8 Fault
Treatment
Before leaving factory, the equipment has been adjusted to optimal status, and all the functional
interfaces are all in the front and rear panel. Except our technicians, no one shall open the unit shell
freely. When the equipment has fault, use the stand-alone self-loop-back function to decide the fault
scope and contact us immediately.
The table below lists the common faults and alarms, the possible causes for alarms and solution, only
for reference.
Equipment Alarms and Corresponding Treatment
No
Alarm
Possible
Causes
Treatment
1
Primary
Alarm
POWER is
on.
Cannot supply
power.
The power supply is not connected well. The
polarities are reversed.
2
Red LOS
light is on.
Cannot
receive optical
signal.
The optical fiber link is not through. There is on
optical light from the opposite end.
3
Red LOF
light is on.
Cannot
receive
normal frame
signal.
The receiving is not stable. Check the optical link
and equipment.
5
Secondary
Alarm
Red RAD
light is on.
The opposite
end alarms.
Check the opposite end.
6
CH# alarm
Cannot
receive 2M
signals.
Check the quality of fiber cable. The TX and RX
fibers are connected in reverse or not.
7
Sound
alarm
The local end
alarms.
You may screen the equipment when handling
fault.
