Duplex digital span conversion circuit arrangement

Details Duplex digital span conversion circuit arrangement Duplex digital span conversion circuit arrangement

1983-06-22

1985-08-06

Atkinson, Charles E.

Excavating

179 18EE, 370 16, G06F 1120

Patent

active

045340277

ABSTRACT:
In a telecommunications switching system, a thick film digital span conversion circuit is connected between a digital span and a switching network of the switching system. The circuit converts data, which is encoded for digital span use, to TTL logic coding for use by the switching network. The telecommunications switching system provides for duplicated data transmission through the switching network. Duplicated conversion circuits are employed in an active/standby configuration under CPU control. On-line replacement of a fault conversion circuit may be performed without a switching service interruption.

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W. N. Toy, Fault-Tolerant Design of Local ESS Processors, Proc. of the IEEE, vol. 66, No. 10, Oct. 1978, pp. 1126-1145.
R. J. Willett, Design of Recovery Strategies for a Fault-Tolerant No. 4 Electronic Switching System, The Bell System Tech. Journal, vol. 64, No. 10, Dec. 1982, pp. 3019-3041.

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