Document:

FORM OF

                             STOCK PURCHASE WARRANT
                             ----------------------

         This STOCK PURCHASE WARRANT ("Warrant") is issued as of the 5th day of
February, 1999, by DIGITAL TRANSMISSION SYSTEMS, INC., a Delaware corporation
(the "Company"), to WI-LAN INC., an Alberta corporation (WI- LAN INC. and any
subsequent assignee or transferee hereof are hereinafter referred to
collectively as "Holder" or "Holders").

                                   AGREEMENT:

         1. Issuance of Warrant; Term. For and in consideration of WI-LAN INC.
purchasing a stock purchase warrant of the Company from Finova Mezzanine Capital
Inc. ("Finova") pursuant to a certain Purchase Agreement between WI-LAN and
Finova (the "Purchase Agreement"), and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Company hereby
grants to Holder the right to purchase 702,615 shares of the Company's common
stock (the "Common Stock"), which the Company represents to equal 10.0% of the
shares of capital stock outstanding on the date hereof, calculated on a fully
diluted basis and assuming exercise of this Warrant. The shares of Common Stock
issuable upon exercise of this Warrant are hereinafter referred to as the
"Shares." This Warrant shall be exercisable at any time and from time to time
from the date hereof until March 1, 2004 (the "Expiration Date").

         2. Exercise Price. The exercise price (the "Exercise Price") per share
for which all or any of the Shares may be purchased pursuant to the terms of
this Warrant shall be One Dollar ($1.00).

         3. Exercise. This Warrant may be exercised by the Holder hereof (but
only on the conditions hereinafter set forth) in whole or in part, upon delivery
of written notice of intent to exercise to the Company in the manner at the
address of the Company set forth in Section 13 hereof, together with this
Warrant and payment to the Company of the aggregate Exercise Price of the Shares
so purchased. The Exercise Price shall be payable, at the option of the Holder,
(i) by certified or bank check, (ii) by the cancellation of all or a portion of
debt outstanding to the Holder from the Company having an outstanding principal
balance equal to the aggregate Exercise Price or (iii) by the surrender of a
portion of this warrant where the shares subject to the portion of this Warrant
that is surrendered have a fair market value equal to the aggregate Exercise
Price. In the absence of an established public market

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for the Common Stock, fair market value shall be established by the Company's
board of directors in a commercially reasonable manner. Upon exercise of this
Warrant as aforesaid, the Company shall as promptly as practicable, and in any
event within fifteen (15) days thereafter, execute and deliver to the Holder of
this Warrant a certificate or certificates for the total number of whole Shares
for which this Warrant is being exercised in such names and denominations as are
requested by such Holder. If this Warrant shall be exercised with respect to
less than all of the Shares, the Holder shall be entitled to receive a new
Warrant covering the number of Shares in respect of which this Warrant shall not
have been exercised, which new Warrant shall in all other respects be identical
to this Warrant. The Company covenants and agrees that it will pay when due any
and all state and federal issue taxes which may be payable in respect of the
issuance of this Warrant or the issuance of any Shares upon exercise of this
Warrant.

         4. Covenants and Conditions. The above provisions are subject to the
following:

                  (a) Neither this Warrant nor the Shares have been registered
under the Securities Act of 1933, as amended ("Securities Act"), or any state
securities laws ("Blue Sky Laws"). This Warrant has been acquired for investment
purposes and not with a view to distribution or resale and may not be sold or
otherwise transferred without (i) an effective registration statement for such
Warrant under the Securities Act and such applicable Blue Sky Laws, or (ii) an
opinion of counsel, which opinion and counsel shall be reasonably satisfactory
to the Company and its counsel, that registration is not required under the
Securities Act or under any applicable Blue Sky Laws (the Company hereby
acknowledges that Burnet, Duckworth & Palmer is acceptable counsel). Transfer of
the Shares shall be restricted in the same manner and to the same extent as the
Warrant and the certificates representing such Shares shall bear substantially
the following legend:

         THE SHARES OF COMMON STOCK REPRESENTED BY THIS CERTIFICATE
         HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
         AMENDED (THE "ACT"), OR ANY APPLICABLE STATE SECURITIES LAW
         AND MAY NOT BE TRANSFERRED UNTIL (I) A REGISTRATION STATEMENT
         UNDER THE ACT AND SUCH APPLICABLE STATE SECURITIES LAWS SHALL
         HAVE BECOME EFFECTIVE WITH REGARD THERETO, OR (II) IN THE
         OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY, REGISTRATION
         UNDER SUCH SECURITIES ACT AND SUCH APPLICABLE STATE
         SECURITIES LAWS IS NOT REQUIRED IN CONNECTION WITH SUCH
         PROPOSED TRANSFER.

The Holder hereof and the Company agree to execute such other documents and
instruments as counsel for the Company reasonably deems necessary to effect the

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<PAGE>

compliance of the issuance of this warrant and any shares of Common Stock issued
upon exercise hereof with applicable federal and state securities laws.

                  (b) The Company covenants and agrees that all shares which may
be issued upon exercise of this Warrant will, upon issuance and payment
therefor, be legally and validly issued and outstanding, fully paid and
nonassessable, free from all taxes, liens, charges and preemptive rights, if
any, with respect thereto or to the issuance thereof. The Company shall at all
times reserve and keep available for issuance upon the exercise of this Warrant
such number of authorized but unissued shares of Common Stock as will be
sufficient to permit the exercise in full of this Warrant.

                  (c) The Company covenants and agrees that it shall not sell
any shares of the Company's capital stock at a price per share below the fair
market value of such shares, without the prior written consent of the Holder
hereof. In the event that the Company sells shares of Common Stock at a price
per share below the fair market value of such shares (a "Below Market
Transaction"), without the prior written consent of the Holder hereof, the
Company covenants and agrees that the number of shares issuable upon exercise of
this Warrant shall be equal to the product obtained by multiplying the number of
shares issuable pursuant to this Warrant prior to the Below Market Transaction
by a fraction, the numerator of which shall be the number of shares of Common
Stock outstanding immediately prior to consummation of the Below Market
Transaction plus the number of shares of Common Stock issued in the Below Market
Transaction, and the denominator of which shall be the number of shares of
Common Stock outstanding immediately prior to the Below Market Transaction plus
the number of shares of Common Stock that the aggregate consideration received
by the Company in the Below Market Transaction would purchase at fair market
value. For purposes of this subsection, Common Stock shall be deemed to include
that number of shares of Common Stock that would be obtained assuming (i) the
conversion of any securities of the Company which, by their terms, are
convertible into or exchangeable for Common Stock, and (ii) the exercise of all
options to purchase or rights to subscribe four Common Stock or securities
which, by their terms, are convertible into or exchangeable for Common Stock. In
the absence of an established public market for the securities sold by the
Company in a Below Market Transaction, fair market value shall be established by
the Company's board of directors in a commercially reasonable manner.

         5. Transfer of Warrant. Subject to the provisions of Section 4 hereof,
this Warrant may be transferred, in whole or in part, to any person or business
entity, by presentation of the Warrant to the Company with written instructions
for such transfer. Upon such presentation for transfer, the Company shall
promptly execute and deliver a new Warrant or Warrants in the form hereof in the
name of the assignee or assignees and in the denominations specified in such
instructions. The Company shall pay all expenses incurred by it in connection
with the preparation, issuance and delivery of Warrants under this Section.

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<PAGE>

         6. Warrant Holder Not Shareholder; Rights Offering; Preemptive Rights.
Except as otherwise provided herein, this Warrant does not confer upon the
Holder, as such, any right whatsoever as a shareholder of the Company.
Notwithstanding the foregoing, if the Company should offer to all of the
Company's shareholders the right to purchase any securities of the Company, then
all shares of Common Stock that are subject to this Warrant shall be deemed to
be outstanding and owned by the Holder and the Holder shall be entitled to
participate in such rights offering. The Company shall not grant any preemptive
rights with respect to any of its capital stock without the prior written
consent of the Holder.

         7. Observation Rights. The Holder of this Warrant shall receive notice
of and be entitled to attend or may send a representative to attend all meetings
of the Company's Board of Directors in a non-voting observation capacity and
shall receive a copy of all correspondence and information delivered to the
Company's Board of Directors, from the date hereof until such time as all
indebtedness of the Company to the Holder has been paid in full.

