JK Audio Interchange LTD Bedienungsanleitung
JK Audio
User Guide
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
ii
Thank You
Thank you for purchasing a JK Audio Interchange LTD™ Intercom Phone Bridge.
Please read this guide for instructions on setting up and using your new product.
Getting Assistance
If you have technical or application questions:
In the US & Canada, call us toll free at: 800-552-8346
All other countries dial: 815-786-2929 (M-F 8:30-5:00pm Central Time Zone)
Or, check out our FAQ section for answers to common questions.
Limited Warranty
The Interchange LTD is covered by a 2-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, re, ood,
earthquake, misuse, unauthorized repairs or modications, or damages occurred
in shipping, only defective workmanship or materials.
There are no expressed or implied warranties which extend beyond the
warranty here made.
Warnings & Safety Precautions
• Read and keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Clean only with a soft dry cloth.
• Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including ampliers) that produce heat.
• Do not defeat the safety purpose of the three-prong grounding type plug.
If the provided plug does not t into your outlet, consult an electrician for
replacement of the obsolete outlet.
• Do not use this unit if the electrical power cord is frayed or broken. The power
cord should be routed so that it is not likely to be walked on or pinched by
items placed upon or against it.
• CAUTION! To reduce the risk of re or electric shock, do not expose
this apparatus to rain or moisture. Use only No. 26 AWG or larger
telecommunication line cord.
• Refer all servicing to qualied service personnel.
Welcome
Contents iii
Contents
Overview 1
Getting to know your Interchange LTD™
2Controls and Indicators
4Inputs & Outputs
2
Getting Connected
5Intercom
5Mobile Device
6Single Line Phone
5
Operation 6
Technical Information 8
Contents
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
iv
Male and Female 3 Pin
XLR Intercom Loop Jacks
Male XLR Mix Line Out for Monitoring
Send and Receive LED Metering
Front Panel Screwdriver
Level Controls
Front Panel Channel Select
Front Panel Cell Phone Interface
Front Panel TRRS Monitor Headset
Jack with Volume Control
Listen Always,
Talk When Talk-Enabled
Enable/Disable Auto-Answer
16-bit DSP Technology
Front Panel Off-Hook LED
Send and Caller Signal Level LEDs
Features
Universal Power Supply
with Detachable Cord
RJ11 Phone Cord
3.5 mm TRRS Headset Interface
Cable (Part# CN113)
What’s in the Box?
Overview 1
Introducing the Interchange LTD™
Interchange LTD allows remote access to your party-line intercom system.
This 1RU rackmount interface includes a digital hybrid for connection to
analog (POTS) phone lines. The front panel headset interface jack allows easy
connection to your wireless phone, tablet, or computer allowing remote access
through a phone call or conferencing app. The front panel DTMF keypad and
headset jack allow easy call setup.
The Listen-Always design allows both the phone hybrid and the mobile phone
headset interface to monitor the intercom just like any other belt pack. Listen
mode is a high impedance bridging tap on the intercom line. Talk mode is
enabled via a front panel switch, either Off, On, or Auto. Auto follows the phone
hybrid Auto-Answer mode.
The internal digital hybrid connects intercom audio to a standard analog
telephone line without the transmit/receive crosstalk common to analog hybrids.
Its DSP continuously monitors both the phone line and audio signals to deliver
excellent separation. This proprietary, dual-convergence echo canceller algorithm
can achieve excellent separation, typically exceeding 50 dB, without any setup
and without sending a noise burst down the line.
Ready to go?
The Interchange LTD controls and connectors are clearly marked and ready for
operation. If this is your rst 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 nd those deep technical questions are covered on later pages.
Overview
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
2
Getting to Know Your Interchange LTD
1 Talk Control
The position of the three position toggle switch determines when
Interchange LTD will send audio into the Party Line intercom.
Up = Talk: Interchange LTD sends and receives audio (simultaneously).
Use this position with the headset interface.
Center = Off: Interchange LTD functions as a listen-only device. No audio
will be sent into the Party Line intercom.
Down = Auto: Talk function follows the hook state of the innkeeper
Phone Hybrid.
2 Intercom Channel
Up = Audio on Intercom Channel 1/A (Pin 2)
Down = Audio on Intercom Channel 2/B (Pin 3)
3 Talk LED
Indicates audio transmission into the Party Line intercom.
4 Intercom Power LED
Indicates intercom power detected.
5 COM Level LEDs
Indicates audio signal level from the Intercom channel. The 0dB LED
corresponds to a nominal level of -10 dBu on the intercom channel.
6 Phone Level LEDs
Indicates audio signal level from the phone interface.
7 Com Balance
Fine tuning for the intercom hybrid function. Optimizes separation
between send and receive when pushing audio into the intercom with
the Talk function.
Controls & Indicators
2 5 7 10 11 12 13 15 201931
4 8 146 9 16 17 18
Getting to Know Your Interchange LTD 3
Getting to Know Your Interchange LTD
Controls Cont’d
8 Headset Interface Send Level
Adjusts audio signal level to the mobile device.
9 Headset Interface Receive Level
Adjusts audio signal level coming from the mobile device.
10 Headset Interface Jack
Connect to the headset jack of your mobile device with supplied CN113
interface cable if no phone line is available.
11 Auto-Answer
When enabled, Interchange LTD automatically answers an incoming call
and then disconnects after the caller hangs up. Auto answer will occur on
the rst ring.
12 Numeric Keypad
Dial a number.
