I think many people are slightly confused on the difference between a connection speed and a download speed. Connection speeds are measured in Megabits and your download speed is in Megabytes. Two different things.
A bit of light reading for everyone on this forum
http://opensignal.com/knowledgebase/...nd-megabit.php
ADSL2+ caps out at 24Mb/s (note here its in Mb not MB) So the highest download speed you can achieve on ADSL2+ is 3MB.
Now to add in all the variables that will affect your ADSL2+ download speeds.
- Your distance from the exchange
The location of the item you are downloading
The weather (This is when your archaic copper network will suffer)
The traffic on said copper infrastructure
ANY other item connected to your network at home
There are many more things that can be listed, but this is off the top of my head.
But to my point, its unlikely you'll ever reach that 24Mb/s connection speed, you literally have to be inside or right next door to the exchange to achieve it, unlike fibre NBN, where you can get 100Mb/s from anywhere, any distance.