(19)

(11)

EP 0 097 180 A1

(12)

(43) Date of publication: 04.01.1984 Bulletin 1984/01 (21) Application number: 83900006.0 (22) Date of filing: 17.12.1982

(51) International Patent Classification (IPC):  H04J 1/ 00( . ) H04L 12/ 417( . ) H04B 7/ 26( . ) H04Q 7/ 28( . ) (86) International application number: PCT/AU1982/000210 (87) International publication number: WO 1983/002206 (23.06.1983 Gazette 1983/15)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 17.12.1981 AU 19810001986 (71) Applicant: XITEL PTY LIMITED Canberra City ACT 2601 (AU)	(72) Inventors: DAVIS, Barrie William Canberra ACT 2617 (AU) NORMAN, Michael Leslie Canberra, ACT 2603 (AU) (74) Representative: Hartley, David, et al  Withers & Rogers 4 Dyer's Buildings Holborn London, EC1N 2JT London, EC1N 2JT (GB)