If i were to have two cables running to a HexS with POE (from two different poe switches), would it be possible to use a poe splitter to apply power to the barrel jack, while the other cable is plugged into eth1. The goal here is redundant power. These two cables will be configured for MLAG, but i would like to have power redundancy as well. The poe switches supplying power are model CRS328-24P-4S+RM
Quite possibly yes. AFAIK RB-GPOE works both ways (also as “extractor”), but requires the PSE to work with passive PoE devices. CRS328 can be set to work with passive PoE clients when selected low voltage output (26V), which is great in this case. The only remaining detail is how to “convert” RB-GPOE’s female connector to male (which then plugs into hEX S). A DIY solution: either build a male-male patch cord or replace RB-GPOE’s female connector with male connector.
All MT devices with multiple powering options use source providing highest voltage … so normally hEX S will draw power over PoE in (which will be 48V) and if that one fails, it’ll switch over to barel jack input (which will be 26V). The switch should be unnoticeable, but a while ago one user reported some hiccups during transition (a reboot of powered device at switch in one direction, I forgot which direction it was) so you probably should test the switchover thoroughly to get know what you can expect.
I’ll do some testing with this soon and see how it goes. Much appreciated.