Installing a Cisco 12008 3-25
Connecting Route Processor Cables
Depending on the type of media you use between the MII receptacle and your switch or
hub, the network side of your 100-Mbps transceiver should be appropria tely equipped wit h
ST-type connectors (for optical fiber), BNC connectors, and so forth.
Figure3-9 shows the pin orientation of the female MII receptacle on the Ethernet port.
Figure3-9 Ethernet MII Receptacle
The MII receptacle uses 2-56 screw-type locks, called jackscrews, to secure the cable or
transceiver to the MII port. MII cables and transceivers have knurled thumbscrews that yo u
fasten to the jackscrews on the MII connector and tighten with your fingers. Use the
jackscrews to secure your MII cable to the MII receptacle.
Table3-3 lists the signals used on the MII receptacle, and Table 3-4 lists the signals used
on the RJ-45 receptacle.
Table3-3 Ethernet MII Pinout
Pin1In Out Input/Output Description
14–17 –Yes –Transmit Data (TxD)
12 Yes –– Transmit Clock (Tx_CLK)2
11 –Yes –Transmit Error (Tx_ER)
13 –Yes –Transmit Enable (Tx_EN)
3–Yes –MII Data Clock (MDC)
4–7Yes–– Receive Data (RxD)
9Yes–– Receive Clock (Rx_CLK
10 Yes –– Receive Error (Rx_ER)
Jackscrew Pin 21
Pin 1
H6538