Moxa Technologies EDS-208 manual 100BaseFX Ethernet Port Connection, SC-Port Pinouts, Tx Rx

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	A	A
	B	B
		Cable Wiring
Rx	A	A
	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.

- 8 -