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10/100BASE-TX Pin
Assignments
1000BASE-T
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 15: RJ-45 Connector
1
1
RJ-45 pin numbers.
Table 9: 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin
MDI Signal Name
1
Transmit Data plus (TD+)
-52V power (Negative V
2
Transmit Data minus (TD-)
-52V power (Negative V
3
Receive Data plus (RD+)
GND (Positive V
port
4
-52V power (Negative V
5
-52V power (Negative V
6
Receive Data minus (RD-)
GND (Positive V
port
7
GND (Positive V
port
8
GND (Positive V
port
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.
a
MDI-X Signal Name
Receive Data plus (RD+)
)
GND (Positive V
port
Receive Data minus (RD-)
)
GND (Positive V
port
Transmit Data plus (TD+)
)
-52V power (Negative V
)
GND (Positive V
port
)
GND (Positive V
port
Transmit Data minus (TD-)
)
-52V power (Negative V
)
-52V power (Negative V
)
-52V power (Negative V
– 32 –
Chapter 6
| Port Connections
Copper Cabling Guidelines
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port
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port
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port
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port
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port
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