MODEL7302 User Manual
Page 10 of 10
to “OFF” (other switches are located in such a way that the setting of non-framing is
unaffected) Framing mode: 1st switch is set to “OFF”, and all other switches are set
according to the time slot positions to be used by E1 channel and the rate of V.35 port. (If
it is set to tracking remote time slot, the time slot switch will become invalid)
Attention: Ex-work S1,S2,S3 and S4 are all set to “OFF”
Attention: The setting of tracking remote time slot: S5.2 to “ON”; S5.1 and S5.3 to
“OFF”
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
Optic
interface
LOF
out-of-frame 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
Optic 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
Lightening
of
LOF
out-of-frame alarm lamp
at E1 interface
1.Error code in the line of
E1 interface
2.Internal circuit damaged
1.Check if UTP wire couple is twisted or
the connecting cable is not good contact
2.Returned to the manufacturer for repair.
5
Lightening of LOS data
loss alarm lamp at E1
interface
1.Line of E1 interface not
getting through
2.Internal circuit damaged
1. Check the linear sequence of UTP cable
or check if crystal head is in good
connection; Check if coaxial cable is
broken
2.Returned to the manufacturer for repair.
