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User Manual
20
Appendix B FAQ
For some problems you may meet during installation and operation, please try to solve them
following the suggestions below. For the problems can not be solved using the following suggestions,
please contact with distributors for technical support.
¾
The power supply indicator PWR (green) wouldn’t turn ON.
Please check whether the power supply cable of the device is well connected and whether the
power supply switch has been turned on.
¾
The optical interface LOS indicator (red) turns ON.
This indicates that loss of receiving signal (LOS) alarm occurs at the optical interface.
Firstly, please check whether the fiber is well connected to the optical interface.
Secondly, please form a self loop using the fiber (may need attenuation). If the alarm still
exists, please replace the fiber and again form a self loop using the new fiber. If the optical
interface LOS indicator is still ON, there is problem with the device.
¾
The optical interface LOF indicator (red) turns ON.
Loss of frame alarm of the receiving signal at the optical interface occurs. Optical signal has
been received, but the optical power may be around the critical receiving sensitivity. Please
measure the receiving optical power and make sure that the TX interface of the optical
interface of the remote device has been well connected.
¾
Optical interface indicator E-3 (red) turns ON.
The bit error rate of the receiving signal at the optical interface exceeds 1E-3. Please check
whether the optical interface has been well connected and please measure the receiving
optical power as well.
¾
Optical interface indicator E-6 (yellow) turns ON.
The bit error rate of the receiving signal at the optical interface exceeds 1E-6. The E-6 alarm
may occur when the device is just electrified. This is a normal phenomenon and will last at
most 10 seconds before the E-6 indicator turns OFF. If the E-6 alarm occurs during the
normal operation of the device, please check whether the optical interface is well connected
and please measure the optical power.