[mailto:mi...@mikea.ath.cx]
Sent: Tuesday, July 17, 2012 12:46 pm
To: NANOG Mailing List
Subject: Re: Managing free pairs to prevent DSL sync. loss
On Tue, Jul 17, 2012 at 11:16:07AM -0600, Matlock, Kenneth L wrote:
> That brings up an interesting question. I assumed the ground potential
>
On Tue, Jul 17, 2012 at 11:16:07AM -0600, Matlock, Kenneth L wrote:
> That brings up an interesting question. I assumed the ground potential
> stays the same between 2 points, but have there been any studies to see
> if it's actually DC, or if there's an AC component to it?
Thaat's not a safe as
-Original Message-
From: valdis.kletni...@vt.edu [mailto:valdis.kletni...@vt.edu]
> No, it will be strictly a DC current, with the amperage easily
calculated from the voltage difference between the two ends and the
resistance of
> however many cable-feet of wire is involved. Not usuall
On Tue, 17 Jul 2012 10:16:17 -0500, "John Souvestre" said:
> Yes, but would this result in more or less noise than an open end acting
> like an antenna? And would the ground loop noise be in the DSL spectrum?
No, it will be strictly a DC current, with the amperage easily calculated from
the volta
: Tuesday, July 17, 2012 10:14 am
To: valdis.kletni...@vt.edu; John Souvestre
Cc: NANOG Mailing List
Subject: RE: Managing free pairs to prevent DSL sync. loss
Yeah, grounding both ends will result in some current traversing across the
pairs all the time because of differences in ground potential
[mailto:valdis.kletni...@vt.edu]
Sent: Tuesday, July 17, 2012 9:00 AM
To: John Souvestre
Cc: 'NANOG Mailing List'
Subject: Re: Managing free pairs to prevent DSL sync. loss
On Tue, 17 Jul 2012 09:15:59 -0500, "John Souvestre" said:
> Have you considered grounding one end (or
On Tue, 17 Jul 2012 09:15:59 -0500, "John Souvestre" said:
> Have you considered grounding one end (or both) of the free pairs? Perhaps
> this would reduce the amount of noise they pick up.
Grounding both ends will probably result in "hilarity ensues". And I suspect
that Anurag
can't ground th
John Souvestre - New Orleans LA - (504) 454-0899
-Original Message-
From: Anurag Bhatia [mailto:m...@anuragbhatia.com]
Sent: Tuesday, July 17, 2012 5:19 am
To: NANOG Mailing List
Subject: Managing free pairs to prevent DSL sync. loss
Hello everyone.
I am having some very bad time
Hello everyone.
I am having some very bad time due to my ISP's poor last mile (in India).
DSL is loosing sync. consistently and this time problem seems quite
interesting so I though to ask how ISPs across world managing it. Problem
is high attenuation & low SNR because of "lot of free pairs" in
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