1. In order to quickly locate and promptly eliminate the failure of optical network equipment, maintenance personnel expertly master the basic operation of commonly used instrumentation, what of the following instruments are commonly used by optical network equipment in the maintenance? (Multiple Choice)

2. MSP switching results in service interruption Fault, the processing steps are:

1. Check the whole network APS protocol enable status. If some NE can't enable APs, then enable the protocol first.
2. If the status is abnormal, you can try to restart APS protocol again and re-issue the parameters of the multiplex section. After the whole network protocol is started, it will query the switching status and the whole network alarm.
3. Analyze the path of the faulty channel after the switchover, and then loop back to the next hop. According to the idea of "single station first, then single board", locate the fault to the single station and then to board.
4. After confirming that the whole network switching state is normal, the basically you can judge the device fails.
5. If all the network element protocols are enabled, then query all network element switching status, there are switching state, normal state, through state.

Which of the following is the correct order?

3. SDH NEs track the clock source, which of the following options can be the clock sources? (Multiple choice)

4.

About electrical safety, which of the following description is correct? (Multiple choice)

5. When replacing the PIU power supply board, when the device configure power supply 1+1 protection, you can directly replace the PIU board when the power switch of the DC power distribution box is not closed.

6. Which of the following description about the ASON-related protocol function? (Multiple choice)

7. NG-SDH system equipment supports both -48V and -60V power input. For OSN 3500 device, the input voltage range can be monitored by setting the power supply jumper for N3GSCC board. If the voltage supplied by the power supply is -48V, then should remove J30 and J31 jumper caps.

8. In daily maintenance, NE hosting is a very common type of failure.

The following descriptions about the ECC route, which are correct? (Multiple choice)

9. In the system commissioning, self-healing protection switching test is needed, which of the following description is wrong about the self-healing protection?

10. Which of the following is the path level supported by the NG-SDH device? (Multiple choice)