<PAGE>

                                EXHIBIT 10.19


                       INSTALLATION CONTRACTOR AGREEMENT


   AGREEMENT (the "Agreement") made on this _____ day of September, 1997, by
and between CS Wireless Systems, Inc., a Delaware corporation having its
principal place of business at 200 Chisholm Place, Suite 202, Plano, Texas
75075 (the "Company") and ACS Telecommunications Systems, Inc. ("ACS"), a
Delaware corporation having its principal place of business at 65 West Street
Road, Suite A-100, Warminster, PA, 18974 ("Contractor").

                                 WITNESSETH

   WHEREAS, Company desires to have certain work performed by Contractor in
connection with its wireless television systems in the Dallas, Texas
vicinity (the "Initial System") and such other markets as mutually agreed to
by Company and Contractor (each such additional System defined as the
"Additional System" and each particular System defined as a "System");

   WHEREAS, Contractor desires and is able to perform such task upon the
terms and conditions hereafter set forth;

   NOW, THEREFORE, the parties hereto, intending to be legally bound hereby
agree to the following:

   1.  THE WORK

   Contractor agrees to perform in accordance with the specifications set
   forth in EXHIBIT A in a good and workmanlike manner the services
   described on EXHIBIT B, which services shall be collectively referred to
   as the "Work".  Contractor and Company shall mutually agree on the
   specifications for performance of work with respect to each Additional
   System and the term of such specifications shall be incorporated into an
   addendum which shall be attached and made a part of this Agreement.
   Payments required to be made to Contractor pursuant to SECTION 7 shall
   be with respect to the Work.  In the event that Company desires that
   Contractor provide additional services which are not set forth on
   EXHIBIT A or EXHIBIT B, Company and Contractor shall agree upon the
   terms and conditions, including compensation, for such additional
   services.  Notwithstanding anything in this Agreement to the contrary,
   compensation for such additional services shall not be included in the
   calculation of Additional Market Fees, as prescribed by Exhibit B.

   2.  INDEPENDENT CONTRACTOR

   Contractor shall furnish all labor, transportation, tools and equipment,
   other than customer premises equipment to be installed at a customer's
   location, necessary to

INSTALLATION CONTRACTOR AGREEMENT                                    PAGE 1
<PAGE>

   perform the Work.  Contractor shall ensure that (i) its personnel,
   sufficient in number and training, arrive at all Work Sites (defined in
   SECTION 17) designated by the Company and perform the Work, and (ii) its
   personnel are available to receive and address customer calls. It is
   specifically contemplated and agreed between the parties hereto that
   Contractor shall perform the Work as an independent contractor as that
   term is defined under applicable law. Other than as may be otherwise
   provided herein, Contractor alone shall hire, fire, direct, supervise
   and pay its employees.

       2.1  Contractor will not, directly or indirectly, act as an agent,
       servant, or employee of Company, or make any commitments or incur
       any liabilities on behalf of Company.

       2.2  All personnel assigned by Contractor to perform the Work will be
       employees or subcontractors of Contractor.  Contractor shall be wholly
       and solely responsible for all federal and state income taxes,
       withholding taxes, social security taxes, workers' compensation
       insurance, employee benefits and all reporting and filings associated
       with any of the foregoing.

   3.  TERM

   The term of  this Agreement will commence on the date signed and shall
   continue in force for two (2) years, or until earlier terminated by
   either party in accordance with the terms hereof.

   4.  COMPLIANCE WITH LAWS

       4.1 The Work shall be constructed and completed by the Contractor in
       strict compliance with all applicable laws, ordinances, rules,
       regulations and agreements including, without limitation, those
       established by the Federal Communications Commission; the Federal
       Aviation Administration; National Institute of Safety and Health; the
       National Electric Safety Code; the Occupational Safety and Health
       Administration; the Immigration Reform and Control Act of 1984; and all
       other entities or agencies having jurisdiction over Contractor or the
       Work or any aspect thereof.

       4.2  Company shall have the right, but not the duty, to enter upon any
       Work site and to conduct inspections of the Work at any time, to ensure
       compliance with this Agreement. If any deficiencies are noted, Company
       may require immediate remedial and curative measures.

       4.3  Company requires Contractor to have in effect and regularly monitor
       a safety program that is in compliance with the requirements and
       guidelines of all agencies listed in SECTION 4.1.   In lieu of a
       specific program, Contractor may agree in writing to adhere to all
       safety policies described in Company's safety manual.

