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 EF-701M 4-Wire Interface with Call Signal Features and Specifications:
•Line Characteristics: Max Level Before Clipping: >=20dBu Impedance: >=10K
•Signalling: Receive: <=4 VDC Send: >=11VDC
•RTS Format: Line Characteristics Max Level Before Clipping: >=20dBu Impedance: >=10K
•Signalling Tone: Send frequency: 20kHz ±1KHz
•Receive frequency: 20kHz ±500Hz
•Send level: >=-6dBu
•Receive level: <=-20dBu
•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
•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)
