Ethernet Port Lines

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#6

TX+

Output

Positive line of the differential output signal pair

#7

TX-

Output

Negative line of the differential output signal pair

#3

RX+

Input

Positive line of the differential input signal pair

#4

RX-

Input

Negative line of the differential input signal pair

 

Ethernet port of the EM120 is of 10BaseT type. Onboard electronics of the EM120 do not include Ethernet magnetics, so magnetic circuitry must be connected externally. You can use either a standalone magnetics part (such as YCL-20F001N, schematic diagram shown below) or RJ45 connector with integrated magnetics.

 

em120_ether_arrangement

 

 

It is important to make the PCB wire connections between the Ethernet port pins of the EM120 and external magnetics circuitry as short as possible. Making the wires too long may cause the noise level generated by your PCB surpass the maximum radiated emission limits stipulated by FCC and CE regulations. Additionally, longer Ethernet lines on the PCB will make your board more susceptible to the damage from the ESD (electrostatic discharge).