Product specifications

Appendix
101
No. Symptom Probable Cause Corrective Actions
6. Device can not be
managed
￭Networking service management
SNMP may be off
￭Device IP incorrect
￭SNMP agent configuration :
read/write community incorrect
￭Check networking service
management
￭Check device IP
￭Check SNMP agent configuration
7. Power indicator is off Power supply is not available;
The mains switch of the power
supply is not closed;
The connection of the power supply
is not tight;
Change the power supply;
Close the switch of the power supply;
Screw down the power supply
8. Optical LOS alarm
indicator is on
If self loop of the optical ports is
normal and the connection of the
optical cables is right, the optical
cables has trouble or the distance is
too long;
Otherwise the TX and RX optical
interface connection may be
reversed;
Change the optical cables;
Change a long distance optical
module;
Exchange the TX and RX fiber
cables
9. The equipment at one
side of the optical
connection is normal,
and other has LOS
alarm
Self loop separately, the equipment
that has LOS alarm has trouble
Otherwise the RX fiber cable has
trouble
Contact with your support
representative
Change the optical cables
10. E1 interface alarms Coaxial connector has trouble
The E1 equipment is powered off
The E1 TX and RX interface
connection is reverse;
The alarm of tributary E1 is not
masked
Adjust the coaxial connector
Power on the E1 equipment that
connects to the unit;
Exchange the TX and RX interface
connectors;
Press the "MASK" button to mask the
tributary E1 alarm;
11. V.35 interface alarms Clock settings do not match
The V.35 connector has a bad
contact
Check V.35 interface configured
12. OE module cannot
switch
Check OE module setting for startup
lock function.
Check Optical interface parameters
under config
Check OE switching protection status
13. PRBS test shows error
bits or test is ok but
always showing red
indicators.
Not comply use framing in unframed
type module.
The user lookup PRBS test result in
the wrong location
Configured correct type in unframed.
In general, user should check the
results in PRBS testing screen.
14 LCD key cannot login
and set
Check that input key priority button is
correct.
Check console screen item "LCD
Login Configuration" whether it has
defined.
Check "LCD Login Configuration".
15 E1 interfaces have bit
errors Impedance is not matched or E1
cables are too long. The E1
connector has a bad contact, 120Ω
connect cable is not twisted;E1
terminal unit is not common earthed
with the optical multiplexer
Confirm the impedance of the E1
equipment is same of the optical
multiplexer;
Confirm the distance of the E1 cable
is no longer than 200 meters;
Adjust the E1 connector
Confirm the 1,2 pin of the RJ-
45(120Ω) is twisted, and the 4,5 pin
is another twist;
Confirm the earth ground of the E1
terminal unit and the optical
multiplexer is according to the
electrician standard;