[AusNOG] GPS timesource

Joshua Small JSmall at daraco.com.au
Thu Jan 28 11:19:59 EST 2016


The hobbiest solution is a Raspberry Pi with the Adafruit GPS.

It's surprisingly capable - I have a personal unit showing ~22 000 connected clients. Every time the score dips, it's because the upstream Cisco is at 100% CPU processing the NAT traffic to it.


-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Paul Gear
Sent: Thursday, 28 January 2016 9:11 AM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] GPS timesource

On 27/01/16 12:33, KIRN Paul (Powerlink) wrote:
> Hi All,
> As reported on Slashdot there have been observances of GPS time error in the last 24 hrs (during Australia Day holiday here). With reports from of a 13.7usec step change -  possibly coincidental with the decommissioning of GPS satellite SVN23 (PRN32) on 25-1-15 or other issues to with UTC correction parameters.
> http://it.slashdot.org/story/16/01/26/1735223/discrepancy-detected-in-gps-time
> https://www.febo.com/pipermail/time-nuts/2016-January/095692.html
> http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008
> Wondering if any noggers have seen any alarms on your GPS receiver time sources in the last 24 hours? 

As an adjunct question, what sort of hardware are you using for your NTP
stratum 1 sources (GPS, atomic, whatever), and are there any which are
in the affordable range for the hobbyist?


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