EXHIBIT 99.7
                             AMENDMENT NO. 1 TO
                            MODIFICATION AGREEMENT


            AMENDMENT NO. 1 TO MODIFICATION AGREEMENT dated as of April 29,
1997 (this "Amendment") among CAI Wireless Systems, Inc., a Connecticut
corporation ("CAI"), the subsidiaries of CAI listed on the signature pages
hereto (collectively with CAI, the "Company"), BANX PARTNERSHIP, a Delaware
general partnership ("BANX"), MMDS HOLDINGS, INC., a Delaware corporation
("MMDS Holdings"), MMDS HOLDINGS II, INC., a Delaware corporation ("MMDS
Holdings II"), NYNEX MMDS COMPANY, a Delaware corporation ("NYNEX MMDS"), and
NYNEX MMDS HOLDING COMPANY, a Delaware corporation ("NYNEX MMDS Holding";
capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to such terms in the Modification Agreement).

                                   RECITALS

            1.    The Company and BANX, MMDS Holdings, MMDS Holdings II, NYNEX
MMDS and NYNEX MMDS Holding are parties to the Modification Agreement dated as
of December 12, 1996, pursuant to which the parties modified their contractual
arrangements under the Securities Purchase Agreement and the BR Agreement and
with respect to the Purchased Securities.

            2.    The Company and BANX, MMDS Holdings, MMDS Holdings II, NYNEX
MMDS and NYNEX MMDS Holding desire to further modify their contractual
arrangements under the Securities Purchase Agreement and the BR Agreement and
with respect to the Purchased Securities, as set forth herein.

            Accordingly, the parties hereby agree as follows:

            Section 1. LAPSE AND SUSPENSION OF BUSINESS RELATIONSHIP
                        AGREEMENT.

            (a)   Effective upon the execution and delivery of this Amendment:

                  (i)   the right of NYNEX MMDS and MMDS Holdings to exercise
            options, and the obligations of the Company to perform by the
            specified dates, under the BR Agreement among the Company and NYNEX
            MMDS and MMDS Holdings shall lapse and terminate with no further
            force or effect, and each of the parties thereto shall be relieved
            from their obligations thereunder with the same effect and as if
            the parties to the BR Agreement had never entered into such
            agreement with respect to, solely, the Boston, Pittsburgh, Albany,
            Syracuse and Buffalo Service Areas (the "Lapsed Service Areas").
            The lapse and termination of the BR Agreement with respect to the
            Lapsed Service Areas pursuant hereto supersedes the suspension of
            the BR Agreement contemplated by Section 3 of the Modification
            Agreement; and

                  (ii)  the right of NYNEX MMDS and MMDS Holdings to exercise
            options, and the obligations of the Company to perform by the
            specified dates, under the BR Agreement among the Company and NYNEX
            MMDS and MMDS Holdings shall be suspended and the running of all
            other time periods thereunder shall be tolled with respect to all
            remaining Service Areas contemplated by the BR Agreement (the
            "Suspended Service Areas").  If CAI shall fail to consummate a
            purchase transaction pursuant to Section 1 of the Modification
            Agreement, as amended, the BR Agreement and the rights and
            obligations of the parties, solely with respect to the Suspended
            Service Areas, shall be reinstated automatically and without
            further action of the parties on March 1, 1998, and all time
            periods for performance or the exercise of any rights or
            obligations thereunder, including the right to exercise the options
            by NYNEX MMDS and MMDS Holdings thereunder shall be extended by a
            period equal to the period of suspension of the BR Agreement
            pursuant hereto; provided, that, following the end of the
            suspension period, the parties agree to negotiate in good faith to
            amend the BR Agreement; provided, further, however, that the
            parties are under no obligation to agree to any amendments,
            modifications or waivers of the BR Agreement other than with
            respect to the elimination of the existing "Fulfillment Dates" (as
            defined in the BR Agreement).  The suspension of the BR Agreement,
            and any reinstatement thereof, shall not effect a waiver of any
            rights, obligations or claims of the parties thereto for any period
            prior to such suspension or after such reinstatement and this
            Amendment shall not constitute a consent to any modification of
            such rights, obligations or claims, except as expressly provided
            hereunder.

            (b)   In the event that CAI consummates a purchase transaction
pursuant to Section 1 of the Modification Agreement, as amended, the BR
Agreement shall lapse and terminate with no further force or effect, and each
of the parties thereto shall be relieved from their obligations thereunder with
the same effect and as if the parties to the BR Agreement had never entered
into such agreement with respect to the Suspended Service Areas upon
consummation of such purchase of the Purchased Securities.

            (c)   This Section 1 shall supersede Section 3 of the Modification
Agreement in all respects; provided, however, that for purposes of determining
the period of suspension of the BR Agreement for purposes of Section 1(a)(ii)
above, such period of suspension shall be deemed to have commenced on December
12, 1996.


            Section 2. SUSPENSION OF COVENANTS; LIMITATION ON ADDITIONAL
                        INDEBTEDNESS.

            (a)   Effective upon the execution and delivery of this Amendment,
the covenants contained in Sections 6.2(b) and 6.4(b), (c), (d) and (f) of the
Securities Purchase Agreement, and in Sections 8.5, 8.9, 8.10, 8.19 through
8.22, inclusive, 8.25, 8.27, 8.28, 8.29 and 8.31 of the terms of CAI's Senior
Preferred Stock, together with the corresponding covenants contained in the
Term Notes and the Warrants, shall be suspended, until the earlier to occur of
(A) the consummation of the purchase of the Purchased Securities by CAI or its
designee pursuant to Section 1 of the Modification Agreement, as amended by
this Amendment, in which case, the Warrants shall lapse and be canceled with no
further force or effect upon such purchase, the Term Notes will be canceled by
the holders thereof and returned to CAI, and the certificates representing the
Senior Preferred Stock issued to the holders thereof will be surrendered to CAI
for cancellation, or (B) the Option Expiration Date (as defined below) without
CAI or its designee having consummated the purchase of the Purchased Securities
pursuant to Section 1 of the Modification Agreement, as amended, in which case,
the covenants suspended pursuant hereto shall be reinstated automatically with
no further action of the parties.  Actions taken by CAI during the suspension
period which would otherwise have required consent under the suspended
covenants shall not be deemed to be a breach of such covenants following the
termination of such suspension; but only to the extent of actions completed or
transactions consummated as of the end of the suspension period; provided,
however, that CAI may continue to take actions, ministerial or administrative
in nature, required of CAI subsequent to the suspension period in furtherance
of the actions taken by CAI during the suspension period, which actions shall
not be deemed to be a breach of such covenants following the termination of the
suspension period.

