Which of the following monitoring boards do not support the processing and transparent transmission of 1588V2 signals? (Multiple choice)

The E&M signal defines the type of connection between a relay device and a signaling unit. Which of the following belongs to the relay device?

When the optical cable between the FIU and the FIU fails, the optical layer alarm reported by the downlink site is (). (Multiple Choice)

Which of the following description of the PM_BIP8 related alarm is correct?

When many alarms are reported at the same time, the alarm handling priority is as follows: Handle alarms according to the priorities of equipment alarms (such as BUS_ERR, HARD_ERR, and COMM_FAIL), optical-layer LOS, electrical-layer OTUk_LOF, ODUk_SSF, and protection switching.