Still getting the odd re-sync

Steve · Jan 19, 2010, 14:47:19

I've heard of people double filtering the sky box

PuncH · Jan 19, 2010, 14:56:14

Yeah I have too, but if it's causing the problem I'll just leave it unplugged. I'm getting rid of Sky soon anyway!

Rik · Jan 19, 2010, 15:51:11

The Sky box would feature high up on my list of suspects, Jonathan.

PuncH · Jan 19, 2010, 18:06:21

444 CRC's in 10 hours and 2 errored seconds.

Does that sound better??

Steve · Jan 19, 2010, 18:08:05

Its a lot better than you the ones you posted earlier.

PuncH · Jan 19, 2010, 18:44:18

Aye...hopefully it's not enough to trigger a re-sync tomorrow morning.

PuncH · Jan 20, 2010, 15:33:27

Well...no re-sync today. The connection has been up for well over 24 hours, so moving to the test socket and removing the sky+ box has worked, or...my line is now at a speed it can handle assuming it may have degraded rather rapidly.

Anyway, after a few days of stabilty I'm hoping the DLM will up the speed again and then we'll see what happens. If it stays stable then it'll be the sky+ box or the faceplate. If it doesn't I'll have to look at the router, or my line has now gone to poop.

Rik · Jan 20, 2010, 15:36:54

My line has, Jonathan.

PuncH · Jan 20, 2010, 15:38:55

You don't think there are some wrong doings by BT do you Rik? I've read about them deliberately throttling peoples connections. Mind you, with yours there wasn't a lot to throttle was there!?

Rik · Jan 20, 2010, 15:40:37

No, there wasn't. I had a line card fault over the Xmas period, since the repair I've lost just under 1M in speed. I've tried a different router and it's in the master socket, no extensions attached.

Steve · Jan 20, 2010, 17:27:25

With regard to BT throttles I think I've posted these before
WBC banded line profile (rate kbps)
7168 - 14336
4864 - 9728
3328 - 6656
2272 - 4544
1472 - 3072
1152 - 2272
576 - 1152
288 - 576
160 - 288

So the DLM specifies a minimum and maximum sync rate for your line. BT's excuse is to give you a stable connection with minimum resyncs. I assume you know you've been banded if your downstream noise margin is excessively high.

Rik · Jan 20, 2010, 17:33:18

Mine has gone from 6-12db since BT changed the line card, Steve, but I'm assured I have a target of 6db and I'm not banded.

Steve · Jan 20, 2010, 17:39:29

Would banding perhaps be used on lines with lower downstream attenuation than yours but performing poorly on ADSL2+. What I don't understand is downstream margins in excess of say 20 and a lot lower sync than I would expect.

Rik · Jan 20, 2010, 17:40:47

Quite possibly. ADSL2+ seems much more error concious than ADSL1.

Steve · Jan 20, 2010, 17:43:28

I looked at my modem stats last night ok its only 60 hours at present but not a single CRC , you won't get that with ADSL2+.

Rik · Jan 20, 2010, 17:52:59

I don't.

PuncH · Jan 20, 2010, 22:51:20

Quote from: Steve on Jan 20, 2010, 17:27:25
With regard to BT throttles I think I've posted these before
WBC banded line profile (rate kbps)
7168 - 14336
4864 - 9728
3328 - 6656
2272 - 4544
1472 - 3072
1152 - 2272
576 - 1152
288 - 576
160 - 288

So the DLM specifies a minimum and maximum sync rate for your line. BT's excuse is to give you a stable connection with minimum resyncs. I assume you know you've been banded if your downstream noise margin is excessively high.

I'm in the 3328 - 6656 band at the moment, with a margin of 30!

Certainly room for improvement, especially as my error count is still at 444 CRC's and 2 Errored seconds!

Steve · Jan 21, 2010, 07:27:34

So the question I ask myself is what is stopping the modem syncing at a higher rate? It looks like you now have a stable connection with low error rates and you appear to have possibly found the source of some of your interference on your internal wiring.

PuncH · Jan 21, 2010, 07:34:30

Just waiting for the DLM to up my sync rate again, which it'll hopefully do in a few days. Then I've got to hope it remains stable

Steve · Jan 21, 2010, 07:48:18

But will the DLM raise your sync speed without BT/ISP intervention? If we look back at adslmax the only control of sync rate was through target SNR margin and the max was 15 with ADSL2+ something else is happening I think?

PuncH · Jan 21, 2010, 10:31:07

Yep...support say DLM will raise my sync speed automatically, but it could take up to 14 days. Then it's a case of wait and see.

PuncH · Jan 25, 2010, 10:46:02

Still waiting for DLM to do it's stuff and unband my connection. Nearly 6 days now of solid sync at 5200kbps since I moved onto the test socket.

PuncH · Jan 31, 2010, 10:54:15

Update:

DLM kicked in this morning. Sync is up to 16122kbps. Line is no longer on the test socket either, just straight into the mastersocket minus the sky+ box. There are a few errors, but nothing major at the moment.

Now the fun begins!

Steve · Jan 31, 2010, 10:57:26