Hack GPON – how to access, change and edit fibre ONTs

BTW: in the EU there is movement towards mandating ISPs allow BYOD, including fibre ONTs.

https://fsfe.org/activities/routers/

I think it's vital that you can run your own modem but I'm not convinced that it's a good idea to force a custom ONT. An ONT is about as dumb as it gets and it's entirely transparent on the stack.

The benefit with an ONT (or even DOCSIS dumb modem) managed by the ISP is that they can do fleet upgrades much quicker as they don't have to keep all old protocols running. For instance the GPON -> XGSPON upgrade that some ISPs are running right now (or DOCSIS 3 upgrade) really only works well if you can turn off the old protocol which requires swapping out all ONTs/DOCSIS modems.

If customers bring their own stuff then you're stuck with these things for much longer.

When I had CenturyLink, I replaced the ONT via a JTAG cable on the new ONT. The stock CL ONT (Calix 716GE-I R2) had a 16384 connection limit, which prevented me from running high-bandwidth Tor relays. The new ONT (Calix 803G) did not.

Calix for some reason makes it easy to clone some models.

I have a post on this: https://www.neelc.org/posts/clone-calix-ont/

Now I'm in NYC with Verizon Fios where I don't need a cloned ONT. Woo! The Verizon ONT is big and has a huge power brick, presumably because of RFoG alongside GPON.