Receptacles, Cables, and Pinouts
PA-FE-TX and PA-FE-FX Fast Ethernet 100BaseT Port Adapter Installation and Configuration
1-8
Figure 1-13
PA-FE-TX or PA-FE-FX MII Connection—Receptacle
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
Pin
1
1
Any pins not indicated are not used.
In
Out
In/Out
Description
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)
Jackscrew
Pin 1
Pin 21
H2943