Hardware Installation Guide User Manual

28 Brocade 6910 Ethernet Access Switch Hardware Installation Guide
53-1002650-02
B
Twisted-Pair Cable and Pin Assignments
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.
FIGURE 24 CROSSOVER WIRING
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
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable