Digital interface between at least two subscriber line interface circuits and a processing unit

US4893309A · 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
• Marcello Manca · Milano, IT
• Virgilio Mosca · Milano, IT
• Antonio Nicastro · Milano, IT
• Pierre Albouy · Lannion, FR
• Robert Le Gougnec · Lannion, FR
• Ramatchandirane Nadaradjane · Lannion, FR

Key dates

• Filing date: Jan 25, 1988
• Grant date: Jan 9, 1990
• 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 between at least two subscriber line interface circuits and a processing unit is described. The interface is configured in the form of a parallel interface. The level of an input/output register and of a control register is allocated, as needed, to the connections of the processing unit. These connections can be operated selectively as inputs or outputs. They can also be operated in two modes, depending upon which type of subscriber line interface circuit (SLIC) is connected. The connections of the last-mentioned units are partially operable as inputs or outputs and partially operable only as inputs but in the input case, selectively for various types of input signals.