28 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 WiringIf 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 WiringIf 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 BEnd A