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Standard User JinxterX2
(experienced) Sat 27-May-06 17:30:17
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Re: ST516v6 SNR Margin Tweaking 101


[re: 7cfm] [link to this post]
 
http://en.wikipedia.org/wiki/Trellis_coded_modulation

The power cut back option doesn't do anything as far as I know.
Standard User JinxterX2
(experienced) Sat 27-May-06 17:41:59
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Re: ST516v6 SNR Margin Tweaking 101


[re: JinxterX2] [link to this post]
 
Oh DMT v7.13 is out btw
Standard User 7cfm
(committed) Sat 27-May-06 17:46:46
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Re: ST516v6 SNR Margin Tweaking 101


[re: JinxterX2] [link to this post]
 
I'm still not sure why you would want to switch trellis off, trawling through the forums, most people who post their router stats seem have it switched on, although I've seen a couple with it off. It therefore appears to be better to leave it on, why you would want it switched off is a bit of a mystery.

I wondered if power cut back might be something to do with allowing the router to reduce the power output, therefore if its unticked it will be permanently be at full signal output - I couldn't think of anything else it might be.


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Standard User 7cfm
(committed) Sat 27-May-06 18:02:34
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Re: ST516v6 SNR Margin Tweaking 101


[re: JinxterX2] [link to this post]
 
Thats the 4th one in 6 days
Standard User JinxterX2
(experienced) Sun 28-May-06 15:36:27
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Re: ST516v6 SNR Margin Tweaking 101


[re: 7cfm] [link to this post]
 
Just discovered if I sync with a 13db margin I get a hugely reduced CRC/HEC error rate, any margin above or below that sends the errors shooting up again, wonder if this means there is a SNR 'sweet spot' for every line? Or maybe it's just a random event, dunno.

Update: bah, was a random event methinks..CRC errors back in force as usual

Edited by JinxterX2 (Sun 28-May-06 17:40:46)

Standard User JinxterX2
(experienced) Tue 30-May-06 18:44:32
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Re: ST516v6 SNR Margin Tweaking 101


[re: JinxterX2] [link to this post]
 
DMT Modem Tool v7.14 is out


DMT v7.14
added: ability to visualize BITSWAPPING during SNR monitoring/observation
fixed: Bug in SNR monitoring (SNR-tones without bits were measured/included in measurement)

Standard User Banger
(knowledge is power) Tue 30-May-06 20:21:09
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Re: ST516v6 SNR Margin Tweaking 101


[re: JinxterX2] [link to this post]
 
Ta...

Tim
Eclipse now ZeN
ST510v4 (4.3.2.6 CU Firmware) on 8 Meg Active
Check my bad boy speeds out on ZeN


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Standard User wolvesmad
(experienced) Tue 30-May-06 23:32:40
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Re: ST516v6 SNR Margin Tweaking 101


[re: Banger] [link to this post]
 
Are you using it on your 510v4 banger?

Might just have to dust mine down if you are haha.

------------------------------------------------
PIPEX

(Xtreme5)

Pipex GO! 2Mb(NDO Speed Test)/(Adsl Guide Speed Test)

Can'tWait4MaxDSL!!

Local Line Atten(dB):46 Local SNR Margin(dB):22
------------------------------------------------


Standard User Banger
(knowledge is power) Wed 31-May-06 00:38:28
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Re: ST516v6 SNR Margin Tweaking 101


[re: wolvesmad] [link to this post]
 
I am indeed, the auto SNR monitor is particularly useful

Tim
Eclipse now ZeN
ST510v4 (4.3.2.6 CU Firmware) on 8 Meg Active
Check my bad boy speeds out on ZeN


Sign up for Latency Monitoring
Standard User wolvesmad
(experienced) Wed 31-May-06 09:08:52
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Re: ST516v6 SNR Margin Tweaking 101


[re: Banger] [link to this post]
 
How does it perfrom banger?

I lose about 4-5db SNR if I drop from my DG834PN to ST510v4............which leaves it at about 18db.

Is it worth me upgrading to the 3.x.x. software or can I leave it at 2.7?

I'm running DMT Tool 7.14 and it won't draw the graphs for SNR Noise & Bit Loading Values:(

Where can I get 7.09 from?

------------------------------------------------
PIPEX

(Xtreme5)

Pipex GO! 2Mb(NDO Speed Test)/(Adsl Guide Speed Test)

Can'tWait4MaxDSL!!

Local Line Atten(dB):46 Local SNR Margin(dB):22
------------------------------------------------


Edited by wolvesmad (Wed 31-May-06 09:40:57)

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