                        (b)   In addition to the suspension of the covenants
            contained in subsection (a)(iii) above, (i) Section 6.2(a) of the
            Securities Purchase Agreement shall be amended to eliminate, during
            the suspension period contemplated hereby, the obligation of CAI to
            provide monthly unaudited statements of income for each of its
            Subsidiaries, and (ii) Section 6.5 of the Securities Purchase
            Agreement shall be amended during the suspension period
            contemplated hereby to read follows:

                        6.5.  Inspection.  From and after the date on which a
                  Notice of Default pursuant to Section 6.2(d) hereof shall
                  have been given by the Company to the Purchaser, the Loan
                  Parties shall permit representatives of the Purchaser to
                  visit and inspect any of their or their respective
                  Subsidiaries' offices or properties, to examine all of their
                  respective books of account, records, reports and other
                  papers, to make copies and extracts therefrom, and to discuss
                  their respective affairs, finances and accounts with their
                  respective officers and independent public accountants (and
                  by this provision each Loan Party authorizes said accountants
                  to discuss the affairs, finances and accounts of the Loan
                  Parties and their respective Subsidiaries), all at such times
                  and as often as may be requested until the default identified
                  in the Notice of Default shall have been cured.

            (c)   In addition to the suspension of the covenants contained in
subsection (a)(iii) above, the following covenants contained in the terms of
the Senior Preferred Stock and the corresponding covenants contained in the
Term Notes and the Warrants shall be amended during the suspension period
contemplated hereby to read as set forth herein (section references are to the
terms of the Senior Preferred Stock, however, all corresponding covenants
contained in the Term Notes and the Warrants shall be similarly amended):

                  (i)   7.4   PARITY OR SENIOR SHARES.  The Company shall not
            authorize, create, designate, issue or sell, or obligate itself to
            authorize, create, designate, issue or sell, any separate class or
            series of Preferred Stock or other equity securities of the
            Company, whether now or hereafter authorized or any instrument
            convertible into or exchangeable for such securities or security,
            with rights, preferences and privileges in any respect on a parity
            with or senior to the Senior Preferred Shares; increase the total
            number of authorized Senior Preferred Shares; or issue Senior
            Preferred Shares in excess of the total number of Senior Preferred
            Shares issued and sold by the Company on the Original Issue Date or
            upon the conversion of the Notes issued under the Purchase
            Agreement or authorize, create, designate, issue or sell any
            instrument or security convertible into or exchangeable for Senior
            Preferred Shares or reclassify any shares of any debt or equity
            securities into Senior Preferred Shares; provided, however, the
            Company may authorize, create, issue or sell any separate class or
            series of Preferred Stock or other equity securities of the Company
            that do not contain the rights, preferences and privileges
            described above, but that have voting rights on a parity with, but
            not senior to, the Common Shares.

                  (ii)  8.1   MAINTENANCE OF EXISTENCE AND CONDUCT OF BUSINESS.
            Solely to the extent necessary to preserve the Spectrum (as defined
            in the Business Relationship Agreement) in the Suspended Service
            Areas (as defined in Amendment No. 1 to the Modification Agreement)
            (the "Suspended Service Area Spectrum"), the Company shall, and
            shall cause each of its Subsidiaries to, (a) preserve and keep in
            full force and effect such entity's corporate or partnership
            existence, as the case may be, and rights and franchises material
            to such entity's business and (b) comply with the provisions of all
            franchises, permits, licenses or other similar authorizations
            relating to such entity's business, including, without limitation,
            the FCC Licenses, Channel Leases and any obligations or agreements
            with respect to signal interference, certifications and permits,
            and all other material agreements, licenses and sublicenses, leases
            and subleases to which it is a party, and will suffer no loss or
            forfeiture thereof or thereunder except for losses or forfeitures
            which in the aggregate would not have a Material Adverse Effect on
            the Suspended Service Area Spectrum.

                  (ii)  8.2.  MAINTENANCE OF BUSINESS RELATIONSHIPS. Solely to
            the extent necessary to preserve the Suspended Service Area
            Spectrum, the Company shall, and shall cause each of its
            Subsidiaries to, maintain and preserve its relationships with
            lessors (including, without limitation, MMDS, MDS, POFS, and ITFS
            lessors and lessors of head-end and antenna sites) and licensors
            and others having business relationships with it.

                  (iii)  8.3  MAINTENANCE OF PROPERTIES. Solely to the extent
            necessary to preserve the Suspended Service Area Spectrum, the
            Company shall, and shall cause each of its Subsidiaries to,
            maintain and keep, or cause to be maintained and kept, their
            respective properties (including without limitation, intellectual
            property and properties acquired in accordance with the terms of
            the Loan Documents) in good repair, working order and condition
            (other than ordinary wear and tear), and from time to time shall
            make or cause to be made all appropriate repairs, renewals and
            replacements thereof, so that the business carried on in connection
            therewith may be properly conducted at all times, except where the
            failure to do so would not have a Material Adverse Effect on the
            Suspended Service Area Spectrum.

