Clear-com EF-701M Four-Wire Interface

Clear-com EF-701M Four-Wire Interface

Clear-com 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.

• High quality party-line to four-wire audio conversion
• Maintains hybrid null with multiple units on a channel
• Converts call signals to RS-422 data with selectable baud rate
• Connect intercom w/call signal over ber-optic systems
• 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 RJ45 or DB-15
• Rugged, compact package can fit up to three across on standard 1-RU rack shelf CC/TW

• Clear-com Format

Line Characteristics

Max Level Before Clipping: >=20dBu

Impedance: >=10KO

• Signaling

Receive: <=4V DC

Send: >=11V DC

• RTS Format

Line Characteristics

Max Level Before Clipping: >=20dBu

Impedance: >=10KO

• Signaling Tone

Send frequency: 20kHz ±1kHz

Receive frequency: 20kHz ±500Hz

Send level: >=-6dBu

Receive level: <=-20dBu

• General Characteristics

Frequency Response: Partyline - Partyline: 200-10kHz ± 3dB

Matrix - Partyline: 200-10kHz ± 3dB

• Distortion

Partyline - Matrix: <=0.5%

Matrix - Partyline: <=0.5%

• Noise

Partyline - Matrix: <=-50dBu

Matrix - Partyline: <=-70dBu

• Max Gain

Partyline - Matrix (CC setting): 20dB ± 3dB

Partyline - Matrix (RTS setting): 16dB ± 3dB

Matrix - Partyline (CC setting): -5dB ± 3dB

Matrix - Partyline (RTS setting): -1dB ± 3dB

• Min Gain

Partyline - Matrix (CC setting): -7dB ± 3dB

Partyline - Matrix (RTS setting): -12dB ± 3dB

Matrix - Partyline (CC setting): -33dB ± 3dB

Matrix - Partyline (RTS setting): -29dB ± 3dB

• Power Requirements

Input Voltage Range: 20-30V DC

Quiescent Current: <=70mA

Max Current: <=80mA

• Dimensions

1.62 x 5.94 x 4.8in (HxWxD)

(41 x 151 x 122mm)

• Weight

1.75lbs (0.79kg)