Path protection switch ring system for line saving even though l

Details Path protection switch ring system for line saving even though l Path protection switch ring system for line saving even though l

1996-10-29

1998-08-04

Jung, Min

Multiplex communications

Fault recovery

Bypass an inoperative station

370228, H04J 314

Patent

active

057905207

ABSTRACT:
A path protection switch ring system has a working line, a protection line, and a plurality of add/drop multiplexers. The add/drop multiplexer has a path-switch unit, an unequipped signal detection unit, and a path-switch control unit. The path-switch unit is used to switch between the working line and the protection line. The unequipped signal detection unit is used to detect an unequipped signal which is output when line setting has not been carried out. The path-switch control unit is used to control the switching operation of the path-switch unit when the unequipped signal is detected.

REFERENCES:
patent: 4593154 (1986-06-01), Takeda et al.
patent: 5081619 (1992-01-01), Nagata
patent: 5187706 (1993-02-01), Frankel et al.
patent: 5218600 (1993-06-01), Schenkyr et al.
patent: 5311501 (1994-05-01), Takatsu
patent: 5317198 (1994-05-01), Husbands
patent: 5446725 (1995-08-01), Ishiwatari
patent: 5533006 (1996-07-01), Uchida

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