (iii)  the commencement of a voluntary case or other proceeding seeking
              liquidation, reorganization or other relief with respect to Metro
              Net under any bankruptcy, insolvency or other similar Law now or
              hereafter in effect or seeking the appointment of a trustee,
              receiver, liquidator, custodian, or other similar official of it
              or any substantial part of its property, or Metro Net shall
              consent to any such relief or to the appointment of or taking
              possession by any such official in an involuntary case or other
              proceeding commenced against it, or shall make a general
              assignment for the benefit of creditors, or shall fail generally
              to pay its debts as they become due, or shall take any corporate
              action to authorize any of the foregoing; or

       (iv)   the commencement of an involuntary case or other proceeding
              against Metro Net seeking liquidation, reorganization or other
              relief with respect to it under any bankruptcy, insolvency or
              other similar Law now or hereafter in effect or seeking the
              appointment of a trustee, receiver, liquidator, custodian or other
              similar official for it or any substantial part of its property,
              and such involuntary case or other proceeding shall remain
              undismissed and unstayed for a period of 45 (forty five) days; or
              an order for relief shall be entered against such party; or

       (v)    the seizure, revocation, cancellation and/or reversion of any or
              all of the Acquired Capacity or any Optioned Capacity; or

       (vi)   failure to maintain in full force and effect the Concession
              throughout the Term and guarantee Maxcom's rights to use without
              any interference or limitation the Acquired Capacity and any
              Optioned Capacity pursuant to the terms of the Capacity Sale
              Agreement;

       then Maxcom may notify Metro Net in writing of such failure, setting out
in such notice the nature of the failure, the date or dates upon which the
failure occurred. If Metro Net fails to cure such failure within 30 (thirty)
days of such notice, then an Event of Default shall be deemed to have occurred.

       Notwithstanding the foregoing, if Metro Net does not cure the failure
within 30 (thirty) days of notice Maxcom may, but is not obligated to, correct
the failure or cause third parties to do so, and Metro Net will be obligated to
reimburse Maxcom for all reasonable costs incurred by it in effecting such
correction, and the right to correct the

                                        8

<PAGE>   36

failure and to receive reimbursement therefor shall be in addition to all other
remedies under this Agreement.

       5.3    REMEDIES. Upon the occurrence of an Event of Default by Maxcom,
Metro Net shall have the right, exercisable at its sole discretion, to terminate
this Agreement as provided in Article 6 and to exercise any remedies available
at Law, provided, however, that a remedy exercised by Metro Net under this
Agreement due to the non-complying use of the Acquired Capacity may not be
exercised by Metro Net under the Capacity Sale Agreement.

       Upon the occurrence of an Event of Default by Metro Net, Metro Net and
Maxcom agree that the terms and conditions of the Inter Owner Agreement shall
immediately enter into effect, in the understanding that Maxcom shall have the
right, at its sole discretion, to exercise any remedies available at Law as
provided in Article 6.

       Metro Net acknowledges that the Services and other considerations to be
provided by Metro Net hereunder are unique and irreplaceable, and that the
Maxcom shall therefore be entitled to a decree ordering the specific performance
of Metro Net's obligations hereunder. Metro Net waives any defenses that it may
have to an entry of any such order. In case of an Event of Default, and
notwithstanding the foregoing, the defaulting party agrees to use its Best
Efforts to take such action as the other may require to mitigate the effect of
the default hereunder by covering damages incurred by the affected party. The
exercise by a party of any remedy available to it shall be without prejudice to
other remedies which may be available and shall not be deemed a waiver of any
other such remedy.

                                    ARTICLE 6
                              TERM AND TERMINATION

       6.1    TERM. This Agreement shall be effective for the Term, unless
earlier terminated as follows:

       (a)    at the election of Metro Net, on the happening of an Event of
              Default with respect to Maxcom;

       (b)    at the election of Maxcom, if there occurs an event of Force
              Majeure (as defined below) which results in an Outage for a period
              of 30 (thirty) or more consecutive days; or

       (c)    at the election of Maxcom, on the happening of an Event of Default
              with respect to Metro Net.

       6.2    CONTINUING EFFECT. The provisions of this Agreement shall continue
to bind the parties and inure the termination for such time and to such extent
as is necessary to give effect to a party's respective rights and obligations
hereunder.

                                        9

<PAGE>   37

              If Maxcom elects to terminate this Agreement on the happening of
an Event of Default, the parties agree that the operation and maintenance of
Maxcom's Network shall be carried out pursuant to the terms and conditions of
the Inter Owner Agreement. The parties agree that this Agreement shall continue
in effect until Maxcom has negotiated an agreement with the Interim Operator (as
defined in the Inter Owner Agreement) to undertake the operation and maintenance
under Industry Standards similar to those herein provided.

                                    ARTICLE 7
                                    INSURANCE

       7.1    COVERAGE. During the Term, Metro Net shall obtain and maintain in
force, and shall ensure that any subcontractor obtains and maintains in force,
comprehensive general liability insurance, public liability coverage and
property insurance for injury to persons and property, automobile liability
insurance, and workmen's compensation insurance, all with respect to the DF
Network, Maxcom's Network and the performance of the Services with a minimum
insurance coverage of US$8,000,000.00 (Eight Million US Dollars) per event under
terms which are generally carried by operators of networks similar to the DF
Network.

       7.2    MAXCOM INTERESTS. Maxcom shall be named as an additional insured
on such policies, and the same shall provide that no termination of the policy
may occur without prior notice to Maxcom. Insurance proceeds shall be primarily
applied to the reconstruction or replacement of the DF Network, including
Maxcom's Network.

