Functional Description
MEN Mikro Elektronik GmbH
32
20A014-00 E2 – 2007-08-16
2.8
Ethernet Interfaces
The A14C has three Ethernet interfaces controlled by the CPU. LAN3 supports
10 Mbits/s and 100 Mbits/s, and LAN1/LAN2 support up to 1000 Mbits/s. All
interfaces support full-duplex operation.
Note: The unique Ethernet address is set at the factory and should not be changed.
Any attempt to change this address may create node or bus contention and
thereby render the board inoperable. A label on the Ethernet connectors of the
board gives the set Ethernet address.
2.8.1
Connection
Three standard RJ45 connectors or two D-Sub connectors are available at the front
panel for connection to network environments. Two status LEDs for each connector
are accommodated at the front.
The pin assignments correspond to the Ethernet specification IEEE802.3.
Table 3.
Signal mnemonics of Ethernet 10Base-T/100Base-TX/1000Base-TX
interfaces
Connection via RJ45 Connectors
Connector types:
• Modular 8/8-pin mounting jack according to FCC68
• Mating connector:
Modular 8/8-pin plug according to FCC68
Table 4.
Pin assignment of 8-pin RJ45 Ethernet 10Base-T/100Base-TX/1000Base-
TX connectors (LAN1..3)
Note: Please note that LAN3 supports only 10/100Base-T!
Signal
Direction
Function
MDX[0:3]+/- in/out
Differential pairs of data lines for 1000Base-T
RX+/-
in
Differential pair of receive data lines for 10/100Base-T
TX+/-
out
Differential pair of transmit data lines for 10/100Base-T
1000Base-T
10/100Base-T
Lights up whenever there is
transmit or receive activity
A
1
MDX[0]+
TX+
2
MDX[0]-
TX-
3
MDX[1]+
RX+
4
MDX[2]+
-
Lights up as soon as the
link is established
L
5
MDX[2]-
-
6
MDX[1]-
RX-
7
MDX[3]+
-
8
MDX[3]-
-
!
1
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