                  (iii)  8.4.  MAINTENANCE OF LICENSES AND OTHER MATERIAL
            AGREEMENTS. Solely to the extent necessary to preserve the
            Suspended Service Area Spectrum, the Company shall, and shall cause
            each of the Subsidiaries to, use its best efforts to keep in full
            force and effect all of the FCC Licenses, Channel Leases, any
            obligations or agreement with respect to signal interference,
            certification and permits, and all other material agreements,
            licenses and sublicenses, leases and subleases to which it or any
            of the Subsidiaries is a party or to which it or any of its
            Subsidiaries shall become a party hereafter, except for losses
            thereof which individually or in the aggregate would not have a
            Material Adverse Effect on the Suspended Service Area Spectrum.

                  (iv)  8.8   COMPLIANCE WITH BUSINESS RELATIONSHIP AGREEMENT.
            Solely to the extent necessary to preserve the Suspended Service
            Area Spectrum, the Company shall, and shall cause each of the
            Subsidiaries to, comply with the Business Relationship Agreement.

                  (v)   8.14  OTHER AFFIRMATIVE COVENANTS.  The Company shall
            cause each of its Subsidiaries to comply with this SECTION 8.

                  (vi)  Section 8.16 (INDEBTEDNESS) shall be amended by
            deleting the first word of such section and substituting the
            following in lieu thereof:

            "Except for the Additional Indebtedness (as defined in Section 2(d)
            of Amendment No. 1 to the Modification Agreement), the incurrence
            of which shall preclude CAI's reliance on subsections (g) and (h)
            below, but shall not be deemed to be a breach of such subsection,
            and which indebtedness shall be deemed to be Indebtedness under
            Section 8.16, the"

                  (vii)  Section 8.17 (LIENS) shall be amended by deleting the
            first word of such section and substituting the following in lieu
            thereof:

            "Except to the extent necessary to obtain the Additional Financing,
            the"

                  (viii)  8.18  RESTRICTION ON FUNDAMENTAL CHANGES; ASSET
            SALES.  If required to preserve the Suspended Service Area
            Spectrum, the Company shall not, nor shall it permit any of the
            Subsidiaries to, enter into a Capital Reorganization, alter its
            corporate, capital or legal structure or to enter into any merger,
            or consolidate, or liquidate, wind-up or dissolve itself (or suffer
            any liquidation or dissolution), or convey, sell, lease, sub-lease,
            transfer or otherwise dispose of, in one transaction or a series of
            transactions, all or any part of its business, property or assets,
            whether now owned or hereafter acquired (other than in the ordinary
            course of business), or acquire by purchase, lease or otherwise, in
            one transaction or a series of transactions, all or any part of the
            business, property or fixed assets of, or stock or other evidence
            of beneficial ownership of, any Person (other than purchases or
            other acquisitions of inventory, leases, materials, property and
            equipment in the ordinary course of business) or agree to do any of
            the foregoing at any future time following the reinstatement of the
            Business Relationship Agreement.

                  (ix)  8.23  CONTINGENT OBLIGATIONS.  The Company shall not,
            nor shall it permit any of the Subsidiaries to, directly or
            indirectly, create or become or be liable with respect to any
            Contingent Obligation except:

                        (a)   Contingent Obligations of the Company and the
                  Subsidiaries incurred pursuant to the Loan Documents;

                        (b)   Contingent Obligations resulting from endorsement
                  of negotiable instruments for collection in the ordinary
                  course of business;

                        (c)   Contingent Obligations in respect of operating
                  leases;

                        (d)   intercompany Contingent Obligations with respect
                  to the Company or any other wholly-owned Subsidiary;

                        (e)   Contingent Obligations which the Company elects
                  to treat as Additional Indebtedness and which could then be
                  incurred as Additional Indebtedness under SECTION 8.16
                  hereof;

                        (f)   Contingent Obligations of the Company in respect
                  of assisting the Subsidiaries in providing goods and services
                  in the ordinary course of their respective businesses.

                  For purposes of this SECTION 8.23, the term "Contingent
            Obligations" shall mean any direct or indirect liability,
            contingent or otherwise (i) with respect to any indebtedness,
            lease, dividend or other obligation of another if the primary
            purpose or intent thereof is to provide assurance to the obligee of
            such obligation of another that such obligation of another will be
            paid or discharged, or that any agreements relating thereto will be
            complied with, or that the holders of such obligations will be
            protected (in whole or in part) against loss in respect thereof and
            (ii) with respect to any letter of credit.  Contingent Obligations
            shall include with respect to the Company  or any of the
            Subsidiaries, without limitation, (A) the direct or indirect
            guaranty, endorsement (otherwise than for the collection or deposit
            in the ordinary course of business), co-making, discounting with
            recourse or sale with recourse by the Company or any of the
            Subsidiaries, (B) the obligation to make take-or-pay or similar
            payments if required regardless of non-performance by any other
            party or parties to an agreement, and (C) any liability of the
            Company or any of the Subsidiaries for the obligations of another
            through any agreement (contingent or otherwise) (x) to purchase,
            repurchase or otherwise acquire such obligation or any security
            therefor, or to provide funds for the payment or discharge of such
            obligation (whether in the form of loans, advances, stock
            purchases, capital contributions or otherwise), and (y) to maintain
            the solvency or any balance sheet item, level of income or
            financial condition of another (except as expressly provided in
            herein), if in the case of any agreement described under subclause
            (x) or (y) of this sentence, the primary purpose or intent thereof
            is as described in the preceding sentence.

                  (x)   8.24  CONDUCT OF BUSINESS.  Except as expressly
            provided in the Loan Documents, the Company shall not, nor shall it
            permit any of the Subsidiaries to, engage in any line of business
            except those described in the Company's Transition Report on Form
            10-K for the period ended March 31, 1994 and the activities
            described in Note 2 to the Company's financial statements contained
            in the Company's Quarterly Report on Form 10-Q for the quarter
            ended September 30, 1994 which, in the sole judgment of the
            Purchaser Group, do not violate the MFJ; provided, however, that
            prior to the time that the BR Percentage first exceeds 30%, the
            Company and its Subsidiaries may engage in other business
            activities related to the use of the MMDS Spectrum if (i) they are
            in compliance with all of their obligations hereunder, under the
            other Loan Documents and the documents related to the Anticipated
            Financing, and (ii) such activities will not have a Material
            Adverse Effect on the ability of the Company and the Subsidiaries
            to perform their obligations under the Business Relationship
            Agreement solely to the extent necessary to preserve the Suspended
            Service Area Spectrum.

