It almost sounds like you're on pair gain, but you say you're on fibre... If you are indeed on fibre, you won't be getting DSL any time soon (even though that's off topic) 😉 Or even more likely, you're on a DLC.
This quote from DSLReports is focused on DSL, but it should give you an idea of what I'm talking about..
<< DLC is A Digital Loop Carrier. An SLC is an AT&T variety, 'lightspan' is another.. you may come across either or any of these terms when hearing why you cannot get DSL. Beginning in the 80s, to save money (copper loops are relatively expensive), Telcos began to install DLC frames around their existing wire centers, particularly in fast growing districts to provide for the flood of new lines required.
These local concentrators, although digital, and fibre optic, were designed before DSL was really available, and do not support it. They do support ISDN, however. It is estimated that nationally around 20% of US telephone lines are served from a DLC (the percentages vary slightly depending on which Telco you are talking about). Furthermore, about half of those DLCs are of an old type that do not support DSL. The newer half are installed capable of supporting DSL, but are only just being enabled for that..
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