speed stats

[#1]

Can anyone tell me what these mean please,these are about the best results I have had but why does BT test show such a slow speed only 76kbps.All tests taken at the same time.
Statistics Downstream Upstream
Line Rate 6112 Kbps 448 Kbps
Noise Margin 5.0 dB 19.0 dB
Line Attenuation 47.0 dB 25.5 dB
Output Power 19.6 dBm 12.3 dBm
Test1 comprises of Best Effort Test:  -provides background information.
    Your DSL connection rate: 6112 kbps(DOWN-STREAM),  448 kbps(UP-STREAM)
    IP profile for your line is - 5000 kbps
    Actual IP throughput achieved during the test was - 76 kbps
April 11th
Today 21:56 4559 kbps (570kB/s) 369 kbps (46.1kB/s) Share
Today 21:47 4567 kbps (571kB/s) 378 kbps (47.3kB/s) Share
Yesterday 20:20 4183 kbps (523kB/s) 374 kbps (46.8kB/s) Share
April 11th

[#2]

Try checking your Exchange VP status here - http://usertools.plus.net/exchanges/ but unfortunately data is a month behind.
Try the PN speedtester - http://www.mybroadbandspeed.co.uk/ at an off peak time.
Also check your profile at the member centre - https://portal.plus.net/my.html?action=data_transfer_speed ; (login required).
It's possible that that BT result is a bum one, there have been a few of late, it would be worth giving it a try at a really quiet time, early hours or early morning if you're about!
Thinkbroadband also have a speedtest that is pretty reliable http://www.thinkbroadband.com/ .
Yes your sync speed/profile is pretty good for that attenuation, hope it stays that way.

[#3]

thanks Anotherone,I've been through all your suggestions and they all seem to give simular answers the BT result must be a duff as you suggest,never the less I will try it again later.My speed as I use the internet is a lot faster than it was so I will presume from that the connection is better,the speed generally is variable but I am a way from the exchange and we have overhead copper wire which is pretty old,I suppose that could account for variations,at least I dont get disconnections which is a God send.