Application of PRBS

Specific application scenarios are provided to meet different requirements of the PRBS test.

In the PRBS test, OTU boards are used as the meter board and the auxiliary board. There are two common networking modes for the PRBS test. In the first mode, the PRBS test is started on the client side of the OTU board. In the second mode, the PRBS test is started on the WDM side of the OTU board. The details on the two modes are provided as follows.

Starting the PRBS test on the client side
See Figure 1. One OTU board is used to serve as a meter. In this case, the OTU board is called meter board. The meter board generates PRBS signals and sends the signals to the client side of the local auxiliary board. The signals are looped back on the WDM or client side or with fiber of the auxiliary board at the opposite end.

Figure 1 Schematic diagram of the PRBS test on the client side
Starting the PRBS test on the WDM side
See Figure 2. One OTU board is used to serve as a meter. In this case, the OTU board is called meter board. The meter board generates PRBS signals and sends the signals to the WDM side of the auxiliary board at the opposite end. The signals are looped back on the WDM side of the auxiliary board at the opposite end.

Figure 2 Schematic diagram of the PRBS test on the WDM side