perfSONAR User Q&A and Other Discussion

[Alan Whinery <>]

Since, historically, many owamp nodes and etc. have had time standards attached --

If you have a CDMA, HF-Radio, GPS disciplined time standard, you should go read up on how to add a leap second to your device, prior to 0:00 GMT 1 July 2015, otherwise your time will be 1 second off OR your stratum 1 server will choose a network source over your time standard.

Most of the standards I have seen have a variable that you set for a pending leap second, and the device will add the second at the appropriate time.

The message below addresses EndRun Technologies Praecis CDMA products.

-------- 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