Application of DLAG

This section describes the application of the DLAG.

See Figure 1 and Figure 2. The project is a ring network that consists of four stations named A, B, C, and D. Station A, B, C, and D are OADM stations. An SW SNCP protection group and a DLAG protection group are configured at station A. An SW SNCP protection group is configured at station B.

NOTE:

In Figure 1 and Figure 2, the boards numbered 1 and 2 are the TBE boards. Board 1 is the working board of the DLAG protection and board 2 is the protection board of the DLAG protection. The boards numbered 3 and 5 are the protection OTU boards. The boards numbered 4 and 6 are the working OTU boards.

Figure 1 Application of the DLAG (normal)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 1. At the transmitting end, client service a is transmitted over the working and protection channels after passing the TBE numbered 1. At the receiving end, the cross-connection of the OTU numbered 6 takes effect and the cross-connection of the OTU numbered 5 is disabled.

Figure 2 Application of the DLAG (switching)

: Direction of the working signal flow

: Direction of the protection signal flow

See Figure 2. When a fault occurs between the DLAG protection and R1, the DLAG protection switching occurs. At the transmitting end, client service a is transmitted over the working and protection channels after passing the TBE numbered 2. At the receiving end, the cross-connection of the OTU numbered 6 takes effect and the cross-connection of the OTU numbered 5 is disabled.