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Download speedachieved during the test was - 2927 Kbps For your connection, the acceptable range of speeds is 600-7150 Kbps. Additional Information: Your DSL Connection Rate :5120 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM) IP Profile for your line is - 4500 Kbps
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The download speeds reported by the BT Speedtester are often very inaccurate, its only real use is to provide your IP profile and it looks like that has improved somewhat from the earlier tests.
www.mybroadbandspeed.co.uk usually gives a more accurate indication of actual download speed.
Your line still looks like its underperforming somewhat given your low attenuation. This could be caused by one or more of the following:-
Faulty router, unlikely but until another router has been tried it can't be eliminated.
Problem with your internal wiring which is allowing the interference from MW transmissions, again unlikely since that should have been eliminated by connecting to the test socket ( a bitloading graph when connected to the test socket might still be useful )
Problem with the BT line ( or exchange equipment ) which is allowing the interference from MW transmissions.
Now what can you do about it ? You can either live with the problem and as long as your profile stays at about 4500 then maybe that's not too bad, or you can try and get PLusNet and BT to investigate the problem. This, I suspect, isn't going to be that easy, BT will probably say that 4500kbps is well within the acceptable range of speeds for your line and unless you can get the PlusNet faults guys interested in it from the technical point of view of what is causing the interference, then it's going to be hard work.
However, you must have had a low synch event in the past which dropped your profile and should that happen again its likely to be easier to get the fault investigated as the speed under those circumstances is likely to be below the FTH ( Fault Tolerance Threshold ) for your line ( as you were previously getting 5.5 Mbps) and BT would be obligated to investigate.
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.