| 摘要 |
A protection system, a virtual concatenation processing block, a node and a ring network, in which bands of ring network system are effectively utilized when no failure occurs on the network, and all data can be transmitted to destinations using an LCAS function even when failure occurs. When no failure occurs on the network, a working channel and a protection channel are treated as a continuous band by the LCAS function and working traffic is transmitted using the band by a virtual concatenation function. When failure occurs on the network, the channels of paths prepared by cooperating a layer 1 protection function and the LCAS function to avoid a troubled part are used for data transmission, and the working traffic is transmitted through the band by the virtual concatenation function.
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