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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Cracking noise margin



 
 
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  #1  
Old September 14th 05, 01:40 PM posted to uk.telecom.broadband
Tiscali Tim
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Posts: 755
Default Cracking noise margin

In an earlier contribution to this discussion,
James wrote:

http://home.clara.net/jrm64/images/snr.png

What's that all about then

Netgear DG834G

Just got a 2MB regrade yesterday, I was surprised it passed BT due to
my SNR being consistantly over 45db and a very low noise margin when
I was on 1MB. However everything seems to be ok, getting good speeds
during the day, but last night it was very erratic, this morning back
to normal. Maybe contention kicking in, never had a problem before
with 512 or 1MB.


If you *really* had an SNR of that, the signal would be at a few megavolts!

Does your router have a status page which reports CRC and other related
errors? If so, have a look at that when the speed drops, and see whether the
error rate has suddenly gone up. The throughput speed can drop dramatically
if each frame has be sent umpteen times before arriving intact.
--
Cheers,
Tim
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  #2  
Old September 14th 05, 10:28 PM posted to uk.telecom.broadband
poster
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Default Cracking noise margin

On 14 Sep 2005 14:56, James wrote:

There does not appear to be anything on the router to monitor errors
[not that I can see anyway].


One would hope it is in there somewhere... The Ebuyer sub-25 quid units
I have in use (and the Dabs Value ones) using Conexant hard/software do
provide such stats, but having said that, the more expensive kit may be
"hiding" the information, or one has to use Telnet to see it, perhaps ?


--
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