Raisecom Technology Co., Ltd
17
6 Troubleshooting
If you have any problems in installation and application, please try to solve it according to
following suggestions. If it still can not be settled please contact technical staff for support.
1
．
Power indicator (PWR
）
OFF
There is something wrong with power supply.
2
．
RLK OFF
There is something wrong with Ethernet receiving link, please check if fiber is cut off or
optical interface of the other end is in 100M full-duplex mode.
3
．
TLK OFF but RLK ON
There is something wrong with Ethernet transmission link, please check whether fiber is
cut off or optical interface of the other end is in 100M full-duplex mode.
4
．
LAL ON
If device works in transparent mode, LAL indicator means signal loss or up-stream AIS
alarm.
If device work in fractional mode, LAL means one of the following alarms: LOS (loss of
signal), LOF (loss of frame), AIS (up-stream alarm indication signal), and CRC (cyclic
redundancy check).
LOS means E1 interface can not receive signals.
Please check if the input E1 link is connected correctly, check the pin serial number if 120
ohm twisted-pair is used
Please check if the devices connected to E1 interface of converter are powered on.
Please check if E1 input link disconnects with bit error rate tester.
AIS means there is full 1s alarm of up-stream alarm.
Please check whether the devices in up-stream E1 link are powered on.
Please check if the impedance switch is set correctly, check the pin serial number if 120
ohm twisted-pair and if the connector becomes flexible.
Please check if output link disconnects with bit error rate tester and whether bit error rate