It does! The collision detect signal is repurposed somewhat for PLCA but is in fact working and backwards compatible with 10BASE-T MACs if you ignore the additional functionality. The stations with PLCA will try to avoid collisions with each other but you can barge in and collide with them anyway and it will still work.
The main warts in the standard are dynamic PLCA node ID allocation and the fact that PoDL is undefined for non-point-to-point topologies, besides how odd it is to implement SCCP for PoDL.
I've been thinking that a way around the PoDL aspect is to ignore SCCP and to just use periodic square wave pulse trains with a certain frequency to indicate to the PSE that it should switch power on. Basically an "I know what I'm doing" indicator to prevent sniffer adapters and unterminated connections from being provided live DC voltage.
The main warts in the standard are dynamic PLCA node ID allocation and the fact that PoDL is undefined for non-point-to-point topologies, besides how odd it is to implement SCCP for PoDL.
I've been thinking that a way around the PoDL aspect is to ignore SCCP and to just use periodic square wave pulse trains with a certain frequency to indicate to the PSE that it should switch power on. Basically an "I know what I'm doing" indicator to prevent sniffer adapters and unterminated connections from being provided live DC voltage.