JK Audio PBXport - Manual (Page 7)

10
FAQs
? Will PBX Port work with my __________ PBX phone
system?
! Probably yes. We have to say probably because the
handset interface is proprietary and therefore can
change from model to model. We have no way of pre-
dicting how a phone manufacturer will use the handset
wires in the future. The three handset microphone types
that we support, electret, dynamic, and carbon, cover
every handset microphone type that we have seen in
use, but the wire diagrams can change without notice.
? Can PBX Port auto-answer or auto-disconnect?
! No, the handset cord on your telephone is only active
when the handset is off-hook. This is done manually.
There is no way then to auto-disconnect. You must re-
turn the handset to the cradle.
? Why can’t I dial out on my phone? or I hear a lot of
noise on the call?
! PBX Port will not work with any telephone that has a
keypad in the handset. You need to use a telephone
with a standard handset.
? I have everything connected correctly. Why can’t the
caller hear me?
! This could be one of two things. First, check the position
of the A-B-C switch. Most phones use either setting A or
C. If you cannot send any audio with setting A, you
should use setting C.
Also, you cannot use the speakerphone function on your
telephone during your recording. PBX Port accesses
the audio path through the handset cord. With the
speakerphone turned on, there is no audio going to the
handset.
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.