Clear-Com IF4W4 - Manual (Page 7)

I F 4 W 4 4 - C H A N N E L F O U R - W I R E I N T E R F A C E
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OPERATION
INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, broadcast and industrial applications. The ruggedness and high
build-quality of Clear-Com products defines the industry standard. In fact, many
of our original beltpacks and main stations are still in daily use around the world.
We recommend that you read through this manual completely to better
understand the functions of the IF4W4. If you encounter a situation or have a
question that this manual does not address, contact your dealer or call
Clear-Com directly at the factory. Our applications support and service people
are standing by to assist you. (Refer to Chapter 4: “Warranty” for contact
information.) Thank you for selecting Clear-Com for your communications
needs.
DESCRIPTION
The IF4W4 4-channel four-wire interface is a modular interface that enables up
to 4 four-wire communication systems (such as cameras, TELCO lines and
2-way radio) to interface with the Clear-Com intercom system. It matches
standard transmit/receive lines (at normal levels) to Clear-Com line level.
The IF4W4 is powered by the Clear-Com line using standard two-conductor
shielded mic cable. The cable is run from the output connector of a Clear-Com
main or remote station to the rear panel of the IF4W4. One wire carries power,
the other wire carries the intercom signal, and the shield acts as common ground.
For each channel the IF4W4 front panel contains ‘Out’ (transmit), ‘In’ (receive),
‘Null’ level controls and level indicators. For all channels a test jack and a
four-pin headset XLR connector that connects to built-in test oscillators is
provided to set and monitor the circuit nulling of each channel. Press the Null
Test pushbutton for the channel you need to adjust.
The ‘Link’ switches enable you to assign each of the four-wire systems to separate
intercom channels, or put two, three, or all four systems on one party line.
Figure 1-1: IF4W4 Front View
The IF4W4 rear panel provides four three-pin XLR connectors for interfacing up
to four different Clear-Com lines, as well as four terminal block connectors for
4-Wire Interface 4-Wire Interface
In
R L C
Out
Channel B
Null
Channel A Channel C Channel D
In
R L C
Out Null In
R L C
Out Null Link In
R L C
Out
Off On
Null Monitor
Link
Off On
Link
Off On
Null
Test
Null
Test
Null
Test
Null
Test
Level
Link
Power
Level
Link
Power
Level
Link
Power
Level
Link
Power
Null
A + B A + C A + D IF4W4 IF4W4
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