How should TVS switches and common-mode inductors be used together in a data center switch?

The differential signal lines of data center switches use a TVS and a common-mode inductor to form a classic collaborative protection architecture: the TVS (such as ESDLC3V3D3B with a junction capacitance of 1.2pF) is connected in parallel on the connector side to provide transient clamping and absorb the main energy of ESD surges. The common-mode inductor (such as CMZ2012A-900T with a common-mode impedance of 90Ω) is connected in series between the TVS and the PHY to suppress common-mode transient residuals and compensate for the TVS junction capacitance to maintain a differential impedance of 100Ω±15%. The distance between the two should be <10mm to avoid antenna effects. In actual tests, the residual voltage of ±8kV ESD protection by a single TVS is 42mV. After combining with the common-mode inductor, the residual voltage drops to 21mV, and the eye diagram jitter is reduced by 12ps. Similarly, the power port uses an SMBJ58CA TVS in parallel with a CMZ7060A-701T common-mode inductor to suppress common-mode surges.