Ring transmission system and method of controlling squelch in ring transmission system

摘要: A ring transmission system includes a plurality of nodes that are connected to each other form by bi-directional line switched (BLSR) method. The further channel-adding node adds channel the ring, and transmits identification (ID) on when creating squelch table; channel-dropping drops from stores ID received directly or through in table node, wherein detects failed which signal does not reach among one more channels dropped at based information about location failure ring-topology managed stored occurs inserts into channel. By having above-described structure, is capable executing control upper-level lower-level such as STS1 VT1 efficiently with simple structure control.