Clear-Com EF-701M Encore Audio Conversion 4-Wire Interface

The EF-701M interface converts a single channel of standard or TW party line intercom to four-wire audio, while also converting call signals to RS-422 data (and back).

The EF-701M interface converts a single channel of standard or TW party line 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, ber-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 feet 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 ber-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 prole and compact size add to its portability. It can easily be mounted on a utility rack shelf and up to three units will t 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.

Clear-Com EF-701M Features

• High-quality partyline to 4-wire audio conversion interface
• Maintains hybrid null with multiple units on a channel
• Converts call signals to RS-422 data with selectable baud rate
• Connects intercom with call signal over fiber
• Clear-Com and RTS compatible
• Built-in test tone and jack for nulling
• Multi-mode data status LED
• Powered by the intercom line

• EF-701M Encore Audio Conversion 4-Wire Interface1

• Clear-Com Format
  • Line Characteristics
    • Max Level Before Clipping: >=20dBu
    • Impedance: >=10KΩ
  • Signaling
    • Receive: <=4V DC
    • Send: >=11V DC
• RTS Format
  • Line Characteristics
    • Max Level Before Clipping: >=20dBu
    • Impedance: >=10KΩ>
  • Signaling Tone
    • Send frequency: 20kHz ±1kHz
    • Receive frequency: 20kHz ±500Hz
    • Send level: >=-6dBu
    • Receive level: <=-20dBu
  • General Characteristics
    • Frequency Response:
    • Party Line – Party Line: 200-10kHz ± 3dB
    • Matrix – Party Line: 200-10kHz ± 3dB
  • Distortion
    • Party Line – Matrix: <=0.5%
    • Matrix – Party Line: <=0.5%
  • Noise
    • Party Line – Matrix: <=-50dBu
    • Matrix – Party Line: <=-70dBu
  • Max Gain
    • Party Line – Matrix (CC setting): 20dB ± 3dB
    • Party Line – Matrix (RTS setting): 16dB ± 3dB
    • Matrix – Party Line (CC setting): -5dB ± 3dB
    • Matrix – Party Line (RTS setting): -1dB ± 3dB
  • Min Gain
    • Party Line – Matrix (CC setting): -7dB ± 3dB
    • Party Line – Matrix (RTS setting): -12dB ± 3dB
    • Matrix – Party Line (CC setting): -33dB ± 3dB
    • Matrix – Party Line (RTS setting): -29dB ± 3dB
  • Power Requirements
    • Input Voltage Range: 20-30V DC
    • Quiescent Current: <=70mA
    • Max Current: <=80mA
  • Dimensions (HxWxD): 1.62x5.94x4.8" (41x151x122mm)
  • Weight: 1.75lbs (0.79kg)