alt Hacker News> providers install their own Glass Fiber modem
It's the same in the US. The ISP fiber network falls inside their security boundary in my experience - you can't BYOD. They install a modem (these days often including an integrated router, switch, and AP) and you receive either ethernet or wifi from them.
I think the only major change in that regard has been that coaxial cable providers here will often let you bring your own docsis modem these days.
I never found any of this concerning until quite recently. With the advent of ISPs providing public wifi service out of consumer endpoints as well as wifi based radar I'm no longer comfortable having vendor controlled wireless equipment in my home.
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In the U.K. you get a PON which gives you a cat5 gig or mgig port, you then connect your router and pppoe to your ISP. Most ISPs offer a managed router but the ISPs I’ve chosen have always allowed the pppoe option.
Faraday fabric is inexpensive, you can use ethernet to your own router and wrap the isp's in it.
I don’t have fiber access, but at least for cable, my provider (formerly Kabel Deutschland, now Vodafone) allows me to put the modem/router into "modem only" mode, which then allows me to use my own router. Outside of Fritzbox (which is again a whole integrated thing; with questionable features) there aren’t many DOCSIS modems freely available, and the no-name china devices don’t seem much better than my Vodafone Box.