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

When the optical cable between the FIU and the FIU fails, the optical layer alarm reported by the downlink site is (). (Multiple Choice)
A . OSC_RDI
B . R_LOS
C . MUT_LOS
D . OSC_LOS

View Answer

Answer: BCD