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

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

View Answer

Answer: C