Regarding the test item of IEEE 1588V2 time protection function, which of the following statements is wrong?
A . On the OptiX OSN 8800, the active and standby states of the clock board and the cross board are related to each other. When performing a switch test, it is recommended to switch only the cross board or clock board.
B . On the OptiX OSN 6800, the active and standby states of the clock board and the cross board are related to each other. When performing a switch test, it is recommended to switch only the cross board or clock board.
C . Testing the long-term stability of time performance in PTP synchronization mode, the time performance of the output should be within ± 1us.
D . Long-term jitter test in physical layer synchronization mode, using a time analyzer with a GPS receiver to observe at the last node for more than 8 hours, the test output time performance should be within ± 1us.
Answer: B
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