                                    ARTICLE 8
                               DISPUTE RESOLUTION

       8.1    DISPUTE RESOLUTION BY MANAGEMENT.

       8.1.1 The parties shall attempt in good faith to resolve or curb any
matter or dispute or difference of whatever nature howsoever arising under, out
of, or in connection with this Agreement (a "Dispute") by mutual agreement in
accordance with this Article 8. before initiating any legal action or attempting
to enforce any rights or remedies hereunder (including termination), regardless
of whether this Article 8. is referenced in the provision of this that is the
basis for any such Dispute

       8.1.2 Any party wishing to resolve or cure a Dispute may give notice
thereof to the other party. Within 5 (five) days of receipt of such notice, the
parties' representatives shall meet to discuss the Dispute and attempt in good
faith and using their best endeavors at all times to resolve the Dispute and
produce written terms of settlement.

       8.1.3 If within 15 (fifteen) days of receipt of the notice referred to in
Section 8.1.2 above, the parties' representatives are unable to resolve or cure
such Dispute, the Dispute shall be referred to senior officers of the parties
for resolution or cure. Such senior officers shall meet to discuss the Dispute
and attempt in good faith and using their best endeavors at all times to resolve
the Dispute and produce written terms of settlement.

                                       10

<PAGE>   38

       8.1.4 If the Dispute is not resolved as evidenced by the signing of the
written terms of settlement within 30 (thirty) days of receipt of the notice
referred to in Section 8.1.2 above, or such longer period as may be mutually
agreed by the parties, the provisions of Section 8.2 shall apply and shall
provide the exclusive forum for resolving a Dispute, provided, however, that
nothing contained in this Article 8. shall be construed as preventing a party
from seeking preventive judicial measures or relief before a court of competent
jurisdiction.

       8.2    ARBITRATION.

       8.2.1 Where any Dispute is not resolved as provided for in Section 8.1,
then the Dispute shall be resolved by an arbitration tribunal (the "Tribunal")
in accordance with this Section 8.2.

       8.2.2 The arbitration shall be conducted in accordance with the
arbitration rules of the Rules of Arbitration of the Arbitration Center of
Mexico ("CAM") as in force at the time such arbitration is commenced (the "CAM
Arbitration Rules").

       8.2.3 The place of arbitration shall be Mexico City, Mexico, or any other
place mutually agreed to by the parties to the Dispute and the arbitration
proceedings shall be conducted in the English language.

       8.2.4 The award rendered shall be in writing and shall set forth in
reasonable detail the facts of the Dispute and the reasons for the Tribunal's
decision and shall apportion the costs of the arbitration.

       8.2.5 The award rendered in any arbitration commenced hereunder shall be
final and binding, and the arbitral award may be enforced against the parties to
the arbitration proceeding or their assets wherever they may be found and a
judgment upon the arbitral award may be entered in any court having jurisdiction
thereof. In addition, the parties agree that no party shall have any right to
commence or maintain any legal action or proceeding concerning a Dispute until
the Dispute has been determined in accordance with the arbitration procedure
provided for herein and then only to enforce or facilitate the execution of the
award rendered in such arbitration. The parties hereto hereby waive, to the
extent permitted by Law, any rights to appeal or to review of such award by any
court or tribunal.

       8.2.6 Any arbitration award hereunder shall be payable in Dollars with
interest pendente lite and thereafter until actual payment.

       8.3 CONTINUED PERFORMANCE. During the conduct of dispute resolution
procedures pursuant to this Article 8, (i) the parties shall continue to perform
their respective obligation under this Agreement, and (ii) no party shall
exercise any other remedies hereunder arising by virtue of the matters in
dispute.

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<PAGE>   39

                                    ARTICLE 9
                                 INDEMNIFICATION

       9.1    INDEMNIFICATION. The parties shall protect, indemnify, defend and
hold each other harmless, as well as their respective Affiliates and Associates,
against and from any cost, expense, damage, liability, claim or loss, including
reasonable attorneys' and consultants' fees ("Indemnifiable Cost") arising out
of any injury, bodily or otherwise, to, or death of, persons, or for damage to,
or destruction of, property belonging to or leased by either of them or others
(each a "Claim"), resulting from or attributable to the fault or the Negligence
or Misconduct of either of the parties, their respective Affiliates or
Associates or resulting from, arising out of, or in any way connected with the
performance of the Parties' obligations under this Agreement. Metro Net shall
further indemnify and hold harmless, Maxcom and its Affiliates and Associates
from and against any and all liabilities, judgments, claims, settlements,
losses, damages, fees, liens, Taxes, penalties, obligations, and reasonable and
documented expenses incurred or suffered by Maxcom arising out of claims
resulting from, arising out of, or in connection with the operation, maintenance
and management of the DF Network or components owned, operated or managed by
Metro Net, including in each case, product warranty claims, product liability
claims, and claims relating to damages or clean-up costs under any Law or policy
governing environmental or occupational health and safety matters, or founded
upon any private right of action or other third party claim in respect of
environmental or occupational health or safety matters.

       9.2    EMPLOYEES. Neither party nor its Affiliates or Associates shall be
deemed an employee of the other party. Neither party shall bring any claim
against the other party or its Affiliates or Associates with respect to any
liability for compensation under any applicable workmen's compensation Law.

       9.3    NOTICE AND PARTICIPATION.

       9.3.1  If any party entitled to indemnification hereunder (the
"Indemnified Party") intends to seek indemnification under this Article from any
other party (the "Indemnifying Party") with respect to any action or Claim, the
Indemnified Party shall give the Indemnifying Party notice of such Claim or
action upon the receipt of actual knowledge or information by the Indemnified
Party of any possible Claim or of the commencement of such Claim or action,
which notice shall in no event be later than the lesser of (i) fifteen (15) days
prior to the last day for responding to such Claim or action or (ii) one half of
the period allowed for responding to such Claim or action. The Indemnifying
Party shall have no liability under this Article 9. for any Claim or action for
which such notice is not provided, to the extent that the failure to give such
notice prejudices the Indemnifying Party.

       9.3.2  Neither party shall settle any Claim or action with respect to
which either party has sought or intends to seek indemnification pursuant to
this Section without the prior written consent of the other party, which consent
shall not be unreasonably conditioned, withheld or delayed.

