In a chain network, NE1, NE2, and NE3 are all OADM sites, and NE1 is a gateway network element, and uses OSC communication. When the optical monitoring board at the intermediate site NE2 fails, which of the following phenomena will not occur?

In a chain network, NE1, NE2, and NE3 are all OADM sites, and NE1 is a gateway network element, and uses OSC communication. When the optical monitoring board at the intermediate site NE2 fails, which of the following phenomena will not occur?
A . The optical monitoring signal between NE1 and NE3 is interrupted
B. The monitoring board in NE2 reports the BD_STAIUS alarm
C. The OSC_LOS alarm is reported on the monitoring boards in NE1 and NE3
D. Service interruption between NE1 and NE3

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Answer: D