1. The following description about the Raman amplifier commissioning and maintenance considerations, which is wrong?

2. Different manufacturers' SDH equipment, the same rate of the optical interface can not dock.

3. OSN1500, OSN3500, OSN7500 business card can be shared.

4. Which of the following statement is correct about XMC ODU separate mounting bracket?

5. Which is recommended to use for network planning and network protection?

6. ( ) is the information structure unit used to support the SDH channel layer connection.

7. PDH signal eventually multiplexed into SDH optical signal, subject to: ( ) three steps

8. The three core features of SDH are: synchronous multiplexing, powerful network management capabilities, and unified optical interfaces and multiplexing standards.

9. The current protection switching technologies that PTN defines include ( ) (multiple choice)

10. What is the advantage for MSTP mixed line card technology?

11. Which of the following statement is wrong?

12. Which program should be used so that the clock can solve the mobile bearer's time and phase synchronization needs?

13. What is the minimum access service particle size supported by the OSN 1800?

14. SDH signals need to be scrambled before being transmitted over the fiber. In the following bytes, which don't need to be scrambled?

15. What are the ways to achieve DCN feedthrough? (multiple choice)

16. In the following several working ways for Multiplex section, which priority is the highest?

17. Which type of clock has the highest accuracy?

18. Which of the following devices supports 360G high-order cross-connect capability?

19. The definition of OTN is Open transmission network.

20. When the SDH protection with 1: N protection way occurs; the protection channel's services will not lose.