(19)

(11)

EP 0 601 013 A1

(12)

(43) Date of publication: 15.06.1994 Bulletin 1994/24 (21) Application number: 92918287.0 (22) Date of filing: 21.08.1992

(51) International Patent Classification (IPC):  H04J 3/ 06( . ) H04J 3/ 14( . ) H04L 29/ 06( . ) H04J 3/ 12( . ) H04J 3/ 16( . ) (86) International application number: PCT/US1992/007030 (87) International publication number: WO 1993/004541 (04.03.1993 Gazette 1993/06)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 26.08.1991 US 19910749897 (71) Applicant: General DataComm, Inc. Middlebury Connecticut 06762-1229 (US)	(72) Inventors: DUGGAN, Robert, J. Monroe, CT 06468 (US) HO, Tat, N. New Milford, CT 06776 (GB) (74) Representative: Gibson, Stewart Harry  URQUHART-DYKES & LORD, Three Trinity Court, 21-27 Newport Road Cardiff CF2 1AA Cardiff CF2 1AA (GB)