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B.4.4.3 Ethernet Port
Figure B-10 shows the pinout for the Ethernet port (header J7). Note that there are two stan-
dards for numbering the pins on this connector—the convention used here, and numbering
in reverse to that shown. Regardless of the numbering convention followed, the pin posi-
tions relative to the spring tab position (located at the bottom of the RJ-45 jack in
Figure B-10) are always absolute, and the RJ-45 connector will work properly with off-
the-shelf Ethernet cables.
ETHERNET
1
1.
2.
3.
6.
E_Tx+
E_Tx?
E_Rx+
E_Rx?
8
RJ-45 Plug
RJ-45 Jack
Figure B-10. RJ-45 Ethernet Port Pinout
RJ-45 pinouts are sometimes numbered opposite to the way shown in Figure B-10.
Two LEDs are placed next to the RJ-45 Ethernet jack, one to indicate a live Ethernet link
( LNK ) and one to indicate Ethernet activity ( ACT ).
The transformer/connector assembly ground is connected to the RCM3400 Prototyping
Board printed circuit board digital ground via a 0 ? resistor “jumper,” R46, as shown in
Figure B-11.
RJ-45 Ethernet Plug
R46
Board
Ground
Chassis
Ground
Figure B-11. Isolation Resistor R46
The factory default is for the 0 ? resistor “jumper” at R46 to be installed. In high-noise
environments, remove R46 and ground the transformer/connector assembly directly to
ground by soldering a wire between the RJ-45 transformer/connector assembly and
ground. This will be especially helpful to minimize ESD and/or EMI problems.
88
RabbitCore RCM3400
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