Ethernet Connectors (J4, J5) - Kontron mITX-BDW-U User Manual

6.2. Ethernet Connectors (J4, J5)

The mITX-BDW-U supports two channels of 10/100/1000 Mbit Ethernet
 LAN1 is based on Intel® Clarkville i218LM Gigabit PHY
 LAN2 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.
Ethernet RJ45 connector Pinout
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.
MDI = Media Dependent Interface
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mITX-BDW-U – User Guide, Rev. 1.6
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