            (d)   The Company and its Subsidiaries shall be permitted to incur
indebtedness, contingent or otherwise (the "Additional Indebtedness"), in
addition to any and all Indebtedness currently issued and outstanding on the
Stage II Closing Date by the Company and its Subsidiaries, in an aggregate
principal amount not to exceed $50,000,000.  During the period of suspension
contemplated hereby, the Company and its Subsidiaries shall not be permitted to
incur any Indebtedness in excess of the Additional Indebtedness.

            (e)   This Section 2 shall be in addition to Section 5 of the
Modification Agreement, which provides CAI with a limited modification of
certain covenants contained in the Purchased Securities during the period from
December 12, 1996 and ending on the date hereof.  Any actions permitted to be
taken by CAI pursuant to Section 5 of the Modification Agreement during such
period shall not be deemed to be a breach of any of the covenants contemplated
by Section 5 of the Modification Agreement.  Actions taken by CAI during the
suspension period contemplated hereunder which would otherwise have required
consent under the suspended covenants shall not be deemed to be a breach of
such covenants following the termination of such suspension; but only to the
extent of actions completed or transactions consummated as of the end of the
suspension period, provided, however, that CAI may continue to take actions,
ministerial or administrative in nature, required of CAI subsequent to the
suspension period hereunder in furtherance of the actions taken by CAI during
the suspension period hereunder, which actions shall not be deemed to be a
breach of such covenants following the termination of the suspension period.

            Section 3. OPTION TO PURCHASE SECURITIES.  Section 1 of the
Modification Agreement is hereby amended by deleting it in its entirety and
inserting the following in lieu thereof:



                  Section 1. OPTION TO PURCHASE SECURITIES.

                  (a)   BANX and its partners, NYNEX MMDS Holding and MMDS
            Holdings II, hereby grant to CAI or its designee the right and
            option to purchase, at any time through February 28, 1998 (the
            "Option Expiration Date"), all (but not less than all) of the
            Purchased Securities, including all accrued and unpaid dividends
            thereon, for an aggregate purchase price equal to the Purchase
            Price specified below.  The option shall be exercised by written
            notice (the "Option Exercise Notice") to BANX, NYNEX MMDS and MMDS
            Holdings II in accordance with the Securities Purchase Agreement,
            which notice shall identify any designee.  If the Option Exercise
            Notice from CAI includes a request to keep the identity of the
            designee (if any) confidential, the sellers will not publicly
            disclose the designee's identity, until such time as the identity
            of the designee as the purchaser of the Purchased Securities is
            otherwise made public, except as may otherwise be required by any
            applicable law, rule, regulation, court order or requirement of a
            government entity, including without limitation, the rules or
            regulations of any securities exchange.  Upon such exercise, the
            purchase and sale of the Purchased Securities shall occur at the
            offices of NYNEX MMDS Holding in New York City (the "Closing") on
            the date, not later than February 28, 1998, as shall be specified
            by CAI in the Option Exercise Notice, at which closing BANX, NYNEX
            MMDS Holding and MMDS Holdings II shall deliver the certificates or
            other instruments representing the Purchased Securities to CAI or
            its designee (without representation or warranty except as to
            title) against payment of the Purchase Price as provided below, and
            CAI shall deliver such legal opinions, opinions of financial
            advisors and officers' certificates as may reasonably be requested
            by the sellers or as may be customary for transactions of such
            nature, provided that if CAI or its designee is unable to close
            within such period solely due to the document deliveries required
            pursuant to this sentence, then at the election of CAI in writing
            to sellers not less than 2 business days prior to the expiration of
            such period, the cash portion of the Purchase Price may be
            deposited in an interest bearing account and the Junior Preferred
            Stock (as defined below) shall be delivered to Day, Berry & Howard,
            to be held in escrow, for a period of up to thirty (30) days in
            order to permit the purchaser to satisfy such delivery requirements
            and the Closing shall be deemed timely if consummated within such
            30-day period provided the sellers shall be paid all interest
            accrued on such funds during such period in addition to the
            Purchase Price.  The parties will use reasonable efforts to agree
            upon the form of such documents within forty five (45) days after
            the execution of this Agreement; provided, however, that the
            failure of the parties to so agree shall not relieve any party of
            its obligation to deliver the required documents in a form
            reasonably satisfactory to the receiving parties.

                  (b)   PURCHASE PRICE.  (i)  The Purchase Price for the
            Purchased Securities shall consist of (A) $40 million payable in
            immediately available funds at the Closing, and (B) 100,000 shares
            of the Company's Junior Convertible Preferred Stock (the "Junior
            Preferred Stock").  The Junior Preferred Stock will be non-voting
            equity of CAI, having no covenants or governance rights, other than
            as required by the Connecticut Business Corporation Act.  The
            Junior Preferred Stock will be fully participating with, and have
            no dividend preference over, the CAI common stock.  It will have a
            liquidation preference equal to $30 million, in the aggregate.
            Each share of Junior Preferred Stock will be convertible into 25
            shares of CAI common stock (i) at any time from and after the
            transfer of the Junior Preferred Stock by BANX to a third party
            unrelated to BANX or any of its affiliates, or (ii) at any time by
            BANX or its affiliated holders from and after the third anniversary
            of the issuance of the Junior Preferred but only in connection with
            an underwritten sale of the CAI common stock into which the Junior
            Preferred Stock is convertible, for which CAI will grant one demand
            registration right.  At no time shall BANX or any of its affiliates
            be permitted to hold the shares of CAI common stock into which the
            Junior Preferred Stock is convertible; provided, however, BANX may
            hold the CAI common stock contemplated by subsection (ii)(B) below.
            The foregoing summary of the terms of the Junior Preferred Stock is
            qualified in its entirety by the terms of the Junior Preferred
            Stock set forth on Exhibit 3(b)(i) attached hereto.