         8. Adjustment Upon changes in Stock.

                  (a) If all or any portion of this Warrant shall be exercised
subsequent to any stock split, stock dividend, recapitalization, combination of
shares of the Company, or other similar event, occurring after the date hereof,
then the Holder exercising this Warrant shall receive, for the aggregate
Exercise Price, the aggregate number and class of shares which such Holder would
have received if this Warrant had been exercised immediately prior to such stock
split, stock dividend, recapitalization, combination of shares, or other similar
event. If any adjustment under this Section 8(a), would create a fractional
share of Common Stock or a right to acquire a fractional share of Common Stock,
such fractional share shall be disregarded and the number of shares subject to
this Warrant shall be the next higher number of shares, rounding all fractions
upward. Whenever there shall be an adjustment pursuant to this Section 8(a), the
Company shall forthwith notify the Holder or Holders of this Warrant of such
adjustment, setting forth in reasonable detail the event requiring the
adjustment and the method by which such adjustment was calculated.

                  (b) If all or any portion of this Warrant shall be exercised
subsequent to any merger, consolidation, exchange of shares, separation,
reorganization or liquidation of the Company, or other similar event, occurring
after the date hereof, as a result of which shares of Common Stock shall be
changed into the same or a different number of shares of the same or another
class or classes of securities of the Company or another entity, or the holders
of Common Stock are entitled to receive cash or other property, then the Holder
exercising this Warrant shall receive, for the aggregate Exercise Price, the
aggregate number and class of shares, cash or other property which such Holder
would have received if this Warrant had been exercised immediately prior to such
merger, consolidation, exchange of

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<PAGE>

shares, separation, reorganization or liquidation, or other similar event. If
any adjustment under this Section 8(b) would create a fractional share of Common
Stock or a right to acquire a fractional share of Common Stock, such fractional
share shall be disregarded and the number of shares subject to this Warrant
shall be the next higher number of shares, rounding all fractions upward.
Whenever there shall be an adjustment pursuant to this Section 8(b), the Company
shall forthwith notify the Holder or Holders of this Warrant of such adjustment,
setting forth in reasonable detail the event requiring the adjustment and the
method by which such adjustment was calculated.

         9. Put Agreement.

                  (a) The Company hereby irrevocably grants and issued to Holder
the right and option to sell to the Company (the "Put") this Warrant for a
period of thirty (30) days immediately prior to the Expiration Date, at a
purchase price (the "Put Price") equal to the Fair Market Value (as hereinafter
defined) of the shares of Common Stock issuable to Holder upon exercise of this
Warrants.

                  (b) Holder may exercise the Put by delivery of written notice
(the "Put Notice") of such exercise to the Company in the manner and at the
address of the Company set forth in Section 13 hereof. The Company shall pay to
Holder, in cash or by wire transfer of immediately available funds, the Put
Price within thirty (30) days of the receipt of the Put Notice.

                  (c) For purposes of this Section 9, the Fair Market Value of
the shares of Common Stock of the Company issuable pursuant to this Warrant
shall be determined as follows:

                           (i) The Company and the Holder shall each appoint an
         independent, experienced appraiser who is a member of a recognized
         professional association of business appraisers. The two appraisers
         shall determine the value of the shares of Common Stock which would be
         issued upon the exercise of the Warrant, assuming that the sale would
         be between a willing buyer and a willing seller, both of whom have full
         knowledge of the financial and other affairs of the Company, and
         neither of whom is under any compulsion to sell or to buy.

                           (ii) If the higher of the two appraisals is not ten
         percent (10%) greater and the lower of the appraisals, the Fair Market
         Value shall be the average of the two appraisals. If the higher of the
         two appraisals is equal to or greater than ten percent (10%) more than
         the lower of the two appraisals, then a third appraiser shall be
         appointed by the two appraisers, and if they cannot agree on a third
         appraiser, the American Arbitration Association shall appoint the third
         appraiser. The third appraiser, regardless of who

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<PAGE>

         appoints him or her, shall have the same qualifications as the first
         two appraisers.

                           (iii) The Fair Market Value after the appointment of
         the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
         paid one-half by the Company and one-half by the Holder.

         10. Registration.

                  (a) The Company and the holders of the Shares agree that if at
any time after the date hereof the Company shall propose to file a registration
statement with respect to any of its Common Stock on a form suitable for a
secondary (including its initial public offering), it will give notice in
writing to such effect to the registered holder(s) of the Shares at least thirty
(30) days prior to such filing, and, at the written request of any such
registered holder, made within ten (10) days after he receipt of such notice,
will include therein at the Company's cost and expense (including the fees and
expenses of counsel to such holder(s), but excluding underwriting discounts,
commissions and filing fees attributable to the Shares included therein) such of
the Shares as such holder(s) shall request; provided, however, that if the
offering being registered by the Company is underwritten and if the
representative of the underwriters certifies in writing that the inclusion
therein of the Shares would materially and adversely affect the sale of the
securities to be sold by the Company thereunder, then the Company shall be
required to include in the offering only that number of securities, including
the Shares, which the underwriters determine in their sole discretion will not
jeopardize the success of the offering (the securities so included to be
apportioned pro rata among all selling shareholders according to the total
amount of securities entitled to be included therein owned by each selling
shareholder, but in no event shall the total amount of shares included in the
offering be less than the number of securities included in the offering by any
other single selling shareholder unless all of the Shares are included in the
offering).

                  (b) Whenever the Company undertakes to effect the registration
of any of the Shares, the Company shall, as expeditiously as reasonably
possible:

                           (i) Prepare and file with the Securities and Exchange
         Commission (the "Commission") a registration statement covering such
         Shares and use its best efforts to cause such registration statement to
         be declared effective by the Commission as expeditiously as possible
         and to keep such registration effective until the earlier of (A) the
         date when all Shares covered by the registration statement have been
         sold or (B) one hundred eighty (180) days from the date of the
         registration statement; provided, that before filing a registration
         statement or prospectus or any amendment or supplements thereto,

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<PAGE>

         the company will furnish to each Holder of Shares covered by such
         registration statement and the underwriters, if any, copies of all such
         documents proposed to be filed (excluding exhibits, unless any such
         person shall specifically request exhibits), which documents will be
         subject to the review of such Holders and underwriters, and the Company
         will not file such registration statement or any amendment thereto or
         any prospectus or any supplement thereto (including any documents
         incorporated by reference therein) with the Commission if (A) the
         underwriters, if any, shall reasonably object to such filing or (B) if
         information in such registration statement or prospectus concerning a
         particular selling Holder has changed and such Holder or the
         underwriters, if any, shall reasonably object.

                           (ii) Prepare and file with the Commissions such
         amendments and post-effective amendments to such registration statement
         as may be necessary to keep such registration statement effective
         during the period referred to in Section 10(b)(i) and to comply with
         the provisions of the Securities Act with respect to the disposition of
         all securities covered by such registration statement, and cause the
         prospectus to be supplemented by any required prospectus supplement,
         and as so supplemented to be filed with the Commission pursuant to Rule
         424 under the Securities Act.

                           (iii) Furnish to the selling Holder(s) such numbers
         of copies of such registration statement, each amendment thereto, the
         prospectus included in such registration statement (including each
         preliminary prospectus), each supplement thereto and such other
         documents as they may reasonably request in order to facilitate the
         disposition of the Shares owned by them.

                           (iv) Use its best efforts to register and qualify
         under such other securities laws of such jurisdictions as shall be
         reasonably requested by any selling Holder and do any and all other
         acts and things which may be reasonably necessary or advisable to
         enable such selling Holder to consummate the disposition of the Shares
         owned by such Holder, in such jurisdictions; provided, however, that
         the Company shall not be required in connection therewith or as a
         condition thereto qualify to transact business or to file a general
         consent to service of process in any such states or jurisdictions.

                           (v) Promptly notify each selling Holder of the
         happening or any event as a result of which the prospectus included in
         such registration statement contains an untrue statement of a material
         fact or omits any fact necessary to make the statements therein not
         misleading and, at the request of any such Holder, the Company will
         prepare a supplement or amendment to such prospectus so that, as
         thereafter delivered to the purchasers of such Shares, such prospectus
         will not contain an untrue statement of a material fact or omit to
         state any fact necessary to make the statements therein not misleading.