INSTALLATION CONTRACTOR AGREEMENT                                    PAGE 2
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   5.  EMPLOYEES OF CONTRACTOR

       5.1  Contractor will employ only skilled, trained and competent
       employees and, upon request of Company, will dismiss such employees as
       Company may deem incompetent.  Contractor shall have a competent
       supervisor who (i) may be contacted at all times, (ii) is acceptable to
       Company, and (iii) shall have the authority to act for Contractor in all
       matters pertaining to the Agreement.  Contractor will, at all times,
       conduct its operations in such a manner that its actions will not
       jeopardize Company's relations with the public and governmental agencies
       in the geographic areas in which Company does business.  The officers of
       Contractor shall give the Work such personal supervision as is deemed
       necessary by Company to ensue that all Work is properly prepared and
       carried out in accordance with Company specifications and scheduled to
       ensure a good and workmanlike job.

       5.2  To the extent Contractor employs others, it agrees to comply with
       the Equal Employment Opportunities ("EEO") provisions of The Cable
       Communications Policy Act of 1984 and the Company's EEO Program which
       require Contractors to seek the broadest recruitment base in order that
       a representative cross section of employees might be obtained.  It is
       Company's policy to afford equal employment opportunity to qualified
       individuals regardless of their race, color, religion, sex, national
       origin, age, non-disqualifying physical or mental handicap, or who are
       disabled veterans or veterans of the Vietnam War, and to conform
       employment practices to applicable laws and regulations.

       5.3  Contractor shall maintain such policies regarding attire, uniforms,
       and appearance as necessary to ensure an appearance of all of its
       personnel suitable for the prosecution of the Work.

       5.4  Contractor shall be responsible for the transportation of its
       personnel to all Work sites and Company warehouse locations.

   6.  SCHEDULE

   Time is of the essence with respect to Contractor's performance of its
   obligations pursuant to this Agreement.  Contractor shall commence Work
   within seven (7) days after a notice to commence is given by Company and
   shall thereafter diligently prosecute the Work in accordance with the
   schedule for completion set forth in EXHIBIT A. If, in the opinion of
   Company, in order to maintain the schedule for completion set forth in
   EXHIBIT A it becomes necessary for Contractor's employees to work after
   regular working hours and/or to increase the size of its work force,
   Contractor shall take such steps without additional cost to Company, or
   Company at its option, may hire such additional personnel as it deems
   necessary and as provided for in SECTION 11 hereof.

INSTALLATION CONTRACTOR AGREEMENT                                   PAGE 3
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   7.  PAYMENT

       7.1  Company shall pay Contractor for the Work to be performed hereunder
       at the rates set forth in EXHIBIT B.  The Monthly Service Fee (described
       in EXHIBIT B) shall be payable in advance commencing on the date first
       set forth above and continuing thereafter on the 15th day of each month,
       unless such date is a holiday or weekend day, in which event payment
       shall be made on the next business day. Payment for the Work shall be
       made within seven (7) days of receipt of an invoice from Contractor.
       Prior to issuance of an invoice, the form and substance of same shall be
       reviewed and mutually agreed to by duly authorized representatives of
       Contractor and Company. Company will advise Contractor of any defects in
       workmanship and materials (other than customer premises equipment
       furnished by Company) and Contractor will remedy such defects as
       provided for in SECTION 10 hereof.

       7.2  In the event that this Agreement is terminated by either party for
       any reason, Company will have sixty (60) days to pay the final invoice
       to ensure compliance with EXHIBIT A, subject to such rights of offset or
       recoupment Company may have.

       7.3  In recognition of the right of the parties hereto to charge-back
       one another with respect to certain services, call responses and
       equipment failures, duly authorized representatives of Company and
       Contractor shall meet daily, either in person or telephonically, to
       discuss and agree upon such charge-backs and adjustments as may be
       reasonably appropriate in light of the circumstances known to the
       parties.  Company and Contractor may agree, from time-to-time, to modify
       the procedures set forth in this SECTION 7.3.

