If a bit error is detected in the B1 byte, which of the following alarms will be reported by the peer end?

Which of the following descriptions about the composition of the SOM system is wrong?

Which of the following boards contains VOA modules? (Multiple choice)

When adjusting the optical power, the flatness is a very important index. The adjustment of the flatness is generally completed through the single-channel VOA in the multiplexer board. For example, when the flatness is adjusted through the M4OV, the M40V board can detect For the input optical power of all multiplexing ports, the project can set different VOAs according to different input power values to achieve the purpose of flatness commissioning.

MPLS technology can be nested in multiple layers. There is no limit. It is only limited by (). It has good scalability.
Which of the following is correct?