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System Configuration ~ Telco Transmit and Receive

 

Telco Receive

 

To open the Telco Receive configuration window, click the Telco Receive button on the

 

Flow Screen. The R button on the Matrix Screen will also open this window.

 

Mute

 

Mute mutes the audio being received from the phone line. The light on the button

 

illuminates red when Mute is activated. Default is off (unmuted).

 

ALC

 

Automatic level control (ALC) may be selected on the telco input. This feature is

 

designed to keep soft and loud telephone participants at a consistent level. The

 

parameters of ALC are adjustable. ALC can be turned on or off. Default is on. The

 

green button light illuminates when ALC is enabled.

Figure 3.62. Telco Receive window

NC

 

NC opens the Noise Canceller window. The noise canceller reduces ambient noise in

 

the signal for the telephone line only with no noticeable degradation in signal quality.

 

To use noise cancellation, click Enable Noise Canceller, then adjust the

 

Cancellation Depth to the setting which provides the best combination of low noise

 

and maximum speech clarity. The attenuation depth can be set in 1dB increments

 

from 6dB to 15dB. Default is 6dB.

Figure 3.63. Noise Canceller window

The noise canceller default is Off. When noise cancellation is enabled, the

green NC button light illuminates.

 

 

Gain

 

Gain allows you to adjust the input gain (range -65dB to 20dB, default 0dB) for the

 

Telco input. Place a signal on the input at the maximum level it will generate. Adjust

 

the input gain until the peak level of the input, as shown in the Post Gain meter, just

 

begins to enter the red (clipping) zone, then reduce the gain slightly until peaks no

 

longer climb into the red zone. This setting will ensure that the XAP400 maximizes

 

the signal-to-noise ratio without clipping the signal.

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760

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ClearOne comm XAP 400 Telco Receive, Green button light illuminates when ALC is enabled, From 6dB to 15dB. Default is 6dB