(19)

(11)

EP 0 484 476 A1

(12)

(43) Date of publication: 13.05.1992 Bulletin 1992/20 (21) Application number: 91907940.0 (22) Date of filing: 09.04.1991

(51) International Patent Classification (IPC):  H04B 1/ 16( . ) H04B 1/ 30( . ) H04L 27/ 14( . ) H03G 3/ 20( . ) H04B 7/ 005( . ) H04L 27/ 22( . ) (86) International application number: PCT/US1991/002409 (87) International publication number: WO 1991/017606 (14.11.1991 Gazette 1991/26)

(84) Designated Contracting States: DE DK ES FR GB IT SE (30) Priority: 27.04.1990 US 19900515900 (71) Applicant: MOTOROLA INC. Schaumburg Illinois 60196 (US)	(72) Inventors: ARENS, John, W. Cary, IL 60013 (US) DORTH, David, E. Palatine, IL 60067 (US) KEPLER, James, F., M. Northbrook, IL 60062 (US) (74) Representative: Ibbotson, Harold, et al  Motorola European Intellectual Property Midpoint Alencon Link Basingstoke Hampshire RG 21 1PL Basingstoke Hampshire RG 21 1PL (GB)