13 Redial
Press this button to instantly redial the last telephone number.
14 Call Button
Takes the line off-hook; press this button to answer a call or you can
direct a call from your aux phone through the hybrid.
15 OH LED
Lit when you are on line with a call (off-hook).
16 Power LED
Lit when unit is plugged in and receiving power.
17 Drop Button
Press this button to drop (hang up) a call.
18 Signal LEDs
Send LEDs represent the signal level going out to the telephone line.
Caller LEDs represent the signal level coming from the phone line,
after the DSP.
19 Send and Receive Level
Adjusts the audio signal that you are sending down the telephone line and
the level of the incoming caller’s audio as it is going out the Mixout jack.
20 3.5mm TRRS Headset Jack with Volume Control
Monitor Intercom/Hybrid audio with a TRRS headset.
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
4
Getting to Know Your Interchange LTD
53 4
Inputs & Outputs
1 Phone Line
Connect to a standard, single line, analog telephone line.
2 Aux Phone
Connect a single line analog telephone for call setup / dialing, or producer
call screening.
3 Power Jack
For connection only to the supplied 9VDC regulated power supply.
AC power to Interchange LTD is only necessary when interfacing a POTS
line to your intercom system
4 Party Line Intercom
Connect to one or two channel 3-pin unbalanced Party Line
intercom system.
5 Mix Out XLR Jack
Contains a line level mix of both the phone and intercom audio.
21 21
Getting Connected 5
Start by Connecting to the Intercom
1. Set the <Talk> switch to the <Off> position, and the <Com> switch to the
desired channel.
2. Connect Interchange LTD to your intercom network using one or both of the
<Intercom> XLR jacks.
3. As soon as Interchange LTD is connected to the intercom system, the
<Power> LED will light, and the <Com> LEDs will indicate any audio signal
present on the intercom channel.
If using a Mobile Device (If using a phone line, please skip to page 6.)
1. Connect the supplied CN113 interface cable between the front panel
Headset Interface jack and your mobile phone headset jack.
2. Using your mobile phone, place a call to a remote location. You should be
able to immediately monitor the intercom signal from the remote location.
3. Adjust the <Headset Interface Send> level control for desired signal level
at the remote location.
4. Change the <Talk> toggle switch to the <Talk> position to allow the remote
location to be heard on the intercom channel.
5. The return audio path from the remote location into the intercom can be
adjusted two ways. The front panel <Headset Interface Receive> level
control provides adjustment suitable for most mobile devices. However, most
mobile devices also have a headphone level control which works along with
the Interchange controls.
6. It is best to set the headphone level on your mobile device rst, then set
the level on Interchange for nal adjustment. This signal will appear on the
Interchange <Phone> LEDs, not necessarily on the <Com> LEDs. Monitor
receive levels by listening on an intercom belt pack.
Com Balance with Headset Interface
Interchange LTD features an active hybrid to separate the unbalanced 2-wire
intercom audio channel into separate (4-wire) send and receive audio paths.
While nominal separation is achieved with typical operation, the separation can
be ne tuned if the intercom loop offers additional challenges. Perform the tuning
operation when the intercom network is not in use. Using your mobile device, play
or generate a xed level tone or white noise into the intercom system. Adjust the
signal level to 0 dB on the Interchange <Phone> LED display. Be sure that the
<Talk> control switch is in the <Talk> position. Adjust the <Com Balance> control
while observing the <Com> LEDs, to nd the minimum (the position where the
fewest <Com> LEDs are lit). Remove the test signal and proceed with normal
operation.
Getting Connected
Note: AC power is not necessary when using with a mobile device.
Interchange LTD™
Intercom Phone Bridge + Digital Hybrid
6
Operation with a Phone Line
1. Connect the supplied RJ-11 phone line cable between the jack marked
<Line> and your wall jack. Be sure this jack supports standard single line
analog telephone operation.
2. Connect the supplied AC power cord to the back of the Interchange LTD and
then to an AC power outlet.
This device should be connected to an adequate surge protective
device at all times both for the power connector and for the
telephone line to avoid damage from lightning or electrical surges.
3. Your Interchange LTD is now ready to take calls. Along with using the
front panel keypad, you may also connect an auxiliary telephone to the
Interchange LTD <Phone> jack so you can dial out and set up calls, or use
the <Auto-Answer> feature to answer incoming calls.
4. Change the <Talk> toggle switch to the <Auto> position to allow
Interchange LTD to follow the call status of the phone hybrid. During an
active call, the remote location can now be heard on the intercom channel.
5. The signal from the remote location will appear on the Interchange LTD
<Phone> LEDs, not necessarily on the <Com> LEDs. Monitor receive levels
by listening on an intercom belt pack or TRRS Headset.
6. Changing the <Talk> switch to <Off> returns the system to a
remote Listen-Only conguration.
Com Balance with Phone Hybrids
Interchange LTD features an active hybrid to separate the unbalanced 2-wire
intercom audio channel into separate (4-wire) send and receive audio paths.
While nominal separation is achieved with typical operation, the separation can
be ne tuned if the intercom loop offers additional challenges. Perform the tuning
operation when the intercom network is not in use. Interchange LTD does not
have a test tone feature, therefore an alternate tone generator must be used.
Be sure that the <Talk> control switch is in the <Talk> position. Adjust the
<Com Balance> control while observing the <Com> LEDs, to nd the minimum
(the position where the fewest <Com> LEDs are lit). Remove the test signal and
proceed with normal operation.
Operation
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