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Figure 17: RJ-45 Connector
1
Table 5: 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin
1
2
3
4
5
6
7
8
a.
The "+" and "-" signs represent the polarity of the wires that make up each wire pair.
1000BASE-T
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
Assignments
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.
RJ-45 Pin Numbers
MDI Signal Name
a
Transmit Data plus (TD+)
-52V power (Negative V
port
Transmit Data minus (TD-)
-52V power (Negative V
port
Receive Data plus (RD+)
GND (Positive V
)
port
-52V power (Negative V
port
-52V power (Negative V
port
Receive Data minus (RD-)
GND (Positive V
)
port
GND (Positive V
)
port
GND (Positive V
)
port
– 33 –
Chapter 5
How to Connect to Twisted-Pair Copper Ports
MDI-X Signal Name
Receive Data plus (RD+)
)
GND (Positive V
Receive Data minus (RD-)
)
GND (Positive V
Transmit Data plus (TD+)
-52V power (Negative V
)
GND (Positive V
)
GND (Positive V
Transmit Data minus (TD-)
-52V power (Negative V
-52V power (Negative V
-52V power (Negative V
| Port Connections
1
)
port
)
port
)
port
)
port
)
port
)
port
)
port
)
port
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