Subscriber terminal circuit for connecting an analog subscriber line to a digital switching center

US6052437A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Paul Kunisch · Puchheim, DE
• Roland Krimmer · Germering, DE

Key dates

• Filing date: Sep 18, 1997
• Grant date: Apr 18, 2000
• Expiry date: Sep 18, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q2213/1316
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An interface circuit with integrated test functions relating to the subscriber line, with a test circuit realized in the simplest case by an ohmic resistance, and comprising a relay circuit having two changeover contacts by means of which in one switching position the leads of the subscriber line are connected with the interface circuit, and in the other switching position the subscriber line is disconnected and the test circuit is connected to the interface circuit.