(19)

(11)

EP 0 542 976 A1

(12)

(43) Date of publication: 26.05.1993 Bulletin 1993/21 (21) Application number: 92912387.0 (22) Date of filing: 05.06.1992

(51) International Patent Classification (IPC):  H04B 14/ 04( . ) (86) International application number: PCT/AU1992/000265 (87) International publication number: WO 1992/022152 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 07.06.1991 AU 19910006578 (71) Applicant: AUSTRALIAN AND OVERSEAS TELECOMMUNICATIONS CORPORATION LIMITED Sydney, NSW 2000 (AU)	(72) Inventor: PORTELLI, Joseph, F. Marayong, NSW 2148 (AU) (74) Representative: Meddle, Alan Leonard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)