Ring transmission system and squelch method used for same

Details Ring transmission system and squelch method used for same Ring transmission system and squelch method used for same

1996-09-11

2000-09-19

Patel, Ajit

Multiplex communications

Fault recovery

Bypass an inoperative station

H04J 116, H04J 314

Patent

active

06122250&

ABSTRACT:
A ring transmission system of a bi-directional line switched ring (BLSR) type comprising nodes (A) to (F) connected by ring transmission lines RL, wherein the nodes (A) to (F) have modified squelch tables [A] to [F] and squelch decision units. The ring topology is built by transmitting a ring topology frame and inserting the ID of each node in that frame. Each of the nodes creates a modified squelch table comprised of modified node IDs given to the nodes in a rising order of connection starting from itself using itself as "0" or another reference value. Whether or not to perform a squelch operation is determined by comparing the magnitude of the modified node IDs of the nodes which signals cannot reach at the time of occurrence of a failure and the modified node IDs in the modified squelch table. This enables the squelch processing to be performed at a high speed.

REFERENCES:
patent: 5278824 (1994-01-01), Kremer
patent: 5408610 (1995-04-01), Arakawa
patent: 5442620 (1995-08-01), Kremer
patent: 5566178 (1996-10-01), Butter et al.

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