Clear-Com EF701M
Interace,4-WIre w/Call Signal

EF701M

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. When used with a Matrix system, the EF-701M allows a party-line channel to be connected to the frame with up to 5000' 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 fiber-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 profile and compact size add to its portability. It can easily be mounted on a utility rack shelf and up to three units will fit 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.

Matrix
For systems where only one or two part-line channels are needed, the EF-701M is ideal. Simply run UTP cable from the Matrix frame to the EF-701M, which is connected to and powered by the party-line system. A rear panel dip-switch on the EF-701M selects connection for the four-wire audio and data as the RJ-45 jack, instead of the DB-15, simplifying set-up.

Call Signaling
In addition to its acting as a visual indicator, call signaling can be used to trigger relays or functions in other intercom equipment. An amber data LED provides the user with continuous status on the data link between two EF-701M's and will indicate whether or not a proper link has been established. The EF-701M also includes internal jumpers to select different baud rates for the RS-422 data.

Nulling Circuitry
The superior hybrid nulling circuitry of the EF-701M allows multiple units to be used together on a single party-line channel. Wide-range controls are provided for audio level adjustments along with three front-panel trim pots for complete hybrid null adjustments.

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 with 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

Applications

• Broadcast facilities, theme parks, campuses, sports complexes, large research and test facilities with fiber-optic infrastructure
• Portable systems requiring long cable runs
• Extend connection lengths between stations or systems up to a mile with standard UTP cable
• Connect a Clear-Com channel to a channel of RTS-TW with fiber or UTP in between
• Connect Clear-Com PL or RTS-TW to a Matrix Plus 3 frame
• Utilize existing, installed UTP to connect intercom locations

Specifications

• 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 (H x W x D): 1.62" x 5.94" x 4.80"
• Weight: 1.75 lbs
• Accessories
  Wiring diagram, adhesive backed
  TS-1 testing earphone

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
• Signalling Tone
  Send frequency: 20kHz ±1KHz
  Receive frequency: 20kHz ±500Hz
  Send level: >=-6dBu
  Receive level: <=-20dBu

Our Part #  EF701M