(19)

(11)

EP 0 920 754 A2

(12)

(43) Date of publication: 09.06.1999 Bulletin 1999/23 (21) Application number: 98934273.0 (22) Date of filing: 24.06.1998

(51) International Patent Classification (IPC):  H04L 25/ 14( . ) (86) International application number: PCT/US1998/013948 (87) International publication number: WO 1998/059454 (30.12.1998 Gazette 1998/52)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 25.06.1997 US 19970882681 (71) Applicant: Teltrend Inc. St. Charles, IL 60174 (US)	(72) Inventors: SHEETS, Laurence, L. St. Charles, IL 60175 (US) GARCIA, Francis, X. Aurora, IL 60506 (US) (74) Representative: Vossius, Volker, Dr., et al  Dr. Volker Vossius, Patentanwaltskanzlei - Rechtsanwaltskanzlei, Holbeinstrasse 5 81679 München 81679 München (DE)