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SX-200 ICP MX Technician’s Handbook
Table 59: Audio Quality Problems Troubleshooting
Symptoms Probable Cause Corrective Action
Excessive noise Faulty cabling Check for cabling problems.
One way audio
between Remote IP to
TDM (VM)
No gateway IP address
programmed in the
controller.
Make sure that the gateway IP
address is programmed properly.
Distorted audio only
on NSU
Voice encoding is not
inverted.
1. For T1, enable invert for Voice
encoding in link descriptor.
2. For CEPT or API, enable ADI
invert for voice encoding. (This
does not apply to Embedded PRI.)
Echo Echo between LS trunks
and IP phones.
Measure the loss level and
impedance for LS trunks connected
to onboard ASUs (See “Diagnostic
Function Commands” on page 231).
If necessary, update the Options
subform of Form 13 with matching
settings.
Handsfree mode is used. Check if far end is using handsfree.
Switch to Handset mode to see if this
corrects it, or lower the handsfree’s
volume.
Echo Canceller is
beyond specifications.
1. Identify the path between the two
end points, and verify if Trunk is
always involved.
2. Check with Telco to see if the trunk
is within specs. On a typical T1,
the input signal should be -15 dB.
If it is too high (-5 dB for example),
echo may result.
3. If this is the case, keep an echo log
to isolate the problem.
Network jitter issue. If the problem only occurs between
IP devices, check network jitter issue
below.
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