                  (ii)  CAI further agrees that, so long as BANX is the holder
            of the Junior Preferred Stock, to the extent the market value of
            the CAI common stock into which the Junior Preferred Stock is
            convertible on the Conversion Date (as defined in the terms of the
            Junior Preferred Stock) is less than $14.00 per share (calculated
            as the 20-day trading average immediately prior to the Conversion
            Date), it shall issue to BANX, on the Conversion Date and at CAI's
            sole discretion, either (A) a 10-year subordinated promissory note
            (the "Subordinated Note"), substantially in the form of Exhibit
            3(b)(ii) attached hereto, in a principal amount equal to the
            difference between $35 million and the then market value of the CAI
            common stock into which the Junior Preferred Stock is convertible
            (calculated as set forth above)(such difference, the "Additional
            Consideration"); provided, however, that such principal amount
            shall not exceed $15 million, or (B) that number of shares of CAI
            common stock having a then aggregate market value (calculated as
            set forth above) equal to the Additional Consideration; provided,
            however, that such number of shares shall not exceed 1 million.
            The 10-year Subordinated Note shall bear simple interest at the
            rate of 8 percent per annum, which interest shall be payable in
            kind for the first five years after issuance of the Subordinated
            Note, and payable in cash for years six through ten.  The entire
            principal and any unpaid interest is payable in full at the end of
            year ten.  Default under the Subordinated Note would limited to
            payment defaults, with no cross-default provisions relating to any
            other existing or future CAI indebtedness.  The foregoing summary
            of the terms of the Subordinated Note is qualified in its entirety
            by Exhibit 3(b)(ii).  The parties hereto agree that the provisions
            of this Section 3(b)(ii) are solely for the benefit of BANX, may
            not be assigned or transferred to any other party, and lapse upon
            the transfer of the Junior Preferred Stock by BANX to a third party
            unrelated to BANX.

      Notwithstanding anything to the contrary herein, (i) in the event CAI
      shall fail to consummate the purchase of the Purchased Securities in
      accordance with the terms of this Agreement and without limitation to any
      other remedies of BANX, NYNEX MMDS or MMDS Holdings occasioned by such
      failure, the option to purchase pursuant to this Section 1 shall
      terminate automatically and without further action of the parties, and
      (ii) in the event that an Option Exercise Notice is not delivered on or
      before November 21, 1997, BANX, NYNEX MMDS Holding and MMDS Holdings II
      shall have the right to sell the Purchased Securities free and clear of
      the option granted hereby and the rights of the Company pursuant hereto
      upon twenty (20) days' prior notice to CAI, provided that CAI or its
      designee does not exercise the option in accordance herewith within a
      period of ten (10) days following the date of such notice to CAI.  During
      the option period, CAI shall make commercially reasonable efforts to
      secure the funds required to exercise the option or to otherwise find a
      purchaser for the Purchased Securities.  If CAI engages in discussions or
      negotiations with entities which have an interest in investing in the
      Company, it shall offer such entities the option of acquiring the
      Purchased Securities.  CAI agrees that it shall take no action, (other
      than actions in the ordinary course of its business) the effect of which
      could reasonably expected to make the acquisition of the Purchased
      Securities less attractive to a prospective purchaser.  If CAI obtains
      funds sufficient to acquire the Purchased Securities, it shall use
      commercially reasonable efforts to obtain any consents or other
      authorizations required to permit it to exercise the option hereunder.

            Section 4. AMENDED COVENANTS.  The parties hereto acknowledge that
any reference in the Senior Preferred Stock, Warrants or Term Notes to any of
the covenants contained therein shall refer to such covenants, as amended
hereby, during the suspension period.

            Section 5. Any Common Shares or any stock or securities convertible
into or exchangeable for Common Shares or any other securities having voting
rights equal to the voting rights associated with the Common Shares or any
instrument convertible into or exchangeable for such securities or security
issued during the suspension period that CAI would otherwise be prohibited from
issuing pursuant to the terms of Section 8.20 of the Senior Preferred Stock
(and the corresponding covenant in each of the Warrants and Term Notes) shall
be deemed to have been outstanding immediately after consummation of the Stage
II Closing for purposes of the definitions of Fully-Diluted Common Shares and
Initial Target Share Number, and shall be included in any adjustment to Tier
Conversion Prices (and Tier Prices, in the case of the Warrants).  The
suspension of Section 8.20 shall in no way be deemed to be a suspension of the
conversion and anti-dilution provisions of the CAI Securities, and such
provisions shall apply to any issuance of equity securities having voting
rights equal to the voting rights of the Common Shares or rights to acquire
such equity securities or any instrument convertible into or exchangeable for
such securities or security by CAI during the period of suspension contemplated
hereby.  The parties hereto agree that upon the exercise in full of all CAI
Securities held by BANX immediately after the consummation of the Stage II
Closing entitled, and continues to entitle BANX to acquire not less than 45% of
the common equity of CAI, on a fully-diluted basis, without the payment of
additional consideration, other than the exercise prices under the Warrants.

            Section 6. CS CONSENT RIGHTS; CONVEYANCE OF STOCK.  Section 4 of
the Modification Agreement is hereby amended by deleting subsection (b) thereof
in its entirety (which subsection (b) the parties agree begins with the second
full paragraph of Section 4) and inserting the following in lieu thereof:

                  "(b)  During the option period, BANX and its affiliates party
            hereto hereby grant to CAI an irrevocable proxy for the purposes of
            voting their respective shares of CS Wireless Systems, Inc. ("CS
            Wireless") common stock.

                  CAI will inform BANX if it proposes to exercise the proxy
            granted hereunder.  In the event that CAI does exercise the proxy
            granted hereunder, CAI shall defend, indemnify and hold harmless
            each Indemnitee (as hereinafter defined) from and against any and
            all Claims (as hereinafter defined) arising out of, in connection
            with or as a result of exercise of the proxy."

