LLU fixes the
first 2 trivially, and makes 3 avoidable.
Excuse my ignorance, but is a DSLAM and the 'exhange' in fact one in
the same (or in the same 'box')?
A telephone exchange is a building that has a nice fast connection back to a
more central telephone exchange. A DSLAM is a device that sits on the other
end of the copper wire to you. It can be in an exchange, assuming you have
copper all the way between you and your exchange.
Nowadays, lots of people have fibre from the telephone exchange to a local
cabinet, and copper from the cabinet to the home. This means you have to
have little DSLAMs in the cabinets, rather than one (bigger) DSLAM in the
exchange. This is the problem with newer subdivisions - it makes it harder
to get the numbers up in order to "DSL enable" a cabinet.