ADSL2+ Line Training - Experiences and Advice
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- Re: ADSL2+ Line Training - Experiences and Advice
ADSL2+ Line Training - Experiences and Advice
27-07-2009 10:24 AM
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My ADSL2+ trial started on 23 July 09. With the exception of one small blip on the same day, my modem's sync speed has varied between 15108kbps and 15941kbps. The "blip occurred on the same day as the trial started, and the sync speed then was 14301kbps. Furthermore, the modem seemed quite stable at 15537kbps from around 17:50 on 24 July until 08:45 on 26 July. No drops, no resyncs, and some very decent speeds. In all the above cases the up-speed had only really varied between 1075kbps and 1259kbps. and the Noise Margin (SNR) was around 6 for both up and down.
This morning I woke to find that my modem had resync'd (not my doing, line simply dropped) at 12761kbps. Up speed 1221kbps with a down SNR of 12 and up SNR of 6.
I know this is only about Day 5 of the 10-day training period. I'm not asking anyone to actually DO anything about this.
I did read that sync speeds vary throughout the training period in order for BT to save bandwidth (I think I read that they prefer to set a line at a rate that has the minimum number of dropped packets, or something like that).
My question is this: After the training period, does the line settle at the LOWEST sync speed it attained throughout the training period (I read somewhere that it does), or is there a chance that the sync speed may increase again during the training period?
Additionally, things seemed to be going fine for me while my modem sync'd on the FASTPATH, though during the training period on 24 July the type changed to INTERLEAVE. While I was on ADSLMAX, my line settled on FASTPATH and remained that way with a permanent sync speed of 8192. Is there a chance that the training period will try FASTPATH again?
I repeat, I'm not asking anyone to DO anything about this, I'm just asking for advice. This ADSL2+ stuff is all new to me, and I guess is pretty new to a lot of people.
Thanks in advance,
Steve
Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 10:31 AM
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The training period is designed to establish the best speed at which a stable connection can be achieved. It is also the period in which the MSR (Maximum Stable Rate) and FTR (Fault Threshold Rate) are set. The FTR is the speed at which any sync rate beneath is deemed an FTB (Fault Threshold Breach) fault, which can be raised to BT.
The MSR is set at the low end of the sync events during the training period but this does not mean that the connection speed will always be at that point.
Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 10:48 AM
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After the 10 days the line is still being monitoered and the system will change the SNRM and Interleaving, it can be hours, days or weeks between them depending on the history. I went from interleaved depth of 32 to Fastpath, to interleave depth of 120 to interleave of 16 in a matter of days after being on the trial for 2 months.
Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 11:04 AM
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Quote from: itsme There probably been many examples where Users have keep rebooting their modems/routers trying to get a higher sync speed but instead have cause a higher SNRM and hence reduced the sync speed and FTR.
The thing is, despite reading on a plusnet page . . .
http://www.plus.net/support/broadband/products/faqs_and_guides/dslmax_guide.shtml#Firstdays (Yes, I know that's about DSL MAX)
Quote Whilst the testing is being carried out you should regularly make new connections to the Internet. It's a good idea to power off/on your modem or router when doing this, as this will force your equipment to reconnect.
. . . I haven't been rebooting myself. I only let the line resync when it drops itself. The way I figured it, the BT equipment might think that a manual reboot on my part would indicate a line drop, and consider it an unstable connection. So my modem is on 24/7. Always has been.
Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 11:26 AM
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Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 11:29 AM
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(By the way, James, I've not yet thanked you for all the help you've given me over the trial so far. "Thank you" seems a little inadequate, to be honest! )
Re: ADSL2+ Line Training - Experiences and Advice
27-07-2009 11:31 AM
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I'd just stick to a daily reboot first thing every morning.
Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 9:14 AM
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Not sure how useful these figures would be to you (or to anyone else), but I've attached a PDF of a spreadsheet I've been keeping since the Trial began. It comprises router figures, speed tests from two separate sites, and the occasional speed test from the BT speed tester.
Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 10:32 AM
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However, some people have seen quite big (negative) changes after a month or two of being on ADSL2+, so you can't rely on a stable sync even after your nominal 10-day training period has ended. The DLMs don't always seem to work in the way they're supposed to. But I hope your experience stays good.
Graham
Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 10:43 AM
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One question that DOES come to my mind, though, is that I've seen many posts on here from people on the trial who have suffered drops in sync speed, but I'm wondering if this is a representation of everyone on the trial, or just those who are having problems? I'm wondering of there are others on the trial who have had good speeds and a good experience throughout, who simply see no reason to comment on it because things are going so well for them?
Personally I feel it would be good to get a broader representation of those on the trial, so that things may be identified that WOULD contribute to a lower sync speed, either initially, or after a longer period of time. Line length, atmospheric changes and such can't be the ONLY variables.
Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 4:13 PM
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Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 4:53 PM
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Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 7:24 PM
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Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 7:54 PM
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Re: ADSL2+ Line Training - Experiences and Advice
29-07-2009 8:40 PM
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Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
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- Re: ADSL2+ Line Training - Experiences and Advice