How does poor grounding of a power DTU affect data transmission?

Poor DTU grounding can lead to increased ground noise and common-mode interference, thus affecting data transmission. Excessive grounding resistance (>1Ω) causes ground potential fluctuations, resulting in signal reference level drift and bit errors. Common-mode noise couples to signal lines through ground loops, reducing the signal-to-noise ratio. Solutions include: optimizing the grounding system and using low-impedance grounding materials; deploying a common-mode inductor CML3225A-510T and ESD protection device ESDLC3V3D3B at the signal interface; and using differential transmission and isolated interfaces. Ground noise measured with an oscilloscope should be less than 100mVpp; in bit error rate testing, the bit error rate after grounding optimization should be less than 10^-6. Good grounding is the foundation for reliable data transmission.