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4-Wire Interface with Call Signal, Matrix-to-Party-line
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, fiber-optic converter (modem) or connected to another EF-701M over twisted-pair cable such as CAT-5E.
Clear-Com Format
Line Characteristics
Max Level Before Clipping: >=20dBu
Impedance: >=10KΩ
Signalling
Receive: <=4 VDC
Send: >=11VDC
RTS Format
Line Characteristics
Max Level Before Clipping: >=20dBu
Impedance: >=10KΩ
Signalling Tone
Send frequency: 20kHz ±1KHz
Receive frequency: 20kHz ±500Hz
Send level: >=-6dBu
Receive level: <=-20dBu
General Characteristics
Frequency Response
Party-line – Matrix: 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: 20-30VDC
Quiescent Current: <=70mA
Max Current: <=80mA
Rear Panel Connectors and Controls
Party-line: (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)
