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 Fault Description
Network topology: Telephone -> ONU (MA5616) -> OLT (MA5600T) -> Softswitch
Fault description: In an office, the voice subscriber of the MA5616 hears much noise after offhook. Alarm Information
There is no alarm information, but the alarm LEDs on the ASPB boards in slots 1 and 2 are on continuously. Cause Analysis
-The subscriber loop line is faulty.
-The ASPB board is faulty.
-The ASDA narrowband daughter board is faulty. Procedure
1.Connect a telephone to the MDF for test. It is found that the fault persists. This indicates that the subscriber loop line is normal.
2.Replace the ASPB board. It is found that the subscriber still hears the noise. This indicates that the ASPB board is normal.
3.Replace the ASDA narrowband daughter board. It is found that the fault is rectified and the subscriber makes a call normally. Suggestion and Summary
Generally, if the subscriber hears the noise after offhook, locate the fault from the DSP first. The DSP of the MA561x is integrated on the ASDA daughter board. Thus, when such a fault occurs, replace the faulty board with a normal one to rectify the fault. | 
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