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Originally Posted by JustAnotherN00b
No, the limit for 2Mbit has always been approximately 3.5km, or 41dB of line attenuation at 300khz with no DSL CPE installed.
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Maybe but it was not the official line. Now it's confirmed.
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Originally Posted by JustAnotherN00b
What? DSLAMs are DSL Aggregation Modules, the bit that goes in the exchange where all the incoming lines terminate. These do not extend ADSL range in any way, shape or form, they are an essential part of providing ADSL, they are the equivalent of the uBR on a cable network. BT still can't guarantee service to those livuing near the exchange, it's still dependent on the line synchronising properly. What they will do if service cannot be achieved is send an engineer to a customer's site to fit a noise filtering face plate onto the main telephone socket to try and get service to work.
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The exchanges have still been upgraded. Obviously no-one can guarantee service but considering the network BT use, this will be the best change for a lot of people yet to get BB.
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Originally Posted by JustAnotherN00b
Rate Adaptive DSL has been used for a while, ever since the limit for 512k ADSL was extended from 3.5km to 5.5km. It also doesn't actually care how much of the downstream you are using. ADSL is modulated using GDMT, this system involved use of 255 different discrete frequency bins. RF types will know that higher frequencies encounter more resistance and attenuation when transmitted over copper. DSL rate adapts when a line can't maintain the required downstream SNR, the DSLAM at the exchange removes a 'buffer zone' that sits between the upstream frequencies and the downstream ones, which means that you lose the higher upstream frequencies but gain some hopefully cleaner bins for downstream usage. Doesn't really care how much bandwidth you are using.
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As above. It's not perfect but it means more people can get BB than before.
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Originally Posted by JustAnotherN00b
Oh and it's RADSL not RAADSL, Rate Adaptive Digital Subscriber Line.
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oooOOOooo, the pedantics are out in force this morning
