Clear-Com FIM-202D - Manual (Page 9)

Clear-Com Communication Systems
FIM-202D Matrix Fiber Interface Instruction Manual 1 - 3
10. The central matrix receives the intercom panels’ audio and data
signals in the same format in which they were originally sent by the
Matrix Plus 3 or Eclipse intercom panels.
Warning: Always use extreme caution with fiber-optic equipment.
Never look directly into the light port or into the end of
the optical fiber while either FIM-202D unit is operating.
Even if you do not see visible light, eye damage is
possible.
CONNECTING INTERFACE MODULES TO THE CEN-
TRAL MATRIX
With a pair of FIM-202D units you can also remotely connect
Clear-Com rack-mounted Matrix interface modules to the central
matrix. For example, using a Clear-Com CCI-22 dual party-line
interface at one end, you can connect two independent, external 2-wire
party line systems to the central matrix over large distances. Or, with a
Clear-Com TEL-14 Telephone Interface Module, you can send
telephone audio to the central matrix over a secured, interference-free
fiber-optic line. By using a Clear-Com FOR-22 4-wire interface
module, you can send 4-wire audio plus transmit keying over a
fiber-optic line. You can also use a Clear-Com EF-701M to interface
2-wire Clear-Com or RTS party lines to the central matrix over a
fiber-optic link.
Figure 1-3 shows a system with connected interface modules.
CIRCUIT DESCRIPTION
Analog-to-Digital
(A/D) Converters High speed analog-to-digital converters for
each audio channel.
Multiplexer Sequentially presents two RS-422 digital
inputs and two digitized audio signals from the
A/D converters to the optical output driver.
Demultiplexer Takes sequential digital signals from the pin
diode and separates them into 4 separate
lines: two to the D/A converters and two to the
RS-422 transmitters.
Digital-to-Analog
(D/A) Converters High speed digital-to-analog converters for
each audio channel convert the digitized audio
signal back to analog audio.