MSR & FTR question?

Hi All

Right, please put my mind at rest? Just what is the MSR & FTR based on and set from?

Is it calculated from the max maintained sync speed during the 10 day training period (original or a full reset/retrain at any time)?

Or more simply calculated from the attenuation figure i.e. the line length?

I thought it was based on the sync speed in the (re)training period but I have now been told it is based on line length hence the need for a little unbiased feedback.

TIA for the insight and also any links to pages that give & explain the details

Is it calculated from the max maintained sync speed during the 10 day training period (original or a full reset/retrain at any time)?

Not the maximum sync speed that has been achieved, but a speed that the DLM has decided is the maximum stable speed.
The FTR is calculated as 70% of the determined MSR.

Have a look here.

In reply to a post by panda:

Is it calculated from the max maintained sync speed during the 10 day training period (original or a full reset/retrain at any time)?

Not the maximum sync speed that has been achieved, but a speed that the DLM has decided is the maximum stable speed.
The FTR is calculated as 70% of the determined MSR.

Have a look here.

Hi Panda

Thanks for the feedback and linky I will check that out soon.

For the record my MSR 2272 & FTR is 1817

I am now sync'ed at 3712 but this because of long term 'arguments' about my line with the ISP is now back to what I used to enjoy when I first got MaxDSL in March 2006 at a speed >3500 until March 2008 when the speed approx halved......long story short now back to 3712.

What the ISP seem unwilling or unable to answer is what speed the MSR & FTR are actually based on i.e. what they tell me not what I calculate??? The last 'note' was to tell me they were based on my line length and nothing to do with sync speed! Hence my question.

Edit - in principle if the 3712 is "stable" for 10 days + then I should ask for a retrain as that "should" lift the MSR (& FTR) to a more logically linked figure i.e. not 3712 but a heck of a lot nearer to it e.g. 3000 ?

Edited by deleted (Sat 07-Aug-10 13:20:11)

Good luck, but from I've read it seems BT can just turn around and say "tough that's what your line can (now) support"!

When you see what they say is 'acceptable' in their speedtester results it gives a clue to how they work

If anyone knows different I'd be interested to hear.

In reply to a post by b4dger:

Good luck, but from I've read it seems BT can just turn around and say "tough that's what your line can (now) support"!

When you see what they say is 'acceptable' in their speedtester results it gives a clue to how they work

If anyone knows different I'd be interested to hear.

Sadly you are likely correct but heh unless you ask you never know We shall see how "stable" the connection is over the next few days & I will pose the question about a retrain with the caveat question about the MSR & FTR being reset/reconfigured??? And if not why not???

As for the "support" guy saying the MSR &FTR is nothing to do with sync speed but line length I suppose in technical regard he is correct but the accuracy of his 'statement' leaves a lot to be desired!!!! Afteral line length will dictate the margin that yields a stable connection sync speed that thus results in the MSR.......but to state it is the line length not the sync speed is surely stretching 'the truth' of the matter?

the MSR of 2272 would be based on the lowest speed during the training period, 2272 is also the default so it may not have been updated or it may be a coincidence.

In reply to a post by Routefinder:

I will pose the question about a retrain with the caveat question about the MSR & FTR being reset/reconfigured??? And if not why not???

As for the "support" guy saying the MSR &FTR is nothing to do with sync speed but line length I suppose in technical regard he is correct but the accuracy of his 'statement' leaves a lot to be desired!!!! Afteral line length will dictate the margin that yields a stable connection sync speed that thus results in the MSR.......but to state it is the line length not the sync speed is surely stretching 'the truth' of the matter?

A retrain will reset the MSR & FTR values.

Both of those values are calculated from DLM info and related to sync. Line length & quality will determin sync speed as you know.

Its worth pointing out that MSR and FTR on there own are usless markers. There is no obligation to act on a fault where the FTR has been breached. A look on the BT Speedtester will give you a clue as to what is an acceptable connection.

There is no obligation to act on a fault where the FTR has been breached.

but you can at least report the sync speed as a fault if the fTR is breached.

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