   8.  FORCE MAJEURE

   If the performance by Contractor or Company of any of the provisions of
   this Agreement, other than payment by Company in accordance  with the terms
   hereof, shall be delayed or prevented by governmental order or decree, or
   riot, strike, lockout or other industrial disturbance, fire, flood, acts of
   God (excepting foreseeable weather conditions) or by any other cause beyond
   the control of the Contractor or Company, as the case may be, then the time
   for completion shall be extended until such cause is removed.  Company may
   terminate this Agreement in accordance with SECTION 14 if Contractor's
   performance hereunder is unreasonably delayed by any such event of force
   majeure for more than thirty (30) days.  Contractor may, upon thirty (30)
   days written notice, terminate this Agreement with respect to a System if
   Contractor's performance with respect to such System is unreasonably
   delayed by any such event of force majeure for more than thirty (30) days.

INSTALLATION CONTRACTOR AGREEMENT                                   PAGE 4
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   9.  TRAINING

   Each of the Contractor's employees (and, if applicable, subcontractors
   retained by Contractor to perform all or any part of the Work) shall, at
   the request of Company, attend training and instruction sessions to be
   given by Contractor or Company for the purpose of learning and adhering to
   the specifications set forth in EXHIBIT A attached hereto and made a part
   hereof.   Such training and instruction may include, without limitation,
   universal training and training through third-parties such as Alliance for
   Higher Education.  Company shall be responsible for the cost of preparing
   and making available training materials and facilities.  Contractor shall
   be responsible for all costs associated with the attendance of its
   personnel at all training sessions, including compensation and travel
   expenses.

   10. WARRANTIES

       10.1  Contractor warrants that the Work performed by it will be good and
       workmanlike and free from defects and will conform to Company's
       specifications set forth in EXHIBIT A.  Non-conformity with respect to
       such specifications shall be corrected by Contractor, at its sole
       expense, within forty- eight (48) hours after notice from Company, or
       such longer period (i) as may be necessary to suit the customers
       convenience, (ii) as may be required due to unavailability of materials
       or (iii) due to technical difficulty beyond the control of Contractor.
       Situations resulting with "no pictures" will be addressed immediately
       and resolved within twenty-four (24) hours.  In no case shall any
       problem or complaint go unresolved for more than seven (7) days after
       notice from Company.  Except as expressly provided for herein, for a
       period of three hundred and sixty five (365) days following installation
       (the "Warranty Period") Contractor warrants the workmanship and material
       (except for customer premises equipment furnished by Company) with
       respect to the equipment and materials installed and services provided
       by Contractor pursuant to this Agreement. Contractor will, at its own
       risk and expense, correct any and all faulty workmanship and defects
       made known to it during the Warranty Period.  Company shall be
       responsible for defects in customer premises equipment furnished by
       Company.  Notwithstanding the term of the Warranty Period and
       obligations of Contractor during such period, Company and Contractor
       agree to fairly apportion in a timely manner responsibility for signal
       blockage arising with respect to installations completed during the
       months of November through March.

       10.2  Contractor agrees to accept responsibility for any installation
       related roof leaks reported during a period of one hundred and eighty
       (180) days after the date of final acceptance of the Work by Company.
       All roof leaks and subsequent damage which are not the result of
       substandard workmanship become the sole responsibility of the Company
       after such one hundred and eighty (180) day period elapsed.

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 5
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       10.3  Contractor shall be responsible for damage to all installations
       caused by or arising from any wind related failure, unless such damage
       occurs after the Warranty Period or is directly caused by sustained wind
       forces at the site of the damaged installation exceeding fifty-nine (59)
       miles per hour.

   11. CHANGES AND EXTRAS

       11.1   Company at its option, with ten (10) days notice, may increase or
       decrease the total volume of Work to be performed by Contractor;
       provided, however, that Contractor shall be provided an additional
       thirty (30) days notice for increases or decreases in excess of twenty
       percent (20%) of the average volume for the preceding three (3) months.

       11.2  Contractor shall perform Work for which there is no price included
       in this Agreement whenever it is deemed necessary or desirable by
       Company to complete the project satisfactorily, and such extra Work
       shall be performed in accordance with the specifications and as directed
       by Company's designated  representative. Prior to the commencement of
       any extra Work at the request of anyone other than Company's designated
       representative, Contractor shall obtain a written order from Company.
       No extra Work will be paid for unless (i) ordered by Company's
       designated representative, or (ii) in writing by Company.

       11.3  Extra Work and material will be paid for at unit prices or in a
       lump sum agreed to in writing by Company's representative and the
       Contractor's representative before the extra Work commences.  Payments
       for extra Work will be subjected to the provisions of SECTION 7 hereof.

