How should TVS filters and capacitor filters be used together in data center switches?

Data center switch power ports use TVS (Transient Voltage Suppressor) and capacitor filters to form a low-pass filter that absorbs high-frequency noise and surge residue. A typical configuration is as follows: A Soundtech SMBJ15A TVS (VRWM=15V clamping voltage 24.4V) is connected in parallel at the input to absorb the initial surge. A 3.3μH power inductor, such as a PWR6045R3R3M0T, is then connected in series, followed by a 100μF electrolytic capacitor and a 0.1μF ceramic capacitor in parallel to reduce ESR. The distance between the TVS and the capacitor is less than 5mm to avoid parasitic inductance causing resonance peaks. This combination reduces conducted emissions at the power port by 22dB@30MHz-100MHz and passes the IEC61000-4-5 ±4kV surge test. The signal port uses a TVS connected in parallel followed by a PBZ1608A-102Z0T ferrite bead (1000Ω@100MHz) to form a π-type filter, which further reduces the measured ESD residual voltage by 35%.