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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 these switches, 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.
1
End A
2
3
4
5
6
7
8
Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports are labeled with an
"X" (MDI-X) or neither port is labeled with an "X" (MDI), a crossover must be
implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on
these switches, you can use either straight-through or crossover cable to connect to
any device type.)
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
White/Blue Stripe
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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