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Chapter 7 - Troubleshooting
Table 7-4. Voice/Fax Troubleshooting
Problem
Volume levels not sufficient on
local voice/fax channel
Local telephone goes off-hook
and remote telephone does not
ring (FXS to FXS configuration)
Data throughput slows
excessively when voice/fax
channel is active
FXO to FXO configuration -
local telephone does not ring
Parts of words are not being
heard
Possible Causes
Input level gain setting too low on
remote voice/fax channel
Output level attentuation setting
too high on local voice/fax channel
Device not connected to correct
voice/fax connector
Voice/fax channel configuration
problem
Too much bandwidth being used
up for voice/fax
Device not connected to correct
voice/fax connector
Voice/fax channel configuration
problem
Part of analog signal being clipped
off
Solution
1. Increase input level gain
setting on remote voice/fax
channel a couple db and
recheck voice quality (see
Table 7-11).
1. Decrease output level
attentuation setting on local
voice/fax channel a couple of
db and recheck voice quality
(see Table 7-11).
1. Verify that devices are
attached to voice/fax channel
FXS RJ-11 connector.
1. Verify that local and remote
interface types are configured
correctly (see Table 7-11).
2. Obsereve that the XSG LED
on the local voice/fax channel
lights when the telephone
goes off-hook and that the
RSG LED on the remote FXS-
configured voice/fax channel
flashes with each ring.
1. Decrease voice/fax channel
digitizing rate to 9600 bos
(see Table 7-11).
2. Enable or, if active, increase
silence suppression on voice/
fax channel (see Table 7-11)
1. Verify that the device is
attached to the correct voice/
fax channel RJ-11 connector.
1. Verify that local voice/fax
interface type is configured for
FXS and remote interface
type is set for FXO operation
(see Table 7-11).
1. Lower the input level gain and
the output level attentuation a
couple of db and recheck
voice quality (see Table 7-11).