www.raisecom.com User Manual
15
Appendix A 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 Optical interface indicator ALM red ON.
Local optical interface Rx alarm
Please check whether the fiber is well connected to the Rx of the optical interface and
whether the Tx and Rx of the optical interface have been incorrectly connected.
Users can use optical power meter to measure the optical power of the receiving signal. The
optical power of the receiving signal should exceed the receiving sensibility of the optical
interface and it should not be around the critical value of the receiving sensibility.
¾ Optical interface indicator ALM red flickering.
Remote optical interface Rx alarm
Please check whether the fiber is well connected to the Rx of the remote optical interface and
whether the Tx and Rx of the remote optical interface have been incorrectly connected.
Users can use optical power meter to measure the receiving optical power of the remote
optical interface. The optical power of the receiving signal should exceed the receiving
sensibility of the remote optical interface and it should not be around the critical value of the
receiving sensibility.
¾ The E1 interface LOS (red) indicator turns ON.
E1 loss of receiving signal alarm
No HDB3 input
Please check whether the E1 interface is well connected and whether the pin arrangement of
the connector of the 120Ω E1 cable is correct.
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