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<PAGE>   40

       9.4    NET AMOUNT. In the event that an Indemnifying Party is obligated
to indemnify and hold any Indemnified Party harmless under this Article 9., the
amount owing to the Indemnified Party shall be the amount of such Indemnified
Party's actual out-of-pocket Indemnifiable Cost, net of any insurance or other
recovery actually received by the Indemnified Party.

       9.5    SURVIVAL OF OBLIGATION. The duty to indemnify under this Article
shall continue in full force and effect notwithstanding the expiration or
termination of this Agreement, with respect to any Indemnifiable Cost arising
out of an event or condition which occurred prior to such termination.

                                   ARTICLE 10
                                  FORCE MAJEURE

       10.1   FORCE MAJEURE. A delay in or failure of performance hereunder by
either party shall be excused to the extent caused by Force Majeure, with the
exception of payment obligations. For purposes hereof, "Force Majeure" shall
mean the following events or circumstances, or a combination of such events or
circumstances, which are beyond the reasonable control of a party claiming Force
Majeure and that materially and adversely affects the performance by such
affected party of its obligations under or pursuant to this Agreement, provided
that such material and adverse effect could not have been prevented, bypassed,
overcome, or remedied by the affected party through the exercise of due
diligence and reasonable care or its compliance with Industry Standards, good
industry practice and with the obligations assumed herein: drought, flood,
earthquake, volcanic eruption, fire, landslide, cyclone, typhoon, or tornado, or
other acts of God or declared acts of war, or any actual or constructive
expropriation of any part of the DF Network by any Government Authority. The
foregoing provisions allowing a party to claim excuse due to Force Majeure shall
not relieve such party from using its best efforts to overcome or remove such
Force Majeure. A party claiming such failure or delay shall give prompt notice
thereof to the other party, together with a description of such efforts to
overcome the Force Majeure.

                                   ARTICLE 11
                                  MISCELLANEOUS

       11.1 COUNTERPARTS. This Agreement may be executed in several counterparts
with the same effect as if all parties thereto had signed the same document,
provided that the several counterparts, in the aggregate, shall have been signed
by all of the parties. All such counterparts of this Agreement shall be
construed together and shall constitute one agreement binding upon all the
parties hereto.

       11.2 NOTICES. All notices under this Agreement shall be in writing and
shall be given to the parties entitled thereto at their respective addresses as
herein set forth:

              If to Maxcom:

              Magdalena 211

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<PAGE>   41

              Colonia Del Valle
              Mexico, D.F. 03100
              Mexico
              Attn: Chief Operating Officer
              Phone: 5 147 1200
              Fax: 5 147 8655
              with copy to:
              Legal Department
              Phone: 5 147 1114
              Fax: 5 147 8655

              If Metro Net:

              Michoacan 22-B
              Colonia Condesa
              Mexico, D.F. 06110
              Mexico
              Attn: Ing. Joao Carlos Tello Chapoy
              Phone: 525-264-4403
              Fax: 525-574-8122

       or at such other address as any of the parties may hereafter specify in
the same manner. Unless delivered personally, such notices shall be given by
recognized international courier. Notices shall be deemed to have been received,
and shall be effective, upon receipt. Notices of changes of address by any party
shall be made in writing within 10 (ten) days of the effective date of such
change.

       11.3 AMENDMENT. No amendment or modification of this Agreement shall be
effective unless (i) such amendment or modification is reduced to writing as
signed by the parties; and (ii) amended or modified in accordance with Law.

       11.4 WAIVER OF TERMS AND CONDITIONS. Any waiver as to any of the terms or
conditions of this Agreement in one instance shall not operate as a waiver of
the same terms and conditions or prevent the enforcement of any of the terms and
conditions hereof in any other instance.

       11.5 ASSIGNMENT. Except in the case of an assignment by the parties of
their rights (but not the delegation of its liabilities or obligations)
hereunder to an Affiliate, no party may assign its rights or delegate its
obligations under this Agreement to any third party unless express consent
thereto has been given by the other party. Notwithstanding any other provision
hereof, no party may assign its interests hereunder during a Dispute. As
specific performance by the original parties is of the essence of this
Agreement, such consent may be given or declined in the sole discretion of the
party not seeking to make the assignment.

       11.6 SUCCESSORS AND ASSIGNS. All the rights, benefits, duties,
liabilities and obligations of the parties hereto shall inure to the benefit of
and be binding upon their respective successors and permitted assigns.

                                       14

<PAGE>   42

       11.7 APPLICABLE LAW. This Agreement is executed in accordance with and is
intended to be construed under the Laws of Mexico.

       11.8 PROPRIETARY INFORMATION.

       11.8.1 Any Proprietary Information of a party (the "Disclosing Party")
which is disclosed to or otherwise received or obtained by the other party (the
"Receiving Party") incident to this Agreement is disclosed, and shall be held,
in confidence, and the Receiving Party shall not publish or otherwise disclose
any Proprietary Information (as hereinafter defined) to any Person for any
reason or purpose whatsoever, or use any Proprietary Information for its own
purposes or for the benefit of any Person, without the prior written approval of
the Disclosing Party, which approval may be granted or withheld by the
Disclosing Party in its sole discretion. Each party's obligation to maintain
Proprietary Information in confidence shall be deemed performed if such party
observes, with respect thereto, the same safeguards and precautions which such
party observes with respect to its own proprietary information of the same or
similar kind.

