284 Matrix ETERNITY NE System Manual
By correcting the line impedance mismatch, you can increase near-end echo cancellation. This is done by
selecting the AC Termination Impedance and CO Termination, and selecting a Line Type that most closely
models the line that connects the CO port of SARVAM UCS to the Central Office.
In the CO Termination list, select the appropriate line impedance match. This would depend on the region
where SARVAM UCS is deployed. For example, if AC Termination Impedance in your location is 600 and
the CO Termination impedance is 900 in series with 2.16µF, select 600 : 900 + 2.16µF. Default: None.
Now, select the line model to be used from the CO Line Type list.
You are recommended to conduct the AC Impedance Test for the line connected to each CO Trunk port.
The AC Impedance Test will help you determine the most appropriate values for the AC impedance, CO
Termination and the CO Line Type. For more information see the “AC Impedance Test” topic.
• CO Line Type allows you to select the Line model for the AC Impedance-CO Termination you selected.
You need to select a line type that most closely models the line connecting SARVAM UCS to the Central
Office. In the CO Line Type list, you may select a specific EIA line model from the eight options (EIA-0 to
EIA-7) or a specific wire gauge and length (2000 ft. 22/24/26awg). Default: None.
• Configure the following Transmit and Receive Gain Settings.
• CO - System (Tx-Gain and Rx-Gain): Configure the Gain Settings that you want the system to apply
on the CO port with respect to the system (for example Call Conference). These will not be applicable
for any other port type. Valid Range for Tx gain: +10dB to -15dB and Rx Gain +10dB to -15dB. Default:
-0.6dB for Tx Gain and -0.3dB for Rx Gain.
• CO - Voice Mail (Tx-Gain and Rx-Gain): Configure the Gain Setting that you want the system to apply
on the CO port when the incoming calls on the CO port are being answered by the VMS. Valid Range
for Tx gain: +10dB to -15dB and Rx Gain +10dB to -15dB. Default: -0.6dB for Tx Gain and -0.3dB for
Rx Gain.
• CO - Voice Module (Tx-Gain and Rx-Gain): Configure the Gain Settings that you want the system to
apply on the CO port when incoming calls are answered using Auto Attendant or Trunk Auto Answer.
Valid Range for Tx gain: +10dB to -15dB and Rx Gain +10dB to -15dB. Default: -0.6dB for Tx Gain and
-0.3dB for Rx Gain.
• CO - Call Progress Tones (Tx-Gain and Rx-Gain): Configure the Gain Setting that you want the
system to apply on the CO port while playing Call Progress Tones. Valid Range for Tx gain: +10dB to -
15dB and Rx Gain +10dB to -15dB. Default: -0.6dB for Tx Gain and -0.3dB for Rx Gain.
• CO - SLT (Tx-Gain and Rx-Gain): Configure the Gain Setting that you want the system to apply on the
CO Port when the CO Port is connected to any FXS Port of the system during an incoming or outgoing
call. Valid Range for Tx Gain: +10dB to -15dB and Rx Gain +10dB to -15dB. Default: -0.6dB for Tx Gain
and -0.3dB for Rx Gain.
• CO - CO (Tx-Gain and Rx-Gain): Configure the Gain setting that you want the system to apply on the
CO Port when the CO Port is connected to another CO Port of the system during an incoming or
outgoing call. Valid Range for Tx Gain: +10dB to -15dB and Rx Gain +10dB to -15dB. Default: -0.6dB
for Tx Gain and -0.3dB for Rx Gain.
• CO - SIP (Tx-Gain and Rx-Gain): Configure the Gain Setting that you want the system to apply on the
CO Port when the CO Port is connected to any SIP Trunk or SIP Extension of the system during an
incoming or outgoing call. Valid Range for Tx gain: +10dB to -15dB and Rx Gain +10dB to -15dB.
Default: -0.6dB for Tx Gain and -0.3dB for Rx Gain.
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