Self-healing system for a ring link with spare ring link means

Details Self-healing system for a ring link with spare ring link means Self-healing system for a ring link with spare ring link means

1991-06-07

1992-01-14

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 8512, H04B 300

Patent

active

050814524

ABSTRACT:
The stations (S1to SN) are interconnected in series by a ring (A), and the system of the invention includes a spare ring (AS) interconnecting the stations in series, together with two self-healing circuits (CAM, CAV) in each station coupler (CS) between the two connectors (8, 9) of the coupler and its insertion relay (RI). The couplers are interconnected by cords (10; 11) each containing the ring (A), the spare ring (AS), and two detection links (12, 13). Each self-healing circuit includes a relay (6) and a relay control circuit (7) connected to a detection link whose other end is connected to ground in another self-healing circuit. Each relay (6) has fixed contacts (a1, a2, b1, b2), a first moving contact (C1) connected to the insertion relay (RI), and a second moving contact (C2). The second moving contacts (C2) of the two self-healing circuits (CAM, CAV) in the same coupler are interconnected by a spare link (L). In each self-healing circuit, the moving contacts co-operate with the fixed contacts so that in a rest position they interconnect the insertion relay (RI) with the ring (A) and the spare link (L) with the spare ring (AS), and in a working position they connect the insertion relay (RI) to the spare link (L).

REFERENCES:
patent: 4417242 (1983-11-01), Bapst et al.
patent: 4723241 (1988-02-01), Grobel et al.
patent: 4769807 (1988-09-01), Niwa et al.
patent: 4777330 (1988-10-01), Nakayashiki et al.
patent: 4847610 (1989-07-01), Ozawa et al.
patent: 4862158 (1989-08-01), Keller et al.
patent: 4905230 (1990-02-01), Madge et al.
patent: 4937823 (1990-06-01), Bekki et al.
Patent Abstracts of Japan, vol. 8, No. 226 (E-272) [1663], Oct. 17, 1984; & JP-A-59107665 (Hitachi: Seisakusho K.K.), 6/21/1985.

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