[11076] in North American Network Operators' Group
Re: DC fiber cut: field report
daemon@ATHENA.MIT.EDU (Jay R. Ashworth)
Sun Jul 20 12:38:15 1997
Date: Sun, 20 Jul 1997 12:14:54 -0400
From: "Jay R. Ashworth" <jra@scfn.thpl.lib.fl.us>
To: "Robert E. Seastrom" <rs@bifrost.seastrom.com>
Cc: nanog@merit.edu
In-Reply-To: <199707182244.SAA07741@bifrost.seastrom.com>; from "Robert E. Seastrom" <rs@bifrost.seastrom.com> on Fri, Jul 18, 1997 at 06:44:21PM -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.
Cheers,
-- jra
--
Jay R. Ashworth jra@baylink.com
Member of the Technical Staff Unsolicited Commercial Emailers Sued
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