Circuit arrangement for telecommunications exchanges

US5043978A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Werner Nagler · Starnberg, DE
• Fritz Hlawa · Deisenhofen, DE
• Lothar Schmidt · Bochum, DE

Key dates

• Filing date: Sep 21, 1989
• Grant date: Aug 27, 1991
• Expiry date: Sep 21, 2009

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q11/0407
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In a circuit arrangement for telecommunications exchanges, including PCM time division multiplex telephone exchanges with a central switching array and connected subordinate switching arrays, line terminal groups connected to a central switching network by way of link connections where each line terminal group has its own subordinate switching array and a group control unit are arranged in pairs. Within each line terminal group, there is terminal equipment for connection of outside lines on the one hand, and on the other hand link terminating circuits for the link connections to the central switching array can also be switched from the subordinate switching array of the respective line terminal group to that of the partner line terminal group. Terminal equipment and link terminating circuits as well a subordinate control units with subordinate switching arrays are equipped with three internal power supply systems and three internal clock pulse supply systems per line terminal group. The terminal equipment, subordinate control system with subordinate switching array and link terminating circuits all operate in plesiochronous operation. In a switching operation, the clock pulse suppl…