       11.8.2 The term "Proprietary Information" means all information, written
or oral, which has been or is disclosed by the Disclosing Party, or by any
Person in a confidential relationship with the Disclosing Party, or which
otherwise becomes known to the Receiving Party, or to any Person in a
confidential relationship with the Receiving Party, and which (x) relates to
matters such as patents, trade secrets, research and development activities,
draft or final contracts or other business arrangements, books and records,
budgets, cost estimates, pro forma calculations, engineering work product,
environmental compliance, vendor lists, suppliers, manufacturing processes,
energy consumption, pricing information, private processes, and other similar
information, as they may exist form time to time, or (y) the Disclosing Party
expressly designates in writing to be confidential. However, Proprietary
Information shall exclude information falling into any of the following
categories:

              a)  information that, at the time of disclosure hereunder, is in
                  the public domain, other than information that entered the
                  public domain by breach of this or any other agreement, or in
                  violation of any Law;

              b)  information that, after disclosure hereunder, enters the
                  public domain, other than information that entered the public
                  domain by breach of this or any other agreement, or in
                  violation of any Law;

              c)  information, other than that obtained from third parties, that
                  prior to disclosure hereunder, was already in the recipient's
                  possession, either without limitation on disclosure to others
                  or subsequently becoming free of such limitation;

              d)  information obtained by the recipient from a third party
                  having an independent right to disclose the information; or

              e)  information that is available through independent research
                  without use of or access to the Proprietary Information.

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<PAGE>   43

       11.8.3 Each party agrees that it will make available Proprietary
Information received from another party to its Affiliates, consultants, legal
advisors and Associates only on a need-to-know basis, and that all Persons to
whom such Proprietary Information is made available will be made aware of the
confidential nature of such Proprietary Information, and will be required to
agree to hold such Proprietary Information in confidence under terms
substantially identical to the terms hereof.

       11.8.4 Nothing herein shall limit the right of the Receiving Party to
provide any Proprietary Information to any Government Authority having
jurisdiction over or asserting a right to obtain such information, provided that
(i) such Government Authority requires or orders that such Proprietary
Information be provided, and (ii) the Receiving Party promptly advises the
Disclosing Party of any request for such information by such Government
Authority and cooperates in giving the Disclosing Party an opportunity to
present objections, requests for limitation, and or requests for confidentiality
or other restrictions on disclosure or access, to such Government Authority.

       11.8.5 In the event of a breach or threatened breach of the provisions of
Section 11.8.1 above by any Receiving Party, the Disclosing Party shall be
entitled to an injunction restraining such party from such breach. Nothing
contained herein shall be construed as prohibiting the Disclosing Party from
pursuing any other remedies available for such breach or threatened breach of
this Agreement.

       11.8.6 The obligation to retain information in confidence shall continue
in full force and effect during the term of this Agreement and for a period of
10 (ten) years thereafter, notwithstanding the expiration or termination of this
Agreement, with respect to any information obtained by any party prior to such
termination.

       11.9 SEVERABILITY. If any provision of this Agreement shall be determined
to be unenforceable, void or otherwise contrary to Law, such condition shall in
no manner operate to render any other provision of this Agreement unenforceable,
void or contrary to Law and this Agreement shall continue in force in accordance
with the remaining terms and provisions hereof, unless such condition
invalidates the purpose or intent of this Agreement. In the event that any of
the provisions, or portions or applications thereof, of this Agreement are held
unenforceable or invalid by any court of competent jurisdiction, the parties
shall negotiate in good faith to attempt to implement an equitable adjustment in
the provisions of this Agreement with a view toward effecting the purposes of
this Agreement by replacing the provision that is unenforceable, void, or
contrary to Law with a valid provision the economic effect of which comes as
close as possible to that of the provision that has been found to be
unenforceable, void, or contrary to Law.

       11.10 EXPENSES; TAXES. Each of the parties hereto shall pay all of its
own Taxes and bear its own costs and expenses incurred in connection with their
performance under this Agreement.

       11.11 INTEGRATION. There are no understandings between the parties as to
the subject matter of this Agreement other than as set forth herein, and this
Agreement, together with the Capacity Sale Agreement, the Inter Owner Agreement
and the Master Services Agreement (as amended) represent the entire
understanding between the parties in relation

                                       16

<PAGE>   44

to the subject matter hereof. This Agreement supersedes any and all previous
agreements, including any arrangements or discussions between the parties
(whether written or oral) in respect of the subject matter hereof, all of which
are hereby abrogated and withdrawn.

       11.12 SURVIVAL. The applicable provisions of this Agreement shall
continue in effect after the expiration of the term of this Agreement, to the
extent necessary to provide for final billing and adjustment, and to make other
appropriate settlements hereunder.

       11.13 PRESS RELEASES and Publicity. Neither party shall issue any press
release or make any public announcement relating to the subject matter of this
Agreement without the prior written approval of the other party.

       11.14 NO THIRD PARTY BENEFICIARIES. This Agreement shall not confer any
rights or remedies upon any Person other than the parties and their respective
successors and permitted assigns.

       11.15 RELATIONSHIP OF THE PARTIES. Neither party nor its Affiliates and
Associates shall be deemed, by virtue of such party's execution of this
Agreement to be an affiliate, Associate, contractor, vendor, representative,
joint venturer, member or partner of the other party or its Affiliates and
Associates, and a party may not hold itself out as such.

       11.16 LANGUAGE. The language of this Agreement and of all agreements
between the parties shall be English unless otherwise agreed to by the parties
in writing. To the extent permitted by Law, the English version of this
Agreement and of all agreements between the parties shall prevail over the
translation thereof into any other language.

       11.17 FURTHER ASSURANCES. Metro Net and Maxcom shall execute and deliver
any and all additional instruments, papers, deeds, contratos, documents and
other assurances, and shall do any and all acts and things as may be necessary
or appropriate to consummate the transactions contemplated by this Agreement and
to carry out the intention of the parties.

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

              MAXCOM TELECOMUNICACIONES, S.A. DE C.V.

              By:
                 -------------------------
              Name: Ing. Gian Carlo Pecchioni
              Title: Chief Executive Officer

              METRO NET, S.A. DE C.V.

              By:
                 -------------------------
              Name: Ing. Joao Carlos Tello Chapoy
              Title: Chief Executive Officer

                                       17

<PAGE>   45

                                                                       EXHIBIT B

        ACCEPTANCE PROTOCOL FOR FIBER OPTICS OUTSIDE PLANT SPECIFICATIONS

This exhibit summarizes the criteria that Maxcom shall apply upon the
acquisition of any Acquired Capacity under the Capacity Sale Agreement.