The remaining provisions of Section 4 shall remain in full force and effect.

            Section 7. MUTUAL RELEASES.  Upon the execution and delivery of
this Amendment, the parties hereto shall execute and deliver the Release,
substantially in the form of Exhibit 7 attached hereto.

            Section 8. REMOVAL OF EQUIPMENT.  Section 6 of the Modification
Agreement is hereby deleted in its entirety.

            Section 9. FURTHER ASSURANCES.  The parties hereto agree to take
all actions necessary or advisable, in the opinion of the party taking such
action, to effect the terms of the provisions hereof.

            Section 10. NO WAIVER.  Failure by either party to insist on strict
performance or observance of any provision of this Amendment or to exercise any
right or remedy shall not be construed as a waiver of any right or remedy with
respect to any existing or subsequent breach or default.  This Amendment shall
not constitute a waiver, compromise or relinquishment of any claims relating to
the BR Agreement or the documentation governing the Purchased Securities.

            Section 11. REPRESENTATIONS AND WARRANTIES.  Each party hereto
represents and warrants to the other party that (a) such party has all
requisite legal power and authority to execute and deliver this Amendment and
to perform its obligations hereunder, (b) the execution, delivery and
performance hereof has been duly authorized by all requisite corporate action
on the part of such party, and (c) this Amendment (i) has been duly executed
and delivered by such party and (ii) subject to the due execution and delivery
of this Amendment by the other party hereto, this Amendment constitutes a
legal, valid and binding obligation of such party, enforceable against it in
accordance with its terms, subject to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws or other laws affecting creditors'
rights generally and subject further to general principles of equity
(regardless of whether such enforceability is considered in a proceeding in
equity or at law).

            Section 12. EFFECT ON AGREEMENTS.  The provisions of this Amendment
shall be narrowly construed in accordance with the express provisions hereof
and except as expressly amended or modified herein, the Modification Agreement
shall  remain in full force and effect in accordance with its respective terms.

            Section 13. MISCELLANEOUS.

            (a)    ENTIRE AGREEMENT.  This Amendment constitutes the entire
agreement between the parties with respect to the subject matter hereof and
supersedes any and all previous agreements, representations and understandings
between the parties hereto with respect to such matters whether oral or in
writing.

            (b)    GOVERNING LAW.  This Amendment shall be governed by and
construed in accordance with the law of the State of New York.

            (c)    SEVERABILITY.  The invalidity or unenforceability of any
provision of this Amendment shall not affect the validly or enforceability of
any other provisions of this Amendment, each of which shall remain in full
force and effect.

            (d)    NO THIRD PARTY BENEFICIARIES.  This Amendment shall be
binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns.  Nothing in this Amendment,
including, without limitation, the Additional Consideration set forth in
Section 3(b)(ii) hereof, shall create or be deemed to create any third party
beneficiary rights in any person not party to this Amendment, except for
certain conversion rights contained in the terms of the Junior Preferred Stock
which shall vest solely in an unrelated third party.

            (e)    AMENDMENTS.  This Amendment may be amended, supplemented or
modified, and any provision hereof may be waived, only pursuant to a written
instrument making specific reference to this Amendment signed by each of the
parties hereto.

            (f)    COUNTERPARTS.  This Amendment may be executed in any number
of counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

      Section 14. REGISTRATION RIGHTS.  The Company covenants and agrees as
follows:

            (a)   DEFINITIONS.  For purposes of this Section 14:

                  (i)  The terms "register," "registered," and "registration"
            refer to a registration effected by preparing and filing a
            registration statement or similar document in compliance with the
            1933 Act, and the declaration or ordering of effectiveness of such
            registration statement or document;

                  (ii)  The term "Registrable Securities" means (1) the Common
            Shares issuable or issued upon conversion of the Junior Preferred
            Stock, and (2) any Common Shares of the Company issued as (or
            issuable upon the conversion or exercise of any warrant, right or
            other security which is issued as) a dividend or other distribution
            with respect to, or in exchange for or in replacement of, such
            Junior Preferred Stock or Common Shares, excluding, however, the
            Common Shares issuable to BANX or its affiliates during the first
            three years following the original date of issuance of the Junior
            Preferred Stock to BANX and its affiliates;

                  (iii)  The number of shares of "Registrable Securities then
            outstanding" shall be determined by the number of Common Shares
            outstanding which are, and the number of Common Shares issuable
            pursuant to then exercisable or convertible securities which are,
            Registrable Securities;

                  (iv)  The term "Holder" means BANX or any of its affiliates 
           (as defined in Rule 12b-2 of the Securities Exchange Act of 1934, as
            amended) then holding the Registrable Securities, or any transferee
            of BANX then holding the Registrable Securities; and

                  (v)  The term "Form S-3" means such form under the 1933 Act as
            in effect on the date hereof or any registration form under the
            1933 Act subsequently adopted by the Securities and Exchange
            Commission ("SEC") which permits inclusion or incorporation of
            substantial information by reference to other documents filed by
            the Company with the SEC.

            (b)   REQUEST FOR REGISTRATION.

                  (i) If the Company shall receive at any time on or after the
            third anniversary of the original issuance of the Junior Preferred
            Stock, a written request from the Holder that the Company file a
            registration statement under the 1933 Act covering the registration
            of the Registrable Securities, then the Company shall, subject to
            the limitations of subsection 14(b)(ii), effect as soon as
            practicable, and in any event within 120 days of the receipt of
            such request, the registration under the 1933 Act of the
            Registrable Securities.

