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Using the Passport 8100 Modules
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
crossover function internally are known as MDI-X ports (where "X" refers to the
crossover function).
Passport 8000 switch
1
T
R
MDI-X port
Figure A-1.
MDI-X to MDI Cable Connections
A-12
8
8
1
1
RX+
1
2
RX-
2
3
TX+
3
4
4
5
5
6
TX-
6
7
7
8
8
Straight-through cable
(Figure
A-1). Ports that implement the
End station
8
1
1
8
1
TX+
1
2
TX-
2
3
RX+
3
4
4
5
5
6
RX-
6
7
7
8
8
MDI port
T
R
617EF
204515-C
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