Estiamated connection speed (ADSL ADSL2+) and related download speeds

[#1]

In another thread on ADSL2+

Quote from: jelv

Incidentally, have you looked at having interleaving turned off - your stats suggest that would be well worth a try.

Out of interest where does the border between the need to have interleaving lie?

[#2]

Plusnet provide ADSL2+ where available on the Premium and Pro products at no extra charge, but it is not available on Value. Policy towards its provision on legacy products is yet to be announced.
Interleaving helps to stabilise longer lines subject to instability, and possibly helps maintain your connection when the noise margin reduces to very low levels. Its downside is higher latency/pings which affects gaming. For non-gamers leaving it on is generally an advantage.