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Originally Posted by APS
Are you saying they should guarantee the speed for a given sync rate? In general I believe they do not guarantee the sync rate, hence the need for the presales speed tester, which takes into account distance to the nearest cabinet and reports a lower than ideal speed. (Something which should not be a problem with VM due to the better quality cable for instance.)
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Openreach guarantee 30mbps of downstream capacity and 20mbps of upstream capacity for each 80/20 customer, i.e. you'll always be able to get full upstream to your ISP. What your ISP does with it is their business...
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First I believe if you use the BT test site (http://speedtester.bt.com/) the diagnostic option for the test results shows your sync speed and your performance against it. I am not sure where that info comes from? For us it reports the 20 Mb upload speed and the low performance in comparison to it.
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That only ever reports the upstream speed as the maximum of the service you chose to subscribe to, and is not in any way linked to your actual sync speed.
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I did not mention before, that although our service is carried over BT Openreach, we bought the service through Zen. They did not mention the possibility of a BT bug, I think after a couple of test power cycles on the BT modem, I will probe them as to whether this bug might be affecting me.
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Might be worth checking over on Thinkbroadband's forums, the folk over there have a lot more experience with BT/Openreach/FTTC problems. I do know a number of ISPs using BT Wholesale have had this problem, including BT Retail but it seems other providers are either worse affected or just have bad luck...