One point I completely forgot was Gigabit Home Network, (G.hn) as a alternative to 1000BASE-T1. It essentially does the same thing and can achieve long ranges. Ultimately this technology is designed to pump 1000Mbps down nasty home wiring, so using it on a single pair of wires is probably going to result in a very good range.
The encoding scheme here is OFDM, aka, break the signal down into multiple signals at different frequencies, and send it down the wire.
It's more robust than SPE, but it requires more costly and larger ICs than SPE. When you can define a connector and cable, SPE is still better in terms of cost and size I believe.
G.hn could have its uses in retrofitting older wiring systems.
The encoding scheme here is OFDM, aka, break the signal down into multiple signals at different frequencies, and send it down the wire.
It's more robust than SPE, but it requires more costly and larger ICs than SPE. When you can define a connector and cable, SPE is still better in terms of cost and size I believe.
G.hn could have its uses in retrofitting older wiring systems.