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3-38 Cisco 12012 Gigabit Switch Router Installation and Configuration Guide
Connecting Route Processor Cables
Figure 3-16
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 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
Pin
1
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)
8
Yes
–
–
Receive Data Valid (Rx_DV)
18
Yes
–
–
Collision (COL)
19
Yes
–
–
Carrier Sense (CRS)
2
–
–
Yes
MII Data Input/Output (MDIO)
Jackscrew
Pin 21
Pin 1
H6538
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