mITX-BW – User Guide, Rev. 1.6
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6.2.
Ethernet Connectors (J26 & J28)
The mITX-BW supports two channels of 10/100/1000 Mbit Ethernet, one (LAN1) is 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 MByte and Category 5E, 6 or 6E with 1 Gbit LAN networks.
The signals for the Ethernet ports are as follows:
Figure 9: Ethernet Connector J26, J28
Table 12: Pin Assignment J26, J28
Pin
Signal
Type
Ioh / Iol
Note
1
MDI0+
2
MDI0-
3
MDI1+
4
MDI2+
5
MDI2-
6
MDI1-
7
MDI3+
8
MDI3-
Table 13: Signal description
Signal
Description
MDI[0]+ / MDI[0]-
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.
MDI[1]+ / MDI[1]-
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.
MDI[2]+ / MDI[2]-
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.
MDI[3]+ / MDI[3]-
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 Flashing:
10/100/1000 Link
LED Constantly On:
Communication
