(19)

(11)

EP 0 221 090 A1

(12)

(43) Date of publication: 13.05.1987 Bulletin 1987/20 (21) Application number: 86902134.0 (22) Date of filing: 06.03.1986

(51) International Patent Classification (IPC):  H04M 9/ 00( . ) H04M 9/ 02( . ) H04M 1/ 723( . ) H04Q 3/ 58( . ) (86) International application number: PCT/US1986/000477 (87) International publication number: WO 1986/006570 (06.11.1986 Gazette 1986/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL (30) Priority: 25.04.1985 US 19850726733 (71) Applicant: International Standard Electric Corporation New York New York 10022 (US)	(72) Inventors: MIDDLETON, Francisco, A. Newtown, CT 06470 (US) ZELLER, David, A., Jr. Brookfield, CT 06804 (US) (74) Representative: Pothet, Jean  c/o ITT Data Systems France S.A. Tour Maine Montparnasse 33, avenue du Maine F-75755 Paris Cédex 15 F-75755 Paris Cédex 15 (FR)