About 4 years ago I tried to use 10BASE-T1 with PoDL (power over data line) in a robotics project. I gave up after about 18 months of trying to put together the first prototype. I was able to get engineering samples (before they were on the market) of the magnetics and related stuff from Pulse, but I couldn't manage to get a PHY from anyone.
The reason I wanted to use it is power consumption. I had previously planned to use 100BASE-T (normal 100Mbps ethernet) in a robotics project but it turns out that it uses about 0.8W per port (1.6W per cable) so it was using by far using more power than my various microcontrollers. Faster ethernet uses even more power. There is a standard for low power ethernet but it's not a huge improvement and you really have to go out of your way to select components to use it.
I ended up using CAN, but it will be really nice when these standards become well-supported.
The reason I wanted to use it is power consumption. I had previously planned to use 100BASE-T (normal 100Mbps ethernet) in a robotics project but it turns out that it uses about 0.8W per port (1.6W per cable) so it was using by far using more power than my various microcontrollers. Faster ethernet uses even more power. There is a standard for low power ethernet but it's not a huge improvement and you really have to go out of your way to select components to use it.
I ended up using CAN, but it will be really nice when these standards become well-supported.