(19)

(11)

EP 1 382 157 A1

(12)

(43) Date of publication: 21.01.2004 Bulletin 2004/04 (21) Application number: 01932731.1 (22) Date of filing: 26.04.2001

(51) International Patent Classification (IPC)7: H04L 12/28, H04L 12/24 (86) International application number: PCT/US2001/013771 (87) International publication number: WO 2002/089417 (07.11.2002 Gazette 2002/45)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (71) Applicant: General Instrument Corporation Horsham,Pennsylvania 19044 (US)	(72) Inventors: MOORE, Richard, B., Jr. Harleysville, PA 19438 (US) BLUM, William, H. Harleysville, PA 19438 (US) (74) Representative: Cooper, John et al Murgitroyd & Company165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)