How to improve the uplink interference immunity of the concentrator?

The uplink of the concentrator (e.g., 4G, fiber optic) is crucial for communication with the main station; insufficient interference immunity can lead to data interruption. Improving interference immunity requires addressing interface protection, power supply purification, and software retransmission. Interface protection: For 4G antenna interfaces, install surge protectors (e.g., gas discharge tube 2R090L-6×8) and TVS diodes SMBJ6.5CA. For fiber optic interfaces, ensure the optical transceiver's metal casing is grounded. Power supply purification: Provide an independent DC/DC power supply for the uplink communication module and add a common-mode inductor CMZ2012A-900T and a TVS diode at its input. Software-wise, use reliable transmission protocols such as TCP and implement disconnection reconnection and data retransmission mechanisms. Structurally, place the uplink module in a relatively isolated area within the chassis. Through design, the uplink can maintain connection under IEC 61000-4-5 surge level 4 and IEC 61000-4-4 EFT level 4 interference, achieving a data transmission availability of 99.9%.