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4 Ch. 4-wire interface

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The IF4W4 modular 4-wire interface connects camera intercoms,
two-way radios, fiber optics, and other 4-wire devices to a standard
Clear-Com intercom line. The 1-RU chassis holds up to four individual
interface modules, each with its own 4-wire terminal block and
XLR-3M connector to interface with Clear-Com.
The IF4W4 accepts balanced or unbalanced 4-wire input and is
transformer isolated. It is powered by the Clear-Com intercom line,
using standard two-conductor shielded mic cable.

Front Panel Capabilities

Front-panel controls allow the user to adjust the operating
parameters for each interface module, optimizing the interface
between the 4-wire device and the party line. Capabilities include:
adjusting the transmit and receive levels between the intercom
system and the 4-wire line; optimizing the hybrid null balance;
switching the transmit level between mic and line level; and
emulating either a carbon or a dynamic microphone. A two-color
LED transmit-level indicator gives a visual indication of send levels
to the transmit lines.
A front-panel test jack is connected to a built-in oscillator. Using
the null control and an earphone with a 1/8” plug or 4-pin headset,
the user can quickly null the send/receive hybrid. Set-up switches
allow the user to assign the interfaced devices to separate intercom
channels, or to assign any or all to a single party line.


Each interface module has its own set of transformer-isolated
connectors. The terminal block provides a pair of connections for
both transmit and receive signals, with a 600-ohm load across the
receive line. An XLR-3M connector provides the link between the
interface and the Clear-Com intercom line.


  • 4-Channel 4-Wire to Partyline Interface
  • Interfaces TV cameras, 2-way radios, fiber circuits and other 4-wire devices to Clear-Com partyline
  • Individual Transmit Receive and Null controls
  • Transmit output switchable between mic and line level
  • Built-in test jack and oscillator for quick nulling
  • Selective partyline capability
  • Accepts balanced or unbalanced 4-wire input
  • Transformer isolated
  • Terminal block and XLR connectors for each interface
  • Powered by the intercom line

Data Sheet

Shipping & Returns

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Our full policy is in our Terms and Conditions page.
Pandemic Availability Notice

Please Note: Due to unprecedented raw material and component shortages for finished goods throughout our industry, lead times for items that aren't currently in stock are longer than normal and cannot be guaranteed at present. Equipment needed by a firm date must be noted at time of order. While VLS cannot guarantee delivery by those dates, we will work with our suppliers to do everything possible to meet deadlines. We apologize for the inconvenience and appreciate your patience.

Same Day Shipping Cutoff time
(Due to Pandemic-related availability issues, this policy is currently suspended)

Online orders received by noon Eastern time typically ship the same day. If your delivery due date is critical please note your due date in the order messages at checkout, and then contact us.

Why Noon? Well, while we stock quite a few items in our warehouse, many items we have dropshipped by our vendors. They need time to process the order, so to ensure that we can get the order to the vendor and give them enough time to ship it out the same day, we need to get the order to them as early as possible in the day.

Shipping Rating

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Returns Policy

We understand things happen and items occasionally need to be returned. To make things as hassle-free as possible, we have dedicated pages about our Returns Policy (what’s eligible to be returned) and our Return Process (how to go about returning eligible items)

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