Bypass for telephone switching system

Details Bypass for telephone switching system Bypass for telephone switching system

1991-08-28

1993-05-25

Dwyer, James L.

Telephonic communications

Centralized switching system

Call distribution to operator

379221, 379279, 379 32, H04M 358, H04M 100

Patent

active

052146928

ABSTRACT:
A digital bypass unit for a PBX or ACD telephone system having T1 spans provides the capability to place and answer calls on a digital T1 span in the event of a system failure or power failure. The bypass unit permits the bypass of the failed system, connecting T1 channels directly to digital telephone sets, and is automatically activated in the event of power or system failure. Queueing and distribution of incoming calls are both provided when the system is in the bypass mode.

REFERENCES:
patent: 4455645 (1984-06-01), Mijioka et al.
patent: 4575584 (1986-03-01), Smith et al.
patent: 4625082 (1986-11-01), Kelly
patent: 4653088 (1987-03-01), Budd et al.
patent: 4800583 (1989-01-01), Theis
patent: 4943999 (1990-07-01), Ardon
Electrical Communication article entitled "ITT 1240 Digital Exchange", vol. 54, No. 3, 1979.
Proceedings of the IEEE, vol. 66, No. 10, Oct. 1978 "Fault-Tolerant DEsign of Local ESS Processors".

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