Cisco Systems Cisco 12008 Figure3-10 shows the pin orientation of the female RJ-45 receptacle on the Ethernet port.

Connecting Route Processor Cables
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
3-26
Table3-4 Ethernet RJ-45 Pinout
Figure3-10 shows the pin orientation of the female RJ-45 receptacle on the Ethernet port.
8Yes–– Receive Data Valid (Rx_DV)
18 Yes –– Collision (COL)
19 Yes –– Carrier Sense (CRS)
2–– Yes MII Data Input/Output (MDIO)
22–39 –– – Common (ground)
1, 20, 21, 40 –– – +5.0 volts (V)
1. Any pins not indicated are not used.
2. Tx_CLK and Rx_CLK are provided by the external transceiver.
Pin Signal
1TX+
2TX–
3RX+
4 Termination Network
5 Termination Network
6RX–
7 Termination Network
8 Termination Network
Table3-3 Ethernet MII Pinout (Continued)
Pin1In Out Input/Output Description