the profile is not directly reduced by disconnection as gouledw explained disconnections result in the exchange raising your noise margin which in turn reduces your connection speed to try and stabilise your connection. the result of the drop in connection speed is to reduce the profile. so as you can see disconnections do not directly reduce your profile but it is the knock on of reduced connection speed
Should I expect to see the effect of the Noise Margin on my sync speed directly?
My current figures look quite good except for a really high noise margin (engineer booked for tomorrow to investigate that as you can hear it on the voice line). Do I just have to ride it out with respect to my IP profile and hope I don't get any low-sync periods in the next 3 days (thus allowing my IP profile to rise)? There was a period of 288kbps yesterday but I rebooted (to fit an broadband accelerator) and it went up to 3500kbps, Overnight it seemed to drop to around 1000kbps (and the connection had been reset around 2am) but stayed rock solid until I rebooted this afternoon whilst I had the power off to test the telephone line.
How do I tell if I dropped to a low sync speed whilst I wasn't looking? I've looked at the Event log but it doesn't seem to record this information (or I've had a very stable sync speed since I rebooted earlier this afternoon). Does it make any difference that I have only had the broadband connected for 8 days?
Speedtester, just done:
Download speedachieved during the test was - 227 Kbps
For your connection, the acceptable range of speeds is 50-250 Kbps.
Your DSL Connection Rate :5152 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 250 Kbps
in the first 10 days of your connection your line is in 'training' as the exchange tries to find the best stable connection for your line. during this time you should leave your connection alone and connected 24/7 with no manual resets. during this time however you may find your router resets once or often and BT do not normally help until the training period is complete.
Your noise margin is high at 15.9 as normal about 6 and with your attenuation I would hope for a connection speed of about 7mb
My line is amazingly STABLE considering the amount of audible noise on the line and I'm really only getting 1 restart a day that I haven't caused myself (and that's within the initial stabilisation period). Getting quite a few FECs (77000 in 3hrs) and CRCs and I wonder if my ridiculously low IP profile of 250kbps compared to my sync speed of around 5000kbps at the moment is allowing the Hub to error-correct and ask for re-transmissions in the gaps between packets without causing data loss. (I believe lost packets is a trigger for a reconnection)
I wonder - is any of that information taken into account by the DLM system which explains why my IP profile is staying low?
your profile will recover but it requires a 24/7 connection and normally 3/5 days sometime it can be sooner in 12hrs but there is no way of telling which category you are in until 12hrs have passed. as long as you can maintain connection then your profile will recover automatically
if you could get your noise margin down to about 6 then you could have a 7mb connection
when engineer is finished ask them to reset your profile save waiting as all their disconnections will reset the time for profile automatically changing