When the main fiber is broken or the OLT cannot detect the expected optical signal (LOS) alarm, the possible reason is? (Multiple choice)

When the main fiber is broken or the OLT cannot detect the expected optical signal (LOS) alarm, the possible reason is? (Multiple choice)
A . There is a rogue ONU under the port
B. Port trunk fiber failure
C. All power failures or faults under the port
D. Port laser is turned off

View Answer

Answer: BCD