       11.4  Contractor is the primary installation contractor for Company;
       however, Company reserves the right to perform occasional installations
       (which may, in the aggregate, account for up to ten percent (10%) of all
       installations performed for the benefit of the Company) similar to those
       covered by this Agreement using Company employees.

       11.5  Within three (3) days after receipt of notice of request to
       increase the total volume of Work, Contractor shall advise Company if it
       can or can not perform the additional Work for which notification is
       provided pursuant to SECTION 11.1.  At its option, Company may, but is
       not obligated to, solicit and procure the services of other Contractors
       to perform the additional Work.

   12. DEFAULT BY CONTRACTOR

   If the Contractor (i) shall fail to begin or to prosecute the Work in a
   timely manner under this Agreement; (ii) shall fail to perform the Work
   with sufficient workmen; (iii) shall perform the Work unsatisfactorily;
   (iv) shall neglect or refuse to remove materials; (v) performs the Work
   in such a manner as to cause it to be defective or unsuitable; (vi)
   shall

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 6
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   discontinue the prosecution of the Work without proper cause; (vii) shall
   become insolvent or be declared bankrupt; (viii) shall commit any act of
   bankruptcy or insolvency, (ix) shall make an assignment for the benefits of
   creditors; (x) shall fail to comply with any provisions of the Agreement or
   the Exhibits attached hereto; (xi) for any other reason, shall not carry on
   the Work in an acceptable manner, the Company's designated representative
   shall advise the Contractor of such failure or occurrence, which shall be
   deemed an event of default, and direct the Contractor to correct such
   default.   If the Contractor shall not correct such default within seven
   (7) days after receipt of such notice, the Company may upon written notice
   from Company's designated representative reciting the fact of such default
   and the failure of the Contractor to comply with the directions given in
   such notice, take the prosecution of the Work out of the hands of the
   Contractor, use any raw materials or equipment on the job site or in
   storage as may be suitable and acceptable, enter into agreement with
   another Contractor for the completion of the project, or take such other
   reasonable actions as in the opinion of Company shall be required for the
   completion of the Work.  Company may also elect to terminate this Agreement
   pursuant to SECTION 14.

   13. DEFAULT BY COMPANY; LIQUIDATED DAMAGES

       13.1  If Company does not pay Contractor the full amount due within
       seven (7) days after any date established in the Agreement for payment,
       the Contractor, upon three (3) additional days written notice to
       Company, may stop Work until payment of the amount owing has been
       received.

       13.2  In the event Company terminates this Agreement without cause or
       fails to pay Contractor any sums when due (which failure is not timely
       cured pursuant to SECTION 13.1) within the first twelve (12) months of
       this Agreement, Contractor shall be entitled to receive, in satisfaction
       of any and all claims against Company, liquidated damages equal to the
       product of the minimum monthly payment calculated in accordance with
       EXHIBIT B times twelve (12).

       13.3  In the event Company terminates this Agreement without cause or
       fails to pay Contractor any sums when due (which failure is not timely
       cured pursuant to SECTION 13.1) within the second twelve (12) months of
       this Agreement, Contractor shall be entitled to receive, in satisfaction
       of any and all claims against Company, liquidated damages equal to the
       product of the minimum monthly payment calculated in accordance with
       EXHIBIT B times six (6).

   14. TERMINATION

   Upon (i) the occurrence of a default by Contractor pursuant to SECTION 12,
   which default is not timely cured, or (ii) the expiration of thirty (30)
   days following the occurrence of an event of force majeure which
   unreasonably delays Contractor's performance for such

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 7
<PAGE>


   period, Company may, at its discretion, permanently or temporarily stop
   performance of the Contractor hereunder and terminate this Agreement
   upon five (5) days written notice to the Contractor.  In such event, the
   Contractor shall be paid for all Work completed as of the date specified
   in the notice and which is in compliance with the specifications on
   EXHIBIT A attached hereto.

   15. INSURANCE

       15.1  Contractor and, unless otherwise specified by Company in writing,
       each of Contractor's subcontractors shall obtain and maintain insurance
       with coverage and limits as follows:

          A.  WORKERS COMPENSATION AND OCCUPATIONAL DISEASE INSURANCE: At
          statutory limits as provided by the State of Texas, and Employee's
          Liability Insurance at a limit of not less than Three Hundred
          Thousand Dollars ($300,000.00) for all damages arising from each
          accident or occupational disease.

