Method for testing the line connection before switching from a telephone switching center to be placed out of service to a new digital telephone switching center to be placed into service

US5274692A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Lechner · Otterfing, DE
• Tom Miller · Plano, US

Key dates

• Filing date: Aug 14, 1991
• Grant date: Dec 28, 1993
• Expiry date: Aug 14, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q1/149
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Given simultaneous connection of the subscriber line circuits by way of a main distributor to a new switching center and to an existing or old switching center, the subscriber terminals are successively selected proceeding from the new switching center and the old switching center produces connections from a test terminal to these subscriber line circuits. A tone generator of the new switching center supplies a test code word by way of these connections that proceeds via a termination-associated test connection contact and via an external test bus to a code character receiver of the new switching center and is checked therein for coincidence with the test code word.