Your ADSL2+ speeds depend on a number of factors. Some are outside of your control - such as the length and quality of the copper wire from your place to the local exchange. Others are within your control, such as:
The blue and green areas on the graph show theoretical maximum speeds for Easy Broadband ADSL2+. This shows how distance affects speeds, as well as differences between ADSL1 and ADSL2+.
Figure 1: Graph showing the maximum speeds in relation to distance of ADSL1 and ADSL2+
The speeds shown on the graph are theoretical maximum speeds for various ADSL protocols on good copper lines. This means no bad joints, faulty insulation, or 'interferers' like bridge taps or loading coils. Actual speeds may vary substantially from these theoretical results, based on:
The most effective way to improve ADSL2+ performance is to have a central splitter installed by a licensed cabler.
You don't live in a laboratory, so the factors above will reduce your performance from the ideal shown in the graph.
In December 2006, we took a sample of 7,305 ADSL2+ services. Each service was connected to our own infrastructure and using the ADSL2+ protocol (G992.5 Annex A ADSL2+ over POTS).
We found the following distribution of download synch speeds:
Over 63% of these customers achieved 10 Mbps download sync or better.
Annex M is available in selected areas and increases the potential maximum upload speed from 1 Mbps to 2.5 Mbps. The factors that affect standard ADSL2+ performance also apply to Annex M - particularly distance and premises cabling.
Again, the 'real world' data is impressive. During December 2006 we took a sample of 401 ADSL2+ services. Each service was connected to our own infrastructure and using the ADSL2+ Annex M protocol (G992.5 Annex M ADSL2+ over POTS).
We found the following distribution of upload synch speeds:
Over 53% of these customers achieved 1.8 Mbps upload sync or better.