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BRAS profile & 3/10 days

Community Veteran
Posts: 26,339
Thanks: 595
Fixes: 8
Registered: 10-04-2007

BRAS profile & 3/10 days

Just seen a very informative post on ADSLGuide here

It was in reply to

Quote
Nothing, its just BT will take it as a fault report

May 8th it is said the systems should have a permanent fix in place, which hopefully means Data Rates will track a lot better.

Andrew


Post reads:

Quote
People need to be careful. The Fix BT is putting in is to ensure the first syncronisation with the DSLAM after the services has been converted to Max is picked up. This was being missed in some cases and thus why people had to wait 3 days. BT systems are designed to pick this first sync up, then change the default BRAS profile from that of 2000 (where the most at very low usage times you should get on a speed test is about 1.7M) to the nearest (rounded down to nearest 500K) within at most the first day.

If this first synce happen to be low, then the bRAS profile will be low.

After the first syncronsistion, any further syncronisations which may require a increase in BRAS takes 3 days of a contstantly increased line speed before this occurs. Therefore make sure your internal wiring, filters etc are present and correct before the re-grade day.

Any drop in line rate and the BRAS is moved down straight away, and thus another 3 days of jigher rate is needed before it goes up again. This drop is required to ensure you are not sending more data to the DSLAM than it can put down the copper line as this may impact some applications. The 3 day upwards is to stop the BRAS "flipping & flopping "about, and to reduce the number of BRAS changes as this may have a big impact on the BT internal networks.

Therefore all should have a BRAS relevant to their line rate. However throughput will be contended and thus the thoughput may still be as low as before dependant on the time of day. Therefore do no assume that a low throughput is due to the correct BRAS has been not being set , as this most certainaly will not be the case.

The 10 days only effects this if it is trying to stablise the line, and thus forcing low line rates and thus BRAS profiles. However if the line becames unstable after the 10 days for any reason, then the same thing could happen.

As others have stated in this forum, do thoughput test very early hours in the morning. If you get any thoughput higher than 1.7M, then the default profile is definalty been changed and you are most likely on the correct BRAS profile based on the rules stated by BT. If yourline is synced at 2272 ( line rate) or above and throughput is above 400K for Max or 800K for Max premium, then its within the spec supplied by bt to ISP's (irrespective of what you have been sold!)

You have to remember its all automatic, and BT do not pick AND CHOSE WHO GETS WHAT, THE SYSTEMS DO BASED ON THE LINE CONDITIONS, STABILITY OF THE LINE ETC. ( SORRY COMPUTER NOW STUCK ONCAP LOCK!!!!! :-) )


not english, so my english is not great!!! Sorry
jelv (a.k.a Spoon Whittler)
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