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Troubleshooting and Diagnostics
893-01010-A 4-3
MDI and MDI-X Connections
BayStack switches use MDI-X ports that allow you to connect directly to end
stations without using crossover cables (see Figure
4-1). Ports that implement the
crossover function internally are known as MDI-X ports (where “X” refers to the
crossover function).
Figure 4-1. MDI-X to MDI cable connections
Note: For the transmitter of one device to connect to the receiver of another
device, the sum of crossovers must always be an odd number.
1818
81 81
RX+
RX-
TX+
TX-
TX+
TX-
RX+
RX-
MDI-X port
BayStack 303/304 switch End station
Straight-through cable MDI port
T
R
T
R
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
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8
617EB
89301010.BK Page 3 Tuesday, June 10, 1997 8:00 PM