Business Hub rate not updating.

Question

Hi guys, me again!
It's been a little while so I thought I'd post a problem I've been having with my Business Hub. Effectively when I first got the business hub, the Rate would always match the Max Rate, I.e. when the line capacity changes (which can do because of the length of the line) the rate would change with it. I was happy with this as my Max rate rarely dropped below 1150kbps and so I stayed in that profile. Often it would go up to above to 1300 and the rate would follow even if it didn't mean a change in IP profile.
However, now things have changed. It seems as though the rate doesn't follow the Max Rate and it's actually causing problems. For instance, for the last 2 weeks my rate was stuck at 944kbps (which gives me a profile of 750kbps) while my rate was 1250 with 6.4db noise (which gives me a profile of 1000kbps). I checked the diagnostics and Max Rate dropped below 1150kbps only once for a very short time and it was soon up again to 1200+. What's annoying is that for the last 2 weeks I could have been on a higher IP profile but it simply wasn't updating. Then yesterday the rate went up to 1360 (still in the 1000kbps profile range), yippee I thought, but to no avail as it was down to 1050 (back down to 750 profile) again this morning, despite having a max rate of 1200. It seems as though it rarely updates the Rate if Max Rate is higher, but instantly updates it if it has a lower value.
I don't know why it's begun doing this but as you can see it shouldn't be doing this as its stopping my IP profile from rising despite my Max Rate increasing.
Any help would be greatly appreciated,
Regards,
Mike.

Answer 1

unless you are on a non adsl-max/adsl2 line then what you seem to think happens does not sound at all correct, certainly it is not how either of my lines work (both business hubs),
What happens is that you get a sync, fine, at that stage it determines the amount of data that can be send and that becomes your rate, over the length of the connection the max rate value can vary due I believe to bitloading and fluctuation normal interference on the line but this does not alter the sync rate on any of my lines EVER.
You seem to be losing sync then due to some reason and this causes you to swtch to another rate, either you have a line issue, an internal wiring issue or your target margin is set to low for the line you have (which would mean you get a really good sync during the day but at night it would tend to drop).
Now when you get a new sync and it is in the different IP profile band to the last ones(s) then two things can happen
1 - your sync means you drop a band and in which case this happens within 75 minutes, normally much quicker
2 - Your sync means you should go up a band and this should happen eventuallly.
When going up a band (unless you are on the CN21 88.2% method (which you are not by what you say) then there are two methods that would apply to you depending on your exchange.
Method 1 - 3 days. After 3 days of having a sync rate ALWAYS within the new higher band the profile should change, it does not matter despite what others saty if you have resyncs in between but every single one of them must be in the same band or greater.
Method 2 - Adaptive max. Same rules as above re syncs but the timeframe is much reduced, At the speeds you are talking about it basically works out at 24 hours if jumping 1 band and 12 hours if jumping more than 1 (allow 2 hours extra that these since the update seeems to be a scheduled task).
IN either of the above your profile can stick so if it has not updated within 3 days then you need to contact the mods on this site, posting the results of a bt speedtester and your hub stats and ask for the profile to be checked. They will be able to see the correct value on their systems and the wrong value on the speedtest and so know it is stuck or not.
Stuck profiles in my experience do occasionally get unstuck without any help but so far when this has happened it has been at 3-3.5 days only and if after that time then it never happens.
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