C-2
A
PPENDIX
C: C
ROSSOVER
C
ABLE
T
ROUBLESHOOTING
T
IPS
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:
.
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.
■
With a straight-through connection, the LED does not light.
■
With a polarity mismatch (that is, TD+ to RD– instead of TD+
to RD+), the LED blinks.
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
6
7
8
Straight-through
10BASE-T cable
Crossover
10BASE-T cable
1 2 3 4 5 6 7 8
TD+
RD+
TD
RD
TD+
RD+
TD
RD
Book Page 2 Friday, June 11, 1999 3:02 PM
