(19)

(11)

EP 0 853 851 A1

(12)

(43) Date of publication: 22.07.1998 Bulletin 1998/30 (21) Application number: 96933990.0 (22) Date of filing: 02.10.1996

(51) International Patent Classification (IPC):  H04L 12/ 56( . ) (86) International application number: PCT/US1996/015737 (87) International publication number: WO 1997/013346 (10.04.1997 Gazette 1997/16)

(84) Designated Contracting States: DE FR GB (30) Priority: 03.10.1995 GB 19950020147 (71) Applicant: General DataComm, Inc. Middlebury, CT 06762-1299 (US)	(72) Inventor: JONES, Trevor Maldon,Essex CM9 7YY (GB) (74) Representative: Kazi, Ilya, et al  Mathys & Squire, 100 Gray's Inn Road London WC1X 8AL London WC1X 8AL (GB)