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Book Page 2 Friday, June 11, 1999 3:02 PM
C-2
A
C: C
PPENDIX
2
To make a crossover cable, connect TD+ to RD+ and
TD– to RD–.
The cable performs the crossover that is usually performed by the
hub. Figure C-1 shows the pinouts for the crossover cable:
.
Straight-through
10BASE-T cable
1
2
3
4
5
6
7
8
Figure C-1 Straight-Through and Crossover Cable Pinouts
If the file server and client PC function together as a small
network, then either the existing cabling or the hub is failing.
With a correct crossover connection, the LED lights.
I
With a straight-through connection, the LED does not light.
I
With a polarity mismatch (that is, TD+ to RD– instead of TD+
I
to RD+), the LED blinks.
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C
T
ROSSOVER
ABLE
ROUBLESHOOTING
1 2 3 4 5 6 7 8
Crossover
10BASE-T cable
1
TD+
1
TD
2
2
3
RD+
3
4
4
5
5
6
RD
6
7
7
8
8
T
IPS
1
TD+
TD
2
3
RD+
4
5
6
RD
7
8
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