Cisco Systems manual PA-FE-TX or PA-FE-FX MII Connection-Receptacle

Receptacles, Cables, and Pinouts

Figure 1-13 PA-FE-TX or PA-FE-FX MII Connection—Receptacle

Pin 21

H2943

Jackscrew Pin 1

Table 1-2 lists the MII connector pinout and signals. MII cables are available commercially and are not available from Cisco Systems. Table 1-2 refers to MII cables used between the MII connector on the PA-FE-TX and an appropriate transceiver. The connection between this transceiver and your network can be Category 3, 4, or 5, 150-ohm UTP or FTP, or multimode optical fiber.

Table 1-2	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)

1Any pins not indicated are not used.

2Tx_CLK and Rx_CLK are generated by the external transceiver.

1-8PA-FE-TX and PA-FE-FX Fast Ethernet 100BaseT Port Adapter Installation and Configuration