Pinouts >  Network hardware interfaces
40 pin hi-density D-SUB female connector layout
40 pin hi-density D-SUB female connector
at the network device
Pin Name Dir Description
1 V --- +5 Vdc/ 3.3 Vdc
2 MDIO <-> Management Data I/O
3 MDC --> Management 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)
40 pin hi-density D-SUB male connector layout
40 pin hi-density D-SUB male connector
at the transciever
Pinout status: +2 -0
According to 2 reports in our database (2 positive and 0 negative) the Media Independent Interface (MII) pinout should be correct.

Is this pinout
NO DIY devices
Source(s) of this and additional information: Ethernet (IEEE802.3) page at Connectivity Knowledge Platform (Made IT)
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