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<PAGE>

                           (vi) Provide a transfer agent and registrar for all
         such Shares not later than the effective date of such registration
         statement.

                           (vii) Enter into such customary agreements (including
         underwriting agreements in customary form for a primary offering) and
         take all such other actions as the underwriters, if any, reasonably
         request in order to expedite or facilitate the disposition of such
         Shares (including, without limitation, effecting a stock split or a
         combination of shares).

                           (viii) Make available for inspection by any selling
         Holder or any underwriter participating in any disposition pursuant to
         such registration statement and any attorney, accountant or other agent
         retained by any such selling Holder or underwriter, all financial and
         other records, pertinent corporate documents and properties of the
         Company, and cause the officers, directors, employees and independent
         accountants of the Company to supply all information reasonably
         requested by any such seller, underwriter, attorney, accountant or
         agent in connection with such registration statement.

                           (ix) Promptly notify the selling Holder(s) and the
         underwriters, if any, of the following events and (if requested by any
         such person) confirm such notification in writing: (A) the filing of
         the prospectus or any prospectus supplement and the registration
         statement and any amendment or post-effective amendment thereto and,
         with respect to the registration statement or any post-effective
         amendment thereto, the declaration of the effectiveness of such
         documents, (B) any requests by the Commission for amendments or
         supplements to the registration statement or the prospectus or for
         additional information, (C) the issuance or threat of issuance by the
         Commission of any stop order suspending the effectiveness of the
         registration statement or the initiation of any proceedings for that
         purpose and (D) the receipt by the Company of any notification with
         respect to the suspension of the qualification of the Shares for sale
         in any jurisdiction or the initiation or threat of initiation of any
         proceeding for such purposes.

                           (x) Make every reasonable effort to prevent the entry
         of any order suspending the effectiveness of the registration statement
         and obtain at the earliest possible moment the withdrawal of any such
         order, if entered.

                           (xi) Cooperate with the selling Holder(s) and the
         underwriters, if any, to facilitate the timely preparation and delivery
         of certificates representing the Shares to be sold and not bearing any
         restrictive legends, and enable such Shares to be in such lots and
         registered in such names as the underwriters may request at least two
         (2) business days prior to any delivery of the Shares to the
         underwriters.

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                           (xii) Provide a CUSIP number for all the Shares not
         later than the effective date of the registration statement.

                           (xiii) Prior to the effectiveness of the registration
         statement and any post-effective amendment thereto and at each closing
         of an underwritten offering, (A) make such representations and
         warranties to the selling Holder(s) and the underwriters, if any, with
         respect to the Shares and the registration statement as are customarily
         made by issuers in primary underwritten offerings; (B) use its best
         efforts to obtain "cold comfort" letters and updates thereof from the
         Company's independent certified public accountants addressed to the
         selling Holders and the underwrites, if any, such letters to be in
         customary form and covering matters of the type customarily covered in
         "cold comfort" letters by underwriters in connection with primary
         underwritten offerings; (C) deliver such documents and certificates as
         may be reasonably requested (1) by the holders of a majority of the
         Shares being sold, and (2) by the underwriters, if any, to evidence
         compliance with clause (A) above and with any customary conditions
         contained in the underwriting agreement or other agreement entered into
         by the Company; and (D) obtain opinions of counsel to the Company and
         updates thereof (which counsel and which opinions shall be reasonably
         satisfactory to the underwriters, if any), covering the matters
         customarily covered in opinions requested in underwritten offerings and
         such other matters as may be reasonably requested by the selling
         Holders and underwriters or their counsel. Such counsel shall also
         state that no facts have come to the attention of such counsel which
         cause them to believe that such registration statement, the prospectus
         contained therein, or any amendment or supplement thereto, as of their
         respective effective or issue dates, contains any untrue statement of
         any material fact or omits to state any material fact necessary to make
         the statements therein not misleading (except that no statement need be
         made with respect to any financial statements, notes thereto or other
         financial data or other expertized material contained therein). If for
         any reason the Company's counsel is unable to give such opinion, the
         Company shall so notify the Holders of the Shares and shall use its
         best efforts to remove expeditiously all impediments to the rendering
         of such opinion.

                           (xiv) Otherwise use its best efforts to comply with
         all applicable rules and regulations of the Commission, and make
         generally available to its security holders earnings statements
         satisfying the provisions of Section 11(a) of the Securities Act, no
         later than forty-five (45) days after the end of any twelve-month
         period (or ninety (90) days, if such period is a fiscal year) (A)
         commending at the end of any fiscal quarter in which the Shares are
         sold to underwriters in a firm or best efforts underwritten offering,
         or (B) if not sold to underwrites in such an offering, beginning with
         the first month of the first fiscal quarter of the Company commencing
         after the effective date of the registration statement, which
         statements shall cover such twelve-month periods.

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                  (c) After the date hereof, the Company shall not grant to any
holder of securities of the Company any registration rights which have a
priority greater than or equal to those granted to Holders pursuant to this
warrant without the prior written consent of the Holder(s).

                  (d) The Company's obligations under Section 10(a) above with
respect to each holder of Shares are expressly conditioned upon such holders'
furnishing to the Company in writing such information concerning such holder and
the terms of such holder's proposed offering as the Company shall reasonably
request for inclusion in the registration statement. If any registration
statement including any of the Shares is filed, then the Company shall indemnity
each holder thereof (and each underwriter for such holder and each person, if
any, who controls such underwriter within the meaning of the Securities Act)
from any loss, claim, damage or liability arising out of, based upon or in any
way relating to any untrue statement of a material fact contained in such
registration statement or any omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
except for any such statements or omission based on information furnished in
writing by such holder of the Shares expressly for use in connection with such
registration statement; and such holder shall indemnify the Company (and each of
its officers and directors who has signed such registration statement, each
director, each person, if any, who controls the Company within the meaning of
the Securities Act, each underwriter for the Company and each person, if any,
who controls such underwriter within the meaning of the Securities Act) and each
other such holder against any loss, claim, damage or liability arising from any
such statement or omission which was made in reliance upon information furnished
in writing to the Company by such holder of the Shares expressly for use in
connection with such registration statement.

                  (e) For purposes of this Section 10, all of the Shares shall
be deemed to be issued and outstanding.

         11. Certain Notices. In case at any time the Company shall propose to:

                  (a) declare any cash dividend upon its Common Stock;

                  (b) declare any dividend upon its Common Stock payable in
stock or make any special dividend or other distribution to the holders of its
Common Stock;

                  (c) offer for subscription to the holders of any of its Common
Stock any additional shares of stock in any class or other rights;

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                  (d) reorganize, or reclassify the capital stock of the
Company, or consolidate, merge or otherwise combine with, or sell of all or
substantially all of its assets to, another corporation;

                  (e) voluntarily or involuntarily dissolve, liquidate or wind
up of the affairs of the Company; or

                  (f) redeem or purchase any shares of its capital stock or
securities convertible into its capital stock;

then, in any one or more of said cases, the Company shall give to the Holder of
the Warrant, by certified or registered mail, (i) at least twenty (20) days'
prior written notice of the date on which the books of the Company shall close
or a record shall be taken for such dividend, distribution or subscription
rights or for determining rights to vote in respect of any such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up, and (ii) in the case of such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up, at least
twenty (20) days' prior written notice of the date when the same shall take
place. Any notice required by clause (i) shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Common Stock shall be entitled thereto, and any notice required by
clause (ii) shall specify the date on which the holders of Common Stock shall be
entitled to exchange their Common Stock for securities or other property
deliverable upon such reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding up, as the case may be.

         12. Article and Section Headings. Numbered and titled article and
section headings are for convenience only and shall not be construed as
amplifying or limiting any of the provisions of this Warrant.

