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Fibre - upstream speed drop

Community Veteran
Posts: 6,313
Thanks: 86
Fixes: 3
Registered: 08-01-2008

Fibre - upstream speed drop

My upstream sync speed has 'plummeted' to exactly 17000 kbit/s, this has always previously been the full 20Mb.  Cheesy
It looks like my upstream has been put on a banded profile as my modem/router is showing Send direction Max. DSLAM throughput 17000 (and Min. 8000).
I'll apologise right now to everyone who'd be happy enough with 1/20th of this upstream as I don't want you to think I'm moaning about 'only' getting 17000 upstream or complaining that it's actually affecting my internet in any way - the question is simply does this indicate a potential line fault?  Having had 20Mb for around a couple of years and always having had an attainable upstream well in excess of 20Mb/s (has been over 30Mb/s, currently still showing over 25Mb/s) it seems odd that the DSLAM has decided to act in such a sudden manner unless something on the line has changed.
Is there any point in raising a fault or should I leave it a while to see what happens?
Call me 'w23'
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
2 REPLIES
Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: 18-07-2007

Re: Fibre - upstream speed drop

Hi w23,
Looks like it's been done by the DLM system, though I'd guess more for errors seen than drops as there's only a couple showing on your connection log:
<img src="http://community.plus.net/visualradius/generated/image13898868885074.png"/>

Though it's possible it could have happened as a result of one of those in the early morning. I'm afraid I'd not recommend raising a fault though as that kind of drop wouldn't be seen as a fault by our suppliers and the upstream is still working at a very good speed. Hopefully it'll stay stable (possibly even improve) and the profile will be updated accordingly.
Community Veteran
Posts: 6,313
Thanks: 86
Fixes: 3
Registered: 08-01-2008

Re: Fibre - upstream speed drop

Thanks Matt, stability is not an issue, and performance is best described as 'perfectly adequate', only my monitoring stats show anything amiss to be honest.
I guess there may be increased noise on the line so DLM has capped things to limit errors (still getting a few - 0.06 average CRC per minute since syncing at 17000 some 16 hours ago).
I'll just monitor to see if things deteriorate (or, indeed, improve) Smiley
Call me 'w23'
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.