JK Audio PBXport User Manual
PBXport
Rackmount PBX
Digital Hybrid
User Guide
JK Audio
Introduction
PBXport will allow you to send and receive audio through your multiline PBX, ISDN or analog telephone. While this may seem like a simple task, the challenge is getting the best quality audio from such a
limited audio path.
What is a Digital Hybrid?
The PBXport digital hybrid connects audio signals to and from the
handset side of a telephone without the variations in quality found
with analog hybrids. The main function of a hybrid is to bring in the
caller’s voice from the phone line, as clear and clean as possible. In
the real world, when you send your voice down the telephone line it
has a tendency to bleed over into the caller’s audio. The hybrid must
adapt to the audio signals from the telephone in order to properly
separate transmit and receive audio. We use a 16 bit DSP (Digital
Signal Processor) to continuously monitor the audio signals from the
telephone to deliver excellent separation. Our dual-convergence
algorithm can achieve excellent trans-hybrid loss, also known as
"separation".
Ready to go?
The PBXport controls and connectors are clearly marked and ready
for operation. The feature diagram will help you pinpoint any minor
questions that you may have. If this is your first exposure to a hybrid,
we suggest that you read the entire manual to allow you to take advantage of all these features.
Any Questions?
Before you pick up the phone... Please thumb through the rest of this
manual. You might find those deep technical questions are covered
on later pages.
Safety Symbols used in this manual:
ATTENTION! - Alerts you to instructions for preventing a
situation that could result in damage to the unit.
WARNING! - Alerts you to instructions for preventing a poten-
tially hazardous situation that could result in bodily injury.
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Features—Front View
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1. Handset Button - Press this button to use the handset as on a normal
phone call.
2. ON LED - Lit when you are online with a call using the digital hybrid.
3. Online Button - Press this button to disable the handset and activate the
PBXport for use as a digital hybrid.
4. Send LEDs - Displays the signal level going out to the telephone line.
5. Send Level - Adjusts the signal level that you are sending down the telephone line, through the female XLR input.
6. Caller Level - Adjusts the level of the signal coming in from the telephone
line, going out the output jacks.
7. Send>Mix Level - Adjusts the level of local Send audio going out the Mix
output jack.
8. Mix<Caller Level - Adjusts the level of signal coming in from the telephone line, going out the Mix output jack.
9. Mix Monitor jack - 1/4" stereo headphone jack containing the same mix
as the Mix output jack.
10. Mix Monitor Level - Adjusts the signal level of the 1/4" headphone jack
and the speaker terminals.
11. Front Panel Handset Jack - Connect your telephone handset to this jack
or the rear panel handset jack.
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12. Front Panel Phone Jack - Connect the handset jack on your telephone
base to this jack or the rear panel phone jack using the supplied handset
jumper cable.
13. Power LED - Lit when the unit is plugged in and receiving power.
14. Receive LEDs - Displays the signal level coming from the phone line,
after the DSP.
15. Handset Type Selector Switch - Use this switch to select the correct type
of handset microphone that your telephone uses. A=Electret, B=Carbon,
C=Dynamic.
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Features—Rear View
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16. Caller Output - Male balanced XLR output contains caller audio from the far side of the call.
17. Mix Output - Male balanced XLR output contains Caller and/or
Send audio based upon Send>Mix<Caller volume control settings.
18. Send Input - Female balanced XLR input for signals going into
the phone line. Mic or line level input. This jack does not provide phantom power.
19. Mic / Line switch - Sets the front end sensitivity of the Send
XLR input. Set to Mic if you intend to plug a microphone directly to the Send jack. Set to Line if you are connecting to the
line output or auxiliary output of a mixer or other audio equipment.
20. Rear Panel Phone Jack - Connect the handset jack on your
telephone base to this jack or the front panel phone jack using
the supplied handset jumper cable.
21. Rear Panel Handset Jack - Connect your teleph one handset to
this jack or the front panel handset jack.
22. Screw Terminal Block - For speaker connection, remote LED
status connection and remote Online / Handset control.
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Connection—Mix-Minus Setup
Aux Send to Send 1,
Caller to any
line level input
Number of mics
depends on mixer
Mic/Line button in (Line)
Use Main Outputs,
USB or Firewire
connectors to
send audio to
recording device,
or broadcasting
equipment inputs
For whichever input channel you have the Caller connected to, turn the
corresponding Aux control to minimum (usually hard left). All other Aux
controls should be set for what you want to send to the phone line. Each
Aux Send bus is completely separate from all other outputs, so these Aux
controls will not affect what is heard on the Main outputs or on any other
Aux buses. This Aux Send bus should be pre-fader, so you can use the
fader controls to set the levels of each channel to the main output.
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