(19)

(11)

EP 0 465 476 A1

(12)

(43) Date of publication: 15.01.1992 Bulletin 1992/03 (21) Application number: 90903581.0 (22) Date of filing: 22.02.1990

(51) International Patent Classification (IPC):  G01R 21/ 133( . ) (86) International application number: PCT/AU1990/000067 (87) International publication number: WO 1990/012325 (18.10.1990 Gazette 1990/24)

(84) Designated Contracting States: BE CH DE DK FR GB LI LU NL SE (30) Priority: 04.04.1989 AU 19890003471 (71) Applicant: ALCATEL AUSTRALIA LIMITED Alexandria, NSW 2015 (AU)	(72) Inventor: STANBURY, Evan, John Lakemba, NSW 2195 (AU) (74) Representative: Weinmiller, Jürgen  Lennéstrasse 9 Postfach 24 D-82336 Feldafing D-82336 Feldafing (DE)