Cisco Systems VIP-FE-TX/4E manual FE-TX MII Connection, Receptacle

VIP Port Adapter Functions

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.

Figure 19 FE-TX MII Connection, Receptacle

Pin 21

H2943

ackscrew Pin 1

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

Table 4 FE-TX MII Connector Pinout

Pin1	In	Out	In/Out	Description
14–17	–	Yes	–	Transmit Data (TxD)
12	Yes	–	–	2
				Transmit Clock (Tx_CLK)
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)

1.Any pins not indicated are not used.

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

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