Straight-through wiring, Crossover wiring, Figure 23 – Brocade Communications Systems Brocade 6910 Ethernet Access Switch 53-1002580-01 User Manual
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Brocade 6910 Ethernet Access Switch Hardware Installation Guide
53-1002580-01
Twisted-Pair Cable and Pin Assignments
B
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 this 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.
FIGURE 23
STRAIGHT-THROUGH WIRING
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 this 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.
TABLE 6
10/100BASE-TX MDI and MDI-X PORT PINOUTS
Pin
MDI Signal Name
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
Orange
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Green
Brown
Blue
White/Orange Stripe
White/Green Stripe
White/Blue Stripe
White/Brown Stripe
End B
End A
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable