Arrangement for subscriber circuits utilizing digital time division multiplex telecommunication installations and particularly for PCM local exchanges

US4309766A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Lechner · Otterfing, DE
• Hermann Monat · Weßling, DE

Key dates

• Filing date: Aug 30, 1979
• Grant date: Jan 5, 1982
• Expiry date: Aug 30, 1999

Classification

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

Abstract

Subscriber circuits used for connecting analog operated subscriber line to digital switching networks have analog circuit portions which are individually associated with the individual subscriber lines and also have circuits for coding and decoding signals. Digital control and interface circuits are commonly associated with a plurality of such subscriber circuits and in the present invention the analog circuit portions which are associated with a sub-group of a subscriber line and circuit for coding and decoding are combined into sub-modules such as printed circuit boards which are mounted on a common carrier plate at a spacing from the main portion of the plate so that the carrier plate forms the circuit carrier for the paths and components of the digital portion of the circuits.