Jk-audio PBXport User Manual download pdf (Page 7)

Operation (continued)

the Mix<Caller and Caller output on PBXport and connect

your handset back to the telephone. Any audio sent into the

Send input will still be active on the Mix output based upon

your settings.

Send Signal Level

The Send LEDs display the signal level as it goes out over

the phone line. The goal is to drive the phone line at high

enough levels to avoid phone line noise, but not so loud as to

cause excessive clipping. Adjust the send level control until

you see occasional flashes of the red -3dB peak Send LED.

These flashes should occur during loud speech bursts only. If

the red LED stays lit for extended periods you can assume

that much of your speech is being clipped or distorted. In this

case you should back down on the Send volume control or

the mixer output that is causing the clipping.

Receive Signal Level

The receive LEDs display the signal coming from the phone

line and out of the DSP. The Caller level control does not

change what you see on these LEDs. Adjust the Caller level

control to give you the best signal level at the output XLR. If

your telephone has an adjustable receiver volume control,

you should set this control to the "normal" position. If you at-

tempt to boost the level of the caller's voice using the handset

volume control on your telephone, you may cause PBXport to

become unstable. This instability would be caused by the in-

creased level of the transmit signal that becomes mixed with

the caller's voice.

Headphone Mix

The 1/4" headphone jack on the front of PBXport is used for

monitoring your call. This stereo jack contains a mix of both

sides of the conversation on each headphone channel. The

levels of this mix are determined by the Send>Mix<Caller vol-

ume controls. The overall audio level from this jack is deter-

mined by the Mix Monitor volume control.

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Jk-audio PBXport User Manual Page 7