AERIAL CONSTRUCTION

1.   The distance between the poles should not exceed 50 meters, unless required
     due to the presence of obstacles or restrictions imposed by permits.

2.   The poles should not be curved more than provided for in the manufacturer's
     specifications.

3.   The wood poles should not have cracks with a separation larger than 3mm,
     with a length larger than 1.5 m and a depth larger than 1/4 diameter of the
     section.

4.   The minimum height of the cables above the poles should be according to the
     following situation:

<TABLE>
<CAPTION>
------------------------------------------------------- -----------------------------------------------------
                      SITUATION                                         MINIMUM FREE HEIGHT
------------------------------------------------------- -----------------------------------------------------
<S>                                                   <C>

------------------------------------------------------- -----------------------------------------------------
                                                        6.0 METERS +/- 5 %
STREET CROSSING
------------------------------------------------------- -----------------------------------------------------
                   ALONG THE STREET                     5.0 METERS +/- 5 %
------------------------------------------------------- -----------------------------------------------------
FFCC CROSSING                                           9.0 METERS +/- 5 %
------------------------------------------------------- -----------------------------------------------------
                   HIGHWAY CROSSING                     9.0 METERS +/- 5 %
------------------------------------------------------- -----------------------------------------------------
</TABLE>

5.   The placement of the poles, should be accord of the following:

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------
          LENGHT                  NORMAL TERRAIN          HARD TERRAIN OR ROCK     DIAMETER OF THE POLE IN
          ------                                                                           THE BASE
-------------------------------------------------------------------------------------------------------------
<S>                               <C>                        <C>                      <C>
            25'                       1.20 m                     1.15 m                   18 A 22 cm
-------------------------------------------------------------------------------------------------------------
            30'                       1.30 m                     1.20 m                   20 A 25 cm
-------------------------------------------------------------------------------------------------------------
            35'                       1.40 m                     1.25 m                   24 A 29 cm
                                                                                          ----------
-------------------------------------------------------------------------------------------------------------
            40'                       1.50 m                     1.35 m                   25 A 29 cm
                                                                                          ----------
-------------------------------------------------------------------------------------------------------------
            45'                       1.60 m                     1.45 m                   26 A 32 cm
                                                                                          ----------
-------------------------------------------------------------------------------------------------------------
</TABLE>

                                        1

<PAGE>   46

6.   Place tension hardware when direction changes.

7.   In straight sections, tension hardware will generally be installed on a
     basis of one per three suspension hardware, it being understood that the
     tension hardware may be placed as infrequently as one per five suspension
     hardware,

8.   Terrain and permits allowing, tension hardware will be placed between pole
     and pole when exceeding the regular distance.

9.   Place tension hardware when the cable goes down a connection or to a
     splicing box.

10.  When the cable descends a pole, must be protected with a galvanized pipe of
     2", 3" or 4" diameter, and 3 meters in length.

11.  Place neoprene protectors in the sections where the cable has possible
     grazing with tree branches, existing cables, advertisements or obstacles
     that can harm it.

UNDERGROUND CONSTRUCTION

12.  The location of the manholes should be as follows:

-    Avoid risks to the construction or maintenance personnel.

-    Provide security to the workers in regards to the car traffic.

-    Do not affect entrances and avoid the obstruction of load and unload areas.

-    Optimize the lengths of the cables to be installed.

-    Facilitate the immersion operations of the cables.

-    Allow the performance of construction splices or maintenance.

13.  In the splice and derivation manholes leave 20 meters of cable end in order
     to plot the cable and install the splicing box.

14.  In the splice and derivation manholes the splicing box will be fasten to
     the hole walls and to the slacks as well

15.  It should be respected the minimum radio of curvature of 20 times the
     external diameter of the cable to avoid Fiber damage.

16.  Permits and terrain allowing, the manholes will be placed to a regular
     distances of 300 meters, fluctuating a maximum distance of 500 meters and a
     minimum of150 meters.

17.  When the route changes direction of 90 degrees build a manhole.

                                        2

<PAGE>   47

18.  The ducts should fulfill the following rules:

-    Wall thickness according to the astm d3485-nematc7 rule
-    Schedule according to the astm d2447-nematc2 rule

19.  The PVC tube used will be totally dielectric, in order to avoid
     electrolytic corrosion effects.

20.  The attenuation losses of the Fiber Optic cable installed along the network
     should not exceed the following:

-    For the 1310 nm window the attenuation is 0.4 dB/km.
-    For the 1550 nm window the attenuation is 0.3 dB/km.

21.  According to the above-mentioned, the parameters will rule the results of
     the measurements to be carried out on the field.

22.  In regards to the splices carried out along the network, the mean
     attenuation of such splices should not be larger than 0.05 dB.

                                        3

<PAGE>   48

                                                                       EXHIBIT C

AGREEMENT AMONG OWNERS OF CAPACITY ON METRONET'S METROPOLITAN NETWORK
("AGREEMENT"), DATED APRIL 28, 2000, AMONG METRO NET, S.A. DE C.V. ("METRO NET")
AS OPERATOR OF ITS FIBER OPTIC NETWORK AS PRESENTLY OR SUBSEQUENTLY CONSTITUTED,
AND CONVERGENCE COMMUNICATIONS, INC. AND MAXCOM TELECOMUNICACIONES, S.A. DE C.V.
AS OWNERS OF CAPACITY ON THE NETWORK ("PRESENT OWNERS"), PURSUANT TO THE
FOLLOWING FACTS AND CIRCUMSTANCES:

       A.     Metro Net has developed, owns and operates a fiber optic network
in Mexico City ("DF Network"), pursuant to that certain concession granted by
the Mexican Ministry of Communications and Transportation, dated July 5, 1997.

       B.     Metro Net has entered into certain capacity sale agreements with
each of the Present Owners pursuant to which the Present Owners have acquired
fiber optic capacity in the DF Network.

