perfSONAR User Q&A and Other Discussion

[Alan Whinery <>]

Curses. After all that I got the number wrong...

Correct LEAP count for Praecis devices should be:
 LEAP=16,17 (before the leap)
 LEAP=17,17 (after the leap)

On 6/26/2015 9:29 AM, Alan Whinery wrote:
> A leap second will be inserted into CUT immediately following:
> 
> 23:59:59 CUT (GMT,UCT) June 30, 2015
> 19:59:59 EDT June 30, 2015
> 18:59:59 CDT June 30, 2015
> 17:59:59 MDT June 30, 2015
> 16:59:59 MST June 30, 2015
> 16:59:59 PDT June 30, 2015
> 13:59:59 HST June 30, 2015
> 
> Because Internet2 did use and recommend EndRun Praecis CDMA time
> standards to discipline NTP service relative to perfSONAR for several
> years, I forward the following the included-below EndRun email bulletin.
> 
> Note -- although the pending insertion of the a Leap Second into
> Coordinated Universal Time (aka CUT, GMT, UCT) will have possible
> temporary effects on any host using NTP time, it is critical to make
> sure that your CDMA or GPS-disciplined NTP servers are configured to
> assimilate the Leap Second. Some devices may automatically
> self-configure for the Leap Second. EndRun Technologies Praecis Ct and
> Praecis II do not.
> 
> If you have radio disciplined NTP service (WWV, WWVH, WWVB, CHU et al),
> you do not need to do anything.
> 
> Also note -- if you have EndRun Technologies devices and don't have
> docs, the manual at:
> Praecis II - http://www.endruntechnologies.com/pdf/USM3002-0000-000.pdf
> 
> Should be useful for getting a terminal connected and setting LEAP for
> both Praecis Ct and Praecis II.
> 
> To use a terminal program like Minicom to interact with the Praecis
> radio from a connected *nix NTP server and configure the leap second,
> refer to:
> https://net.its.hawaii.edu/network-performance/using-praecis/#40.Appendix%20A:%20Minicom%20%28serial%20terminal%20program%29|outline
> 
> It's probably best to stop NTP while you're talking to the Praecis.
> 
> ====================
> Synopsis: connect a serial terminal to Praecis (II or Ct) and once you
> get the baud/bits/stop/handshake correct --
> 
> if time is before 23:59:59 GMT 30 June 2015
> enter command "LEAP=15,16"
> 
> OR
> 
> if time is after 00:00:00 GMT 1 July 2015
> enter command "LEAP=16,16"
> 
> (I offer no help for those aiming to do the adjustment during the leap
> second itself). :^P
> 
> ============================
> 
> -Alan
> 
> -------- Forwarded Message --------
> Subject: EndRun Service Bulletin
> Date: Tue, 17 Feb 2015 15:41:42 -0800
> From: LeapSecond 
> <>
> To: 
> 
> 
> This is an important Service Bulletin about your CDMA-Synchronized
> equipment from EndRun Technologies.  You are listed in our database as
> owning a Praecis product.  Please forward this message to the person
> responsible for operation of this device.  Thank you.
> 
>>>> YOU MUST TAKE ACTION OR YOUR CLOCK MAY BE OFF BY 1 SECOND AFTER 
> JUNE 30, 2015.
> 
> There is a new leap second insertion scheduled for UTC midnight on June
> 30, 2015.  (Leap second insertions happen about every 3 years.)  A leap
> second is an extra second inserted into UTC time to keep it in alignment
> with the earth's rotation.  If your Praecis uses UTC or Local time, then
> it may be off by 1 second after June 30.  To prevent that from
> happening, please read the Leap Seconds Bulletin for instructions:
> http://www.endruntechnologies.com/pdf/LSB150106.pdf
> 
> If you are interested, see detailed information on leap seconds here:
> http://www.endruntechnologies.com/leap.htm
> 
> Best regards,
> EndRun Technical Support
> 
> 
>