On Thu, Apr 5, 2018 at 8:25 AM, Thomas Laus wrote:
> On 2018-04-04, Maria Iano wrote:
> > I'm purchasing ntp appliances to put into three datacenters. Does it make
> > sense to purchase two that use GPS and two that use WWVB, and configure
> > them as peers?
> The USA Bureau of Time Standards h
p.org] On Behalf Of Steven Sommars
> Sent: Monday, August 13, 2018 7:10 AM
> To: lau...@acm.org
> Cc: questions@lists.ntp.org
> Subject: Re: [ntp:questions] does this make sense?
>
> Search for: CDMA shutdown
>
> CDMA NTP servers lack an automated leap second mechanism, a
On 8/13/18 10:09 AM, Steven Sommars wrote:
> Search for: CDMA shutdown
>
> CDMA NTP servers lack an automated leap second mechanism, as far as I
> can tell.
>
My CDMA experience dealt with an Endrun Tempus LX receiver only. It
received and used the leap second information that was sent along wi
Search for: CDMA shutdown
CDMA NTP servers lack an automated leap second mechanism, as far as I can
tell.
On Thu, Apr 5, 2018 at 7:25 AM, Thomas Laus wrote:
> On 2018-04-04, Maria Iano wrote:
> > I'm purchasing ntp appliances to put into three datacenters. Does it
> make sense to purchase t
On 2018-04-04, Maria Iano wrote:
> I'm purchasing ntp appliances to put into three datacenters. Does it make
> sense to purchase two that use GPS and two that use WWVB, and configure them
> as peers?
The USA Bureau of Time Standards has a link for timing receiver
vendors:
https://www.nist.gov/pm
William Unruh wrote:
On 2018-04-05, Terje Mathisen wrote:
I've designed similar setups a couple of times: Since we're located
in Europe my backup was the German radio transmitter since that one
uses spread spectrum modulation of the carrier, enabling 10-15 us
precision.
That is about 2 miles
David Taylor wrote:
On 04/04/2018 20:47, Maria Iano wrote:
Thanks William, I will go with GPS.
Maria
That's a good choice. These boxes are low-cost (but not yet multiple
GNSS systems - check with the vendor), and have good hold-over in the
event of GPS failure:
http://www.leobodnar.com/shop
On 04/04/2018 20:47, Maria Iano wrote:
Thanks William, I will go with GPS.
Maria
That's a good choice. These boxes are low-cost (but not yet multiple
GNSS systems - check with the vendor), and have good hold-over in the
event of GPS failure:
http://www.leobodnar.com/shop/index.php?main_pa
On 2018-04-04, Maria Iano wrote:
> I'm purchasing ntp appliances to put into three datacenters. Does it make
> sense to purchase two that use GPS and two that use WWVB, and configure them
> as peers?
Well, WWVB is about a million times less accurate than GPS (even with a cheap
GPS it is well ov
On 2018-04-05, Terje Mathisen wrote:
> Maria Iano wrote:
>> Thanks for your reply, David. Accuracy to within milliseconds is fine
>> for us. We currently have four old GPS appliances in four data
>> centers that we are replacing, and my thought is that some vendor
>> diversity would be good.
>>
>>
Maria Iano wrote:
Thanks for your reply, David. Accuracy to within milliseconds is fine
for us. We currently have four old GPS appliances in four data
centers that we are replacing, and my thought is that some vendor
diversity would be good.
We are only staying in two of those data centers, so t
On 04/04/2018 17:29, Maria Iano wrote:
I'm purchasing ntp appliances to put into three datacenters. Does it make sense
to purchase two that use GPS and two that use WWVB, and configure them as peers?
Thanks,
Maria
Probably, yes, although these days I would suggest that GPS (including
GLONASS
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