Take a read through this http://www.kitz.co.uk/adsl/equip.htm
The information is old but essentially still how it works.
The only real different with FTTC is that the DSLAM is in the street cabinet and there's a fibre link that connects it to the layer 2 switch (which connects to the various supplier backhals) in the exchange.
For example Sky have their own backhaul network, seperate to that of BT Wholesale.
Edited by lee111s (Sat 02-Apr-16 15:34:11)