Excellent support again

Bill · Oct 30, 2009, 11:56:52

Well, after almost exactly 48 hours (suspicious in itself) of rock steady sync it's shoved me straight back up to a 12db margin

Email has been sent to support....

Rik · Oct 30, 2009, 12:07:12

BT's DLM acts like that if it thinks the line unstable, Bill.

Bill · Oct 30, 2009, 12:41:44

Agreed, but if it defines unstable as one resync in 48 hours then it needs a new dictionary...

I think it just as likely that the MSAN decided, for some reason, to simply change my targt SNRM, which seems to force a re-sync from the exchange end. It's what happened the first time it went to 12db from 9db, then the forced change back to 6db, then the latest to 12db again.

In each (unforced) case there was no obvious reason from my end for a resync to occur, the line had been rock steady

And that 48 hour period, to within a minute, is a bit much of a coincidence imo.

Rik · Oct 30, 2009, 12:46:49

It also looks at the error count, Bill.

Bill · Oct 30, 2009, 13:04:12

Agreed, but something has changed... why did it go straight from 6db to 12db, when previously it had sat happily at 9db for months on end, even maintaining speed over the occasional resync (some auto, some manual) and a 9-digit FEC count that actually rolled over?

(HEC errors were near zero and even CRC errors weren't high.)

Rhetorical question, btw

My own opinion (tfh firmly in position) is that BT have found a sneaky way to reduce the bandwidth they have to supply...

Rik · Oct 30, 2009, 13:06:44

Once a higher target NM has been used, Bill, it seems to go straight to it if it deems it necessary. However, BT are testing new DLM software, and I'm on it. It allows my line to sync at 3db, with the extra speed that goes with that. IDNet can also make subtle stability changes which don't have such a big impact, so a word might help.

Bill · Oct 30, 2009, 14:14:42

Had a word with Simon via email and it seems that, as you thought, the MSAN isn't happy with my error rate... damned thing, it wasn't bothering me

So now it's daily noting of the error counts as I make one change at a time to see if I can reduce them... hours of endless fun

Rik · Oct 30, 2009, 15:23:10

Remember, Max was even more painful when it launched...

Sebby · Oct 30, 2009, 17:33:49

Some may say it was painful to the max...

Rik · Oct 30, 2009, 18:08:55

And they'd be right.

JohnH · Oct 31, 2009, 13:30:59

Quote from: Rik on Oct 30, 2009, 13:06:44
However, BT are testing new DLM software, and I'm on it. It allows my line to sync at 3db, with the extra speed that goes with that.

Are they just testing in certain areas, Rik?

John

Rik · Oct 31, 2009, 13:32:27

It appears so. I'm in the lucky area, possibly because it's based on the MK node?

Glenn · Oct 31, 2009, 13:34:00

And I believe at your local exchange too, how much have you paid them?

Rik · Oct 31, 2009, 16:08:51

An email to Ian Livingstone.