When a working PQ1 board is faulty, the device performs TPS protection switching. Which of the following statements about the switching process are correct? (Multiple Choice)
Answer(s): A,B,C,D
When synchronization is performed on the 1U2000, the NE data that is the same as that on the U2000 is not uploaded to the U2000, and the data that exists on the U2000 but not on the NE is deleted.
Answer(s): B
In an OSN 550, the CXL slot houses a functional board that integrates the system control and communication (SCC) unit, cross-connect unit, and clock unit. The functional board is available in multiple types depending on the functions and access capabilities provided by the OSN 550.
Answer(s): A
Which of the following alarms does not trigger the AU-AIS alarm?
Answer(s): C
Forced switching, fiber cut switching, manual switching, and exercise switching are in the descending order of priority.
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