(19)

(11)

EP 0 712 556 A1

(12)

(43) Date of publication: 22.05.1996 Bulletin 1996/21 (21) Application number: 93918563.0 (22) Date of filing: 02.08.1993

(51) International Patent Classification (IPC):  H04L 7/ 00( . ) H04B 7/ 26( . ) H04J 99/ 00( . ) H04L 9/ 00( . ) H04B 7/ 185( . ) H04J 4/ 00( . ) H04L 7/ 10( . ) (86) International application number: PCT/US1993/007237 (87) International publication number: WO 1995/004415 (09.02.1995 Gazette 1995/07)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI NL (71) Applicant: INTERNATIONAL STANDARD ELECTRIC CORPORATION Wilmington, DE 19801 (US)	(72) Inventors: KENNEDY, John, B. Nutley, NJ 07110 (US) HEINEN, Joseph Montville, NJ 07045 (US) (74) Representative: Esser, Wolfgang  c/o Deutsche ITT Industries GmbH ITT Regional Patent Office-Europe Hans-Bunte-Strasse 19 D-79108 Freiburg D-79108 Freiburg (DE)