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10/100BASE-TX Pin
Assignments
1000BASE-TPin
Assignments
All 100BASE-TX RJ-45 ports support automatic MDI/MDI-X operation, so you can
use straight-through or crossover cables for all network connections to PCs,
switches, or hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of the
cable, are connected straight through to pins 1, 2, 3, and 6 at the other end of the
cable.
Figure 24: RJ-45 Pin Numbers
Table 12: 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
1
Transmit Data plus (TD+)
2
Transmit Data minus (TD-)
3
Receive Data plus (RD+)
6
Receive Data minus (RD-)
4,5,7,8
Not used
a.
The "+" and "-" signs represent the polarity of the wires that make up each wire pair.
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs, servers, or switches.
The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports
require that all four pairs of wires be connected. Note that for 1000BASE-T
operation, all four pairs of wires are used for both transmit and receive.
Table 13: 1000BASE-T MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
1
Bi-directional Pair A Plus (BI_DA+)
2
Bi-directional Pair A Minus (BI_DA-)
3
Bi-directional Pair B Plus (BI_DB+)
4
Bi-directional Pair C Plus (BI_DC+)
5
Bi-directional Pair C Minus (BI_DC-)
a
MDI-X Signal Name
Receive Data plus (RD+)
Receive Data minus (RD-)
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Not used
MDI-X Signal Name
Bi-directional Pair B Plus (BI_DB+)
Bi-directional Pair B Minus (BI_DB-)
Bi-directional Pair A Plus (BI_DA+)
Bi-directional Pair D Plus (BI_DD+)
Bi-directional Pair D Minus (BI_DD-)
– 43 –
Chapter 6
| Port Connections
Copper Cabling Guidelines
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