Troubleshooting - Raisecom RC802-60B Series User Manual

If there is any problem during installation and operation, please try the following solutions. If
the problems still cannot be solved, please contact distributors for technical support.
The following explanations and solutions for optical port alarms and E1 LOS alarms are
used to handle local alarm problems. For remote-end alarms, please handle them at the
remote site.
Green PWR indicator is not on
Answer: Power supply fails. Check whether the power supply is working properly, and
make sure the power cable for –48V DC is not reversely connected.
Red LOS indicator of optical port is on
Answer: Loss of receive signals occurs at the optical port. Please check whether the input
fiber (RX) is connected properly and ensure it is not reversely connected. And check the
receiving optical power with optical power test-meter, which shall be bigger than the index
of receiving sensitivity.
Yellow ERR indicator of optical port is on
Answer: The loss of frame alignment occurs, or the bit error rate of optical RX signal is
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greater than 10 or 10
but after 10 seconds the ERR indicator shall be off. However, if ERR alarm occurs during
operation, please check whether optical RX port connects properly, and test the RX optical
power.
Red LOS indicator of E1 sub-channel is on
Answer: If loss of RX signal alarm in E1 sub-channel occurs, no HDB3 code signal will be
received. Please check whether all E1 ports are connected properly, and whether 75Ω
cable is reversely connected, or whether the wire sequence of 120Ω cable is in right order.
If LOS alarm occurs in the unused E1 sub-channel, press "mask" button to "on" to mask the
alarm after finishing the configuration of device.

6. Troubleshooting

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. Usually ERR alarm occurs right after applying the power supply,
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Raisecom Technology Co., Ltd