       C.     Metro Net has entered into certain maintenance agreements with
each of the Present Owners pursuant to which the Metro Net maintains the fiber
optic capacity acquired by the Present Owners in the DF Network.

       D.     Metro Net and the Present Owners wish to establish an arrangement
for the exercise by the Present Owners, and owners of capacity on the DF Network
that may subsequently become parties to the Agreement (together with the Present
Owners here referred to as "Owners"), of rights to cause the DF Network to be
maintained and operated in the event of default by Metro Net of any of its
separate obligations to the Owners under the capacity sale agreements or the
maintenance agreements (either an "Event of Default").

              NOW THEREFORE, in consideration of the mutual obligations, herein
contained, the parties agree as follows:

              FIRST. SEPARATE AGREEMENTS. Each Owner may negotiate and maintain
in force its separate agreement or agreements with Metro Net for the acquisition
of capacity and for the maintenance of its fiber optic capacity in the DF
Network according to the standards and terms and conditions as are mutually
agreeable to the Owner and Metro Net (each a "Separate Agreement"); in the
understanding, however, that no such agreement may provide for an Owner to have
any right to take control or operate the DF Network, including, without
limitation, on the happening of an Event of Default. The parties' intention
under this Agreement is that at all times while any Owner is an Owner of
capacity in the DF Network, the DF Network shall either be operated by Metro Net
or pursuant to this Agreement.

                                        1

<PAGE>   49

              To the extent that any Separate Agreement presently in effect
grants to a Present Owner any right to control or operate the DF Network, the
Present Owner and Metro Net will amend the agreement to delete the provision
providing such right.

              Metro Net commits not to enter into any agreement that grants to
any Owner of capacity, whether a party to this Agreement or not, any right to
control or operate the DF Network, or to amend any agreement to provide such
right.

              SECOND. EVENTS OF DEFAULT. On the happening of an Event of Default
under any Separate Agreement, the Owner observing the default will notify each
other Owner and Metro Net of the happening of the default. Such notice will be
given as promptly as practicable, but in any event prior to the Owner's exercise
of its any right that triggers the termination of Metro Net's rights and
obligations under the Separate Agreement related to the maintenance and
operation the DF Network.

                     Upon the exercise by any Owner of such right , the Owner
exercising such right will be deemed to be authorized by the other Owners, and
by Metro Net, to cause an interim independent operator to undertake the
maintenance and operation of the DF Network, for the benefit of all the Owners
("Interim Operator"). The Interim Operator shall be selected among the list of
possible operators attached hereto as Annex "A". The list of possible operators
in Annex "A" may be amended to remove or add any operators as required from time
to time by agreement of the Owners; in the understanding, however, that each
possible operator listed in Annex "A" must meet, at the time of its inclusion,
the most stringent standards as are specified in any Separate Agreement then in
effect, and provided further that Telefonos de Mexico, S.A. de C.V. (or any
affiliate) may not be selected as an Interim Operator.

              The selection of the Interim Operator may be changed from time to
time by agreement of the Owners. The maintenance and operation of the DF Network
by the Interim Operator shall meet the most stringent standards as are specified
in any Separate Agreement then in effect. Until the Interim Operator agrees to
undertake such maintenance and operation according to such standards, Metro Net
shall continue to manage and operate the DF Network.

              THIRD. PERMANENT OPERATION. Within 15 (fifteen) business days
following the installation of the Interim Operator, the Owners shall meet to
discuss the selection of an entity to maintain and operate the DF Network (the
"Permanent Operator"), which entity may itself be the Interim Operator, another
operator listed in Annex "A" or an Owner, in the understanding that Telefonos de
Mexico, S.A. de C.V. (or any affiliate) may not be selected as a Permanent
Operator. The selection process of the Permanent Operator shall be carried out
within a period of 45 (forty five) business days following the installation of
the Interim Operator. The appointment and removal of the Permanent Operator may
be changed from time to time by agreement of the Owners.

              Among themselves, the Owners shall, select one of them to
negotiate with

                                        2

<PAGE>   50

the Permanent Operator the terms and conditions of a maintenance agreement,
which shall provide that the Permanent Operator shall meet the most stringent
standards as are specified in any Separate Agreement so long as the same is in
effect. When such agreement has been negotiated and confirmed by all the Owners
as meeting the requirements set out in this Agreement, the function of the
Interim Operator shall cease and the agreement with the Permanent Operator will
be in effect. In other respects, the terms and conditions of the agreement with
the Permanent Operator will be commercially reasonable.

              The majority vote of all the Owners shall be required to adopt any
decision under this Inter Owner Agreement. Each Owner shall have one vote for
each fiber-kilometer of fiber optic in the DF Network that it has a right to
use.

              FOURTH. METRO NET'S PREFERENTIAL RIGHT. Metro Net and the Owners
agree that if Metro Net is able to conclusively cure the Event of Default which
triggered the entering into effect of this Inter Owner Agreement, then the
Owners may vote to replace the Interim Operator or the Permanent Operator, as
the case may be, and appoint Metro Net to resume the operation and maintenance
of the DF Network. In any event and whenever possible to guarantee the optimal
and efficient operation and maintenance of the DF Network, Metro Net shall have,
under similar conditions, a preferential right over other possible operators to
be appointed as Interim Operator or Permanent Operator, as the case may be.

              FIFTH. RELATIONSHIP AMONG OWNERS. The Owners agree to act at all
times in good faith in the relationship and interaction among them and to adopt
decisions in such manner to guarantee the optimal and efficient operation and
maintenance of the DF Network for the benefit of all Owners.

              SIXTH. COST. The cost of the services of the Interim Operator and
the Permanent Operator shall be allocated among all the Owners, pro rata based
on the number of fiber-kilometer of fiber optic that each Owner has a right to
use.

              SEVENTH. METRO NET REPRESENTATION AND WARRANTY. Metro Net hereby
represents and warrants that as of the date of execution hereof that there are
no Owners other than the Present Owners.

