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3.4 100BASE-FX Module
The 100BASE-FX port module supports a connection to a Fast Ethernet
network segment through a fiber optic connection. The module comes
with two ST connectors. One labeled Tx is used for transmission. The
other one labeled Rx is used for reception.
Figure 3-3 100BASE-FX Port Module
When connecting to a 100BASE-FX device using fiber cable, make sure
the Tx connector of the module is connected to the Rx connector of the
device and Rx connector is connected to the Tx connector of the device.
The required fiber optic cable for the connection is 1300nm 62.5/125
m
m fiber cable. The maximum distance between the module and the
connected device depends on the device connected and the duplex mode
used for the connection as follows:
Device connected
Duplex mode
Maximum length
Computer 100BASE-FX port
Half-duplex
400 meters
Computer 100BASE-FX port
Full-duplex
2K meters
100BASE-FX hub port
Half-duplex
185 meters
100BASE-FX switched port
Half-duplex
400 meters
100BASE-FX switched port
Full-duplex
2K meters
Note:
The 100BASE-FX module does not support auto-negotiation function.
When the port is set at auto-negotiation mode, it will operate in half-
duplex mode automatically.
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