If no bit error test is performed on a optical channel for 10 minutes, the local end uses the SDH analyzer to connect to the client-side port on the OTU board, the client-side port on the opposite OTU board need to be self-looped by a fiber. In the case of self-loop, a fixed attenuator must be added.

When the standard Ethernet frame whose length is 64 Bytes is accessed to the Ethernet board, if the QinQ function is enabled, what is the actual frame length of the signal in the board? ( )

Which of the following statements about replacing the SCC board is incorrect?

Which of the following is not a part of the ASON Control Protocol?

The ROADM site using WSMD9 board can support up to 9 dimensions. If it exceeds 9 dimensions, it can be implemented by cascading WSMD9 boards.