         13. Notice. Any and all notices, elections or demands permitted or
required to be made under this Warrant shall be in writing, signed by the party
giving such notice, election or demand and shall be delivered personally,
telecopied, or sent by certified mail or overnight via nationally recognized
courier service (such as Federal Express), to the other party at the address set
forth below, or at such other address as may be supplied in writing and of which
receipt has been acknowledged in writing. The date of personal delivery or
telecopy or two (2) business days after the date of mailing (or the next
business day after delivery to such court service), as the case may be, shall be
the date of such notice, election or demand. For the purposes of this Warrant:

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The Address of Holder is:                    Wi-LAN Inc.
                                             Suite 300, 801 Manning Road, N.E.
                                             Calgary, Alberta
                                             T2E 818
                                             Attention:  Hatim Zaghloul
                                             Telecopy No. 403/273-5100

with a copy to:                              Burnet, Duckworth & Palmer
                                             First Canadian Center
                                             1400, 350 7th Avenue, S.W.
                                             Calgary, Alberta
                                             T2P 3N9
                                             Attention:  Fred Davidson
                                             Telecopy No. 403/260-0332

The Address of Company is:                   Digital Transmission Systems, Inc.
                                             3000 Northwoods Parkway
                                             Building 300
                                             Norcross, Georgia  30071
                                             Attention:  Andrea C. Salazar

with a copy to:                              Sutherland, Asbill & Brennan, LLP
                                             999 Peachtree Street, N.E.
                                             Atlanta, Georgia  30309
                                             Attention:  Mark D. Wasserman

         14. Severability. If any provision(s) of this Warrant or the
application thereof to any person or circumstances shall be invalid or
unenforceable to any extent, the remainder of this Warrant and the application
of such provisions to other persons or circumstances shall not be affected
thereby and shall be enforced to the greatest extent permitted by law.

         15. Entire Agreement. This Warrant between the Company and Holder
represents the entire agreement between the parties concerning the subject
matter hereof, and all oral discussions and prior agreement are merged herein.

         16. Governing Law and Amendments. This Warrant shall be construed and
enforced under the laws of the State of Tennessee applicable to contracts to be
wholly performed in such State. No amendment or modification hereof shall be
effective except in a writing executed by each of the parties hereto.

         17. Counterparts. This Warrant may be executed in any number of
counterparts and be different parties to this Warrant in separate counterparts,
each of which when so executed shall be deemed to be an original and all of
which taken together shall constitute one and the same Warrant.

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         18. Consent to Jurisdiction; Exclusive Venue. The Company hereby
irrevocably consents to the jurisdiction of the United States District Court for
the Middle District of Tennessee and of all Tennessee state courts sitting in
Davidson County, Tennessee, for the purpose of any litigation to which Holder
may be a party and which concerns this Warrant. It is further agreed that venue
for any such action shall be exclusively with courts sitting in Davidson County,
Tennessee, unless Holder agrees to the contrary in writing.

         19. Waiver of Trial in Jury. HOLDER AND THE COMPANY HEREBY KNOWINGLY
AND VOLUNTARILY WITH THE BENEFIT OF COUNSEL WAIVE TRIAL BY JURY IN ANY ACTIONS,
PROCEEDINGS, CLAIMS OR COUNTER-CLAIMS, WHETHER IN CONTRACT OR TORT OR OTHERWISE,
AT LAW OR IN EQUITY, ARISING OUT OF OR IN ANY WAY RELATING TO THIS WARRANT.

         20. Equity Participation. This Warrant is issued in connection with the
Debenture Purchase Agreement, as amended between the Company and Sirrom Capital
Corporation which was purchased by Wi-LAN as of January 7, 2000 (the "Loan
Agreement"). It is intended that this Warrant constitute an equity participation
under and pursuant to T.C.A. ss. 47-24-101, et seq., and that equity
participation be permitted under said statutes and not constitute interest on
the debt obligations of the Company to the Holder. If under any circumstances
whatsoever, fulfillment of any obligation of this Warrant, the Loan Agreement,
or any other agreement or document executed in connection with the Loan
Agreement, shall violate the lawful limit of any applicable usury statute or any
other applicable law with regard to obligations of like character and amount,
then the obligation to be fulfilled shall be reduced to such lawful limit, such
that in no event shall there occur, under this Warrant, the Loan Agreement, or
any other document or instrument executed in connection with the Loan Agreement,
any violation of such lawful limit, but such obligation shall be fulfilled to
the lawful limit. If any sum is collected in excess of the lawful limit, such
excess shall be applied to reduce the principal amount of the debt obligations
of the Company to the Holder.

         IN WITNESS WHEREOF, the parties hereto have set their hands as of the
date first above written.

                                        COMPANY:
                                        -------

                                        DIGITAL TRANSMISSION SYSTEMS, INC.,
                                        a Tennessee corporation

                                        By:_______________________________
                                        Title:____________________________

                                       13

<PAGE>

                                        HOLDER:
                                        ------

                                        WI-LAN INC.,
                                        an Alberta corporation

                                        By:_______________________________
                                        Title:____________________________

                                       14SHARE PURCHASE AGREEMENT made the 29th day of December, 1999.

BETWEEN:

         WI-LAN INC., a body corporate, incorporated pursuant to the laws of the
         Province of Alberta (hereinafter referred to as the "Purchaser")

                                                               OF THE FIRST PART

AND

         MICROTEL INTERNATIONAL, INC., a body corporate, incorporated pursuant
         to the laws of the State of Delaware (hereinafter referred to as the
         "Vendor")

                                                              OF THE SECOND PART

         WHEREAS the Vendor is the beneficial owner of the DTS Shares;

         AND WHEREAS the Vendor has agreed to sell, transfer and assign and the
Purchaser has agreed to purchase and acquire, the DTS Shares upon the terms and
conditions set forth herein;

         In consideration of the premises, covenants and agreements herein and
other good and valuable consideration (the receipt and sufficiency of which is
hereby acknowledged), the parties hereto covenant and agree as follows:

                                    ARTICLE 1
                                 INTERPRETATION

1.1      Definitions

         In this Agreement, unless the context otherwise requires:

a.       "Agreement" means this agreement, including the recitals, as amended or
         supplemented from time to time, and "hereby", "hereof", "herein",
         "hereunder", "herewith", "hereto" and similar terms refer to this
         Agreement and not to any particular provision of this Agreement;

b.       "business day" means a day, other than a Saturday, Sunday or statutory
         holiday, when banks are generally open for the transaction of banking
         business in the City of Calgary;

c.       "Closing" means the closing of the transactions contemplated herein;

d.       "Closing Date" means January 7, 2000 or such later date upon which the
         transactions contemplated by the Related Agreements have been completed
         or such other date as may be agreed upon by the parties hereto;

e.       "Closing Time" means 2:00 p.m. (Calgary time), or such other time as
         may be agreed upon by the parties hereto, on the Closing Date;

f.       "Corporation" or "DTS" means Digital Transmission Systems, Inc., a body
         corporate incorporated under the laws of the State of Delaware;

g.       "DTS Shares" means 1,738,159 common shares in the capital stock of the
         Corporation, as constituted on the date hereof;

<PAGE>

                                        2

h.       "Encumbrance" includes, without limitation, any mortgage, pledge,
         assignment, charge, lien, security interest, claim, trust, royalty,
         carried, working, participation, net profits interest or other third
         party interest and any agreement, option, right or privilege (whether
         by law, contract or otherwise) capable of becoming any of the
         foregoing;

i.       "Exchange" means The Toronto Stock Exchange;

j.       "person" includes an individual, partnership, firm, trust, body
         corporate, governmental authority, unincorporated body of persons or
         association;

k.       "Purchaser" or "Wi-LAN" means Wi-LAN Inc., a body corporate
         incorporated under the laws of the Province of Alberta;

l.       "Purchaser's Counsel" means Burnet, Duckworth & Palmer or such other
         legal counsel as may be designated by the Purchaser;

m.       "Related Agreements" means the agreements of even date herewith entered
         into between the Purchaser and Finova Mezzanine Capital Inc. and the
         Purchaser and DTS; and

n.       "Wi-LAN Common Shares" means common shares of the Purchaser as a class,
         as constituted on the date hereof.

1.2      Schedules

         The following Schedules form part of this Agreement:

         Schedule A        Representation Letter
         Schedule B        The Toronto Stock Exchange Private Placement
                           Questionnaire and Undertaking

1.3      Headings

         The division of this Agreement into articles, sections and paragraphs
and the insertion of headings are for convenience of reference only and shall
not affect in any way the meaning or interpretation of this Agreement.

