> The great thing about PoE standards is there's so many to choose from. There is nothing to choose there. They're supersets of each other with increasing pow

> The great thing about PoE standards is there's so many to choose from. There is nothing to choose there. They're supersets of each other with increasing power budget, each including the previous revision as lower power classes. (and PoDL is not PoE; PoDL is for automotive ethernet, which has nothing to do with the RJ45 you see everywhere on consumer/business IT. You never choose between PoDL and PoE, the choice is made when you decided between Xbase-T vs. Xbase-T1.) > ethernet introduces a degree of non-determinism with respect to time in the link layer That's what TSN is for, cf. sibling comment. > plus increased bringup times That's generally an IP problem, not Ethernet. > a potentially more costly core switching fabric I guess it depends on your application; a TSN-capable 8-port automotive ethernet switch is $10: https://www.digikey.com/en/products/detail/microchip-technology/LAN9374T-I-ZMX/16915551 https://www.digikey.com/en/products/detail/microchip-technol... (non-TSN non-automotive is cheaper…) > heterogeneous infrastructure costs Automotive ethernet is supposed to replace CAN and the various heterogeneous higher-speed interfaces that were added to deal with higher bandwidth requirements with a homogeneous ethernet world :) (Source: I work on some software remotely related to some of this shit. Which does mean I'm biased since I don't know whether it will in fact proliferate, I just make it work ;)