[time-nuts] Leap second to be introduced at midnight UTC December 31 this year

Wojciech Owczarek wojciech at owczarek.co.uk
Thu Jul 21 13:12:23 EDT 2016

Every year... always makes me wonder, do these vendors even test this themselves? I know at least one vendor who disn't have GPS simulators and relied on Trimble's built-in test mode - which gives you 13-bit week counters, whereas the satellites give you 10-bit counters. So the vendor assumed 13-bit and was comparing the current wc to 13-bit that never came. Luckily I found the issue months before the event, and only because we purchased GPS simulators - which I recommend to anyone running timing services in production.

Oh well, at least this keeps us busy.

  Original Message  
From:noah.robin at gmail.com
Sent:21 July 2016 5:11 p.m.
To:time-nuts at febo.com
Reply to:time-nuts at febo.com
Cc:hmurray at megapathdsl.net
Subject:Re: [time-nuts] Leap second to be introduced at midnight UTC December 31 this year

> On Jul 21, 2016, at 5:23 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> noah.robin at gmail.com said:
>> Discovered that my commercial GPS appliances opted to *apply* yesterday's
>> pending leap second, which has made for an interesting day.
> Could you please say more?
> How are you working around it?
> Vendor?  Model?  Can you take the cover off (or peer in through the vents) 
> and see what type of GPS receiver they are using?

In earlier email. 

> I assume the gear is recent or the problem would have been discovered the 
> last time we had a leap second.  Have you contacted the vendor?  Have they 
> confirmed the problem?  Any estimate on when they will ship new firmware?

We just finished replacing our previous gear with this a week ago; timing is everything. :)  Vendor was contacted yesterday and have supplied a patch this morning to reduce the GPS->UTC offset back to 17 until they get a more permanent fix from Trimble. I've not installed it yet, but the vendor states the patch won't persist across reboots. 

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