How to rectify packet loss during concentrator carrier acquisition?

Packet loss during concentrator carrier acquisition, after ruling out protocol issues, is usually caused by EMC interference leading to signal distortion or a malfunctioning carrier chip. Rectification requires locating the interference source. First, observe the carrier received signal waveform with an oscilloscope to check for noise superposition or amplitude fluctuations. If high-frequency noise is present, add an RC low-pass filter (e.g., 100Ω + 1nF) to the secondary side of the coupling transformer. Check the carrier chip power supply ripple; if excessive, add a PBZ1608E600Z0T ferrite bead and a capacitor for filtering. Check the grounding: ensure the carrier circuit ground is clean; isolate it from the digital ground if necessary using a ferrite bead. Check if the coupling capacitor or transformer is damaged by surges. Check if the power input filtering is sufficient; increase the common-mode inductor value if necessary. Spatially, check if the carrier coupling circuit is affected by the magnetic field interference of nearby switching power supplies; install a shielding cover if necessary. Through targeted rectification, the carrier communication packet loss rate can be reduced from 10% to below 0.1%.