Cisco Systems VIP-FE-TX/4E Manual De Usuario

VIP-FE-TX/4E Installation and Configuration  35

The MII receptacle uses 2-56 screw-type locks, called jackscrews (shown in Figure 19), to secure
the cable or transceiver to the MII port. MII cables and transceivers have knurled thumbscrews
(screws you can tighten with your fingers) that you fasten to the jackscrews on the FE-TX port
adapter’s MII connector. Use the jackscrews to provide strain relief for your MII cable. (The RJ-45
modular plug has strain relief functionality incorporated into the design of its standard plastic
connector.) Figure 19 shows the MII female connector.

Table 4 lists the MII connector pinout and signals. MII cables are available commercially.

1. Any pins not indicated are not used.

14–17

–

Yes

–

Transmit Data (TxD)

12

Yes

–

–

Transmit Clock (Tx_CLK)

2

2. Tx_CLK and Rx_CLK are generated by the external transceiver.

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)

22–39

–

–

–

Common (ground)

1, 20, 21, 40

–

–

–

+5.0 volts (V)

ackscrew

Pin 1

Pin 21

H2943