(19)

(11)

EP 1 072 122 A1

(12)

(43) Date of publication: 31.01.2001 Bulletin 2001/05 (21) Application number: 99906939.6 (22) Date of filing: 11.02.1999

(51) International Patent Classification (IPC)7: H04L 1/00, H04L 1/12, H03M 13/00 (86) International application number: PCT/US9902/995 (87) International publication number: WO 0048/353 (17.08.2000 Gazette 2000/33)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: Hughes Electronics Corporation El Segundo,California 90245-0956 (US)	(72) Inventors: HAMMONS, A., Roger, Jr. North Potomac, MD 20878 (US) EROZ, Mustafa Montgomery Village, MD 20886 (US) (74) Representative: Lindner, Michael, Dipl.-Ing. et al Witte, Weller & Partner,Patentanwälte,Postfach 105462 70047 Stuttgart 70047 Stuttgart (DE)