[189301] in North American Network Operators' Group
Re: Cost-effectivenesss of highly-accurate clocks for NTP
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Sun May 15 13:58:23 2016
X-Original-To: nanog@nanog.org
To: Mel Beckman <mel@beckman.org>
From: Valdis.Kletnieks@vt.edu
In-Reply-To: <46639B27-FC4E-4111-9BE7-6A2580EAB517@beckman.org>
Date: Sun, 15 May 2016 13:58:14 -0400
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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On Sun, 15 May 2016 15:21:02 -0000, Mel Beckman said:
> But a more critical deployment of rubidium clocks is in cash-strapped public
> safety institutions, such as local police dispatch centers. Timing is crucial
> for the squad car communication systems, which these days are all digital,
> based on wireless T1/T3 trunks to remote repeaters. The clocking on these
> trunks can't drift much before voice communication fails due to repeater
> outages. The telecom gear has OXCO clocks that can provide a few hours
> holdover. A rubidium clock onsite provides coverage for longer outages.
That may be the scariest entry on "Things I was not aware of" for quite
some time....
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