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The ring network of the OSN6800 equipment group was newly opened, and ODU1-SNCP/N protection was enabled. The engineer reported that a switch occurred one day and has not been restored, but there is no problem with the optical cable. There is an ODU_SNCP_PS alarm on the corresponding ND2 optical port. The possible reasons are:

• A. The PM overhead of the related circuit board is set to "LCK Insert" as enable
• B. The business configuration is wrong, or there is redundant business crossing at the business source and sink;
• C. There is a minor alarm ODU1_PM_LCK on the relevant circuit board;
• D. Related circuit board failure;

In the ASON network, when a root optical fiber contains part of the multiplex section, the working time slot of the multiplex section constitutes (); the protection time slot of the multiplex section constitutes (), and the time slots unrelated to the multiplex section constitute (). If resources are reserved for the time slot (for static service use), this part of the time slot is divided into ().
Please select the answer that meets the requirements from the options below in order.

• A. working link, protection link, unprotected link, protection link
• B. working link, protection link, unprotected link, unprotected link
• C. Protected link, working link, unprotected link, unprotected link
• D. working link, protected link, unprotected link, static service dedicated link

In the test item of IEEE 1588V2 time protection function, what is wrong?

• A. To test the long-term stability of the time performance in the PTP synchronization mode, the output time performance should be within ±1us.
• B. On the OptiX OSN 8800, the active/standby status of the clock board and cross-connect board are related to each other. During the switching test, it is recommended to switch only the cross-connect board or clock board.
• C. On the OptiX OSN 6800, the active/standby status of the clock board and cross-connect board are related to each other. During the switching test, it is recommended to switch only the cross-connect board or clock board.
• D. Long-term jitter test in physical layer synchronization mode, using a time analyzer with GPS receiver to observe at the end node for more than 8 hours, and the test output time performance should be within ±1us.

Regarding the OTN system network-level protection switching test, is the following statement wrong? ()

• A. By default, the power difference between the main and backup channels of the OLP protection group exceeds 3dB and reports an alarm, and the maximum can be set to 8dB;
• B. OLP master and backup optical power abnormal threshold exceeds 5dB by default to perform switching, and the threshold range can be set from -5 to 5
• C. ODUk-SNCP does not involve a switching protocol, so it can assure customers that the test switching time must be less than 50ms
• D. ODUk-SNCP protection is superimposed on OLP protection. In order to avoid secondary switching of SNCP protection, the delay time can be set in the SNCP protection group
• E. In the OTN bearer SDH multiplex section ring networking scenario, in order to avoid simultaneous switching of OLP protection and MSP protection, the delay time can be set in the MSP protection group

Error code is a common phenomenon in equipment maintenance. Which of the following phenomena may cause error code? (multiple choice)

• A. The device temperature is higher than normal
• B. The device is not grounded
• C. The optical power of the optical port exceeds the overload point or is lower than the sensitivity
• D. A large number of pointer adjustments have occurred on the device