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If there are any problems during installation and using, try the following proposals. If the problems
can still not be solved, please contact distributors or hot-line technical support for help.
The following explanations and solutions for alarms at optical ports and LOS alarms at E1 ports are
used to handling local alarm problems. For remote-end alarms, please handle them at remote site.
Green PWR indicator not on
Answer: PS faults. Check whether PS is working properly and –48 PS connection is not reversed.
LOS red indicator of optical port on
Answer: Loss of receiving signal occurs at optical port. Check whether the input fiber (RX) is
connected well and ensure not reversed. Or check the receiving optical power with optical power
test-meter, it should be greater than receiving sensitivity specification.
Optical interface ERR on
Answer: It is normal that ERR alarm occurs for 10 seconds just after turning on the power, after 10
seconds the ERR indicator will be off. If ERR alarm occurs during operation, check whether optical
RX port connects well and RX optical power.
LOS red indicator of E1 sub-channel on
Answer: Loss alarm of RX signal at E1 sub-channel, no HDB3 signal is received. Check whether all
E1 ports are connected well, or whether 75 ¦ ¸
of 75 ¦ ¸
cable are in right order. If LOS alarm occurs at unused E1 sub-channel, press "mask"
button to "on" to musk the alarm after finishing the configuration of device.
Mask button is on, but there is still alarm in unused E1 sub-channel.
Answer: probably the mask function is disabled if power supply is cut off and then turned on. To
solve is by pressing the mask button to "OFF", and then pressing to "on" to enable mask function.
How to take cable off from connector
Answer: push the part that is the biggest diameter of connector; don't twist. Then pull off.
Chapter 4 Troubleshooting
cable are reversely connected, or whether the wires
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