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First, is the assigned line profile, which is set by the loop provider (telco), and which gives an absolute upper limit on performance. Getting this changed is a difficult exercise in patience, and may have a fee associated with additional change requests. Apparently, end-users in Australia can use a web-based interface to adjust their own line profiles -- way to go!

BT will do this automatically for you over time. If your signal improves then they'll try to increase your cap. If it gets worse and you're constantly trying to resync then they'll lower your cap.