I am implementing Power over Data Line in my 10BASE-T1L project. I checked the Würth Electronics webinar video on YouTube "Single Pair Ethernet filter design for industry". The following picture is taken from that [presentation](https://www.we-online.com/web/en/index.php/show/media/06_passive_components_-_custom_magnetics/events_1/webinar_videos/2021_webinars/Single_Pair_Ethernet_Filter_Design.pdfhttps://www.we-online.com/web/en/index.php/show/media/06_passive_components_-_custom_magnetics/events_1/webinar_videos/2021_webinars/Single_Pair_Ethernet_Filter_Design.pdf).
Here, a differential mode inductor is used to inject/takeout DC power on the line. What should be the minimum value of coupled inductor (U3 & U4) for class power (IEEE802.3cg class 10-12)? This might be quite a simple question, but I am very new to circuit design.