Moxa Technologies EDS-208-M-SC - Manual (Page 8)

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RJ45 (8-pin) to RJ45 (8-pin) Cross-Over Cable Wiring
100BaseFX Ethernet Port Connection
The concept behind the SC/ST port and cable is quite straightforward. Suppose
you are connecting devices I and II. Contrary to electrical signals, optical
signals do not require a circuit in order to transmit data. Consequently, one of
the optical lines is used to transmit data from device I to device II, and the
other optical line is used to transmit data from device II to device I, for
full-duplex transmission.
All you need to remember is to connect the Tx (transmit) port of device I to the
Rx (receive) port of device II, and the Rx (receive) port of device I to the Tx
(transmit) port of device II. If you make your own cable, we suggest labeling
the two sides of the same line with the same letter (A-to-A and B-to-B, as
shown below, or A1-to-A2 and B1-to-B2).
SC-Port Pinouts SC-Port to SC-Port Cable Wiring
Tx
Rx
A A
B B
Cable Wiring
A A
B B
ST-Port Pinouts ST-Port to ST-Port Cable Wiring
Tx
Rx
A A
B
Cable Wiring
A A
B B
B
ATTENTION
This is a Class 1 Laser/LED product. To avoid causing serious
damage to your eyes, do not stare directly into the Laser Beam.