[throw0101a]

> It powers access points, lighting, and infrastructure, and high power variants can do 100W+.

802.3bt Type 4 allows for sending 100W down Cat 6A cables, but only 71W is available at the other end. That's highly inefficient.

* https://en.wikipedia.org/wiki/Power_over_Ethernet#Standard_i...

[upofadown]

The loss is proportional to the length and ethernet cables are usually much shorter than the maximum length allowed by the standard.