mailing list archives
Re: DC fiber cut: field report
From: "Jay R. Ashworth" <jra () scfn thpl lib fl us>
Date: Sun, 20 Jul 1997 12:14:54 -0400
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.
Jay R. Ashworth jra () baylink com
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
Re: DC fiber cut: field report Eric Sobocinski (Jul 18)
RE: DC fiber cut: field report Dan Dale (Jul 18)
RE: DC fiber cut: field report Steve Martin (Jul 18)
Re: DC fiber cut: field report Joe McGuckin (Jul 19)
Re: DC fiber cut: field report Sean M. Doran (Jul 22)
Re: DC fiber cut: field report Vadim Antonov (Jul 22)
- RE: DC fiber cut: field report, (continued)