A
PPENDIX
C
| Cables and Pinouts
Twisted-Pair Cable Assignments
– 49 –
S
TRAIGHT
-T
HROUGH
W
IRING
If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the two pairs of wires must be straight-
through.
Figure 31: Straight Through Wiring
Table 10: 10/100BASE-TX MDI and MDI-X Port Pinouts
PIN
MDI Signal Name
a
a.
The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
MDI-X Signal Name
1
Transmit Data plus (TD+)
Receive Data plus (RD+)
2
Transmit Data minus (TD-)
Receive Data minus (RD-)
3
Receive Data plus (RD+)
Transmit Data plus (TD+)
6
Receive Data minus (RD-)
Transmit Data minus (TD-)
4, 5, 7, 8
Not used
Not used
White/Orange Stripe
Orange
White/Green Stripe
Green
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EIA/TIA 56
8
B RJ-45 Wiring Standard
1
0/
1
00BASE-TX Straight-through Cable
End A
End B
Blue
White/Blue Stripe
Brown
White/Brown Stripe
