Template for Testing during PoE Design Qualification Phase
Here are some simple recommendations for testing surge reliability during the qualification phase. This particular test regimen was actually implemented by at least one high-profile switch manufacturer, who later reported good correlation with increased field reliability.
Test Level 1
Pass ±1 kV (1.2/50 μs; 8/20 μs) with 42-Ω surge impedance. With 1 min (or less) between successive zaps, apply 10 positive zaps followed by 10 negative zaps. Note that in terms of number of zaps, this is more severe than the mandatory-minimum requirement of 5-positive and 5-negative zaps (as per EN 61000-4-5 and EN 55022).
Test Level 2
Increase the surge voltage in steps of 200 V. Eventually pass ±2 ...