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[arronlowley]

i made a post saying my max attenuation had dropped from 85000 to 71000 in one hit, today i did a speedtest and i was back to 80mbps, however... my hg612 reported my max was still only 71000 but i was connected at 80000 and my snr was 3 :S, was this done by dlm? because i reset the modem after and now im back down to 71000 sync with a retrain reason of 2 -_-.
my snr has never been 3 and i thought the only way for it to be 3 is if its set.

ive just remembered, our who area had a massive power cut on Thursday late at night, could this have been the reason?

[AArdvark]

Max Attenuation is a calculated value by the modem. (So I believe)
This has happened to me but not by such a high margin.
The indicator that you need to watch is the snrm which drops to try to maintain the speed you had.
Usually, at some point DLM jumps in to resync the line.
I have dropped to circa 3 but FEC's increased greatly and DLM eventually 'fixed' the problem

[roseway]

I think you both mean Max Attainable, not Max Attenuation. The most likely explanation is that the modem reconnected when the power was restored after the power cut, before other users came online to create a lot of crosstalk. So it connected at the higher speed with an SNRM of 6 dB, but the SNRM then dropped later on as other users came online.

[arronlowley]

my bad i meant max attainable, is retrain reason 2 related to dlm? i still have  g.inp, i thought that when crosstalk affected you that your line attenuation increases but mine hasnt, and bt's speed estimate still says i can get 80, they best change  it because its clearly wrong.

[roseway]

You can see a list of retrain codes here: http://forum.kitz.co.uk/index.php/topic,12504.0.html
You can see that code 2 means that the SNRM dropped below zero.

There's no reason why an increase in crosstalk should increase the reported line attenuation. Both line attenuation and signal attenuation are values calculated by the modem, and we don't really know what the formulae are.

[arronlowley]

ahhh, i got reason 2 when i rebooted the modem

[AArdvark]

I think you both mean Max Attainable, not Max Attenuation. The most likely explanation is that the modem reconnected when the power was restored after the power cut, before other users came online to create a lot of crosstalk. So it connected at the higher speed with an SNRM of 6 dB, but the SNRM then dropped later on as other users came online.

Correct, autocorrect again on a phone.
Must learn to type or stop using a phone to reply. 

[Chrysalis]

yeah and to add to what eric said I imagine the others connected only mere seconds after you so the brief higher snrm was probably not plotted.