Digital transmission link relief triggering system

Details Digital transmission link relief triggering system Digital transmission link relief triggering system

1981-01-07

1982-12-21

Robinson, Thomas A.

Communications: electrical

Continuously variable indicating

With meter reading

1791753S, 370 16, 371 8, H04B 346, H04Q 900, G06F 1100

Patent

active

043652484

ABSTRACT:
The system triggers the relief of a working line amongst N working lines in a bidirectional digital transmission link having at least one spare line. The link is interconnected between two end stations (A, B) which allow a switch-over between a faulty working line and a spare line. The relief of a working line is triggered in response to the detection of an alarm indication signal (AIS) delivered by any end or intermediary terminal included in the working line. An AIS coming from outside the link and related to the working line is detected in an end station and replaced by a switching inhibiting signal that is transmitted via the working line, or perhaps via a spare line, should the working line be faulty and previously relieved, and that is detected in the other station and then replaced by an AIS transmitted outside the link in relation to the other station.

REFERENCES:
patent: 3864533 (1975-02-01), Erlund
patent: 4009469 (1977-02-01), Boudreau et al.
patent: 4068105 (1978-01-01), Jain et al.
patent: 4159470 (1979-06-01), Strojny et al.
patent: 4264893 (1981-04-01), Hutch
"Securization et Supervision d'un Reseau Numerigue Urbain", Chomette et al., L'Echo des Recherches, Jan. 1979, pp. 12-19.

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