JK Audio INNPBX User manual
innkeeper PBX
Desktop Digital Hybrid
User Guide
JK Audio
Introduction
Innkeeper PBX will allow you to send and receive audio
through your multi-line PBX, ISDN or analog telephone.
While this may seem like a simple task that any telephone
can do, the challenge is getting the best quality audio from
such a limited audio path.
What is a Digital Hybrid?
The innkeeper PBX 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 phone
line and local audio signals to deliver excellent trans-hybrid
loss, also known as separation. Our dual-convergence algorithm can achieve excellent separation, typically exceeding
50 dB.
Ready to go?
The innkeeper PBX controls and connectors are clearly
marked and ready for operation. The Features diagrams and
Operation sections on the following pages 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.
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Features
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1. Handset Button - Press this button to use the handset as if you
were on a normal telephone call.
2. Broadcast Button - Press this button to disable the handset
and activate the innkeeper PBX for use as a digital hybrid.
3. Send 1 Level - Adjusts the signal level that you are sending
down the telephone line, through the female XLR input.
4. Send 2 Level - Adjusts the signal level that you are sending
down the telephone line, through the 3.5mm mini jack input.
5. Caller Level - Adjusts the level of the signal coming in from the
telephone line, as it is going out the output jacks.
6. Headphone Level - Adjusts the signal level coming from the
3.5mm front panel headphone jack.
7. Headphones - The 3.5mm stereo headphone jack contains a
mix of both the Send input audio and the Caller audio.
8. ON LED - Lit when you are on line with a call using the hybrid.
9. Send LEDs - Displays the signal level going to the phone line.
10. Power LED - Lit when unit is plugged in and receiving power.
11. Receive LEDs - Displays the signal level coming from the
phone line, after the DSP. This signal level will not change
when you adjust the Caller knob.
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Features (continued)
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12. Handset Jack - Connect your telephone handset to this jack.
13. Phone Jack - Connect this jack to the handset jack on your
telephone using the supplied handset jumper cable.
14. 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
15. Caller Output - Male balanced XLR output contains only the
caller’s voice.
16. Send 1 Input - Female balanced XLR input for audio going into
the phone line. Mic or line level input.
17. Mic / Line switch - Sets the front end sensitivity of the Send 1
XLR jack. Set to Mic if you intend to connect a dynamic microphone directly to the Send 1 jack. Set to Line if you are con-
necting to the output of a mic mixer.
18. Send 2 Mono Input - 3.5mm mono mini jack input for signals
going into the phone line. Line level.
19. Stereo Output - 3.5 mm stereo mini jack output contains Send
and Caller audio determined by the Send 1 and Send 2 levels
and the Caller level controls. Left channel contains your local
Send audio and right channel contains the Caller's audio from
the telephone line.
20. Power Jack - For connection only to the supplied 9VDC regulated power supply only.
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Connection
Although each application may require a slightly different setup,
there are two primary configurations.
For a direct connection to innkeeper PBX:
• Handset cable - Connect the supplied RJ-22 handset cable be-
tween the jack marked "Phone" on the back of innkeeper PBX
and to the handset jack on the base of your telephone.
• Handset - Connect your telephone handset to the RJ-22 jack on
the back of the innkeeper PBX marked "Handset".
• Send Audio - Connect a dynamic microphone cable to the Send
1 jack on the innkeeper PBX. Be sure to set the Mic/Line switch
to the “Mic” position.
• Output - Connect a stereo cable from the mini jack “Stereo Out”
on the innkeeper PBX to the “Line Input” on your computer
sound card, mini disk recorder or other equipment.
• Power - Connect the supplied DC power supply to the back of
the innkeeper PBX and then to an AC power outlet.
• Place a test call to a quiet location. Set the “A-B-C” switch on
innkeeper PBX for best audio.
• Set the “Send” level control so that while you are speaking into
the microphone, the Send LEDs on the hybrid light the -20 dB
green LED consistently and flash the -9 dB green LED. If you
flash the -3 dB red LED, lower the level. Set the “Caller” control
for good recording level of the caller audio at the output jack.
Computer
Set to
“Mic”
Sound Card
Line
Line
Mic
in
out
in
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