When different routes are used for client-side 1 + 1 protection, the working wavelength and protection wavelength cannot use the same wavelength.

• A.True
• B.False

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For the MSTP equipment, the pass-through mode is used for VC-4 services by default, and the termination mode is used for VC12/VC3 services by default.

• A.True
• B.False

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In the case of the OptiX OSN equipment, when the standby board is normal, which of the following operations does not cause the active/standby switching of the cross-connect board or clock board?

• A.Delete the active cross-connect board or clock board logically.
• B.Deliver the active/standby switchover command.
• C.Perform a cold reset on the cross-connect or clock board.
• D.Open the upper and lower ejector levers of the active board at the same time.

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Which of the following protection schemes require the APS protocol?

• A.ODUk SPRing protection
• B.SW SNCP
• C.ODUk SNCP
• D.1:1 optical line protection

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A, C are the WDM OTM stations, and B is the relay station. When the transmission direction of the A to B stations is interrupted, the Wavelength side of the B-stack OTU relay board reports the R_LOS emergency alarm and runs the processing to the upstream A.
The station side OTU2_BDI secondary alarm. At the same time, the alarm continues to be transmitted to the downstream station of the B station. After the alarm is processed at the C site, the ODU2_PM_AIS minor alarm is reported on the WDM side of the C-site OTU, and the ODU2_PM_BDI secondary alarm is transmitted back to the upstream station A.

• A.TRUE
• B.FALSE

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