Application of SW SNCP

This section describes the application of the SW SNCP.

Figure 1 shows engineering project T which is a ring network by station A, B, C, and D. Station A, B, C, and D are OADM stations. Service of Client b between station A and station B adopts SW SNCP protection realized by dual fed and selective receiving.

Figure 1 Application of the SW SNCP (normal)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 1.

In normal cases, at the transmitting end, service of client b is transmitted in the working channel and the protection channel respectively through the OTU board 2 and OTU board 1. At the receiving end, only the working cross connection corresponding to OTU board 4 is enabled and the protection cross connection corresponding to OTU board 3 is disconnected.

Figure 2 Application of the SW SNCP (switching)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 2.

At the transmitting end, service of client b is transmitted in the protection channel through OTU board 1. At the receiving end, the working cross connection corresponding to OTU board 4 is disconnected. The protection cross connection corresponding to OTU board 3 is enabled. The protection channel works.