B Twisted-Pair Cable and Pin Assignments
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 |
| | |
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
EIA/TIA 568B RJ-45 Wiring Standard 10/100BASE-TX Straight-through Cable
White/Orange Stripe
| | Orange | | |
| 1 | White/Green Stripe | 1 | |
End A | 2 | Blue | 2 | End B |
| 3 | 3 | |
| | |
| 4 | White/Blue Stripe | 4 | |
| 5 | 5 | |
| | |
| 6 | Green | 6 | |
| 7 | 7 | |
| | |
| 8 | White/Brown Stripe | 8 | |
| | | |
Brown
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.
28 | Brocade 6910 Ethernet Access Switch Hardware Installation Guide |
| 53-1002580-01 |