How to filter and shield an EPS Ethernet interface?

The EMC design for the Ethernet interface of an EPS (typically used for monitoring or advanced communications) must meet high-speed signal integrity and strong anti-interference requirements. Design considerations:

1. Integrated Magnetic Module: Use an RJ45 connector (magnetic module) with an integrated common-mode choke and isolation transformer. This is essential for meeting Ethernet physical layer standards and achieving basic filtering and isolation.

2. Additional Protection: On the chip side (PHY chip side) of the magnetic module, a low-capacitance TVS protection array (e.g., a TVS array specifically for Ethernet) can be added as needed to protect against surges and EFTs.

3. PCB Design: Strictly adhere to differential pair (TX+/TX-, RX+/RX-) routing rules (100Ω impedance control, equal length, tight coupling) and maintain a complete reference plane underneath.

4. Shielding and Grounding: Use shielded RJ45 connectors with their metal shells making good conductive contact with the cabinet panel and grounding. Shielded (STP) or Cat5e or higher cables should be used for the network cable, with the shield grounded at the connector.