@Karla the stack power feature comes from the Cisco 9300/3850 switches and on those you just plug a cable from one switch to the next and loop round at the end. You can connect up to 4 switches in one loop.
To power up the switches you only need one power supply in one switch, but obviously need more to use PoE etc.
It is a fantastic system and one I *wish* was on the MS355s etc. In fact it's about the only 3850 feature I really miss.
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