Which of the following descriptions about network protection switching test is wrong?
A.
Before testing, you need to set the 1:1 linear multiplex section protection mode to single-ended switching.
B.
During the protection switching of the linear multiplex section, the NE reports the APS_INDI and MS_APS_INDI_EX alarms
C.
SNCP protection is configured. When the laser of the interface connected to the opposite end is turned off, observe the SDH analyzer of the local end.
D.
There are two methods for testing the protection switching of the multiplex section: the single-ended loopback test method and the double-ended hanging meter
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