Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones

US4740955A · kind A · utility

Assignees

• TIE Communications, Inc. · US
• Nitsuko Corporation · JP

Inventors

• Joseph W. Litterer · Fairfield, US
• John E. Anderson
• Gary William Mason · Rockledge, US
• Minoru Shigematsu · Kawasaki, JP
• Fumikazu Hamatani

Key dates

• Filing date: Oct 29, 1986
• Grant date: Apr 26, 1988
• Expiry date: Oct 29, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q2213/13299
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A communications system having a common equipment unit and a plurality of telephone station sets coupled to the common equipment unit comprises a common equipment unit having at least one trunk interface for coupling at least one central office telephone line to the common equipment unit and an analog to digital converter for converting analog signals on the telephone line into digital form, and at least one station interface coupling the common equipment unit to at least one of the station sets by a single wire pair. A plurality of buses couple the trunk interface and the station interface together, the plurality of buses comprising at least one digital voice bus for carrying digitized voice signals, a digital data bus for carrying digital data signals originating from a digital data device and a control data bus for carrying digital data comprising control information for controlling functions in the station sets for routing the data on the digital voice bus and the digital data bus between at least one of the station sets and the telephone line.