User manual

Raisecom Technology Co., Ltd
10
in the fiber cable.
5.3.3. Applying the Power Supply
When PS is turned on, the PWR indicator shall be on.
After applying the power supply, first please ensure there is no alarm at the optical port. If
the optical port is connected properly, there shall not be LOS alarm. When just applying the
power supply, the ERR (yellow) indicator shall be on. This is because of the few error bits
generated by the jitters. It shall be out after 10 – 20 seconds. The ERR indicator includes 3
kinds of alarms, Loss of Frame, BER exceeding 10
-3
, and BER exceeding 10
-6
. Please refer
to network management software for details.
5.3.4. Mask/No Mask Button
If the connected E1 links are working in good condition without any signal loss, while there
is still another unused E1 link, the LOS alarm for unused E1 link may occur, which is called
“unused E1 alarm”. Press MASK/NO MASK button “on” to clear all the unused E1 alarm
and all the E1 LOS alarm indicators will be off.
In the case unused E1 link alarm being masked, if the connected E1 sub-channel is
disconnected, the LOS indicator of this sub-channel will still be on.
If power supply is cut off and turned on again, then the mask function will be disabled.
Press button to “off” and then pressed to “on” again.
If after a period of operation, a new E1channel is needed, first disable the mask function
and then connect E1 link.
Chapter 4 Troubleshooting
If there are any problems during installation and using, try the following proposals. If the
problems still can not be solved, please contact distributors/agents 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.
z PWR (green) indicator not on
Answer: PS faults or PWR indicator is not functioning. Check the power supply of
RC004-16.
z LOS (red) indicator of optical port is 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.
z ERR (yellow) indicator of optical interface is on
Answer: When just connecting the fiber-optic cable, the ERR (yellow) indicator shall be on.
This is because of the few error bits generated by the jitters. It shall be out after 10 – 20
seconds. The ERR indicator includes 3 kinds of alarms, Loss of Frame, BER exceeding
10
-3
, and BER exceeding 10
-6
. Please refer to network management software for details.
z LOS (red) indicator of E1 sub-channel is 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 75Ω cables are reversely connected, or
whether the wires of 120Ω cables are in correct sequence. If LOS alarm occurs at unused