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Standard User 4M2
(fountain of knowledge) Tue 12-Feb-13 16:42:29
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
You still may be losing up to 2400Kbps due to the 12dB downstream SNRM...
Standard User matthewcl375
(regular) Tue 12-Feb-13 17:17:32
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: 4M2] [link to this post]
 
Yeah, but DLM should re-sync again in 10 days time bringing the SNR down by another 3db until it reaches the optimal speed.

My question was, does the sync rate I'm now getting look reasonable for a 3db drop in Target SNR Margin?

And what of those errors?
Standard User 4M2
(fountain of knowledge) Tue 12-Feb-13 17:51:32
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
With a 15dB SNRM sync was 4672Kbps and now with a 12dB SNRM sync is 5792Kbps so that means for a 3dB change in SNRM you have gained 1120Kbps - this is roughly consistent with ~1200Kbps for each 3dB of SNRM on your line.

So with a 6dB downstream attenuation and a 6dB SNRM a sync speed of 8128Kbps can be achieved, however because it seems that for each additional 3dB of SNRM, over 6dB, you may be losing ~1200Kbps, hence for a 12dB sync time SNRM your current sync speed of 5792Kbps looks about right.

Errors don't look to bad after a resync - keep an eye on them...


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Standard User XRaySpeX
(eat-sleep-adslguide) Tue 12-Feb-13 18:01:13
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
Not much of a gain. Best you are going to get @ 6 dB NM is 7 Meg, 1 Meg shy of what you should.

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 19 Meg WBC
Standard User XRaySpeX
(eat-sleep-adslguide) Tue 12-Feb-13 18:08:13
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: 4M2] [link to this post]
 
The problem with that is that on such of short line he should have loads of spare NM when syncing at 8 Meg G.DMT. Points to a wiring issue.

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 19 Meg WBC
Standard User 4M2
(fountain of knowledge) Tue 12-Feb-13 18:25:11
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: XRaySpeX] [link to this post]
 
In reply to a post by XRaySpeX:
The problem with that is that on such of short line he should have loads of spare NM when syncing at 8 Meg G.DMT. Points to a wiring issue.


Yes, I agree.
Standard User matthewcl375
(regular) Tue 12-Feb-13 18:28:24
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: XRaySpeX] [link to this post]
 
Or it could just be that at the time the router chose to re-sync this morning there was higher noise, and if I re-synced at a different time of day I may get higher maybe?

I can't see there being much of a wiring issue, due to the fact that the open reach engineer installed a brand new line for us, and we're currently plugged in to the test socket too crazy

@XRaySpeX How did you work out I'm only going to get 7Mbps at 6db? Going by what 4M2 said I should be able to reach the max of 8128Kbps ?

Edited by matthewcl375 (Tue 12-Feb-13 18:32:59)

Standard User 4M2
(fountain of knowledge) Tue 12-Feb-13 18:42:17
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
Yes, but on a good line with a 6dB attenuation 8128Kbps is easily achievable with a 9dB SNRM.
Standard User matthewcl375
(regular) Tue 12-Feb-13 19:14:52
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: 4M2] [link to this post]
 
Hmmmmmmmm.. only thing I can think is the time at which the router re-synced, any other ideas apart from that as to why that would be? Would it be worth re-syncing at a different time?

BTW: My SNR Margin has been at a steady 12.3 all day so far

Edited by matthewcl375 (Tue 12-Feb-13 19:18:05)

Standard User 4M2
(fountain of knowledge) Tue 12-Feb-13 19:30:20
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Re: Slow Internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
In reply to a post by matthewcl375:
Hmmmmmmmm.. only thing I can think is the time at which the router re-synced, any other ideas apart from that as to why that would be? Would it be worth re-syncing at a different time?

BTW: My SNR Margin has been at a steady 12.3 all day so far


You currently have the router plugged in the test socket with perhaps only one corded phone in use via a dangle filter?

Have you tried another router, adsl lead and dangle filter in the test socket? If you have, or find that sync speed hasn't improved if you do, then it's likely that there is noise affecting the line exchange side of the master NTE5.
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