1.4      Section References

         Unless the context otherwise requires, references in this Agreement to
an article, section, paragraph, clause, subclause or schedule by number, letter
or otherwise refer to the article, section, subsection, paragraph, clause,
subclause or schedule, respectively, bearing that designation in this Agreement.

1.5      Gender, Plural

         In this Agreement, unless the contrary intention appears, words
importing the singular include the plural and vice versa; words importing gender
shall include all genders.

1.6      Date for Actions

         In the event that the date on which any action is required to be taken
hereunder by any of the parties is not a business day in the place where the
action is required to be taken, such action shall be required to be taken on the
next succeeding day which is a business day in such place.

<PAGE>

                                        3

1.7      Enforceability

         All representations and warranties in or contemplated by this Agreement
as to the enforceability of any agreement or document are subject to
enforceability being limited by applicable bankruptcy, insolvency,
reorganization and other laws affecting creditors' rights generally and the
discretionary nature of certain remedies (including specific performance and
injunctive relief).

                                    ARTICLE 2
                                PURCHASE AND SALE

2.1      Agreement to Purchase and Sell

         At the Closing Time, the Vendor agrees to sell, transfer and assign to
the Purchaser or its nominee, and the Purchaser or its nominee agree to purchase
and acquire from the Vendor, the DTS Shares, in exchange for an aggregate of
U.S. $520,000 and 28,340 Wi-LAN Common Shares.

2.2      Execution of Purchase and Sale

         At the Closing Time, the Purchaser shall deliver to the Vendor a
certified cheque or bank draft in the amount of U.S. $520,000 and a share
certificate representing 28,340 Wi-LAN Common Shares against delivery by the
Vendor to the Purchaser of share certificates representing the DTS Shares owned
by the Vendor, duly endorsed in blank for transfer, or accompanied by duly
executed powers of attorney for transfer in blank.

                                    ARTICLE 3
                  REPRESENTATIONS AND WARRANTIES OF THE VENDOR

3.1      Representations and Warranties of the Vendor

         The Vendor represents and warrants to the Purchaser that:

a.       the Vendor is duly and validly incorporated, organized and existing
         under the laws of its jurisdiction of incorporation;

b.       the Vendor has all requisite power and authority to enter into this
         Agreement and all documents to be delivered pursuant hereto and to
         perform its obligations hereunder and thereunder;

c.       the Vendor owns the DTS Shares and has full power and authority to
         transfer the DTS Shares to the Purchaser and to receive U.S. $520,000
         and the Wi-LAN Common Shares therefor and to agree to the terms,
         conditions and provisions herein contained;

d.       all of the DTS Shares transferred hereunder are owned by the Vendor as
         the sole beneficial owner with good, valid and marketable title and
         good, valid and marketable title to such securities will vest in the
         Purchaser as a result of the consummation of the transactions
         contemplated herein free and clear of any Encumbrances, voting trusts,
         unanimous or other shareholder agreements, proxies and other interests,
         claims or demands of every kind or nature whatsoever (other than such
         as may be created by the Purchaser);

e.       except pursuant to this Agreement, no person has any agreement, option,
         right or privilege (including, without limitation, whether by law,
         pre-emptive right, contract or otherwise) to purchase, convert into,
         exchange for or otherwise acquire, nor any agreement, option, right or
         privilege capable of becoming any such agreement, option, right or
         privilege, any of the Vendor's DTS Shares, or any interest therein;

<PAGE>

                                        4

f.       the DTS Shares are not subject to any trading restrictions under
         federal or state laws in the United States;

g.       the DTS shares are listed on the Nasdaq Over-The-Counter Market;

h.       there are no actions, suits or proceedings commenced, pending or
         threatened against the Vendor with respect to the DTS Shares;

i.       the execution and delivery of this Agreement does not and will not
         result in a breach of, or constitute a default under, any term or
         provision of any agreement or other documents to which the Vendor is a
         party;

j.       the Vendor has not incurred any obligation or liability, contingent or
         otherwise, for brokerage fees, finders' fees, agents' commission or
         similar forms of compensation with respect to the transactions
         contemplated herein;

k.       the Vendor will not resell the Wi-LAN Common Shares it receives
         hereunder except in accordance with the provisions of applicable
         securities legislation and the rules of the Exchange;

l.       the Vendor has executed this Agreement in the United States, and it has
         concurrently executed and delivered the Representation Letter attached
         as Schedule A to this Agreement;

m.       if required by applicable securities legislation, policy or order or by
         any securities commission, stock exchange or other regulatory
         authority, the Vendor will execute, deliver, file and otherwise assist
         the Corporation in filing, such reports, undertakings and other
         documents with respect to the issue of the 28,340 Wi-LAN Common Shares
         to the Vendor (including, without limitation, any undertaking required
         by the Exchange in the form attached as Schedule B to this Agreement);

n.       to the best of the Vendor's knowledge, information and belief, the
         representations and warranties of the Corporation contained in the
         Convertible Debenture Purchase Agreement dated December 28, 1999
         between the Corporation and the Vendor are true and correct in all
         material respects;

o.       the Vendor has no information or knowledge of any fact relating to the
         business of the Corporation or the DTS Shares which if known to the
         Purchaser, might reasonably be expected to deter the Purchaser from
         completing the transactions of purchase and sale contemplated herein;
         and

p.       this Agreement has been duly executed and delivered by the Vendor and
         all documents to be delivered by the Vendor pursuant hereto will be
         duly executed and delivered and this Agreement does and such documents
         will constitute legal, valid and binding obligations of the Vendor
         enforceable in accordance with their respective terms.

                                    ARTICLE 4
                 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

4.1      Representations and Warranties of the Purchaser

         The Purchaser represents and warrants to the Vendor that:

a.       the Purchaser is duly organized and validly existing under the law of
         the jurisdiction of its incorporation;

b.       the Wi-LAN Common Shares are listed and posted for trading on the
         Exchange;

c.       the Purchaser has all requisite power and authority to enter into this
         Agreement and all documents to be delivered pursuant hereto and to
         perform its obligations hereunder and thereunder;

<PAGE>

                                        5

d.       the Purchaser will have full power and authority to pay U.S. $520,000
         to the Vendor and to issue the 28,340 Wi-LAN Common Shares to the
         Vendor upon receipt of the required regulatory approval and has full
         power and authority to receive the DTS Shares therefor and to agree to
         the terms, conditions and provisions herein contained; and

e.       this Agreement has been duly authorized, executed and delivered by the
         Purchaser and all documents to be delivered by the Purchaser pursuant
         hereto will be duly executed and delivered and this Agreement does and
         such documents will constitute legal, valid and binding obligations of
         the Purchaser enforceable in accordance with their respective terms.

                                    ARTICLE 5
                         PURCHASER'S CLOSING CONDITIONS

5.1      Conditions Precedent

         The obligations of the Purchaser to complete the transactions
contemplated herein is subject to:

a.       the Purchaser being satisfied in its sole discretion with its due
         diligence review of DTS and its assets and operations including,
         without limitation, the financial statements of DTS, the obligations
         and liabilities of DTS, the products and revenue stream of DTS and the
         material agreements of DTS;

b.       since December 20, 1999 DTS shall have carried on its business in the
         ordinary course of business consistent with past practices and shall
         not have engaged in any material transactions outside the ordinary
         course of business (including increasing long-term debt) except as
         disclosed to and approved by Wi-LAN in writing;

c.       DTS's issued and outstanding share capital at the Closing Time
         consisting of an aggregate of 4,646,221 common shares, 1,314,333
         preferred shares, warrants entitling the holders thereof to acquire an
         aggregate of 2,433,315 common shares at exercise prices ranging from
         U.S. $0.12 to U.S. $9.00 per share, options entitling the holders
         thereof to acquire an aggregate of 1,019,880 common shares at exercise
         prices ranging from U.S. $0.47 to U.S. $13.75 per share and a U.S.
         $2,000,000 convertible debenture entitling the holder thereof to
         acquire 2,000,000 common shares at an exercise price of U.S. $1.00 per
         share;

d.       since December 20, 1999 DTS shall not have declared or paid any
         dividends or made any other distributions of any of its shares or
         granted any further options or warrants or any right or privilege
         capable of becoming an option or agreement in respect of its shares;

e.       the Purchaser having obtained all consents, approvals and
         authorizations necessary or required in connection with the
         transactions contemplated herein, including without limitation the
         approval of The Toronto Stock Exchange on terms and conditions
         reasonably satisfactory to the Purchaser on or before the Closing Time;

f.       the Purchaser shall have received the opinion of Gallager, Briody &
         Butler, counsel for the Vendor dated the Closing Date, addressed to the
         Purchaser, in form and substance satisfactory to the Purchaser's
         Counsel;

g.       the transactions contemplated by the Related Agreements shall have been
         completed;

h.       the Vendor, having completed, executed and delivered the Representation
         Letter attached as Schedule A hereto;

