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Standard User KevG123
(learned) Thu 23-Jun-11 23:36:30
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Not bad for 78.5db att


[link to this post]
 
Was down to a 750K profile after line repaired/swapped a couple of months ago

Looks like the 2 wire has done me proud again and squeezed that bit extra out again







My Broadband Speed Test
Standard User Zadeks
(member) Thu 23-Jun-11 23:55:29
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Re: Not bad for 78.5db att


[re: KevG123] [link to this post]
 
ADSL Link Downstream Upstream
Connection Speed 1738 kbps 491 kbps
Line Attenuation 71.0 db 44.1 db
Noise Margin 4.4 db 2.2 db

I guess I should be grateful!

FTTC soon... smile
Standard User KevG123
(learned) Fri 24-Jun-11 12:33:48
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Re: Not bad for 78.5db att


[re: Zadeks] [link to this post]
 
Nice One

If I could just get my SNR below 6db...


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Standard User shtu
(experienced) Fri 24-Jun-11 23:44:58
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Re: Not bad for 78.5db att


[re: KevG123] [link to this post]
 
You'll never persuade the exchange kit or an ISP to do that for you at that line length, you need to force it from your end.

I'm about to have a play with this myself, now I have a router that responds to DMT,

http://forums.thinkbroadband.com/bt/f/4014549-cli-ca...

(currently 1728 sync on an estimated 71dB line, and holding on fine, now at 5.5dB margin in darkness)
Standard User KevG123
(learned) Sat 25-Jun-11 10:41:33
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Re: Not bad for 78.5db att


[re: shtu] [link to this post]
 
ummm interesting

thanks for the link

Might give that a go
Standard User shtu
(experienced) Sun 26-Jun-11 14:32:42
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Re: Not bad for 78.5db att


[re: KevG123] [link to this post]
 
Post your detailed line stats and we'll have a look.

It may be that if you tweaked down to 3dB to get a higher profile you wind up with so may errors and retries that you end up with no actual improvement in throughput.
Standard User yarwell
(sensei) Sun 26-Jun-11 15:48:57
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Re: Not bad for 78.5db att


[re: shtu] [link to this post]
 
when I've used the BT 3dB profile option (shock horror) we didn't have issues with reliability. After all, 0 dB is defined as a pretty low error level so if attenuation is the sole problem (rather than lots of variable noise) it should be happy at 3 dB.

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
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Anonymous
(Unregistered)Sun 26-Jun-11 16:05:47
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Re: Not bad for 78.5db att


[re: yarwell] [link to this post]
 
Have FTTC now but I used to run my 63dB attn line at 3dB with no great problem - it would keep sync for months. FEC kept actual packet loss at 0.02-0.03%. The line didn't really "loose it" in terms of packet loss until the SNRM hit <1.5dB

The error rate was pretty high though!
Standard User KevG123
(learned) Mon 27-Jun-11 23:04:38
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Re: Not bad for 78.5db att


[re: shtu] [link to this post]
 
Down Up
Rate: 1184 kbs 448 kbs
Max Rate: 928kbs 448kbs
Noise Margin: 6.0 dB 11.0 dB
Attenuation: 63.0 dB 31.5 dB
Output Power: 15.5 dBm 11.9 dBm
Standard User mr_bean
(regular) Mon 27-Jun-11 23:52:28
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Re: Not bad for 78.5db att


[re: KevG123] [link to this post]
 
Out of curiosity have you confirmed that your attenuation is 78dB?

The stats you posted say 63.0dB - a lot of modems don't report greater than 63dB so that, in itself doesn't mean much but your upstream attenuation is more in keeping with a downstream of about 63dB than with a downstream of 78dB (see, for instance, Zadek's stats which have a 44dB upstream attenuation for a 71dB downstream which is more consistent).

Edited by mr_bean (Mon 27-Jun-11 23:53:16)

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