JK Audio Universal Host VoIP PBX Desktop Digital Hybrid User Guide

JK Audio Universal Host VoIP PBX Desktop Digital Hybrid

Thank You
Thank you for purchasing a JK Audio Universal Host Digital Hybrid. Please read this guide for instructions on setting up and using your new product.

Getting Assistance
If you have technical or application questions,
call us M-F: 8:30am-5:00pm (CT)

In the US & Canada (Toll-Free)
800-552-8346
Email us at: support@jkaudio.com
All other countries:
815-786-2929

Or check out our FAQ section for answers to common questions.

Warranty

Limited Warranty
The Universal Host is covered by a 1 year warranty to be free from defective workmanship and materials. To obtain service, contact JK Audio by phone or email for return authorization. Once authorized, you will carefully pack and ship the faulty product and all accessories to us. You will pay for shipping to us and we will pay for return back to you.
This warranty does not cover damages due to accident, weather, fire, flood, earthquake, misuse, unauthorized repairs or modifications, or damages occurred in shipping, only defective workmanship or materials.
There are no expressed or implied warranties which extend beyond the warranty here made.

Features

Features

• 16 bit DSP Technology Caller XLR Line Output
• 16 bit USB Audio CODEC 3.5mm Stereo Line Output
• Proprietary Auto Null Algorithm (50 dB null) 3.5 mm Stereo Headphone Jack
• Send XLR Line Input Send and Caller Signal Level LEDs
• Mic/Line Switch Send and Caller Volume Controls
• 3.5mm Mono Line Input Handset Selector Switch (Electret, Carbon, Dynamic)

In the Box

• Universal Power supply with detachable cord RJ22 Handset Jumper Cable

Overview

Introducing the Universal Host
Universal Host will allow you to send and receive audio through your multi- line PBX, ISDN, VoIP 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.
The 16 bit USB audio CODEC allows stereo recording at up to 48 kHz sampling rate, with the talent voice on the left channel in full bandwidth, and the caller on the right. Play recordings from your computer directly into the phone system. No additional software drivers are needed for the USB audio interface.

What is a Digital Hybrid?
The Universal Host 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 phone line 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 Universal Host 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.

Getting to Know Your Universal Host

Controls & Indicators

1. Handset Button
   Press this button to use the handset as if you were on a normal telephone call.

2. Online Button
   Press this button to disable the handset and activate the Universal Host 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.

5. Caller Level
   Adjusts the level of the incoming caller’s audio as it’s going out the output jacks.

6. Headphone Level
   Adjusts the signal level coming from the 3.5mm front panel headphone jack.

7. Hybrid/USB
   Selects audio heard at the headphone output.

8. Headphones
   The 3.5mm stereo headphone jack contains either a mix of both the Send input audio and the Caller audio when the button is in the Hybrid position or stereo audio from the USB port with the button in the USB position.

9. ON LED
   Lit when you are on line with a call using the hybrid.

10. Send LEDs
    Displays the signal level going to the phone line. The goal is to drive the phone line audio at levels high enough to avoid phone line noise, but not so loud as to cause excessive clipping. Adjust the level control so that you rarely see flashes of the red -3dB peak LED. These flashes should occur only during loud speech bursts. 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 lower the volume control for the input that is causing the clipping.

11. Power LED
    Lit when unit is plugged in and receiving power.

12. Caller LEDs
    Displays the signal level coming in from the phone line, after the DSP. This signal level will not change when you adjust the knob. The level control knob does not change what you see on these LEDs. Adjust the

    level control to give you the best signal level at the XLR output or the Caller channel of the mini jack.

Inputs & Outputs

1. Handset Jack
   Connect your telephone handset to this jack.

2. Phone Jack
   Connect this jack to the handset jack on your telephone using the supplied handset jumper cable.

3. 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

4. Caller Output
   Male balanced XLR output contains only the caller’s voice.

5. Send 1 Input
   Female balanced XLR input for signals going out to the phone line. Mic or line level input.

6. Mic / Line switch
   Sets the front end sensitivity of the Send 1 XLR jack. Set to if you intend to connect a dynamic microphone directly to the Send 1 jack. Set to

   if you are connecting to the output of a mic mixer.

