Can sync stick?

[#1]

Hi,
Posted last week about stuck SNR/update to adsl2. Matt got a request put in to reset - it didn't seem to work. I since borrowed a billion router which connected with adsl2+ and had 6db snr.
So I've gone back to my speedtouch 585v7 and using the CLI I've managed to get it to connect with adsl2 (before it seemed to only want to connect with g.lite).
The problem is now my sync is quite low for my current stats - and it never changes no matter how many times I reconnect, it's always showing 3068kbps.
My current stats are:-
Link Information
Uptime: 0 days, 0:01:17
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,060 / 3,068
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 33.5 / 50.5
SN Margin (Up/Down) [dB]: 6.0 / 7.5
Vendor ID (Local/Remote): TMMB / IFTN
I've been reconnecting a few times (disconnecting each time so the exchange doesn't think there's a drop in the line). But it seems to hold sync just fine with this SNRM.
50.5db attenuation w/ 7.5db SN margin shouldn't equal 3,068 kbps sync - shouldn't it be in the region of 4-5meg? Can this get stuck somehow? Is it something to do with the SNR reset/training?
Thanks in advance

[#2]

It's not really stuck, but it looks like the DLM has put you on a 1472-3072kbps banded profile, probably because of the number of disconnections it is seeing. This is an attempt to stop your connection dropping, but the maximum sync speed you will see is just under 3072kbps, as yours is.
If you leave the connection alone for some days - leave the router on 24x7 - the DLM might remove the banding after a week or perhaps longer if the connection remains solid.
Alternatively the Digital Care Team might be able to get the banding removed on Friday, but you must not disconnect or almost certainly the DLM will apply it again.
The connection setting in the router should be multimode (all the options added together). If it will only connect using G-lite I'd be tempted to put that down to a line, filter or router fault. Does that happen if you connect through a filter into the Test socket?

[#3]

The other router connected fine with adsl2+. I think it could be the firmware I'm using, in the gui it doesn't even give an option to choose the type of connection. I used an older version that stops a bug connecting to microsoft vpns. It seems to work fine forcing it to adsl2 - and I've had sync for a few days @ low snr no problem.
I'm connected into the back of the socket via a filter - I just took the faceplate off after all the problems I've had lately
I might see if a nice person in the DCT can do something then. 

[#4]

Hi there,
We'd need to see a more solid connection before we could perform an SNR reset or anything like that really. It's been up 19hours at present. I'd advise prompting us for a check on this on Monday. If the line has not remained stable I'll make sure we look at any other factors that could be causing intermitency for you.

[#5]

Uptime: 4 days, 3:00:46
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,060 / 3,068
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 33.5 / 50.5
SN Margin (Up/Down) [dB]: 6.0 / 6.5
CRC Errors (Up/Down): NA / 216
Been up over 4 days now - what can be done about sorting the sync out?

[#6]

Hi there,
You've not quite had 4 days yet I'm afraid which would be the key to that improving:
<img src="http://ccgi.psmith12.plus.com/visradius/generated/image13152249939687.png" />
However if it has been 72 hours and the sync speed does not improve give me a shout again.
Adam

[#7]

Hmm is my router telling porkies then?
Reckons 4days 19hrs and no loss of signal. It's a Speedtouch 585v7. I had matt telling me it had resync'd twice after a SNR reset a few weeks ago too - but the router seemed to think otherwise.
These are my current stats:-
Uptime: 4 days, 19:05:10
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,060 / 3,068
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 33.5 / 50.5
SN Margin (Up/Down) [dB]: 6.0 / 6.0
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0

[#8]

It's possible the PPP connection to Plusnet is being disconnected/reconnected (which shows on that Plusnet graph), but sync with the exchange ("uptime") is not lost.
Does the router's Event Log here show a PPP disconnection around 12:30pm today?

[#9]

Right... Yep
Connection Information
Type: PPPoA
Uptime: 0 days, 2:43:04
So why would the ppp connection drop and that shouldn't affect how the dlm negotiates my link should it?

[#10]

Apart from deliberate user disconnect/reconnect action via the router's web interface, Plusnet Current line speed changes would cause a PPP drop to change your service profile but that should not apply in your case. As far as I know anything else implies a service anomaly.
In any case I wouldn't expect this to affect the DLM's view of line performance.
However based on the stats you posted I doubt resetting the connection would give any benefit. It looks like downstream line noise could be excessive. Have you checked your stats when plugged into the test socket?

[#11]

It's not had constant connection though I'm afraid which is what counts. I think your router stats are showing signal uptime rather than connected sessions. I've taken the logs I posted from our RADIUS connection database so its a waiting game at present. I suggest we keep an eye on this for the next couple of days.

[#12]

Just to follow up on this, my line resynced on its own last night and got this:-
Uptime: 0 days, 18:24:21
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,059 / 4,459
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 33.5 / 50.0
SN Margin (Up/Down) [dB]: 6.0 / 5.5
Vendor ID (Local/Remote): TMMB / IFTN
My profile is already up to 3.5meg so much better