4 1 form4_122001.txt FORM 4 FOR 12/2001 (DTS) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940 ( ) Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instructions 1(b). 1. Name and Address of Reporting Person* Wi-Lan Inc. 2891 Sunridge Way NE Calgary, Alberta T1Y 7K7 2. Issuer Name and Ticker or Trading Symbol Digital Transmission Systems, Inc. (DTSX) 3. I.R.S. or Social Security Number of Reporting Person, if an entity (Voluntary) 4. Statement for Month/Year December 2001 5. If Amendment, Date of Original (Month/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) ( ) Director (X) 10% Owner ( ) Officer (give title below) ( ) Other (specify below) 7. Individual or Joint/Group Filing (Check Applicable Line) (X) Form filed by One Reporting Person ( ) Form filed by More than One Reporting Person

Explanation of Responses: (3) The Reporting Person converted 3,240,000 shares of Series B Redeemable Convertible Preferred Stock on December 31, 2001 into 454,737 shares of common stock. (4) The Reporting Person converted 4,809,568 shares of Series C Redeemable Preferred Stock on December 31, 2001 into 2,330,217 shares of common stock. (5) The Reporting Person converted 10% Subordinated Convertible Debentures in the aggregate amount of $721,102 on December 31, 2001, at the conversion price of $1.00 per share, into 721,102 shares of common stock. /s/ Sayed-Amr El-Hamamsy January 10, 2002 ------------------------------- ----------------- **Signature of Reporting Person Date Sayed-Amr El-Hamamsy, Chief Operating Officer ** Intentional misstatements or omissions of acts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

DIGITAL TRANSMISSION SYSTEMS INC \DE\ 4