Its your ISP that has to get interleaving switched off, its nothing to do with your phone line.
There is only your ISP that can request this and its not anything you can do by approaching BT yourself.
>> tier 2 support………………nice guy, but really doesn`t know about interleaving
I'm speechless
TBH I think the following sums it up
We have been unable to find any issues with your line and believe your speeds to be within an acceptable level of service.
Your line is fine and shows no problems.
The problems would seem to occur on Tiscalis network, therefore it probably is within their acceptable limits.
I heard from a very reliable source that tiscali were running their network at 150:1 way back in early 2006.. and since then they have a much higher contention ratio.. so go figure
Unfortunately Tiscali have always been a law unto themselves when it comes to congestion through contention right back to the early days of adsl in 2003.
There isnt much guidance as to what is considered acceptable for adsl because it is and always has been run as a contended service and a certain amount of bandwidth does need to be shared in order to make it affordable. The only real guideline is that
BTw state 400kbps.
There used to be a test you could do to check if the contention was on the BTw or the ISP network, but that has now been majorly removed.
There is a way that it can sometimes be accessed but you need to be on IPstream, and you also need to have a very slow throughput speed recorded on the
BTw performance test to enable the trigger for ability to do one of the old style tests.
If youre on tiscali LLU or datastream then the test wont work.