Which of the following descriptions of the 1+1 protection features on the client side is wrong?

Which of the following descriptions of the 1+1 protection features on the client side is wrong?
A . OTU client optical layer dual transmission and selective reception
B . Protect the OTU board and OCh fiber by occupying two wavelengths for protection and using different routes for transmission
C . Working and protection wavelengths must be the same
D . Long application time and wide protection range

View Answer

Answer: C