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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. If you are making 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 by the following illustration, 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 prevent damage to your
eyes, do not stare directly into the laser beam.
