Digital PBX system

Details Digital PBX system Digital PBX system

1981-01-14

1983-06-28

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

179 18AD, H04J 300, H04J 600

Patent

active

043909825

ABSTRACT:
A small capacity digital PBX-key system which uses a single processor to control the system. Since only a single processor is employed, the system is interrupt controlled. In the system, there is a codec per line, the codecs each having sufficient programmability to eliminate the need for time slot interchangers. To provide as many as 64 (or more) channels usable for speech, tones and conferencing, two (or more) parallel, 32 channel busses are used as the group bus. The stations and trunks (ports) of the system have access to both busses through the codecs. Information is routed to one or another bus through the transmission of bus control bits from the processor.

REFERENCES:
patent: 4061880 (1977-12-01), Collins et al.
patent: 4288870 (1981-09-01), McDonald et al.

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