          B.  COMPREHENSIVE GENERAL LIABILITY INSURANCE: Covering Operations
          and Premises Liability; Contractor's Protective Liability;
          Completed Operations; Product Liability Contractual Liability;
          Personal Injury; Property Damage caused by explosion, collapse and
          underground damage; and Broad-Form Property Damage Endorsement.
          The limits of such liability insurance shall be no less than One
          Million Dollars ($1,000,000.00) combined single limit of liability.
          Also General AGG Coverage in the amount of Two Million Dollars
          ($2,000,000.00) and with a deductible not to exceed Five Hundred
          Dollars ($500.00).

          C.  AUTO LIABILITY: Coverage in an amount no less than One Million
          Dollars ($1,000,000.00) combined single limit.

       15.2  All such insurance shall be carried with companies satisfactory to
       Company and licensed to do business in the jurisdiction where the Work
       hereunder is to be performed, and the policies shall name Company and
       its officers, employees and agents as additional insured parties.

       15.3  CONTRACTOR SHALL NOT COMMENCE WORK UNDER THIS AGREEMENT UNTIL IT
       HAS OBTAINED ALL INSURANCE REQUIRED HEREUNDER AND CERTIFICATES
       EVIDENCING SUCH INSURANCE HAVE BEEN SUBMITTED TO AND APPROVED BY
       COMPANY.  Contractor shall not allow arrangement with anyone for the
       performance of any Work contemplated hereby which does not (i) embody
       the substance of these provisions concerning insurance protection for
       Company and (ii) require the

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 8
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       delivery to Company of certificates evidencing insurance coverage
       required hereunder in form acceptable to the Company in its discretion.

       15.4  Each policy shall provide that it will not be canceled or amended
       except after thirty (30) days advance written notice to Company, mailed
       to the address indicated herein, and the policy, policy endorsement and
       certificate of insurance shall so state.

       15.5  Contractor agrees Company may, from time to time during the term
       of this Agreement, require that additional insurance be obtained and
       maintained in amounts reasonably related to the scope and the nature of
       the construction being undertaken.

       15.6  In the event of any cancellation or any policy change not
       acceptable to Company, Company reserves the right to provide replacement
       insurance coverage and to charge any premium expense therefor to
       Contractor and to deduct such cost from any amounts due or to become due
       to Contractor hereunder.

       15.7  In the event Contractor utilizes subcontractors to perform any of
       the Work, Contractor shall ensure that each subcontractor delivers to
       Company evidence of insurance as satisfactory to Company in its sole
       discretion.

   16. INDEMNIFICATION

       16.1 Contractor shall indemnify, defend and hold harmless Company, its
       employees and agents, from and against:

       A. All mechanics' and material suppliers' liens and all costs,
       attorneys' fees and expenses incurred in connection with any such liens
       which arise by reason of or are related to the Work or any part thereof,
       except customer premises equipment furnished by Company; and

       B. All claims, liability, fines, penalties, damages, losses, costs,
       expenses, actions, suits, judgments and executions (including but not
       limited to attorneys' fees) arising out of or in connection with any of
       the following:

           (i) Any injury, damage or loss to persons (including, without
           limitation, injury to Contractor's employees) or property,
           occurring during, arising from or in connection with: a) the Work;
           or b) the entry upon or possession of the Work site by Contractor,
           any agents, employees, invitees of Contractor or any other person
           for whom Contractor is responsible except for customer premises
           equipment furnished by Company; or

           (ii) The failure of Contractor to perform the Work in accordance
           with the Agreement or the Exhibits attached hereto.

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 9
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       16.2  Company shall indemnify, defend and hold harmless Contractor, its
       employees and agents, from and against:

       A. All mechanics' and material suppliers' liens and all costs,
       attorneys' fees and expenses incurred in connection with any such liens
       which arise by reason of or are related to customer premises equipment
       furnished by Contractor; and

       B. All claims, liability, fines, penalties, damages, losses, costs,
       expenses, actions, suits, judgments and executions (including but not
       limited to attorneys' fees) arising out of or in connection with any
       injury, damage or loss to persons (including, without limitation, injury
       to Company's employees) or property, occurring during, arising from or
       in connection with the customer premises equipment furnished by Company.

       16.3 One party's liability to the other for any of the matters set forth
       in this SECTION 16 shall not be limited by the insurance policies
       required hereunder or the recovery of any amount thereunder.

