Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center

US4905227A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Lechner · Otterfing, DE
• Norbert Wingerath · Munich, DE

Key dates

• Filing date: Mar 3, 1988
• Grant date: Feb 27, 1990
• Expiry date: Mar 3, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M3/005
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center is disclosed. In the case of reception of the same information on the same time slot allocation via a number of subscriber line interface circuits, a transmit time slot as well as a receive time slot is alloted, but access of the transmit driver stages of the subscriber line interface circuits to the bus conductors leading to the switching center is prevented in order to avoid damaging interacting final stages in the transmit driver stages of the subscriber line interface circuits.