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BT Wholesale releases Max briefing to providers
Monday 26 June 2006 10:54:00 by Andrew Ferguson

In an attempt to address some of the complaints raised about the BT Wholesale Max products, a briefing has been issued to the service providers which details a change to the systems. The full briefing is shown below:

"'BLIP LOGIC' FIX To improve the experience for end user customers we have introduced a fix which takes account of the historical stability of the line when encountering a one off low synchronization event. This is known as the ‘Blip logic’ fix. The Blip Logic fix introduces the ability for stable BT IPstream Max (or BT IPstream Max Premium) line not to wait 3 days to move to a higher BRAS profile after a single isolated event of low line rate synchronization. A stable line will be classed by the blip logic as a BT IPstream Max line that over the previous 14 days has not had a line rate change that has instigated a downward change in their BRAS profile. Therefore, if a stable line has a single, isolated low synchronization event that instigates a downward change of BRAS profile then as long as the next line rate synchronization event is higher the BRAS will be reset to the appropriate level for this higher line rate within 75 minutes. This bypasses the normal wait for 3 days of a constant higher line rate. If the line rate increases on subsequent synchronization events, further upward BRAS profile changes will also be allowed within 75 minutes as long as there is not another downward move in the BRAS rate in the mean time. If another downward move of BRAS profile does occur within 14 days of the first one then the line will not be classed as stable by the Blip logic and the 3 days of a constant higher line rate will need to elapse before the BRAS profile is changed upwards. Before the line is once again classed as stable by the Blip logic another 14 days will need to elapse during which time the line must not have had a downward move of BRAS profile. Please note that BT systems generate a “heartbeat” synchronization event every night. This will be registered by our systems as standard synchronization event. If the line has a modem or router that is constantly switched on it may prevent the line from synchronizing at a higher line rate before the ‘heartbeat’ event is generated. Therefore, the ‘heartbeat’ event may be detected by the Blip logic as a second low synchronization event and the 3 day rule for changing the BRAS profile will apply."

Copy of briefing from BT Wholesale

So what does it mean for the end-user. This blip logic system should mean that if you you've had the same line speed for 14 days, then experience a single re-sync to a lower line speed and the next re-sync returns you to your normal line speed, that the BRAS Data Rate should reset inside 75 minutes, rather than the three days it takes now. Be aware though that if you have a second re-sync that is a lower speed then the normal 3 day rule for how the BRAS Data Rate changes will apply, i.e. that if you get the higher speed back that the BT systems will want to see three days at the better speed before increasing the BRAS Data Rate again. So a suggestion would be that if an electrical storm is approaching, and you want to ensure your BRAS Data Rate doesn't drop then unplug the ADSL modem. This is on top of the normal advice that to avoid damage to your hardware it is safest to unplug your ADSL modem from the telephone line during an electrical storm.

It should be pointed out, that since this briefing was only recently issued to providers, that the staff on the various help desks will probably not have been briefed on this briefing.


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