Clear-Com EF-701M 4 Wire Interface Call Signal Converter

4-Wire Interface with Call Signal, Matrix-to-Partyline

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.

Key Features

• 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 fiber-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 RJ-45 or DB-15
• Rugged, compact package can fit up to three across on standard 1-RU rack shelf CC/TW

Technical Specifications

CLEAR-COM FORMAT
Line Characteristics
Max Level Before Clipping
>=20dBu
Impedance
>=10K OHMS
Signalling
Receive
<=4 VDC
Send
>=11VDC
RTS FORMAT
Line Characteristics
Max Level Before Clipping
>=20dBu
Impedance
>=10K OHMS
Signaling Tone
Send frequency
20kHz ±1KHz
Receive frequency
20kHz ±500Hz
Send level
>=-6dBu
Receive level
<=-20dBu
GENERAL CHARACTERISTICS
Frequency Response
Partyline Matrix
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
20-30VDC
Quiescent Current
<=70mA
Max Current
<=80mA
Rear Panel Connectors and Controls
Partyline
(1) XLR3F
RTS
(1) DB-15F
Matrix
(1) RJ-45, (2) Mode Switches
Front Panel Connectors and Controls
TS1 Earphone
(1) 3.5mm Jack Socket
Level Adjust
(2) Rotary Control
Null Adjust
(3) Rotary Control
Power Indicator
(1) Green LED
Data Indicator
(1) Amber LED
Dimensions
1.62 in. H x 5.94 in. W x 4.80 in D
(41 mm x 151 mm x 122 mm)
Weight
1.75 lbs (.794 kgs)
Accessories
Wiring diagram, adhesive backed TS-1 testing earphone