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RJ-45 Plug and RJ-45 Connectors

In a Fast Ethernet network, it is important that all 100BASE-T certified Category 5 cabling use
RJ-45 plugs. The RJ-45 plug accepts 4-pair UTP or shielded twisted-pair (STP) 100-ohm cable and connects into the RJ-45 connector. The RJ-45 connector is used to connect stations, hubs, and switches through UTP cable; it supports 10 Mbps, 100 Mbps, or 1000 Mbps data transmission.

Figure C-4 shows an RJ-45 plug and RJ-45 connector with built-in LEDs.

Figure C-4

Table C-2. lists the pin assignments for the 10/100 Mbps RJ-45 plug and the RJ-45 connector.

Table C-2. 10/100 Mbps RJ-45 Plug and RJ-45 Connector Pin Assignments  
Pin
Normal Assignment on Ports 1 to 8
Uplink Assignment on Port 8
1
Input receive data +
Output transmit data +
2
Input receive data -
Output transmit data -
3
Output transmit data +
Input receive data +
6
Output transmit data -
Input receive data -
4, 5, 7, 8
Internal termination, not used for data transmission

Table C-3. lists the pin assignments for the 100/1000 Mbps RJ-45 plug and the RJ-45 connector.

Table C-3. 100/1000 Mbps RJ-45 Plug and RJ-45 Connector Pin Assignments
Pin
Channel
Description
1
2
A
Rx/Tx data +
Rx/Tx data
3
6
B
Rx/Tx data +
Rx/Tx data
4
5
C
Rx/Tx data +
Rx/Tx data
7
8
D
Rx/Tx data +
Rx/Tx data

NETGEAR, Inc.
http://www.netgear.com
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