EDS-405 User’s Manual
100BaseFX Fiber 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 are making your own cable, we suggest
labeling the two sides of the same line with same letter (A-to-A and B-to-B, as
shown below).
SC-Port
Pinouts
SC-Port to SC-Port Cable Wiring
Tx
Rx
A
A
B
B
Cable Wiring
A
A
B
B
Fiber Port
SC
Connector
SC
Connecto
Tx
Rx
Fiber Port
r
Rx
Tx
ST-Port
Pinouts
Tx
Rx
A
A
B
B
Cable Wiring
A
A
ST-Port to ST-Port Cable Wiring
B
B
Fiber Port
ST
Connector
ST
Connecto
Tx
Fiber Port
Rx
r
Rx
Tx
3-8
