Method for monitoring information transmission in connected through four-wire connecting paths, more particularly semipermanently connected through connecting paths in digital time multiplex exchanges

US4821256A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Lothar Schmidt · Bochum, DE
• Gerhard Schaich · Munich, DE
• Wolfram Ernst · Munich, DE

Key dates

• Filing date: Jun 25, 1987
• Grant date: Apr 11, 1989
• Expiry date: Jun 25, 2007

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q11/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

The switching network is tested by comparison of bit streams coming from the double part switching network parts; other parts of the exchange are tested by parity checking. Evaluation takes place at a central location; when a parity error is found in the transmission in a direction of transmission, the parity bit generated for transmission in the other direction of transmission is falsified.