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Standard User steadyeddie
(member) Mon 17-Oct-11 11:24:43
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Target SNR


[link to this post]
 
Hi
Is there any chance one of the Plusnet guys could have a look at ticket 47753440 please.
Basically my trusty old Netgear router went kaput yesterday and in the process of replacing it my Target SNR jumped up from a very reliable 6 to 12, probably due to all the disconnections whilst getting the new router up and running.
In the reply to my ticket, i've been asked to raise a speed fault, going through numerous checks, tests, questions etc.
Just wandering if that's all necessary, just need the SNR bringing down to 6 soon as, rather than waiting for an eternity for BT's [censored] old 20cn network to catch up.
Thanks
Jeff
Standard User adslmax
(fountain of knowledge) Mon 17-Oct-11 12:38:49
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Re: Target SNR


[re: steadyeddie] [link to this post]
 
There is no point really, because reduce from 12dB to 6dB had to be very good line with less errors and had to be stable. Look like your exchange decided 12dB is the best target for your line. I had asked Plusnet to reduce back to 6dB when I use to have stable at 6dB for months, but they told me it had to deal within the fault team, as it had to raised a fault ticket. The fault team look into it, found no fault and agree to reduce to 6dB but only a matter of time later, the exchange return to 12dB itself. So, we had to accepted what the exchange want, not you. I know it total unfair play by BT. That's BT for you.

plusnetADSL2+14 Meg
Standard User m0aur
(member) Mon 17-Oct-11 16:37:32
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Re: Target SNR


[re: adslmax] [link to this post]
 
Been with Plusnet a couple of months. Very good speed and snr to start with. I was syncing at 15 plus mb and getting 13 down. One little bit of file sharing and PN soon put paid to that. i have had a month of syncing at 11+mb and getting 8.5 to 9 down due to a line profile of 10500. Restarts every few days with several routers made no difference.
Took delivery of a Billion BiPAK 7800N today and immideately hooked into my exchange at 13+mb, and after forcing my snr down to 4.5 am now connecting at 14751 with the 10500 profile. I will see what happens over the next few days before deciding to stay or not.
Edit:- Exactly 8 hours on from installing the Billion I now have an IP profile of 13013 for a DSL connection rate of 14750. looks like we are on the mend. Well done Billion!

Edited by m0aur (Mon 17-Oct-11 21:13:26)


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Standard User XRaySpeX
(knowledge is power) Mon 17-Oct-11 17:14:23
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Re: Target SNR


[re: adslmax] [link to this post]
 
In reply to a post by adslmax:
only a matter of time later, the exchange return to 12dB itself. So, we had to accepted what the exchange want, not you.
No, you don't if you get a router, like Netgear DG834GT, where you can tweak the Target NM yourself.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 17 Meg Untweaked 19 Meg Tweaked WBC
Standard User adslmax
(fountain of knowledge) Mon 17-Oct-11 18:00:21
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Re: Target SNR


[re: XRaySpeX] [link to this post]
 
I had a Netgear DG834N but I do believed BT exchanges on those on ADSL2+ had blocked snr tweaking, it won't work.

If you notice the DMT Tool, if you leave it at the default snr 12dB and RCO at 98% but if you do tweak snr down to 6dB and the RCO will drop to 85% mean the true line speed throughput will be reduced even with the higher sync rate but you won't getting anywhere at 98% RCO true speed.

plusnetADSL2+14 Meg

Edited by adslmax (Mon 17-Oct-11 18:15:23)

Administrator MrSaffron
(staff) Mon 17-Oct-11 19:12:27
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Re: Target SNR


[re: adslmax] [link to this post]
 
In there case if the issue was just due to a shortish period of instabilty where the route cause has been fixed, then no harm in lowering it.

The exchange only returns it to a higher value if the line history shows the frequent disconnects, if they have stopped then 6dB can be held.

Some ISP's it is easier to get done than others.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User adslmax
(fountain of knowledge) Mon 17-Oct-11 19:18:22
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Re: Target SNR


[re: MrSaffron] [link to this post]
 
Mine is comfortable sitting at 3dB snr for a month now, sync rate 16978K at 33dB line attenuation with the new ip profile rate of 14979K and got throughput speed of 14458K and quite happy with it. I did ask my isp Plusnet to reduce from 12dB to 3dB and had accepted.

plusnetADSL2+14 Meg

Edited by adslmax (Mon 17-Oct-11 19:20:43)

Standard User m0aur
(member) Tue 18-Oct-11 09:39:40
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Re: Target SNR


[re: m0aur] [link to this post]
 
What a difference 20 hours make with a decent router.
Before Billion. http://speedtest.net/result/1540456327.png
After Billion. http://speedtest.net/result/1541226940.png
Now syncing even faster at 14627, so should soon be up to 13M down again. It just goes to show how easy it is to rubbish an ISP when we are running iffy gear.

Edited by m0aur (Tue 18-Oct-11 09:44:36)

Standard User adslmax
(fountain of knowledge) Tue 18-Oct-11 13:00:09
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Re: Target SNR


[re: m0aur] [link to this post]
 
My Netgear DG834N is now steady at 1.4dB snr for 25 hours ongoing and the sync rate had rise to 17819k with ip profile @ 15721k and throughput speed of 15178k. Pretty good for my downstream line attenuation after manage to tweak lower snr from the dmt tool.

http://www.speedtest.net/result/1541499800.png 15.17Meg smile

plusnetADSL2+14 Meg

Edited by adslmax (Tue 18-Oct-11 13:03:33)

Standard User m0aur
(member) Thu 20-Oct-11 21:03:18
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Re: Target SNR


[re: adslmax] [link to this post]
 
My Billion has stayed at the same sync and stable down to 2.9db in the evenings, but that did not stop PN dropping my speed down to 8500 after 24 hours despite my high IP Profile. I have requested they nail my snr to 3db, but I am losing patience.

Edited by m0aur (Thu 20-Oct-11 21:03:53)

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