Managing free pairs to prevent DSL sync. loss

John Souvestre johns at
Tue Jul 17 15:16:17 UTC 2012

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?


    John Souvestre - New Orleans LA - (504) 454-0899

-----Original Message-----
From: Matlock, Kenneth L [mailto:MatlockK at] 
Sent: Tuesday, July 17, 2012 10:14 am
To: valdis.kletnieks at; 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 over long-ish

Ken Matlock
Network Analyst
matlockk at

-----Original Message-----
From: valdis.kletnieks at [mailto:valdis.kletnieks at]
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 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 the free pairs, because the copper belongs
to the provider.
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