Ethernet Port Lines
Pin Functions and Descriptions
|
Pin Number |
Signal Name |
Direction |
Description |
|
#10 |
TX+ |
Output |
Positive line of the differential output signal pair |
|
#9 |
TX- |
Output |
Negative line of the differential output signal pair |
|
#2 |
RX+ |
Input |
Positive line of the differential input signal pair |
|
#1 |
RX- |
Input |
Negative line of the differential input signal pair |
The Ethernet port on the EM100 is of the 10BaseT type. The EM100 is fully compatible with all 10BaseT Ethernet hubs and with the vast majority (99%) of 100BaseT hubs. This compatibility is due to the fact that most 100BaseT hubs are actually dual-speed (100/10) devices that automatically detect the type of device connected to each port.
The EM100 is designed to connect directly to an RJ45 Ethernet connector. It features onboard standard magnetics circuitry (YDS part 12F-01N*), providing a seamless ("glueless") interface to the Ethernet network.
To ensure optimal performance, the PCB wire connections between the Ethernet port pins and the RJ45 connector should be kept as short as possible. Excessively long connections can increase the noise levels generated by your PCB, potentially exceeding the maximum radiated emission limits set by FCC and CE regulations. Moreover, longer Ethernet traces on the PCB increase vulnerability to electrostatic discharge (ESD) damage.
* Prior to September 2021, YCL part 20F001N was used.