nanog mailing list archives
RE: Managing free pairs to prevent DSL sync. loss
From: "Matlock, Kenneth L" <MatlockK () exempla org>
Date: Tue, 17 Jul 2012 11:16:07 -0600
-----Original Message----- From: valdis.kletnieks () vt edu [mailto:valdis.kletnieks () 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 usually a big deal,
unless your termination design didn't include the ability to sink a DC current
24/7.
(Of course, actually measuring the voltage and resistance may be
non-trivial :) 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? If there's an AC component in the ground at either end (or both) that may introduce EM into adjacent pairs across the cable. And are they more or less than the EM ungrounded pairs would pick up? Ken Matlock Network Analyst 303-467-4671 matlockk () exempla org *** SCLHS Confidentiality Notice *** The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any other dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me immediately by replying to the message and deleting it from your computer. Thank you. *** SCLHS Confidentiality Notice ***
Current thread:
- Managing free pairs to prevent DSL sync. loss Anurag Bhatia (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss John Souvestre (Jul 17)
- Re: Managing free pairs to prevent DSL sync. loss valdis . kletnieks (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss Matlock, Kenneth L (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss John Souvestre (Jul 17)
- Re: Managing free pairs to prevent DSL sync. loss valdis . kletnieks (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss Matlock, Kenneth L (Jul 17)
- Re: Managing free pairs to prevent DSL sync. loss Mike Andrews (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss John Souvestre (Jul 17)
- Re: Managing free pairs to prevent DSL sync. loss valdis . kletnieks (Jul 17)
- RE: Managing free pairs to prevent DSL sync. loss John Souvestre (Jul 17)