BROADBAND TECHNOLOGIES INC /DE/
424B3, 1997-05-05
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1
 
                                Prospectus Supplement filed under Rule 424(b)(3)
                                                       Registration No. 333-9661
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED SEPTEMBER 17, 1996)
 
                          BROADBAND TECHNOLOGIES, INC.
 
                                  $115,000,000
 
               5% CONVERTIBLE SUBORDINATED NOTES DUE MAY 15, 2001
                   (INTEREST PAYABLE MAY 15 AND NOVEMBER 15)
 
                                      AND
 
   2,772,420 SHARES OF COMMON STOCK, PAR VALUE $.01 PER SHARE, ISSUABLE UPON
              CONVERSION OF SUCH 5% CONVERTIBLE SUBORDINATED NOTES
 
                             ---------------------
 
     The Prospectus, dated September 17, 1996 (the "Prospectus"), relating to
the offering for resale of up to $115,000,000 aggregate principal amount of
outstanding 5% Convertible Subordinated Notes, due May 15, 2001 (the "Notes") of
BroadBand Technologies, Inc. ("BroadBand"), and the 2,772,420 shares of Common
Stock, par value $0.01 per share, of BroadBand that are issuable upon conversion
of the Notes, as supplemented by Prospectus Supplements dated October 31, 1996,
December 3, 1996, January 7, 1997, February 3, 1997, March 3, 1997, and March
31, 1997, is hereby supplemented as set forth below.
 
     1) "Public Employees' Retirement Association of Colorado" is added to the
        table of Selling Holders on page 30 of the Prospectus, together with the
        following information as of a recent date prior to the date of this
        Prospectus Supplement: (i) Principal Amount of Notes Owned and Principal
        Amount of Notes Offered Hereby of $1,000,000, (ii) Common Stock Owned
        Prior to Offering of 27,308 and (iii) Common Stock Offered Hereby of
        24,108.
 
     2) "The Northwestern Mutual Life Insurance Company" is added to the table
        of Selling Holders on page 30 of the Prospectus, together with the
        following information as of a recent date prior to the date of this
        Prospectus Supplement: (i) Principal Amount of Notes Owned and Principal
        Amount of Notes Offered Hereby of $6,000,000 and (ii) Common Stock Owned
        Prior to Offering and Common Stock Offered Hereby of 144,648.
 
     3) "Bear Stearns Securities Corp." is added to the table of Selling Holders
        on page 30 of the Prospectus, together with the following information as
        of a recent date prior to the date of this Prospectus Supplement: (i)
        Principal Amount of Notes Owned and Principal Amount of Notes Offered
        Hereby of $300,000 and (ii) Common Stock Owned Prior to Offering and
        Common Stock Offered Hereby of 7,232.
 
     4) "Lazard Freres & Co. LLC" is added to the table of Selling Holders on
        page 30 of the Prospectus, together with the following information as of
        a recent date prior to the date of this Prospectus Supplement: (i)
        Principal Amount of Notes Owned and Principal Amount of Notes Offered
        Hereby of $600,000 and (ii) Common Stock Owned Prior to Offering and
        Common Stock Offered Hereby of 14,465.
 
     5) "Goldman, Sachs & Co." is added to the table of Selling Holders on page
        30 of the Prospectus, together with the following information as of a
        recent date prior to the date of this Prospectus Supplement: (i)
        Principal Amount of Notes Owned and Principal Amount of Notes Offered
        Hereby of $1,000,000 and (ii) Common Stock Owned Prior to Offering and
        Common Stock Offered Hereby of 24,108.
 
             The date of this Prospectus Supplement is May 5, 1997.


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