Does interference immunity testing of data center switches affect forwarding accuracy?

Data center switch immunity testing (especially RS/CS) can degrade forwarding delay accuracy due to jitter coupling affecting clock recovery circuits. In a measured test, the average forwarding delay of a certain model increased from 2.5μs to 3.2μs under a 10V/m field strength, and the jitter increased from 80ns to 350ns. Corrective measures included: using a series ferrite bead (PBZ1005B-300Z0T, 30Ω@100MHz) at the system clock source output to mitigate edge latency; adding LC filtering (1μH + 10μF) to the PLL power pins; and strictly ensuring equal length and spacing for differential traces. After these measures, the delay drift was <50ns under a 30V/m field strength, meeting the IEEE 1588v2 time synchronization requirement of ±100ns.