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Dual-Speed Stackable Hubs User’s Guide
Making Connections 27
Fast Ethernet Module (DFE-260TX)
A Fast Ethernet module provides one additional twisted-pair Fast Ethernet
connection. A twisted-pair connection of this kind is particularly useful for
creating a link between two DFE-916 series hub stacks, placing them in
separate collision domains. A link of this sort eliminates the need for a
separate switch to separate stacks into separate domains. Separating the
stacks into separate collision domains overcomes the Fast Ethernet two-
repeater limitation, and effectively doubles overall bandwidth.
The recommended use for this module is to connect to another module of
this kind in a second stack.
The Fast Ethernet module uses a MDI-X connector (not a straight MDI-II);
therefore, a crossover cable must be used when connecting the module to
another module (and under most other circumstances). See Appendix A for
pinout information.
The Fast Ethernet module includes the following LED indicators:
• Power/Tx—This LED is lit when the hub is on, and blinks when pack-
ets are being transmitted by the module.
• Link/Rx—This LED is lit when the port is properly connected to a
powered-on device, and blinks when packets are being received by the
module.