Cisco Systems Cisco 12008 manual Ethernet MII Receptacle

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 appropriately equipped with ST-type connectors (for optical fiber), BNC connectors, and so forth.

Figure 3-9 shows the pin orientation of the female MII receptacle on the Ethernet port.

Figure 3-9 Ethernet MII Receptacle

Pin 1

H6538

Jackscrew Pin 21

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 you 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.

Table 3-3 lists the signals used on the MII receptacle, and Table 3-4 lists the signals used on the RJ-45 receptacle.

Table 3-3	Ethernet MII Pinout
Pin1	In	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)
4–7	Yes	–	–	Receive Data (RxD)
9	Yes	–	–	Receive Clock (Rx_CLK
10	Yes	–	–	Receive Error (Rx_ER)

Installing a Cisco 12008 3-25