Matrix NAVAN CNX200, Системное руководство

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478 Matrix NAVAN CNX200 System Manual
CO port of NAVAN to the line) and CO Termination (Impedance presented by the Central Office to the line),
and to some extent by the transmit and receive signal path.
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 NAVAN to the Central Office.
In the CO Termination list, select the appropriate line impedance match. This would depend on the region
where NAVAN 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 the CO Trunk port on
which you will apply this setting. 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.
7.
CO Line Type: This parameter 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 NAVAN 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.
8.
Gain Setting: 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
(Voice Module messages). 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.