                  (ii)  The Holder shall be permitted to initiate the
            registration request hereunder only if it distributes the
            Registrable Securities covered by the request by means of an
            underwritten offering.  The Holder shall enter into an underwriting
            agreement in customary form with the underwriter(s) selected for
            such underwriting by the Holder, which underwriting agreement shall
            relate to all of the Registrable Securities then held by the
            Holder;  PROVIDED, HOWEVER, if the underwriter advises the Holder
            in writing that marketing factors require a limitation of the
            number of shares to be underwritten, then the Holder shall so
            advise the Company of the underwriter's advice and the number of
            shares of Registrable Securities covered by the request (and
            therefore, the number of shares of Junior Preferred Stock then
            convertible by the Holder in accordance with the terms of such
            Junior Preferred Stock) shall be reduced to that number of shares
            that the underwriter has determined can be underwritten.  The
            Holder acknowledges that such reduction will also reduce the number
            of shares of Junior Preferred Stock that the Holder can convert
            into Registrable Shares at the time such conversion is requested.

                  (iii)  The Company is obligated to effect only one such
            registration pursuant to this Section 14(b); provided, however,
            that, in the event the underwriter has made a determination that
            marketing factors require a limitation of the number of shares to
            be underwritten in accordance with the provisions of subsection
            (ii) above, then the Holder shall be permitted to request
            registration of the remaining Registrable Securities, subject to
            the provisions of this Section 14.

                  (iv)  Notwithstanding the foregoing, if the Company shall
            furnish to the Holder, a certificate signed by the President of the
            Company stating that in the good faith judgment of the Board of
            Directors of the Company, it would be seriously detrimental to the
            Company and its shareholders for such registration statement to be
            filed and it is therefore essential to defer the filing of such
            registration statement, the Company shall have the right to defer
            such filing for a period of not more than 60 days after receipt of
            the request of the Holder; PROVIDED, HOWEVER, that the Company may
            not utilize this right more than once in any twelve month period.

            (c)   OBLIGATIONS OF THE COMPANY.  When required under this Section
            14 to effect the registration of Registrable Securities, the Company
            shall, as expeditiously as reasonably possible:

                  (i)  Prepare and file with the SEC a registration statement
            with respect to such Registrable Securities and use its best
            efforts to cause such registration statement to become effective.

                  (ii)  Prepare and file with the SEC such amendments and
            supplements to such registration statement and the prospectus used
            in connection with such registration statement as may be necessary
            to comply with the provisions of the 1933 Act with respect to the
            disposition of all securities covered by such registration
            statement.

                  (iii)  Furnish to the underwriters such numbers of copies of a
            prospectus, including a preliminary prospectus, in conformity with
            the requirements of the 1933 Act, and such other documents as they
            may reasonably request in order to facilitate the disposition of
            Registrable Securities owned by the Holder.

                  (iv)  Use its best efforts to register and qualify the
            securities covered by such registration statement under such other
            securities or Blue Sky laws of such jurisdictions as shall be
            reasonably requested by the Holders, PROVIDED that the Company
            shall not be required to qualify to do business or to file a
            general consent to service or process in any such states of
            jurisdictions.

                  (v)  Enter into and perform its obligations under an
            underwriting agreement, in usual and customary form, with the
            managing underwriter of such offering.  Each Holder participating
            in such underwriting shall also enter into and perform its
            obligations under such an agreement.

                  (vi)  Notify each Holder of Registrable Securities covered by
            such registration statement at any time when a prospectus relating
            thereto is required to be delivered under the 1933 Act of the
            happening of any event as a result of which the prospectus included
            in such registration statement, as then in effect, includes an
            untrue statement of a material fact or omits to state a material
            fact required to be stated therein or necessary to make the
            statements therein not misleading in the light of the circumstances
            then existing.  The Company reserves the right to suspend the use
            of the registration statement during any period in which the
            Company determines that the prospectus contained therein is not
            true and correct in all material respects or omits to state a
            material fact required to be stated therein or necessary to make
            the statements therein not misleading in the light of the
            circumstances then existing.

            (d)   FURNISH INFORMATION.  It shall be a condition precedent to
the obligations of the Company to take any action pursuant to this Section 14 
with respect to the Registrable Securities of any selling Holder that such 
Holder shall furnish to the Company such information regarding itself, the 
Registrable Securities held by it, and the intended method of disposition of 
such securities as shall be required to effect the registration of such Holder's
Registrable Securities.  Each holder shall enter into such agreements with the
Company with respect to the registration of the Registrable Securities
containing such reps and warranties and covenants as is customary in connection
with the registration of securities under the 1933 Act.

            (e)   EXPENSES OF DEMAND REGISTRATION.  All expenses other than
underwriting discounts and commissions incurred in connection with the
registration, filing and qualifications pursuant to Section 14, including,
without limitation, all registration, filing and qualification fees, printers
and accounting fees, fees and disbursements of counsel for the Company, and the
reasonable fees and disbursements of one counsel for the Holder shall be borne
by the Company; PROVIDED, HOWEVER, that the Company shall not be required to
pay for any expenses of any registration proceeding begun pursuant to this
Section 14 if the registration request is subsequently withdrawn at the request
of the Holder; PROVIDED, further, HOWEVER, that if at the time of such
withdrawal, the Holder has learned of a material adverse change in the
condition, business, or prospects of the Company from that known to the Holder
at the time of its request, then the Holder shall not be required to pay any of
such expenses.

