Switching priority of WDM protection groups

Question:
WDM protection includes the following: optical line protection (OLP), client 1+1, intra-board 1+1, ODUk SNCP protection, tributary SNCP protection, and ODUk SPRing protection.
There are five types of conditions for triggering protection switching. The switching operations in a descending order of priorities are as follows:
Clear switching, locked switching, forced switching, automatic switching, and manual switching.
A customer has following questions:
1. A clear switching command has the highest priority. Can it clear SF switching (automatic switching)?
2. What is the effect of a clear switching command when a revertive switching group is in WTR state?
3. What is the effect of a clear switching command when a protection group is in non-revertive switching state?
Root cause:
None
Answer:
1. A clear switching command has the highest priority over external switching commands, and is not issued upon automatic switching.
2. When the system is in the WTR state, a clear switching command can immediately terminate the WTR time to restore services to the working channel.
3. When a protection group is set to the non-revertive mode and both the working and protection channels in the group are normal, services are retained on their channel and are not switched to another channel after a clear switching command is issued.

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