              EIGHTH. SUBSEQUENT OWNERS. Owners that enter into Separate
Agreements from time to time after the effective date of this Agreement will be
admitted as parties to this Agreement by executing an adherence letter to the
terms and conditions of this Agreement. Subsequent Owners will become parties to
this Agreement in the terms then in effect and no additional rights may be
granted to such subsequent Owner unless all Owners then parties to this
Agreement agree and such right is available to all Owners. Metro Net shall give
each Owner a 15 (fifteen) day prior notice of any subsequent Owner's adherence
to this Agreement specifying the number of fiber-kilometer of fiber optic such
subsequent Owner has acquired.

                                        3

<PAGE>   51

              NINTH. DISPUTES. The parties shall attempt in good faith to
resolve or curb any matter or dispute or difference of whatever nature howsoever
arising under, out of, or in connection with this Agreement (a "Dispute") by
mutual agreement before initiating any legal action or attempting to enforce any
rights or remedies hereunder (including termination). Where any Dispute is not
resolved through negotiation, then the Dispute shall be resolved by an
arbitration tribunal (the "Tribunal") in the terms provided herein.

              The arbitration shall be conducted in accordance with the
arbitration rules of the Rules of Arbitration of the Arbitration Center of
Mexico ("CAM") as in force at the time such arbitration is commenced (the "CAM
Arbitration Rules"). The Laws of Mexico with respect to arbitration procedures
shall not apply to the arbitration or to the arbitration award, except to the
extent the award is required to be enforced in Mexico.

              The place of arbitration shall be Mexico City, Mexico, or any
other place mutually agreed to by the parties to the Dispute and the arbitration
proceedings shall be conducted in the English language. The award rendered shall
be in writing and shall set forth in reasonable detail the facts of the Dispute
and the reasons for the Tribunal's decision and shall apportion the costs of the
arbitration.

              The award rendered in any arbitration commenced hereunder shall be
final and binding, and the arbitral award may be enforced against the parties to
the arbitration proceeding or their assets wherever they may be found and a
judgment upon the arbitral award may be entered in any court having jurisdiction
thereof. In addition, the parties agree that no party shall have any right to
commence or maintain any legal action or proceeding concerning a Dispute until
the Dispute has been determined in accordance with the arbitration procedure
provided for herein and then only to enforce or facilitate the execution of the
award rendered in such arbitration. The parties hereto hereby waive, to the
extent permitted by Law, any rights to appeal or to review of such award by any
court or tribunal.

              During the conduct of dispute resolution procedures pursuant to
this Clause, (i) the parties shall continue to perform their respective
obligation under this Agreement, and (ii) no party shall exercise any other
remedies hereunder arising by virtue of the matters in dispute.

              TENTH. NOTICES. All notices under this Agreement shall be in
writing and shall be given to the parties entitled thereto at their respective
addresses as herein set forth:

              If Metro Net:

              Michoacan 22-B
              Colonia Condesa
              Mexico, D.F. 06110
              Attn: Ing. Joao Carlos Tello Chapoy

                                        4

<PAGE>   52

              Phone: 525-264-4403
              Fax: 525-574-8122

              If to Convergence Communications, Inc.:

              102 West 500 South
              Suite 320
              Salt Lake City, Utah 84101
              Attn: Troy D'Ambrosio
              Phone: 1-801-328-5618
              Fax: 1-801-532-6060

              If to Maxcom:

              Magdalena 211
              Colonia Del Valle
              Mexico, D.F. 03100
              Attn: Chief Operating Officer
              Phone: 5 147 1200
              Fax: 5 147 8655
              with copy to:
              Legal Department
              Phone: 5 147 1114
              Fax: 5 147 8655

              or at such other address as any of the parties may hereafter
specify in the same manner. Unless delivered personally, such notices shall be
given by recognized international courier. Notices shall be deemed to have been
received, and shall be effective, upon receipt. Notices of changes of address by
any party shall be made in writing within 10 (ten) days of the effective date of
such change.

              AMENDMENT. No amendment or modification of this Agreement shall be
effective unless (i) such amendment or modification is reduced to writing as
signed by the parties; and (ii) amended or modified in accordance with Law.

              WAIVER OF TERMS AND CONDITIONS. Any waiver as to any of the terms
or conditions of this Agreement in one instance shall not operate as a waiver of
the same terms and conditions or prevent the enforcement of any of the terms and
conditions hereof in any other instance.

              ASSIGNMENT. Except in the case of an assignment by the parties of
their rights (but not the delegation of its liabilities or obligations)
hereunder to an affiliate, no party may assign its rights or delegate its
obligations under this Agreement to any third party unless express consent
thereto has been given by all other parties to this Agreement. Notwithstanding
any other provision hereof, no party may assign its interests hereunder during a
Dispute. As specific performance by the original parties is of the essence of
this

                                        5

<PAGE>   53

Agreement, such consent may be given or declined in the sole discretion of the
party not seeking to make the assignment.

              SUCCESSORS AND ASSIGNS. All the rights, benefits, duties,
liabilities and obligations of the parties hereto shall inure to the benefit of
and be binding upon their respective successors and permitted assigns.

              APPLICABLE LAW. This Agreement is executed in accordance with and
is intended to be construed under the Laws of Mexico.

              SEVERABILITY. If any provision of this Agreement shall be
determined to be unenforceable, void or otherwise contrary to law, such
condition shall in no manner operate to render any other provision of this
Agreement unenforceable, void or contrary to law and this Agreement shall
continue in force in accordance with the remaining terms and provisions hereof,
unless such condition invalidates the purpose or intent of this Agreement. In
the event that any of the provisions, or portions or applications thereof, of
this Agreement are held unenforceable or invalid by any court of competent
jurisdiction, the parties shall negotiate in good faith to attempt to implement
an equitable adjustment in the provisions of this Agreement with a view toward
effecting the purposes of this Agreement by replacing the provision that is
unenforceable, void, or contrary to law with a valid provision the economic
effect of which comes as close as possible to that of the provision that has
been found to be unenforceable, void, or contrary to law.