            (f)   INDEMNIFICATION.  In the event any Registrable Securities are
included in a registration statement under this Section 14:

                  (i)  To the extent permitted by law, the Company will
            indemnify and hold harmless each Holder and each person, if any,
            who controls such Holder within the meaning of the 1933 Act,
            against any losses, claims, damages, or liabilities (joint or
            several) to which they may become subject under the 1933 Act,
            insofar as such losses, claims, damages, or liabilities (or actions
            in respect thereof) arise out of or are based upon any of the
            following statements, omissions or violations (collectively a
            "Violation"): (i) any untrue statement or alleged untrue statement
            of a material fact contained in such registration statement,
            including any preliminary prospectus (but only if such is not
            corrected in the final prospectus) contained therein or any
            amendments or supplements thereto, or (ii) the omission or alleged
            omission to state therein a material fact required to be stated
            therein, or necessary to make the statements therein not misleading
            (but only if such is not corrected in the final prospectus);
            PROVIDED, HOWEVER, that the indemnity agreement contained in this
            subsection 14(f)(i) shall not apply to any such loss, claim,
            damage, liability, or action to the extent that it arises out of or
            is based upon a violation which occurs in reliance upon and in
            conformity with written information furnished expressly for use in
            connection with such registration by any such Holder or controlling
            person; PROVIDED, HOWEVER, that the indemnity agreement contained
            in this subsection 14(f)(i) shall not apply to amounts paid in
            settlement of any such loss, claim, damage, liability or action if
            such settlement is effected without the consent of the Company,
            which consent shall not be unreasonably withheld;

                  (ii)  To the extent permitted by law, each selling Holder will
            indemnify and hold harmless the Company, each of its directors,
            each of its officers who has signed the registration statement,
            each person, if any, who controls the Company within the meaning of
            the 1933 Act, any underwriter, any other Holder selling securities
            in such registration statement and any controlling person of any
            such underwriter or other Holder, against any losses, claims,
            damages, or liabilities (joint or several) to which any of the
            foregoing persons may become subject, under the 1933 Act, insofar
            as such losses, claims, damages, or liabilities (or actions in
            respect thereto) arise out of or are based upon any Violation, in
            each case to the extent (and only to the extent) that such
            Violation occurs in reliance upon and in conformity with written
            information furnished by such Holder expressly for use in
            connection with such registration; and each such Holder will pay,
            as incurred, any legal or other expenses reasonably incurred by any
            person intended to be indemnified pursuant to this subsection
            14(f)(ii), in connection with investigating or defending any such
            loss, claim, damage, liability, or action; PROVIDED, however, that
            the indemnity agreement contained in this subsection 14(f)(ii)
            shall not apply to amounts paid in settlement of any such loss,
            claim, damage, liability or action if such settlement is effected
            without the consent of the Holder, which consent shall not be
            unreasonably withheld; PROVIDED, that, in no event shall any
            indemnity under this subsection 14(f)(ii) exceed the gross proceeds
            from the offering received by such Holder.

                  (iii)  Promptly after receipt by an indemnified party under 
            this Section 14(f) of notice of the commencement of any action
            (including any governmental action), such indemnified party will,
            if a claim in respect thereof is to be made against any
            indemnifying party under this Section 14(f), deliver to the
            indemnifying party a written notice of the commencement thereof and
            the indemnifying party shall have the right to participate in, and,
            to the extent the indemnifying party so desires, jointly with any
            other indemnifying party similarly noticed, to assume the defense
            thereof with counsel mutually satisfactory to the parties;
            PROVIDED, HOWEVER, that an indemnified party shall have the right
            to retain its own counsel, with the fees and expenses to be paid by
            the indemnifying party, if representation of such indemnified party
            by the counsel retained by the indemnifying party would involve
            actual or potential differing interests between such indemnified
            party and any other party represented by such counsel in such
            proceeding.  The failure to deliver written notice to the
            indemnifying party within a reasonable time of the commencement of
            any such action, if prejudicial to its ability to defend such
            action, shall relieve such indemnifying party of any liability to
            the indemnified party under this Section 14(f), but the omission so
            to deliver written notice to the indemnifying party will not
            relieve it of any liability that it may have to any indemnified
            party otherwise than under this Section 14(f).

                  (iv)  The obligations of the Company and Holder under this
            Section 14(f) shall survive the completion of any offering of
            Registrable Securities in a registration statement under this
            Section 14.

            (g)   ASSIGNMENT OF DEMAND REGISTRATION RIGHT.  The provisions of
this Section 14 may be assigned by the Holder, but only in connection with a
transfer by the Holder of all of the Junior Preferred Stock originally issued
to BANX or its affiliates by the Company (or all of the Common Shares issued
upon conversion of all of the Junior Preferred Stock originally issued to BANX
or its affiliates).


                IN WITNESS WHEREOF, the parties hereto have executed this
Agreement through their duly authorized representatives on the day and year
first above written.

                              CAI WIRELESS SYSTEMS, INC.

                              By:   /S/
                                 Name: Jared E. Abbruzzese
                                 Title:   Chairman and CEO

                              ROCHESTER CHOICE TELEVISION, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title:   President

                              HAMPTON ROADS WIRELESS, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              EASTERN NEW ENGLAND TV, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              CONNECTICUT CHOICE TELEVISION, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              COMMONWEALTH CHOICE TELEVISION, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              ATLANTIC MICROSYSTEMS, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              HOUSATONIC WIRELESS, INC. SYSTEMS, INC., d/b/a
                                    CAPITAL CHOICE TELEVISION

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President



                              NISKAYUNA ASSOCIATES, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              ONTEO ASSOCIATES, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              NEW YORK CHOICE TELEVISION, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              CAI TRANSACTIONS P, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              CAI TRANSACTIONS W, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              CAI VA TRANSACTIONS, INC.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President


                              CAI CT HOLDINGS CORP.

                              By:   /S/
                                 Name: John J. Prisco
                                 Title: President

                              BANX PARTNERSHIP
                              By:  MMDS Holdings Inc.

                              By:   /S/
                                 Name: Philip R. Marx
                                 Title:   Assistant Secretary


                              By:  NYNEX MMDS Company

                              By:   /S/
                                  Name: Melvin Meskin
                                  Title:  President

                              MMDS HOLDINGS INC.

                              By:   /S/
                                 Name: Philip R. Marx
                                 Title:   Assistant Secretary

                              MMDS HOLDINGS II INC.

                              By:   /S/
                                 Name: Philip R. Marx
                                 Title:  Assistant Secretary

                              NYNEX MMDS COMPANY

                              By:   /S/
                                 Name: Melvin Meskin
                                 Title:  President

                              NYNEX MMDS HOLDING COMPANY

                              By:   /S/
                                 Name: Melvin Meskin
                                 Title:  President