American Fibertek MRX-91685C-SL User Manual
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MTX-91685C-SL DATA INPUT / OUTPUT CONNECTIONS
Data input and output connections are made via terminal blocks on the back of the unit. See the 
drawings below for proper orientation of the input and output connections for each of the two 
data channels. 
 
MRX-91685C-SL DATA INPUT / OUTPUT CONNECTIONS 
Data input and output connections are made via terminal blocks on the back of the unit. See the 
drawings below for proper orientation of the input and output connections for each of the two 
data channels. 
 
TYPICAL SYSTEM DATA CONNECTIONS 
The connection terminology 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. Please note that Data In on the MTX-91685C-SL becomes 
Data Out on the MRX-91685C-SL after going across the fiber. The reverse flow follows the 
same orientation. 
 
DATA MODE 
NOTE: This unit shipped with Data Mode switches in the RS485 4-wire position. 
 
For other configurations of data channel 1 or data channel 2, please refer to the drawing below 
for changes to the default switch settings. These configuration switches are located on the front 
of the unit and can be modified without opening the unit. Please note that switch # 1 and switch 
# 2 are not used and should remain in the off (up) position. 
