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B
Cables
Pin
1
2
3
6
4,5,7,8
Note:
The "+" and "-" signs represent the polarity of the wires that make up each wire
pair.
Straight-Through Wiring
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. (When
auto-negotiation is enabled for any RJ-45 port on the switch, you can use either
straight-through or crossover cable to connect to any device type.)
You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet connections.
End A
B-2
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts
MDI Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Receive Data plus (RD+)
Receive Data minus (RD-)
Not used
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
White/Orange Stripe
White/Green Stripe
1
2
3
4
White/Blue Stripe
5
6
7
8
White/Brown Stripe
Figure B-2 Straight-through Wiring
MDI-X Signal Name
Receive Data plus (RD+)
Receive Data minus (RD-)
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Not used
Orange
Blue
Green
Brown
1
2
End B
3
4
5
6
7
8
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