How much impact do poor distribution cables from data center switches have on conducted interference?

The PCB layout of differential signal lines in data center switches has a significant impact on conducted emissions. Non-equidistant or non-equidistant traces lead to enhanced common-mode to differential-mode radiation. Measured results show that when the differential line length error is >50mil, the common-mode conversion gain in the 1GHz band increases by 8-12dB; when impedance discontinuity is >15%, conducted emissions in the 100MHz-300MHz band increase by 6-9dB. Design requirements: Gigabit Ethernet differential length error <5mil, characteristic impedance 100Ω±10%; USB 3.0 differential impedance 90Ω±10%; differential pair spacing ≥3 times the trace width, adjacent differential pair spacing ≥5 times the trace width; grounding vias added every 10mm for ground lines. Using a CMZ2012A-900T common-mode inductor from Etymotic can compensate for 5-8mil length errors.