American Fibertek RRM-1485-2F8 - Manual (Page 4)

4
FIBER INPUT / OUTPUT CONNECTIONS
The fiber optic connections are made via ST connectors located on the back of the unit. Be sure
to allow sufficient room for the required minimum bend radius of the fiber cable used. Please
note that Fiber Out on the RRM-1485-2F8 is connected to Fiber In on the MTM-1485-2F8 or
RTM-1485-2F8. The reverse flow follows the same orientation.
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.
RS485 FOUR WIRE INPUT / OUTPUT DATA CONNECTIONS
Data input/output connections are made via a terminal block on the back of the unit. An example
of the RS485 interconnection between the RRM-1485-2F8 unit and the copper device to which it
is attached is shown below. This illustration is 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. 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.
Also, please note that in four wire installations Data In on the RRM-1485-2F8 becomes Data
Out on the MTM-1485-2F8 or RTM-1485-2F8 after going across the fiber. The reverse flow
follows the same orientation.