American Fibertek RRM-3485-4 - Manual (Page 3)

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FIBER CONNECTION
The fiber optic connection is made via a FC/PC connector located on the back of the unit. Be sure to allow
sufficient room for the required minimum bend radius of the fiber cable used.
VIDEO OUTPUT CONNECTION
The video output connection is made via a BNC connector on the back of the unit. The 75
Ω video output can be
looped through typical baseband video inputs of switchers, recorders and other equipment as required. For
proper operation, the output must be terminated with 75
Ω. For optimum performance the video cables should be
the shortest length of coax practical.
DATA INPUT / OUTPUT CONNECTIONS
Data input and output connections are made via a terminal block on the back of the unit. See the drawing above
for proper orientation of input and output connections.
TYPICAL 4-WIRE RS485 DATA CONNECTIONS
4-Wire RS485 data connections are based on industry standard EIA terminology for the transmission of
electronic data signals. Using this terminology, the driver of an electronic signal is labeled TX or data out.
Correspondingly, the receiver of an electronic signal is labeled RX or data in. The plus terminal of the copper
device is connected to the plus terminal of the fiber modem and the minus is connected to the minus. Not all
manufactures follow standard EIA terminology. Consult the installation instructions for your copper device if you
are unsure which two wires are the drive (data out) wires and which two wires are the receive (data in) wires.
Please note that Data In on the RRM-3485-4 becomes Data Out on the MTM-3485-4 or the RRM-3485-4 after
going across the fiber. The reverse flow follows the same orientation.