mITX-SKL-H – User Guide, Rev.1.1
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7.2.
Ethernet Connectors (J5, J8 and J21)
The mITX-SKL-H supports up to four channels of 10/100/1000 Mbit Ethernet:
ETH1 (J21) is based on Intel® Jacksonville i219LM Gigabit PHY with AMT 9.0 support
ETH2 (J5), ETH3 (J8) and ETH4 (J8) are based on Intel® Pearsonville i211AT PCI Express controller
In order to achieve the specified performance of the Ethernet port, Category 5 twisted pair cables must be used with
10/100 MB and Category 5E, 6 or 6E with 1 Gbit LAN networks.
Ethernet connectors can be mounted as follows:
Ethernet ETH1/ LAN1 (connector J21) is mounted together with USB Ports 1 and 2
Ethernet ETH2/LAN2 (connector J5) is mounted together with USB Ports 4 and 3
Ethernet ETH3 and Ethernet ETH4 (connector J8) are mounted together
All connectors support activity and link LEDs
Figure 8: Ethernet Connector with LED Flashing Communication
Table 6: Pin Assignment (RJ45) LAN Connectors (J5, J8, J21)
Pin
Signal
Type
Ioh / Iol
Note
1
MDI0+
2
MDI0-
3
MDI1+
4
MDI2+
5
MDI2-
6
MDI1-
7
MDI3+
8
MDI3-
‘MDI’ – media dependent Interface
Signal Description
Signal
Description
MDI0+ / MDI0-
In MDI mode, this is the first pair in 1000Base-T, i.e. the BI_DA+/- pair, and is the transmit pair in
10Base-T and 100Base-TX. In MDI crossover mode, this pair acts as the BI_DB+/- pair, and is the
receive pair in 10Base-T and 100Base-TX.
MDI1+ / MDI1-
In MDI mode, this is the second pair in 1000Base-T, i.e. the BI_DB+/- pair, and is the receive pair
in 10Base-T and 100Base-TX. In MDI crossover mode, this pair acts as the BI_DA+/- pair, and is
the transmit pair in 10Base-T and 100Base-TX.
MDI2+ / MDI2-
In MDI mode, this is the third pair in 1000Base-T, i.e. the BI_DC+/- pair. In MDI crossover mode,
this pair acts as the BI_DD+/- pair.
MDI3+ / MDI3-
In MDI mode, this is the fourth pair in 1000Base-T, i.e. the BI_DD+/- pair.In MDI crossover mode,
this pair acts as the BI_DC+/- pair.
8 7 6 5 4 3 2 1
LED status:
Orange - 1000 Mb link established
Green - 100 Mb link established
Off - 10 Mb Link established
LED Status
Off
– Link is down
Flashing Green-Link is up and active
Steady Green – Link is up, no activity
