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Using the Passport 8100 Modules
A-12 204515-C
MDI and MDI-X Connections
For communication to take place between two devices, the transmitter of one
device must connect to the receiver of the other device. The connection must be
achieved through a crossover function, which could be a crossover cable or a port
that implements the crossover function internally.
The Passport 8100 modules use MDI-X ports that allow you to connect directly to
end stations without using crossover cables (Figure A-1
). Ports that implement the
crossover function internally are known as MDI-X ports (where “X” refers to the
crossover function).
Figure A-1. MDI-X to MDI Cable Connections
1818
81 81
RX+
RX-
TX+
TX-
TX+
TX-
RX+
RX-
MDI-X port
Passport 8000 switch End station
Straight-through cable MDI port
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R
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R
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