(19)

(11)

EP 0 239 591 A1

(12)

(43) Date of publication: 07.10.1987 Bulletin 1987/41 (21) Application number: 86905676.0 (22) Date of filing: 23.09.1986

(51) International Patent Classification (IPC):  H04B 10/ 272( . ) H04H 20/ 69( . ) (86) International application number: PCT/AU1986/000277 (87) International publication number: WO 1987/002205 (09.04.1987 Gazette 1987/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 25.09.1985 AU 19850002612 (71) Applicant: AUSTRALIAN TELECOMMUNICATIONS COMMISSION Melbourne, VIC 3000 (AU)	(72) Inventor: McGREGOR, Ian, Murray ''Tanglewood'' Monbulk, VIC 3793 (AU) (74) Representative: Miller, Joseph, et al  J. MILLER & CO. 34 Bedford Row, Holborn London WC1R 4JH London WC1R 4JH (GB)