<PAGE>

                                        6

i.       the Vendor, having completed, executed and delivered The Toronto Stock
         Exchange Private Placement Questionnaire and Undertaking attached as
         Schedule B hereto in a form satisfactory to the Exchange;

j.       the board of directors of DTS being comprised of a majority of Wi-LAN
         representatives at the Closing Time;

k.       all MicroTel representatives resigning from the board of directors of
         DTS at the Closing Time;

l.       except as contemplated by this Agreement, there shall not have occurred
         any material change, change of material fact or any development that
         could result in a material change or change of a material fact in the
         business, operations or affairs of DTS;

m.       there will be no actions, suits or proceedings, whether or not
         purportedly on behalf of DTS, outstanding, pending or threatened by or
         against DTS at law or in equity or before or by any federal,
         provincial, municipal or other governmental department, commission,
         bureau, agency or instrumentality;

n.       all necessary steps and proceedings shall have been taken to allow the
         DTS Shares to be duly transferred from the Vendor to the Purchaser and
         to vest in the Purchaser good and marketable title in the DTS Shares
         free and clear of any Encumbrances, voting trusts, unanimous or other
         shareholder agreements, proxies and other interests, claims or demands
         of every kind or nature whatsoever (other than such as may be created
         by the Purchaser);

o.       any consents or approvals required to be obtained from any third party,
         including any holder of indebtedness or any outstanding security of
         DTS, and any amendments of agreements which shall be necessary to
         permit the consummation of the transactions contemplated hereby shall
         have been obtained and all such consents or amendments shall be
         satisfactory in form and substance to the Purchaser and the Purchaser's
         Counsel; and

p.       the representations and warranties made by the Vendor herein shall be
         true at the Closing Time as if made at and as of such time and the
         Vendor shall have complied with its covenants herein and the Purchaser
         shall have received a certificate signed by the President of the Vendor
         confirming same.

5.2      Waiver of Conditions

         The conditions precedent set forth in Section 5.1 are for the benefit
of the Purchaser and may be waived, in whole or in part, by the Purchaser at any
time. If any of the said conditions precedent shall not be complied with or
waived as aforesaid on or before the date required for the fulfilment thereof,
the Purchaser may, in addition to the other remedies it may have at law or in
equity, rescind and terminate this Agreement by notice to the other party.

                                    ARTICLE 6
                                     CLOSING

6.1      Place of Closing

         Closing shall take place at the offices of the Purchaser's Counsel at
the Closing Time, or at such other place as may be agreed upon by the parties
hereto.

<PAGE>

                                        7

                                    ARTICLE 7
                                    INDEMNITY

7.1      Vendor Indemnity

a.       The Vendor shall indemnify and save the Purchaser harmless against and
         from all liabilities, claims, demands, losses, costs (including,
         without limitation, legal fees and disbursements on a full indemnity
         basis), damages and expenses to which the Purchaser may be subject or
         which the Purchaser may suffer or incur, whether under the provisions
         of any statute or otherwise, in any way caused by, or arising directly
         or indirectly from or in consequence of any breach of, default under or
         non-compliance by the Vendor with any representation, warranty, term,
         covenant or condition of this Agreement or in any certificate or other
         document delivered by or on behalf of the Vendor hereunder or pursuant
         hereto.

b.       The rights and remedies of the Purchaser set forth in paragraph 7.1(a)
         are to the fullest extent possible in law cumulative and not
         alternative and the election by the Purchaser to exercise any such
         right or remedy shall not be, and shall not be deemed to be, a waiver
         of any other rights and remedies. The Purchaser shall not be obligated
         to pursue any claim or remedy against any third party including,
         without limitation, DTS or Finova Mezzanine Capital Inc. before being
         entitled to obtain full indemnification from the Vendor pursuant to
         paragraph 7.1(a).

c.       Any liability of the Vendor under paragraph 7.1(a) shall be limited to
         U.S. $1,000,000.

                                    ARTICLE 8
                                     NOTICES

8.1      Notices

         Any notice, consent, waiver, direction or other communication required
or permitted to be given under this Agreement by a party to any other party
shall be in writing and shall be delivered by hand delivery, facsimile
transmission or (provided that the mailing party does not know and should not
reasonably have known of any disruption or anticipated disruption of postal
service which might affect delivery of the mail) by registered mail (postage
prepaid), addressed to the party to whom the notice is to be given, at its
address for service herein. Any notice, consent, waiver, direction or other
communication aforesaid shall, if hand delivered or delivered by telex or
facsimile transmission, be deemed to have been given and received on the date on
which its was hand delivered or delivered by facsimile transmission to the
address provided herein (if a business day and, if not, the next succeeding
business day) and if sent by registered mail be deemed to have been given and
received on the third business day at the point of delivery following the date
on which it was so sent.

8.2      Address for Service

         The address for service of each of the parties hereto shall be as
follows:

if to the Purchaser:

         Wi-LAN Inc.
         Suite 300, 801 Manning Road N.E.
         Calgary, Alberta
         T2E 8J8

         Attention: Hatim Zaghloul, Chairman and Chief Executive Officer

         Telecopy:  (403) 273-5100

<PAGE>

                                        8

if to the Vendor:

         MicroTel International, Inc.
         4290 East Brickell Street
         Ontario, CA   81761

         Attention: Carmine T. Oliva, Chairman and Chief Executive Officer

         Telecopy:  (909) 297-2644

or such other address as may be designated by notice to the other parties
hereto.

                                    ARTICLE 9
                                  MISCELLANEOUS

9.1      Entire Agreement

         This Agreement, together with documents to be delivered pursuant
hereto, constitutes the entire agreement between the parties hereto, and cancels
and supersedes all prior agreements and understandings between the parties
hereto, with respect to the subject matter hereof.

9.2      Further Assurances

         Each party hereto shall, from time to time, and at all times hereafter,
at the request of the other party hereto, but without further consideration, do
all such further acts and execute and deliver all such further documents and
instruments as shall be reasonably required in order to fully perform and carry
out the terms and intent hereof.

9.3      Survival

         The representations, warranties, covenants and agreements herein and in
any document delivered pursuant hereto shall survive the Closing and remain in
full force and effect provided that no party hereto shall be liable in respect
of any representation or warranty unless the party seeking to rely upon such
representation or warranty shall have given notice to the party who made such
representation or warranty of its intention to make such claim on or before the
date 24 months following the Closing Date.

9.4      Time

         Time shall be of the essence in this Agreement.

9.5      Amendments

         This Agreement may only be amended by a written instrument signed by
the parties hereto.

9.6      Governing Law

         This Agreement shall be governed by, and be construed in accordance
with, the laws of the Province of Alberta and applicable laws of Canada but the
reference to such laws shall not, by conflict of laws rules or otherwise,
require the application of the law of any jurisdiction other than the Province
of Alberta.

<PAGE>

                                        9

9.7      Attornment

         Each party hereto hereby irrevocable attorns to the jurisdiction of the
Courts of the Province of Alberta in respect of all matters arising under or in
relation to this Agreement.

