Why such a large amount - Noise Margins

[gamesaregood]

Hello everyone,

Im such on my 512kbps line at the moment have have been since Feb 2003. But my ISP will soon be upgrading me to ADSL max so i have been looking at my stats.

BT Says:

ADSL: 512kbps
MAX: "Should be able to support" At Least 1.5mbps

Most the time i get about 45 - 47 Line Att which does not seem to change all the much, its the Noise Margin which seems to just drop at random points, seem below:

Currently:

So its jumped by 29 to 16, thats such a lot, i really am conserned about how MAX is going to be affected by this kind of thing.

Any Advise?

Thanks,

Michael

 

[tolien]

When it's at it's highest, you'll get a higher sync rate.
When it drops, you'll lose sync, towards the minimum SNR margin.

 

[Phil99]

When it's at it's highest, you'll get a higher sync rate.
When it drops, you'll lose sync, towards the minimum SNR margin.

Yup, and when it drops it'll be exactly when you don't want it to, e.g. in the middle of an online game.

Generally with SNR drops they raise the SNR target margin and enable interleaving, but with drops as extreme as that I'd be more concerned with finding the cause of the changes before finding a solution.