Application of Board-level Protection

The application of the general-mode board-level is similar with that of the extended-mode board-level, whereas the latter requires the SCS board. The following text considers the general mode as an example to describe the board-level application.

Figure 1 indicates that the project is a point-to-point network that consists of stations A and B. Stations A and B are OTM stations and are configured with the board-level protection. Each station is configured with two TBE boards. By default, TBE1 serves as the active board and TBE2 serves as the standby board.

Figure 1 The board-level Protection Application (Normal)

: Direction of the working signal flow

: Direction of the protection signal flow

As shown in Figure 1, normally, the cross-connections of TBE1 in station A are enabled. TBE1 receives client services and send them to station B. The services of only TBE1 in station B can travel to the client equipment.

Figure 2 The board-level Protection Application (Switching)

: Direction of the working signal flow

: Direction of the protection signal flow

Figure 2 indicates that when TBE1 in station A is faulty, the board-level occurs in only station A whereas station B is not affected.

In station A, all cross-connections and services of TBE1 are switched to TBE2. After switching, TBE2 receives services of Client b and sends them to station B. Station B is not affected; the services of only TBE1 in station B can travel to the client equipment.