Media Independent Interface (MII)

Pinout

40 PIN HI-DENSITY D-SUB FEMALE at the network device.

40 PIN HI-DENSITY D-SUB MALE at the transciever.

Pin	Name	Description
1	V	+5 Vdc/ 3.3 Vdc
2	MDIO	MII Data Input/Output
3	MDC	MII Data Clock
4	RxD	Rx Data
5	RxD	Rx Data
6	RxD	Rx Data
7	RxD	Rx Data
8	Rx_DV	Rx Data Valid
9	Rx_CLK	Rx Clock
10	Rx_ER	Rx Error
11	Tx_ER	Tx Error
12	Tx_CLK	Tx Clock
13	Tx_EN	Tx Enable
14	TxD	Tx Data
15	TxD	Tx Data
16	TxD	Tx Data
17	TxD	Tx Data
18	COL	Collision
19	CRS	Carrier Sense
20	V	+5 Vdc/ +3.3 Vdc
21	V	+5 Vdc/ +3.3 Vdc
22	GND	Ground
23	GND	Ground
24	GND	Ground
25	GND	Ground
26	GND	Ground
27	GND	Ground
28	GND	Ground
29	GND	Ground
30	GND	Ground
31	GND	Ground
32	GND	Ground
33	GND	Ground
34	GND	Ground
35	GND	Ground
36	GND	Ground
37	GND	Ground
38	GND	Ground
39	GND	Ground
40	V	+5 Vdc/ +3.3 Vdc

Note: Direction is DTE (Network device) relative DCE (Transciever).