9.8      Severability

         If any one or more of the provisions or parts thereof contained in this
Agreement should be or become invalid, illegal or unenforceable in any respect
in any jurisdiction, the remaining provisions or parts thereof contained herein
shall be and shall be conclusively deemed to be, as to such jurisdiction,
severable therefrom and:

a.       the validity, legality or enforceability of such remaining provisions
         or parts thereof shall not in any way be affected or impaired by the
         severance of the provisions or parts thereof severed; and

b.       the invalidity, illegality or unenforceability of any provision or
         party thereof contained in this Agreement in any jurisdiction shall not
         affect or impair such provision or part thereof or any other provisions
         of this Agreement in any other jurisdiction.

9.9      Execution in Counterpart

         This Agreement may be executed in any number of counterparts with the
same effect as if all signatures to the counterparts had signed one document,
all such counterparts shall together constitute, and be construed as, one
instrument and each of such counterparts shall, notwithstanding the date of its
execution, be deemed to bear the date first above written.

9.10     Waiver

         No waiver by any party hereto shall be effective unless in writing and
any waiver shall affect only the matter, and the occurrence thereof,
specifically identified and shall not extend to any other matter or occurrence.

9.11     Enurement

         This Agreement shall enure to the benefit of and be binding upon the
parties hereto and their respective successors and assigns.

9.12     Assignment

         This Agreement may not be assigned by any party hereto without the
prior consent of the other parties hereto.

<PAGE>

                                       10

9.13     Reliance

         The parties hereto acknowledge and agree that they have entered into
this Agreement in reliance upon each of the representations, warranties,
covenants and agreements herein of the other party hereto.

         IN WITNESS WHEREOF the parties hereto have executed this Agreement as
of the date first above written.

                                   WI-LAN INC.

                                   Per: /s/ Hatim Zaghloul
                                        ----------------------------------
                                        Hatim Zaghloul
                                        Chairman and Chief Executive Officer

                                   MICROTEL INTERNATIONAL, INC.

                                   Per: /s/ Carmine T. Oliva
                                        ----------------------------------
                                        Carmine T. Oliva
                                        Chairman and Chief Executive Officer

                                 ACKNOWLEDGEMENT

         DTS hereby acknowledges that it is aware of the terms and conditions of
this Agreement and DTS is entering into the Convertible Debenture Purchase
Agreement dated December 29, 1999 between DTS and the Purchaser as material
consideration for and as an inducement to the Purchaser to enter into this
Agreement.

                                   Digital Transmission Systems, Inc.

                                   Per: /s/ Andres C. Salazar
                                        ----------------------------------
                                        Andres C. Salazar
                                        Chief Executive Officer

<PAGE>

                                   SCHEDULE A

                              REPRESENTATION LETTER

TO:      Wi-LAN Inc. (the "Corporation").

         In connection with the acquisition by MicroTel International, Inc.
("MicroTel") of 28,340 common shares (the "Common Shares") of the Corporation.
MicroTel hereby certifies and agrees for the benefit of the Corporation that:

1. it is authorized to consummate the purchase of the Common Shares;

2. it understands that the Common Shares have not been and will not be
registered under the Securities Act of 1933, as amended (the "U.S. Securities
Act") or under the securities ("blue sky") laws of any State of the United
States and that the sale contemplated hereunder is being made in reliance on a
private placement exemption to accredited investors;

3. it is purchasing the Common Shares for its own account and not with a view to
any resale, distribution or other disposition of the Common Shares, or any part
thereof in any transaction that would be in violation of the securities laws of
the United States or any State thereof, subject, nevertheless, to the
disposition of its property being at all times within its control;

4. it agrees that if it decides to offer, sell or otherwise transfer, pledge or
hypothecate all or any part of the Common Shares, it will not offer, sell or
otherwise transfer, pledge or hypothecate any or any part of such Common Shares
(other than pursuant to an effective registration statement under the U.S.
Securities Act and in compliance with any applicable State securities laws of
the United States), directly or indirectly unless:

a.       the sale is to the Corporation; or

b.       the sale is made outside the United States in accordance with the
         requirements of Rule 904 of Regulation S under the U.S. Securities Act
         and in compliance with applicable local rules and regulations; or

c.       the sale is made pursuant to the exemption from registration under the
         U.S. Securities Act provided by Rule 144 thereunder and local rules; or

d.       the Common Shares or any part thereof are sold in a transaction that
         does not require registration under the U.S. Securities Act or any
         applicable United States state laws and regulations governing the offer
         and sale of securities, and MicroTel has furnished to the Corporation
         an opinion to that effect of counsel of recognized standing reasonably
         satisfactory to the Corporation;

5. it understands and acknowledges that the Common Shares are "restricted
securities" as defined in Rule 144 under the U.S. Securities Act, and that upon
the original issuance thereof, and until such time as the same is no longer
required under applicable requirements of the U.S. Securities Act or state
securities laws, the certificates representing the Common Shares, and all
certificates issued in exchange therefor or in substitution thereof, shall bear
the following legend:

         THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
         UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED
         (THE "SECURITIES ACT") OR THE SECURITIES LAWS OF ANY STATE OF
         THE UNITED STATES. THE HOLDER HEREOF, BY PURCHASING SUCH
         SECURITIES, AGREES FOR THE BENEFIT OF THE CORPORATION THAT
         SUCH SECURITIES MAY BE OFFERED, SOLD OR OTHERWISE TRANSFERRED
         ONLY: (A) TO THE CORPORATION; (B) OUTSIDE THE UNITED STATES
         IN ACCORDANCE WITH RULE 904 AND, IF APPLICABLE, RULE 905 OF
         REGULATION S UNDER THE SECURITIES ACT; (C) PURSUANT TO THE

<PAGE>

                                       A-2

         EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED
         BY RULE 144 THEREUNDER AND IN COMPLIANCE WITH ANY APPLICABLE
         STATE SECURITIES LAWS OF THE UNITED STATES; OR (D) PURSUANT
         TO ANOTHER EXEMPTION FROM REGISTRATION AFTER PROVIDING A
         SATISFACTORY LEGAL OPINION TO THE CORPORATION. DELIVERY OF
         THIS CERTIFICATE MAY NOT CONSTITUTE "GOOD DELIVERY" IN
         SETTLEMENT OF TRANSACTIONS ON STOCK EXCHANGES IN CANADA. A
         NEW CERTIFICATE, BEARING NO LEGEND, DELIVERY OF WHICH WILL
         CONSTITUTE "GOOD DELIVERY" MAY BE OBTAINED FROM MONTREAL
         TRUST COMPANY OF CANADA UPON DELIVERY OF THIS CERTIFICATE AND
         A DULY EXECUTED DECLARATION, IN A FORM SATISFACTORY TO
         MONTREAL TRUST COMPANY OF CANADA AND THE CORPORATION, TO THE
         EFFECT THAT THE SALE OF THE SECURITIES REPRESENTED HEREBY IS
         BEING MADE IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER
         THE SECURITIES ACT;

provided that if the Corporation is a "foreign corporation" within the meaning
of Regulation S at the time of sale, and if the Common Shares or any part
thereof are being sold under paragraph 4(b) above, the legend may be removed by
providing a declaration to the transfer agent for the Common Shares to the
following effect (or as the Corporation may prescribe from time to time):

         "MicroTel: (A) acknowledges that the sale of the securities
         to which this declaration relates is being made in reliance
         on Rule 904 of Regulation S under the United States
         Securities Act of 1933, as amended; and (B) certifies that:
         (1) the offer of such securities was not made to a person in
         the United States and either: (a) at the time the buy order
         was originated, the buyer was outside the United States, or
         the seller and any person acting on its behalf reasonably
         believes that the buyer was outside the United States; or (b)
         the transaction was executed on or through the facilities of
         The Toronto Stock Exchange and neither the seller nor any
         person acting on its behalf knows that the transaction has
         been prearranged with a buyer in the United States; (2)
         neither the seller nor any person acting on its behalf
         engaged in any directed selling efforts in connection with
         the offer and sale of such securities; (3) the sale is bona
         fide and not for the purpose of "washing off" the resale
         restrictions imposed because the securities are "restricted
         securities" (as such term is defined in Rule 144(a)(3) under
         the 1933 Act); (4) the seller does not intend to replace the
         securities sold in reliance on Rule 904 of the 1933 Act with
         fungible unrestricted securities; and (5) the contemplated
         sale is not a transaction, or part of a series of
         transactions which, although in technical compliance with
         Regulation S, is part of a plan or scheme to evade the
         registration provisions of the 1933 Act. Terms used herein
         have the meanings given to them by Regulation S";

provided, further, that if any such Common Shares are being sold pursuant to
Rule 144 of the U.S. Securities Act, the legend may be removed by delivery to
Montreal Trust Company of Canada of an opinion of counsel, of recognized
standing reasonably satisfactory to the Corporation, to the effect that such
legend is no longer required under applicable requirements of the U.S.
Securities Act or state securities laws;

