

Most of the last mile fiber network is passive (doesn’t require active electronics to pass the signal like DOCSIS/cable internet or ADSL).
Cable and DSL typically have the equivalent of UPSs in their neighborhood nodes, but they often go unmaintained.
Dell Dimension 2400 or a descendant of that?
https://www.dell.com/support/product-details/en-us/product/dimension-2400/resources/manuals
That was THE computer to have in college when I went.