Specifications

164 IBM Voice Over Frame Relay Perform Guide
The Tx gains at both the local and remote units are usually left at the -4 dB
(factory default) setting to ensure that the amplifiers will not be overdriven
because too high an input signal is received from the associated telephony
equipment.
When adjusting these gains, issue a
SHOW CONFIG VOICE_ PORTS command to
display the current setting of the transmit and receive attenuations; use these
settings as starting points. All adjustments can be made from one IBM 9783 unit
but someone at the remote location must monitor volume and voice quality there.
This procedure assumes that adjustments are being made from the local IBM
9783 unit.
5.2.3.2 Adjusting Voice Gains
Make telephone calls to several different locations over the first voice channel to
be adjusted and adjust the transmit gain and receive gain of each unit to the
applicable levels. Repeat for each voice channel to be adjusted.
5.2.3.3 Tuning Analog Voice Levels
If you do make adjustments to Tx and Rx levels, you should use actual voice
conversations, not a test tone. The Tx level adjustment is made to your voice
transmitted toward the remote side. The Rx level adjustment is made to the voice
signal you receive.
5.2.4 Guidelines for Correcting Voice Levels
PROBLEM: Voice quality is good, but volume is low.
Remedy: Adjust your local Rx level (in increments of 1.0 dB) by one dB. For
example, from the default setting of -4 dB, adjust the Rx level to -3 dB.
PROBLEM: Volume is good, but Tx from the remote side sounds narrow or weak
("tinny").
Remedy: Adjust the remote Tx level (in increments of 1.0 dB) from the default,
for example, from. -4 dB to -3 dB. Adjust your local Rx level (in increments of
1.0 dB), for example, from -4 dB to -5 dB. Continue this method until volume
and quality are satisfactorily balanced.
PROBLEM: Volume is good, but Tx from the remote side keeps cutting out.
Remedy: Adjust the remote Tx level (in increments of 1.0 dB) from the default,
for example, from -4 dB to -5 dB. Adjust your local Rx level (in increments of
1.0 dB), for example, from -4 dB to -3 dB. Continue this method until volume
and quality are satisfactorily balanced.
PROBLEM: Volume is good, but you hear your voice coming back as an echo.
Remedy: Adjust the remote Tx level from the default setting of -4 dB to -5 dB.
Increase your local Rx level to compensate for the volume loss. Continue to
lower the remote Tx level until the echo is gone and to raise your local Rx level
to compensate for the volume loss.
PROBLEM: Volume is too loud.
Remedy: Decrease the Rx level on the side with a volume that is too high.
PROBLEM: Volume is too loud on extension-to-extension calls, but not loud
enough when dialing 9 to call outside: