Rather than read all the threads, here is a final summary.

My line kept losing sync, and subsequently I got 'capped' at a lower and lower sync rate/high SNRM. This started around Sept./Oct. last year.

After a lot of messing about, including buying a new modem/router my ISP (Enta) called out an engineer.

He found my line was bad, and ended up swapping the pair of wires from the box in the street to my faceplate - this sorted the problem - I now have a solid connection and good speed.

I was sync's at around 9600 for 48 hours but SNRM was between 6 down to 0.2! The line dropped and I resync'ed at 8400 with SNRM of 8 down to 6 This seems rock solid now.

Here is the latest noise stats polled from 11:45 1 Mar. to 09:30 2 Mar. In the chart I have added 3 'spikes' - these indicate the times of a) Sunset, b) Midnight, c) Sunrise.

www.linicks.net/stuff/noise.png

Nick

I don't know, as it sync'ed around 11:30 in the morning when my SNRM was around 6. It was almost 48 hours since connection was up after line repair, so I do think it was the hardware sorting out the negotiation to bring the SNRM up so I don't drop below 6dB now.

Nick

That looks about right for the SNR graph - around 2dB swing from daylight to overnight, a lot of lines will actually have more than that.

Spoke too soon Just had another re-sync - funnily enough around the same time as yesterday. I switched back to ADSL2 only now:

Line Status:Connected
DSL Modulation Type:ADSL_G.dmt.bis
Annex Type:Annex A
 	              Upstream	Downstream
Current Rate (Kbps)	1043	6751
Max Rate (Kbps)	        1040	7328
SNR Margin (dB)	        5.6	11.7
Line Attenuation (dB)	22.2	39
Errors (Pkts)	        0	0

Still, I am still happy with the speed etc. Lets hope it is more stable now.

Nick

Funny it's re-syncing twice round midday. Would expect it more at night.

In reply to a post by Lethe:

Spoke too soon Just had another re-sync - funnily enough around the same time as yesterday.

Did you happen to notice what the sync time downstream SNRM was?

No, I wasn't monitoring - but I am not too worried, as it is still the best connection I have had on this line.

Anyway, I will leave things as they are for a few days, then I will revert back to my Cisco 850 modem/router now I now it wasn't that causing the issue.

Nick

Hopefully your current ADSL2 connection will hold with a downstream SNRM of ~12dB

I give up

So since engineer visit wednesday, I got disconnected:

Thursday NONE
Friday @ 11:45(ish)
Saturday @ 11:30(ish)
Sunday @ 10:20(ish)
Today (Monday) @ 06:30(ish)

I am back on banded profile (4mb). So I switched back to my Cisco 857 (as it wasn't that causing the issues). Here is my latest stats since 8:33 this morning:

Modem Status:	 Showtime (DMTDSL_SHOWTIME)
DSL Mode:	 ITU G.992.5 (ADSL2+) Annex A
~
Capacity Used:	 46%				 100%
Noise Margin:	 13.5 dB			  6.0 dB
Output Power:	 19.5 dBm			 12.5 dBm
Attenuation:	 38.0 dB			 20.0 dB
~
 		 DS Channel1	  DS Channel0	US Channel1	  US Channel0
Speed (kbps):	          0	        4544	         0	        1184
Cells:		          0	     3293079	         0	    75847772
Reed-Solomon EC:          0	           0	         0	           0
CRC Errors:	          0	         158	         0	           0
Header Errors:	          0	          61	         0	           0

Am I correct that the 'banded profile' gets automatically removed if I stay in sync for 3 days?

Nick

Edited by deleted (Mon 04-Mar-13 16:23:45)

Don't give up! Probably best to chase it up again with your ISP and check out what's going on...

Dropped connections, currently downstream SNRM 13.5dB, 4544Kbps sync, 38db attenuation on G.992.5 (ADSL2+) Annex A - it ain�t looking good