[neilalexander]

Unless you absolutely need to go 1 kilometre specifically, what are the advantages to this over using G.hn? On shorter runs G.hn will go anything up to 1.8Gbps and will still manage well over 100Mbps on anything up to about 700-800 metres. Even better/further with coaxial instead of twisted pair.

I’ve been using a pair of GIGA Copper G4201TMs to take advantage of twisted pair wiring at home rather than having to rip it out and it also appears more cost-effective: https://www.gigacopper.net/web/en/ghn_faq_en.html