7. Send 2 Mono Input
   3.5mm mini jack input for signals going into the phone line. Line level.

8. Stereo Output
   3.5 mm mini jack contains both Send and Caller audio channels with levels determined by the <Send 1> and <Send 2> level controls and the

   level control. Left channel contains your local Send audio and right channel contains the Caller’s audio from the telephone line.

9. Power Jack
   For connection only to the supplied 9VDC regulated power supply.

10. USB Port
    For bi-directional audio connection to your computer or other equipment. Using the cable provided, you can connect this USB port to your computer or other audio device. This will enable you to send stereo audio to your computer or other recording device with your local audio on the left channel and the caller on the right. You can also use the USB port to play audio from your computer to the phone caller, but it will not be sent to the Caller XLR output jack. It will be mixed with your Send audio on the stereo mini output. You can send and receive audio at the same time through the USB port.

Getting Connected

Note: There are 2 ways to set up the audio equipment for Universal Host.

Connecting to a Multi-Line Phone

1. Connect the supplied RJ22 handset jumper cable between the jack marked on the back of the Universal Host and to handset jack on the base of your telephone.

2. Connect your telephone handset to the RJ-22 jack on the back of the Universal Host marked .
   If you are only using one mic, please continue to Step 3.
   If you are using a mixer with two or more mics, please skip to Step 6.
   Setting up for One Mic/Headphone (No Mixer)

3. Connect a dynamic microphone cable to the <Send 1> jack on the hybrid. Be sure to set the Universal Host <Mic/Line> switch to the position.

4. Connect a headphone to the front of the Universal Host.

5. Connect a stereo cable from the mini-jack on the Universal Host to the on your computer sound card or other recording equipment that has a stereo input. Continue to Step 12.
   Setting up for two or more Mics and a Mixer (Mix Minus Caller)
   Note: A mix-minus signal is an audio signal that contains a mix of your local microphones plus any other audio, minus the Caller’s own voice. Sending the Caller’s audio back to the Universal Host will cause an echo, or feedback.

6. Connect the Universal Host output to any Line input on the mixer.

7. Connect microphone(s) to the mic inputs on your mixer.

8. Connect the mixer’s Mix-Minus bus or Aux Send output (this may be labeled FX or Mon but any Aux bus will work) to the <Send 1> input on Universal Host. Set the Universal Host <Mic/Line> switch to the Line position.

9. If your mixer doesn’t have a mix-minus bus: Whichever input channel you have the connected to, turn the corresponding Aux control to minimum. All Aux controls for other channels should be set for audio sent 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.
   Tip: Using an Aux Send bus that is Pre-Fader allows you to control the levels of each channel to the main output without affecting what is sent to the phone line.

10. Connect your headphones to the mixer.

11. Use Main Outputs to send audio to recording device or broadcasting equipment inputs.
    Completing Setup

12. Connect the supplied DC power supply to the back of the Universal Host and then to an AC power outlet.

13. Place a test call to a quiet location. Set the switch on Universal Host for best audio (See page 8).

14. Adjust the level controls so that you consistently light the green – 20 dB and -9 dB and rarely light the red -3 dB peak Send LED. These flashes should occur only during loud speech bursts. If the red LED stays lit for extended periods you can assume that much of your speech is being clipped or distorted. Set the control for good recording level of the caller audio at the output jack.

Configuration

A-B-C Selector Switch
Use this switch to select the correct type of handset microphone your telephone uses. A=Electret, B=Carbon, C=Dynamic. Your Universal Host will only function correctly if the handset type selector switch is in the correct position. This switch changes signal level, impedance, and wiring to accommodate the differences in handset microphone types. To determine the correct position, you should place a call to another telephone line, then try to send audio to the phone line through the input jack of the Universal Host. While doing this, switch between the three different handset type positions. Choose the position that works best by monitoring the audio quality and LEDs.
While speaking into the microphone, you should see the LEDs lighting only. If the LEDs also light up while you are speaking into the microphone, you may have the switch in the wrong position. If the