   17. PROTECTION OF PROPERTY; CLEANING UP AND RESTORATION

   Contractor shall properly protect the equipment and the property where
   all Work is to be done and Contractor shall take all necessary
   precautions for the safety of the employees and its personnel on the
   Work Sites; for the purpose of this Agreement, Work Site is defined to
   be the interior and exterior of any of any building or house at which
   Work is performed and the adjacent real property.  Contractor shall at
   all times keep all Work Sites and premises adjoining where it is
   performing Work, driveways and streets clear of rubbish caused by
   Contractor's operations, and at completion of the Work shall remove all
   its tools, equipment, temporary work and surplus materials.  In all
   events any Work Site shall be left clean and restored to the condition
   prior to the commencement of construction. If Contractor does not attend
   to such cleaning or restoration within two (2) days after request,
   Company may cause such cleaning or restoration to be done by others and
   charge the costs of the same to Contractor.

   18. MISCELLANEOUS

       18.1 This Agreement, including any and all attached Exhibits, contains
       the entire Agreement between Company and Contractor.  There are no other
       agreements or understanding stated or implied except as contained
       herein. Contractor acknowledges the Company has not made any promises of
       Work or volume of Work other than those which are specifically set forth
       in this Agreement.  This Agreement may not be modified or amended except
       by a written instrument executed by the parties hereto.

INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 10
<PAGE>

       18.2  Any specific provision of the Exhibits shall prevail over any
       contradictory provision of this Agreement.

       18.3  This Agreement shall be binding upon the heirs, executors,
       successors, administrators, and assigns of the parties hereto.  This
       Agreement may not be assigned by Contractor in whole or part,
       voluntarily or by operation of law, without the prior written consent of
       Company.  Company may terminate this Agreement upon any transfer of the
       ownership or control of the Company's business or substantially of the
       assets of Contractor; provided, however, this Agreement shall be binding
       on the purchaser of any System, or combination of System which
       constitute less than substantially all of the assets of the Company.

       18.4  Any notice given under this Agreement shall be in writing, and
       shall be transmitted by personal delivery; by overnight courier; by
       registered or certified mail, return receipt requested, postage prepaid;
       or by telecopier and addressed to the other party at the following
       address:

If addressed to the CONTRACTOR:

                ACS Telecommunications Systems, Inc.
                65 West Street Road, Suite A-100
                Warminster, PA 18974
                Attn:  Alan Sonnenberg
                Telecopier No. (215) 956-2456

With copy to:   ACS Telecommunications Systems, Inc.
                Route 5, Box 101-A15
                Sherman, Texas 75092
                Attn:  Ron Jones
                Telecopier No. (903) 891-3054

If Addressed to the COMPANY:

                CS Wireless Systems, Inc.
                200 Chisholm Place
                Suite 202
                Plano, Texas 75075
                Attention:  Frank Hosea
                Telecopier No. (972) 422-5624

With copy to:   CS Wireless Systems, Inc.
                1101 Summit Avenue
                Plano, Texas 75074
                Attention:   Tom Walsh
                Telecopier No. (972) 398-1112


INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 11
<PAGE>

or to such other address as either party may specified.

       18.5  Contractor understands and hereby agrees that the laws of the
       State of Texas shall to the extent legally permissible govern the Work
       to be performed hereunder and the provisions of this Agreement.

       18.6  The captions in this Agreement are for convenience and reference
       only and shall not in any way affect the meaning or interpretation of
       the Agreement.

       18.7  Any waiver by Company or Contractor of any default hereunder shall
       not be effective unless in writing and duty executed, and in no event
       shall constitute a waiver of any other default or breach of the
       Agreement.

   IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date set forth above.

ACS TELECOMMUNICATIONS SYSTEMS, INC.


By: /s/  Alan Sonnenberg                        DATE:  September 23, 1997
    ---------------------------------
    Name:  Alan C. Sonnenberg
    Title: Chief Executive Officer


ATTEST:
        -----------------------------


CS WIRELESS SYSTEMS, INC.


By  /s/  David E. Webb                          DATE:  September 23, 1997
    ---------------------------------
    Name: David E. Webb
    Title: Chief Executive Officer


ATTEST:
        -----------------------------
        Frank H. Hosea


INSTALLATION CONTRACTOR AGREEMENT                                 PAGE 12