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Standard User Frank873
(newbie) Sun 29-May-11 23:19:21
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Target SNRM, errors and DLM


[link to this post]
 
I have a long, noisy line and struggle to maintain a 1000 kpbs profile. Over the last few weeks my SNRM seems to have been drifting upwards and is now at around 11.5 dB. Today there was a jump from 8.5 to 11.5 and I was wondering if that was the DLM? There was no disconnect - the synch remained at 1152 kbps - the lowest speed for a 1000 kpbs profile. Hopefully, I won't have a disconnection as I suspect I will not be able to synch at 1152 again and with a profile of 1000 you don't want to be losing anything. From what I've read, it seems to be a matter of being patient and hoping that the line/DLM will sort themselves out. Does anyone know how a line is judged to be stable in terms of error counts (CRCs, HECs, FECs) before the target SNRM is dropped??
Standard User RobertoS
(sensei) Sun 29-May-11 23:35:00
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Re: Target SNRM, errors and DLM


[re: Frank873] [link to this post]
 
BT don't publish the error rates that trigger things frown.

Please can you post your line stats from the router? Preferably including the error figures, but certainly the up connection speed, and both up and down attenuations.

Have you been raising issues with your ISP?

From what you say so far, it could even be that something that was disturbing your line has gone away. You haven't had a neighbour just go on holiday have you? Or move out?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
Standard User Frank873
(newbie) Sun 29-May-11 23:42:40
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Re: Target SNRM, errors and DLM


[re: RobertoS] [link to this post]
 
Router is a Speedtouch 585v8. Changed from a Netgear DG834v2 five or so weeks ago.

Here are the numbers:

Uptime: 1 day, 9:17:26
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 672 / 1,184
Bandwidth (Up/Down) [kbps/kbps]: 448 / 1,152
Data Transferred (Sent/Received) [kB/MB]: 0.00 / 275.15
Output Power (Up/Down) [dBm]: 11.5 / 16.0
Line Attenuation (Up/Down) [dB]: 31.5 / 63.5
SN Margin (Up/Down) [dB]: 14.0 / 11.5
Vendor ID (Local/Remote): TMMB / ALCB
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 5 / 1,768
CRC Errors (Up/Down): 5 / 21
HEC Errors (Up/Down): 0 / 54

Haven't spoken to Orange recently.


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Standard User RobertoS
(sensei) Mon 30-May-11 00:04:41
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Re: Target SNRM, errors and DLM


[re: Frank873] [link to this post]
 
On the face of it, my suggestion at the end of my previous post is feasible. Some noise source has ceased.

In your position I would wait until well after sunrise tomorrow and do a re-sync. Before you do that though, have a browse through the BT DLM, IP profile and Noise margin pages on my website, but more importantly, if you already know that stuff, go to the Troubleshooting section and home in on the Ring/bell wire, High SNRM/Margin and Miscellaneous Nasties pages.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
Standard User Frank873
(newbie) Mon 30-May-11 08:55:27
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Re: Target SNRM, errors and DLM


[re: RobertoS] [link to this post]
 
Thanks - I am well acquainted with your site - and very useful it has been too!

Ring/bell wire is removed. I had an NTE5 installed (Openreach) to replace an old style LJU3 to allow easy isolation from internal (cat5e) wiring. I usually don't connect to the master socket directly - tests show some effect from the internal cabling but I haven't yet decided whether to change the modem location. Filters have been replaced recently. I use a DECT phone plugged into an extension socket - when it rings there is a small increase in errors logged by the modem. I haven't managed to figure this one out yet.

My next door neighbours are away but have been so for a few days now and the jump only occurred yesterday - hard to say if there is a link but it is certainly worth remembering. May get resolved when they return!

Will post new data if/when I re-synch - the prospect of dropping to 0.5 Mbps again is painful ....
Standard User Zarjaz
(knowledge is power) Mon 30-May-11 09:37:15
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Re: Target SNRM, errors and DLM


[re: Frank873] [link to this post]
 
when it rings there is a small increase in errors logged by the modem. I haven't managed to figure this one out yet.

Very common, and not a fault as such, if there were many errors associated with phone use, then there might be something to chase.

Standard User Frank873
(newbie) Mon 30-May-11 11:38:37
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Re: Target SNRM, errors and DLM


[re: Zarjaz] [link to this post]
 
Next installment. I had to go out and when I returned the modem had resynched all by itself. Numbers here:

Uptime: 0 days, 0:50:55
DSL Type: G.992.1 annex A
Channel mode: Interleave
Maximum Bandwidth (Up/Down) [kbps/kbps]: 784 / 2,016
Bandwidth (Up/Down) [kbps/kbps]: 448 / 1,856
Data Transferred (Sent/Received) [kB/MB]: 0.00 / 2.31
Output Power (Up/Down) [dBm]: 11.5 / 17.0
Line Attenuation (Up/Down) [dB]: 31.5 / 63.5
SN Margin (Up/Down) [dB]: 17.0 / 8.0
Vendor ID (Local/Remote): TMMB / ALCB
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 4 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 65,540 / 0
FEC Errors (Up/Down): 30 / 3,935
CRC Errors (Up/Down): 31 / 259
HEC Errors (Up/Down): 24 / 801

I have never synched at that speed ever before. Error counts are much higher. Not sure I believe the Error Seconds figure though. Let's hope it stays stable and that the profile ups itself (to 1500?) over the next two or three days.

Thanks everyone.
Standard User RobertoS
(sensei) Mon 30-May-11 12:13:44
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Re: Target SNRM, errors and DLM


[re: Frank873] [link to this post]
 
[hunch]
Please can you post the link to what samknows says about your exchange.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
Standard User Frank873
(newbie) Mon 30-May-11 19:23:08
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Re: Target SNRM, errors and DLM


[re: RobertoS] [link to this post]
 
Samknows link to my exchange
http://www.samknows.com/broadband/exchange/EACOM

There was a further change in the SNRM from 8 to 6 after some three hours from the initial reconnect but no further disconnection. Here is a link to the RouterStats data over the period covered by this post:

http://www.flickr.com/photos/63465996@N05/5777474124...
Standard User RobertoS
(sensei) Mon 30-May-11 19:43:22
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Re: Target SNRM, errors and DLM


[re: Frank873] [link to this post]
 
The exchange doesn't show what I thought it might. So no real idea what is going on.

What sync is it now at? I can't work it out from the RS pic.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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