Application of ODUk 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 b between station A and station B adopts ODUk SNCP protection realized by dual fed and selective receiving.

Figure 1 Application of the ODUk SNCP (normal)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 1.

In normal cases, at the transmitting end, the client service 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 ODUk SNCP (switching)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 2.

At the transmitting end, client service 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.