1. Generally in NG WD systems, the full-wave incoming fiber optical power generally does not exceed 20dBm. Which is the main reason?

2. Which of the following are the logical ports on the client side of the board in the standard mode?

3. When creating a single-station optical crossover, an error message appears "The direction of the fiber and cable is incorrectly selected". Which are the possible reasons?

4. The following description of Flexible ROADM, which is wrong?

5. The following description about using the synchronization method to create optical fibers, which is wrong?

6. When using the path method to create OCh, which of the following service layer paths is necessary?

7. The length range of the DATA field in the Ethernet frame structure is?

8. When the main control board is configured with a single board, which step is required to replace the single board than when the main control board is configured with a dual configuration?

9. Which of the following statements about the MPLS-TP OAM level is correct?

10. The following description of the internal port attributes of the Ethernet board, which is wrong?

11. MPLS APS is a network protection mechanism, which realizes service switching through the detection function of MPLS OAM.

12. Which of the following SOM systems cannot be monitored?

13. For emergency treatment of business interruption, fault location should be carried out as soon as possible, and then the business should be restored.

14. When a signal with a standard Ethernet frame length of 64 Bytes is connected to the Ethernet board, if the QinQ function is enabled, what is the actual frame length of the signal inside the board?

15. You need to perform () operation before querying the error code and optical power on the network management system, otherwise the corresponding teaching data cannot be queried.

16. The setting of alarm reversal is based on?

17. In the characteristic test of the splitter (combiner), what standard is required for the isolation test?

18. When performing a 10-minute error-free test on a certain wavelength division channel, the local end uses an SDH analyzer to interconnect with the client-side interface of the OTU board, the OTU client interface at the opposite end needs to perform fiber self-looping, and solid attenuation must be added during self-looping.

19. The maximum output optical power of an optical amplifier OBU is 20 dBm, and when it is used in the C-band 80 passive system, how much dBm should the single-wave standard output optical power be?

20. When the input optical power of the OAU amplifier at the receiving end is lower than the nominal optical power, the following operations which is wrong?

21. Since the CWDM system does not use optical amplifiers, the focus of commissioning is whether the light reception of the OTU board is reasonable.

22. By default, the network element automatically backs up the network element database to the FLASH library every 30 minutes.

23. When using the path method to create a client path, if there is an RLOS alarm on the line board, the path cannot be created.

24. The transmission plane mainly completes the functions of optical signal transmission, multiplexing, configuration protection switching, and switching connection. And ensure the reliability of the transmitted optical signal. But the exchange action of this layer is carried out under the action of the management plane and the control plane.

25. For ODUk SNCP protection, if the pass-through site is an electrical relay station, it is recommended to configure the SNCP type as SNC/I when configuring the protection.