Time division multiplexed computerized branch exchange

Details Time division multiplexed computerized branch exchange Time division multiplexed computerized branch exchange

1984-05-22

1986-12-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 89, 370 67, H04J 302, H04J 316

Patent

active

046270507

ABSTRACT:
An improved architecture for a computerized branch exchange particularly for a time division multiplexed bus used in the exchange. An intershelf bus includes a unidirectional source bus which receives signals from expanders and a unidirectional destination bus which transmits signals to the expanders. The expanders, through another bus, communicate with line cards which interface with telephone station sets, commercial lines, etc. A time division multiplexed controller updates distributed connection tables contained in each of the expanders and controls the flow of data onto and from the unidirectional buses. The distributed connection tables eliminate the need to broadcast addresses during each time slot. The arrangement is particularly useful in reducing blocking associated with prior art bidirectional buses.

REFERENCES:
patent: 2723309 (1955-11-01), Lair et al.
patent: 3732374 (1973-05-01), Rocher et al.
patent: 3851104 (1974-11-01), Willard et al.
patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4210780 (1980-07-01), Hopkins et al.

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