Digital interface of an integrated subscriber line interface circuit

US4881226A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Lechner · Otterfing, DE
• Hans-Werner Rudolf · Munich, DE
• Harald Stader · Munich, DE
• Norbert Wingerath · Munich, DE
• Christopher C. A. Priest · Maidenhead, GB
• Nigel P. Dyer · London, GB
• Robert K. P. Galpin · Knutsford, GB
• Pierre Albouy · Lannion, FR
• Robert Le Gougnec · Lannion, FR
• Ramatchandirane Nadaradjane · Lannion, FR
• Marcello Manca · Milano, IT
• Virgilio Mosca · Milano, IT
• Antonio Nicastro · Milano, IT

Key dates

• Filing date: Jan 25, 1988
• Grant date: Nov 14, 1989
• Expiry date: Jan 25, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q11/0428
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A digital interface of an integrated subscriber line interface circuit is provided. The interface serves for the connection of a signal processor unit. Individual connections are used as signal inputs in signal entry operation of the interface, and as signal outputs in signal transmission operation. Other connections are used as signal inputs in both operating mode, but receive different signals in each operating mode. One group of connections includes two registers with respective associated decoders to enable switching from one to the other, so that the number of operating instructions that can be represented by means of binary signal value combinations applied to the connections is doubled.