(19)

(11)

EP 0 364 451 A1

(12)

(43) Date of publication: 25.04.1990 Bulletin 1990/17 (21) Application number: 88902850.0 (22) Date of filing: 26.03.1988

(51) International Patent Classification (IPC):  H04L 7/ 033( . ) (86) International application number: PCT/EP1988/000272 (87) International publication number: WO 1989/009520 (05.10.1989 Gazette 1989/24)

(84) Designated Contracting States: BE (71) Applicants: BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap B-2018 Antwerp (BE) Alcatel N.V. NL-1077 XX Amsterdam (NL)	(72) Inventors: SWINNEN, Marc, Leander, Louis, Marie B-2018 Antwerp (BE) BARRI, Peter, Irma, August B-2820 Bonheiden (BE) (74) Representative: Vermeersch, Robert, et al  BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Patent Department Francis Wellesplein 1 B-2018 Antwerpen B-2018 Antwerpen (BE)