Chapter 5
| Network Connections
How to Connect to the RJ-45 Port
– 30 –
10/100BASE-TX Pin
Assignments
Most 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 14: RJ-45 Connector
1000BASE-T Pin
Assignments
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs or servers, switches or
hubs.
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
Table 5: 10/100BASE-TX MDI and MDI-X Port Pinouts
PIN
MDI Signal Name
a
a.
The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
MDI-X Signal Name
1
Transmit Data plus (TD+)
-52V power (Negative V
port
)
Receive Data plus (RD+)
GND (Positive V
port
)
2
Transmit Data minus (TD-)
-52V power (Negative V
port
)
Receive Data minus (RD-)
GND (Positive V
port
)
3
Receive Data plus (RD+)
GND (Positive V
port
)
Transmit Data plus (TD+)
-52V power (Negative V
port
)
4
-52V power (Negative V
port
)
GND (Positive V
port
)
5
-52V power (Negative V
port
)
GND (Positive V
port
)
6
Receive Data minus (RD-)
GND (Positive V
port
)
Transmit Data minus (TD-)
-52V power (Negative V
port
)
7
GND (Positive V
port
)
-52V power (Negative V
port
)
8
GND (Positive V
port
)
-52V power (Negative V
port
)
1
1
