Time division multiplexed PABX communication switching system

US4087643A · kind A · utility

Assignee

• Chestel, Inc. · US

Inventors

• David L. Joslow · Chester, US
• Alan Bloch · New York, US
• Lincoln Henthorn · Chester, US
• Harold M. Straube · Chester, US

Key dates

• Filing date: Jun 13, 1977
• Grant date: May 2, 1978
• Expiry date: Jun 13, 1997

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M9/025
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A processor controlled communication switching system or PABX uses time division multiplexing with pulse width modulation of audio signals. Switching to establish communication paths between peripheral devices serviced by the system is distributed among the peripheral devices and controlled by command signals issued to the peripheral devices by a processor implemented common control. All peripheral devices transmit to the common control on a communication send line and receive signals from the common control on a communication receive line. The particular illustrated system services up to fifty two-way peripheral device ports and is inherently nonblocking.