North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: DC fiber cut: field report
On Fri, Jul 18, 1997 at 06:44:21PM -0400, Robert E. Seastrom wrote: > Am I the only one who's a cables and switches weenie enough to know > that the telco's _already do this_? Large numbers of local multi-pair ^^^^^^^^^^^^^^^^ > trunking cables are pressurized with nitrogen, and they put pressure > drop alarms on them, so they know if one takes a hit. > > pressurized nitrogen is usually done to keep moisture out, not so that > they can monitor pressure loss. pressure loss in a fed, very long, > pipe is an extremely local phenomenon anyway. i think there are > spooks at some black agencies that monitor against tapping this way. > but in practice, nitrogen pressurization is only done for copper. Yes. I know. ;-) I'm told they really do pressure loss monitor the local stuff, though, even if more for dryness purposes than cable-break. Cheers, -- jra -- Jay R. Ashworth [email protected] Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "People propose, science studies, technology Tampa Bay, Florida conforms." -- Dr. Don Norman +1 813 790 7592
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