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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.

Netgear reducing noise margin



 
 
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  #1  
Old January 25th 06, 12:53 PM posted to uk.telecom.broadband
David G
external usenet poster
 
Posts: 101
Default Netgear reducing noise margin

I have a Netgear DG834 router V2. Yesterday I upgraded the firmware to
3.01.25. The noise margin improved as below

ADSL Link Downstream Upstream
Connection Speed 1152 kbps 288 kbps
Line Attenuation 59 db 15.5 db
Noise Margin 13 db 21 db


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3.01.25


ADSL Link Downstream Upstream
Connection Speed 1152 kbps 288 kbps
Line Attenuation 56 db 15.5 db
Noise Margin 18 db 21 db

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


As you can see it improved from 13 to 18. But by the end of the day this
had dropped to 11. It is switched off overnight and a while after
restarting today I notice that it is still at 11. I rebooted the router
from the interface and it went back to 18. It has now dropped back to 15
and presumably will continue to drop. Rebooting will again reset to
17/18. This in not causing apparent connection problems but I am puzzled
as to why this is happening.

Any ideas please

--
Regards


David G
(remove r u n)
  #2  
Old January 25th 06, 01:42 PM posted to uk.telecom.broadband
Dave Moss
external usenet poster
 
Posts: 2
Default Netgear reducing noise margin


"David G" [email protected] wrote in message
...
I have a Netgear DG834 router V2. Yesterday I upgraded the firmware to
3.01.25. The noise margin improved as below

ADSL Link Downstream Upstream
Connection Speed 1152 kbps 288 kbps
Line Attenuation 59 db 15.5 db
Noise Margin 13 db 21 db



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~
3.01.25


ADSL Link Downstream Upstream
Connection Speed 1152 kbps 288 kbps
Line Attenuation 56 db 15.5 db
Noise Margin 18 db 21 db


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~

As you can see it improved from 13 to 18. But by the end of the day this
had dropped to 11. It is switched off overnight and a while after
restarting today I notice that it is still at 11. I rebooted the router
from the interface and it went back to 18. It has now dropped back to 15
and presumably will continue to drop. Rebooting will again reset to
17/18. This in not causing apparent connection problems but I am puzzled
as to why this is happening.

Any ideas please

--
Regards


David G


Its a common thing with the DG834. The noise margin comes down over a
period of time. Someone once said it worked out an average over a period
of time. I don't know anymore about it, but it has been seen with several
units I have fitted in the past year or so.

I think someone contacted netgear about this and they said it was an average
too. So the best time to look for the correct noise margin is after the
router has been running for some time (a few days), or certainly several
hours after switch on.






  #3  
Old January 25th 06, 02:26 PM posted to uk.telecom.broadband
David G
external usenet poster
 
Posts: 101
Default Netgear reducing noise margin

Dave Moss wrote:

Its a common thing with the DG834. The noise margin comes down over a
period of time. Someone once said it worked out an average over a period
of time. I don't know anymore about it, but it has been seen with several
units I have fitted in the past year or so.

I think someone contacted netgear about this and they said it was an average
too. So the best time to look for the correct noise margin is after the
router has been running for some time (a few days), or certainly several
hours after switch on.


Thanks for that. I have not seen it mentioned anywhere before.


--
Regards


David G
(remove r u n)
  #4  
Old January 25th 06, 03:08 PM posted to uk.telecom.broadband
R. Mark Clayton
external usenet poster
 
Posts: 699
Default Netgear reducing noise margin


"David G" [email protected] wrote in message
...


As you can see it improved from 13 to 18. But by the end of the day this
had dropped to 11. It is switched off overnight and a while after
restarting today I notice that it is still at 11. I rebooted the router
from the interface and it went back to 18. It has now dropped back to 15
and presumably will continue to drop. Rebooting will again reset to 17/18.
This in not causing apparent connection problems but I am puzzled as to
why this is happening.

Any ideas please

--
Regards


David G


There are several possibles, including progressive electrolytic action while
the phone is off hook and periodic bursts of noise (e.g from your central
heating or fridge starting). The latter will drag the margin down over
time, although performance will be OK except when the spike of noise occurs.


 




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