Multiplex unit with means for responding to signal loss in one o

Multiplex communications – Wide area network – Packet switching

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370 13, 370 55, H04J 307, H04J 314

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active

043028390

ABSTRACT:
A multiplex unit for multiplexing plesiochronous digital signals has a monitoring device for signalling the loss of input signals on one or more channels being multiplexed. Upon recognition of a lost signal in one or more channels, an alarm indication signal is substituted for the information signals in that channel and a synthetic justification signal is produced which replaces the justification information in such channel. The synthetic justification information gives the alarm indication signal the correct pulse repetition rate in the outgoing channel of the multiplex unit.

REFERENCES:
patent: 3985963 (1976-10-01), Boutmy
patent: 4017688 (1977-04-01), Callens
patent: 4060698 (1977-11-01), Birnie
patent: 4105869 (1978-08-01), Aveneau
patent: 4107469 (1978-08-01), Jenkins
The Post Office Electrical Engineer's Journal; Jul. 1976; "Multiplexing for A Digital Main Network" by Brigham et al.; pp. 93-102.

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