100Basefx Ethernet Port Connection - Weidmuller IE-SW-PL18M-2GC-16TX Hardware Installation Manual

RJ45 (8-pin, MDI-X) Port Pinouts
Pin Signal
1 Rx+
2 Rx-
3 Tx+
6 Tx-
RJ45 (8-pin) to RJ45 (8-pin) Straight-through Cable Wiring
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. As opposed 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 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.
SC-Port Pinouts ST-Port Pinouts
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