(19)

(11)

EP 0 247 144 A1

(12)

(43) Date of publication: 02.12.1987 Bulletin 1987/49 (21) Application number: 86907075.0 (22) Date of filing: 31.10.1986

(51) International Patent Classification (IPC):  H04L 29/ 06( . ) (86) International application number: PCT/US1986/002317 (87) International publication number: WO 1987/003444 (04.06.1987 Gazette 1987/12)

(84) Designated Contracting States: BE DE GB IT NL SE (30) Priority: 27.11.1985 US 19850802786 (71) Applicant: Hughes Aircraft Company Los Angeles California 90045-0066 (US)	(72) Inventor: RICE, Thomas, B. Laguna Beach, CA 92651 (US) (74) Representative: KUHNEN, WACKER & PARTNER  Alois-Steinecker-Strasse 22 D-85354 Freising D-85354 Freising (DE)