Clear-Com Cellcom Instruction Manual download pdf (Page 13)

EF-701M INTERFACE 1-3

Figure 1-1: Connecting a party-line channel to a Matrix intercom

CONVERTING A PARTY-LINE CHANNEL TO 4-WIRE AUDIO

The EF-701M Interface converts a channel of standard or TW party line to 4-wire audio

and, at the same time, converts a DC-voltage call signal or 20-kHz call signal to RS-422

data. This 4-wire audio and RS-422 data can then be sent to a fiber-optic converter

(modem); over copper, unshielded twisted-pair (UTP) cable such as Category 3, 5, or

above; or it can simply be used as an excellent stand alone 2-wire to 4-wire converter. In

most cases though, EF-701M units will be used in pairs, because once the signal is

= Male 3-Pin XLR

= Female 3-Pin XLR

Party-Line Intercom

EF-701M

RJ-45

Matrix

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Clear-Com Cellcom Instruction Manual Page 13