End station digital transmission link relieving system

Communications: electrical – Continuously variable indicating – With meter reading

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17917535, 371 8, H04B 346, H04Q 900

Patent

active

043652476

ABSTRACT:
The system relieves a transmission working line included in a bidirectional digital link having N working lines and P spare lines between two end stations. In response to the detection of a transmission fault on the working line, the switching units of the stations perform a first exchange of order signals via a selected free spare line, and then a first switch-over of the data related to the faulty working line to the spare line. After the faulty working line has been repaired, to prevent continued data transmission along the spare line, a second exchange of order signals triggers a second switch-over so the system reverts to normal operation. The second exchange of order signals takes place along the repaired line while data related to the repaired line continues to be transmitted via the spare line. During the repair of the preceding faulty working line, a relief procedure of a high priority working line may take place via the selected spare line.

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
"Securisation et Supervision d'un Reseau Numerique Urbain", Chomette et al., L'Echo des Recherches, Jan. 1979, pp. 12-19.
"T1 Protection Switching", Wuertele, Nat'l. Telecommunications Conference Review, 1973, Record No. 2, 1975.

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