              EXPENSES; TAXES. Each of the parties hereto shall pay all of its
own taxes and bear its own costs and expenses incurred in connection with the
negotiation and preparation of this Agreement and with meeting the conditions
required to be satisfied.

              INTEGRATION. There are no understandings between the parties as to
the subject matter of this Agreement other than as set forth herein, and this
Agreement represents the entire understanding between the parties in relation to
the subject matter hereof. This Agreement supersedes any and all previous
agreements, including any arrangements or discussions between the parties
(whether written or oral) in respect of the subject matter hereof, all of which
are hereby abrogated and withdrawn.

              PRESS RELEASES AND PUBLICITY. Neither party shall issue any press
release or make any public announcement relating to the subject matter of this
Agreement without the prior written approval of the other parties.

              NO THIRD PARTY BENEFICIARIES. This Agreement shall not confer any
rights or remedies upon any Person other than the parties and their respective
successors and permitted assigns.

              RELATIONSHIP OF THE PARTIES. Neither party nor its affiliates and
associates shall be deemed, by virtue of such party's execution of this
Agreement to be an affiliate, associate, contractor, vendor, representative,
joint venturer, member or partner of the other party or its affiliates and
associates, and a party may not hold itself out as such.

                                        6

<PAGE>   54

              LANGUAGE. The language of this Agreement and of all agreements
between the parties shall be English unless otherwise agreed to by the parties
in writing. To the extent permitted by Law, the English version of this
Agreement and of all agreements between the parties shall prevail over the
translation thereof into any other language.

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

              METRO NET, S.A. DE C.V.

              By:
                 -------------------------
              Name: Ing. Joao Carlos Tello Chapoy
              Title: Chief Executive Officer

              CONVERGENCE COMMUNICATIONS, INC.

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

              MAXCOM TELECOMUNICACIONES, S.A. DE C.V.

              By:
                 -------------------------
              Name: Ing. Gian Carlo Peccioni
              Title: Chief Executive Officer

                                        7

<PAGE>   55

                ANNEX A TO AGREEMENT AMONG OWNERS OF CAPACITY ON
                         METRONET'S METROPOLITAN NETWORK

       The following companies shall be considered as possible operators to
undertake the maintenance and operation of the DF Network:

       -    Ericsson

       -    Nortel Networks

       -    Alcatel

       -    Lucent Technologies

       -    NK Cables, Limited

<PAGE>   56

                                                                       EXHIBIT D

April 28, 2000

Alejandro Martinez Alvarez
Maxcom Telecomunicaciones S.A. de C.V.
Magdalena 211
Colonia del Valle
Mexico D.F. 03100

Dear Mr. Martinez:

In accordance with the terms of the Capacity Sale Agreement (Metropolitan
Network Capacity Sale Agreement) executed by and between Metro Net, S.A de C.V.
("Metro Net") and Maxcom Telecomunicaciones S.A. de C.V. ("Maxcom") dated April
28, 2000 ("Capacity Sale Agreement"), it is necessary to modify some rights and
obligations that Metro Net and Maxcom have under the Master Agreement for the
Rendering of Telecommunication Services and Signaling Conduction executed by and
between Metro Net and Maxcom on May 18, 1999 ("Master Services Agreement"). The
new terms and conditions that shall rule the relationship between the parties
under the Master Services Agreement are set below. Except for the amendments
provided in this letter, the rest of the clauses of the Master Services
Agreement shall remain in full force and effect in their terms. Capitalized
terms and not otherwise defined herein shall have the meaning ascribed to them
in the Master Services Agreement.

I.     By virtue of the fiber optic capacity acquired by Maxcom under the
       Capacity Sale Agreement, Metro Net acknowledges that Maxcom has fulfill
       all its obligations under the Master Services Agreement of a CTCA of 650
       (six hundred fifty) Circuits Years.

II.    From the date of this letter, Maxcom will be entitled to receive the
       maximum level of discounts that Metro Net offers. Maxcom will be entitled
       to receive the maximum level of discounts that Metro Net will offer for a
       period of 5 (five) years following the First Closing, in the terms of the
       Capacity Sale Agreement.

III.   Following the 5 (five) years period mentioned above, the parties agree
       that per each US$1,000,000.00 (One million dollars 00/100 United States
       Currency) (or fraction that exceeds more than half) of fiber optic
       capacity acquired by Maxcom from Metro Net under the Capacity Sale
       Agreement Maxcom will be entitled to add 200 Circuits Year to the amount
       of the capacity used by Maxcom at such time for the calculation of the
       discounts provided by Metro Net according to its tariffs book.

IV.    In accordance with applicable laws and regulations, from this date and
       for a period of 5 (five) years counting from the First Closing in terms
       of the Capacity

                                        1

<PAGE>   57

       Sale Agreement, Maxcom agrees to use Metro Net as preferential supplier
       of optic fiber connections to final users in the metropolitan are of
       Mexico City. Metro Net must offer such connections with competitive
       prices. Maxcom shall not be obliged to use Metro Net to perform such
       connections if Maxcom determines reasonably, at its sole discretion, that
       the terms and conditions that Metro Net offers are not competitive or if
       the final user requests Maxcom to use some other company.

V.     The parties foresee that the conversion of the Premises of the Final User
       in a POP under the Capacity Sale Agreement shall require the anticipated
       termination of outstanding Work Orders before their expiration date. In
       such cases, Maxcom will be entitled to early terminate any outstanding
       Work Order, without penalty or any responsibility, in the understanding
       that the term then current pending to pass for its termination, shall be
       added to other Work Orders that Maxcom determines at its sole discretion.

If you agree with the terms and conditions set forth in this letter, we request
your signature and the delivery of such executed copy to our offices.

Sincerely,

Joao Carlos Tello Chapoy
Metro Net, S.A. de C.V.

Agreed and accepted as of April 28, 2000.

Alejandro Martinez Alvarez
Maxcom Telecomunicaciones S.A. de C.V.

                                        2

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