EF-701M INTERFACE 1-5
in Figure 1-3. At the other end of the fiber there is another EF-701M unit and PL system
with walkie-talkies interfaced through a TW-47 Interface. The EF-701M allows the
people on the first PL system to communicate with the people on the walkie-talkies over a
kilometer of fiber, with the call signal determining transmit or receive operation.
Figure 1-3: Interfacing two party-line systems over a kilometer of fiber
Note: The terms modem, codec, and interface all refer to devices that convert one type of
signal for transmission or reception to a different type of signal.
Because of the EF-701M’s low profile and compact size, it can function either as a
stand-alone device, or it can be mounted on utility rack shelves. Up to three units will fit
3
3
= Male 3-Pin XLR
= Female 3-Pin XLR
Party-Line Intercom
EF-701M
EF-701MFiber Modems TW-47
PK-7
Base
Walkie
Talkie
Remote
Walkie
Talkies
3 3
3
3 DB15 3DB15 3 3 3 DB9
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