V.35 Fiber Modem Installation and Operation Manual
Page 13 of 13
6. Common Problems
Common Failures and Solutions
No
.
Failure
Cause
Solution
1
PWR
power
supply
indicator
lamp not
lightening
1.Power supply not properly
connected
2.Protector tube damaged
3. -48V DC input tie-line in
reverse connection
4.Internal
power
supply
circuit with failure
1.Check power switch and jack
2.Replace
protector
tube
3.Correct -48V power supply line
connection
4.Returned to the manufacturer
for repair.
2
LOF
out-of-fra
me alarm
lamp
lightening
1.Optic interface not clean
2.Optic fiber not well inserted
3.Wrong clock setting
4.Time slots of the devices at
two ends not conformance
5.Internal circuit damaged
1. Clean the connector of optic
interface
2. Insert the SC connector in
place
3. Refer to the description on rear
panel
4. Returned to the manufacturer
for repair.
3
LOS data
loss
alarm
lamp
lightening
1. Optic fiber in wrong
interconnection
2.Optic fiber not well inserted
3.Optic fiber broken
4.Internal circuit damaged
1. Correct the connection
2. Insert the SC connector in
place
3. Check optic cable
4. Returned to the manufacturer
for repair.
4
TXD
lamp not
lightening
V.35
interface
not
well
connected or the router etc.
not turned on.
1. Check the connecting line and
terminal device