User manual

Raisecom Technology Co., Ltd
17
6. Troubleshooting
If you have any problems during installation and using, try to solve them by the following
proposals. If there is no solution, please contact with distributors for technical support.
These following explanations and solutions of alarm for optical port and LOS alarm for E1
tributaries are analyses of local alarm. Please handle it at remote site if there is remote
alarm.
z Green PWR indicator not on
Answer: PS faults. Check if PS working properly and –48 PS connection is not reverse.
z GL is on
Answer: GL is on when alarm happen in local site (L row); GL is flashing when alarm
happen in remote site (R row).
Deal with them as following:
1． Besides GL there are some other alarm indicators red or yellow, please deal with
these alarm at first.
2． Except GL, no alarm happens in L row. But GL is still on in local site (L row). The
reason maybe is that CV alarm exists. It is arose by much longer E1 line or much
disturbance or attenuating more than -6dB.
3． Except GL, no alarm happens in R row. But GL is still on in remote site (R row). The
reason is that HDB3 CV alarm happened in remote site.
z LOS red indicator of optical port is on
Answer: Loss of receiving signal occurs at optical port. Check if the input fiber is connected
well and if there is reverse in connection. Check the received optical power using optical
power meter, it should be greater than receiving sensitivity.
z LOF red indicator of optical port is on
Answer: Loss of frame of receiving signal at optical port. In this case, optical signal has
received, but the optical power may be about critical value of sensitivity. Check RX optical
power to ensure if it connects well at remote optical TX port.
z E-3 red indicator is on at optical port
Answer: The bit error of optical RX signal is greater than 10
-3.
Check if optical RX port
connects well and RX optical power.
z E-6 yellow indicator of optical port is on
Answer: The bit error of optical RX signal is greater than 10
-6.
It is normal that there is E-6
alarm just after turning on the power, after about 10 seconds, the E-6 indicator will be off. If
there is E-6 alarm during operation, then check if optical RX port connects well and RX
optical power is normal.