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Clear-Com EF-701M 4-Wire Interface

Model: EF-701M

Clear-Com EF-701M 4-Wire Interface
Clear-Com EF-701M 4-Wire Interface
Clear-Com EF-701M 4-Wire Interface
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About: Clear-Com EF-701M 4-Wire Interface

The EF-701M interface converts a single channel of standard or TW partyline intercom to four-wire audio, while also converting call signals to RS-422 data (and back). The resulting four-wire audio plus RS-422 data can then be sent to a Clear-Com Matrix port, fiber-optic converter (modem) or connected to another EF-701M over twisted-pair cable such as CAT-5E. 

When used with a Matrix system, the EF-701M allows a party-line channel to be connected to the frame with up to 5000' of cable. With its excellent hybrid null and wide-range level controls the unit may also be used as a best-quality stand-alone two-to-four-wire converter.

For travelling systems that require long connecting runs between stations or systems, EF-701M's can quickly recover their cost in space and weight savings, as fiber-optic and UTP cables are lighter and more compact than standard shielded mic cable. Two EF-701M's can be connected directly to each other over low-cost four-pair, unshielded, twisted-pair cable (UTP). The EF-701M's low profile and compact size add to its portability. It can easily be mounted on a utility rack shelf and up to three units will fit across in a standard 1-RU rack space. No additional power connection is required, as the EF-701M obtains its DC operating current through the party-line connection on pin 2 of the XLR connector.

For systems where only one or two part-line channels are needed, the EF-701M is ideal. Simply run UTP cable from the Matrix frame to the EF-701M, which is connected to and powered by the party-line system. A rear panel dip-switch on the EF-701M selects connection for the four-wire audio and data as the RJ-45 jack, instead of the DB-15, simplifying set-up.

Call Signaling
In addition to its acting as a visual indicator, call signaling can be used to trigger relays or functions in other intercom equipment. An amber data LED provides the user with continuous status on the data link between two EF-701M's and will indicate whether or not a proper link has been established. The EF-701M also includes internal jumpers to select different baud rates for the RS-422 data.

Nulling Circuitry
The superior hybrid nulling circuitry of the EF-701M allows multiple units to be used together on a single party-line channel. Wide-range controls are provided for audio level adjustments along with three front-panel trim pots for complete hybrid null adjustments.


  • High quality party-line to four-wire audio conversion
  • Maintains hybrid null with multiple units on achannel
  • Converts call signals to RS-422 data with selectable baud rate
  • Connect intercom with call signal over fiber-opticsystems
  • Clear-Com and RTS compatible
  • Built-in test tone and jack for nulling
  • Multi-mode Data status LED
  • Powered by intercom line
  • Connects with standard XLR's and RJ-45 or DB-15
  • Rugged, compact package can fit up to three across on standard 1-RU rackshelf CC/TW


  • Broadcast facilities, theme parks, campuses, sports complexes, large research and test facilities with fiber-optic infrastructure
  • Portable systems requiring long cable runs
  • Extend connection lengths between stations or systemsup to a mile with standard UTP cable
  • Connect a Clear-Com channel to a channel of RTS-TWwith fiber or UTP in between
  • Connect Clear-Com PL or RTS-TW to a Matrix Plus 3frame
  • Utilize existing, installed UTP to connect intercom locations

Reviews: Clear-Com EF-701M 4-Wire Interface

There are currently no product reviews.

Warranty: Clear-Com EF-701M 4-Wire Interface Warranty:

30 Days

Manufacturer's Warranty:

All Clear-Com brand systems and products, including wired and wireless belt packs, have a Limited Warranty of two years, with the following exceptions:

  1. Clear-Com headsets, handsets, microphones, UHF wireless IFB products, and the following DX and PRO products: AC850 Charger, BAT850 Battery, BAT41 and BAT850 batteries, HS12, headsets, remote antenna cables, SP10 Speaker, XLR Adapters and HS20-2 headsets have a Limited Warranty of one year.
  2. Cables, accessories, components and consumable items including the BP850 battery sled, Beltpack antennas, Beltpack configuration cable, HS4-2 Earpiece, RMK850 Mounting Kit, RAK850 Remote Kit, Beltpack pouch, DX headset extension cable, HS4-3 Earpiece, HSI6000, RMK200, Splitter/Combiner, WS200 Battery Sled, Foam inserts in travel case, CAT-5 cable, base antenna have a Limited Warranty of 90 days.
  3. Any Clear-Com product that has been classified as obsolete at the time of sale has a Limited Warranty of 90 days from sale and will be replaced with the same product or a sales credit will be issued, at the sole discretion of Clear-Com. 
  4. Clear-Com PRO 850 series wireless base station and Beltpacks have a Limited Warranty of three years.
  5. Clear-Com UHF WBS Analog wireless intercom systems have a Limited Warranty of three years.
  6. All software products, including Concert (Client and Server), ECS, EHX, Production Maestro Pro and Logic Maestro are warranted for one year and shall substantially conform to published specifications. The media on which the Software is furnished is warranted to be free of defects in material and workmanship (under normal use) for a period of one year.

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