6. it has been afforded the opportunity to ask such questions as it has deemed
necessary of, and to receive answers from, representatives of the Corporation
concerning the terms and conditions of the issuance of the Common Shares;

7. it is experienced in evaluating companies such as the Corporation, has such
knowledge and experience in financial and business matters as to be capable of
evaluating the merits and risks of its investment in the Common Shares and has
the ability to suffer the total loss of its investment in the Common Shares;

<PAGE>

                                       A-3

8. it is an "accredited investor" within the meaning of Rule 501 of Regulation D
under the U.S. Securities Act;

9. it has been independently advised as to restrictions with respect to trading
in the Common Shares imposed by applicable securities legislation in the
jurisdiction in which it resides, confirms that no representation has been made
to it by or on behalf of the Corporation with respect thereto, acknowledges that
it is aware of the characteristics of the Common Shares, the risks relating to
an investment therein and of the fact that it may not be able to resell the
Common Shares except in accordance with limited exemptions under applicable
securities legislation and regulatory policy until expiry of the applicable hold
period and compliance with the other requirements of applicable law;

10. it understands that the sale and delivery of the Common Shares is
conditional upon such sale being exempt from the requirements as to the filing
of a prospectus and as to the delivery of an offering memorandum or upon the
issuance of such orders, consents or approvals as may be required to permit such
sale without the requirement of filing a prospectus or delivering an offering
memorandum; and it has not received or been provided with, nor has it requested,
nor does it have any need to receive, any offering memorandum, or any other
document (other than financial statements, interim financial statements or any
other document the content of which is prescribed by statute or regulation)
describing the business and affairs of the Corporation which has been prepared
for delivery to, and review by, it in order to assist it in making an investment
decision in respect of the Common Shares and it has not become aware of any
advertisement in printed media of general and regular paid circulation, radio or
television with respect to the distribution of the Common Shares;

11. it has relied solely upon the publicly available information relating to the
Corporation and not upon any verbal or written representation as to fact or
otherwise made by or on behalf of the Corporation;

12. it has such knowledge and experience in financial and business matters as to
be capable of evaluating the merits and risks of an investment in the Common
Shares and it is able to bear the economic risk of loss of its entire
investment;

13. it is a resident of and was offered the Common Shares in Ontario,
California;

14. it is purchasing Common Shares having an aggregate acquisition cost of not
less than Cdn. $97,000 and if it is a corporation, syndicate, partnership or
other form of unincorporated organization, it pre-existed the acquisition of the
Common Shares and has a bona fide purpose other than investment in the Common
Shares having an aggregate acquisition cost of not less than Cdn. $97,000 or, if
created to permit such investment, the individual share of the aggregate
acquisition cost for each participant is not less than Cdn. $97,000;

15. it understands and acknowledges that the Corporation has the right to
instruct the transfer agent for the Common Shares not to record a transfer by
any person in the United States without first being notified by the Corporation
that it is satisfied that such transfer is exempt from or not subject to
registration under the U.S. Securities Act and any applicable state securities
laws;

16. it understands that the investment in the Common Shares may have tax
consequences under the laws of the United States and of Canada and that it is
the sole responsibility of MicroTel to determine and assess such tax
consequences as may apply to its particular circumstances;

17. it understands and acknowledges that the Corporation (i) is under no
obligation to be or to remain a "foreign issuer", (ii) may not, at the time we
sell the Common Shares or at any other time, be a "foreign issuer", and (iii)
may engage in one or more transactions which could cause the Corporation not to
be a "foreign issuer"; and

<PAGE>

                                       A-4

18. it agrees that the above representations, warranties and covenants will be
true and correct both as of the execution of this Agreement and as of the
Closing Time and will survive the completion of the issuance of the Common
Shares.

19. The foregoing representations, warranties and covenants are made by MicroTel
with the intent that they be relied upon in determining its suitability as a
purchaser of Common Shares and MicroTel agrees to indemnify the Corporation
against all losses, claims, costs, expenses and damages or liabilities which it
may suffer or incur caused or arising from reliance thereon. MicroTel undertakes
to immediately notify the Corporation at Wi-LAN Inc., Suite 300, 801 Manning
Road N.E., Calgary, Alberta T2E 8J8, Attention: Hatim Zaghloul, Chairman and
Chief Executive Officer of any change in any statement or other information
relating to MicroTel set forth herein which takes place prior to the Closing
Time.

Date: December ____, 1999               MicroTel International, Inc.
                                        ----------------------------------
                                        Print name of Purchaser

                                        By:_______________________________
                                           Carmine T. Oliva
                                           Chairman and Chief Executive Officer

<PAGE>

                                   SCHEDULE B

                           THE TORONTO STOCK EXCHANGE
                 PRIVATE PLACEMENT QUESTIONNAIRE AND UNDERTAKING

                                  QUESTIONNAIRE

1.       DESCRIPTION OF TRANSACTION

         a.       Name of Issuer of the Securities - Wi-LAN Inc.

         b.       Number and Class of Securities to be Purchased - 28,340 Common
                  Shares

         c.       Purchase Price:  Deemed Price of U.S. $_____ per Common Share

2.       DETAILS OF PURCHASER

         a.       Name of Purchaser - MicroTel International, Inc.
                                      ----------------------------

         b.       Address -
                  4290 East Brickell Street
                  Ontario, CA   81761
                  ______________________________________________________________

         c.       Names and addresses of persons having a greater than 10%
                  beneficial interest in the purchaser -

                  ______________________________________________________________
                  ______________________________________________________________

3.       RELATIONSHIP TO ISSUER

         a.       Is the purchaser (or any person named in response to 2(c)
                  above) an insider of the issuer for the purposes of the
                  Ontario Securities Act (before giving effect to this private
                  placement)? If so, state the capacity in which the purchaser
                  (or person named in response to 2(c)) qualifies as an insider
                  -
                  ______________________________________________________________
                  ______________________________________________________________
                  ______________________________________________________________

         b.       If the answer to (a) is "no", are the purchaser and the issuer
                  controlled by the same person or company? If so, give details.
                  ______________________________________________________________
                  ______________________________________________________________

4.       DEALINGS OF PURCHASER IN SECURITIES OF THE ISSUER

         Give details of all trading by the purchaser, as principal, in the
         securities of the issuer (other than debt securities which are not
         convertible into equity securities), directly or indirectly, within the
         60 days preceding the date hereof -
                  ______________________________________________________________
                  ______________________________________________________________
                  ______________________________________________________________

<PAGE>

                                       B-2

                                   UNDERTAKING

TO:  The Toronto Stock Exchange

The undersigned has subscribed for and agreed to purchase, as principal, the
securities described in Item 1 of this Private Placement Questionnaire and
Undertaking.

The undersigned undertakes not to sell or otherwise dispose of any of the said
securities so purchased or any securities derived therefrom until either:

i.       a period of six months from the date of the closing of the transaction
         herein or for such period as is prescribed by applicable securities
         legislation, whichever is longer; or

ii.      a period ending on the date that a receipt for a final prospectus
         relating to the said securities or any securities derived therefrom has
         been issued by the Ontario Securities Commission,

without the prior consent of The Toronto Stock Exchange and any other regulatory
body having jurisdiction.

DATED AT Ontario, California            MicroTel International, Inc.
                                        ------------------------------------
this ____ day of December, 1999.        (Name of Purchaser)

                                        ------------------------------------
                                        (Authorized Signature)

                                        ------------------------------------
                                        Chairman and Chief Executive Officer
                                        (Official Capacity)

                                        Carmine T. Oliva
                                        ------------------------------------
                                        (please print here name of individual
                                        whose signature appears above, if
                                        different from name of purchaser
                                        printed above)

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