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We need to see the line stats from your router if you can find and post them. Those will tell us fairly accurately what Annex A speeds you could expect from ADSL2+, and those in turn will tell us whether Annex M will be worth having.
In general, with an Annex A downstream connection of 16Mbps or less you lose about 2.5Mbps downstream by going to Annex M, with no significant upstream increase above the 1.1 or 1.2Mbps you will get on Annex A. As the Annex A downstream rises towards 20Mbps the loss on Annex M is less and the upstream increase is greater.
The short explanation is that Annex M pinches the lower downstream frequencies to add to the upstream ones, and at high attenuations there is insufficient capacity in the additional (ADSL2+) downstream ones to compensate for the loss, and the pinched ones have a similar effect when used for upstream - they may hardly contribute.
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Plusnet Value Fibre.
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Edited by RobertoS (Fri 08-Jun-12 18:16:52)