[ntp:questions] NIST vs. pool.ntp.org ?

steven Sommars stevesommarsntp at gmail.com
Thu Mar 28 19:56:35 UTC 2013


A report on UTC(NIST) - UTC(USNO) can be found at
http://tf.boulder.nist.gov/general/pdf/2663.pdf



On Thu, Mar 28, 2013 at 7:22 AM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 03/27/2013 10:45 PM, David Woolley wrote:
>
>> Robert Scott wrote:
>>
>>> I am confused about the proper usage of pool.ntp.org and NIST.
>>> pool.ntp.org seems to be a collection of private sector time servers
>>> offered for all to use, but with registration expected for regular
>>>
>>
>> The pool system has no provision for enforcing registration. It wouldn't
>> make sense to hand out a random server address if most of them then
>> refused to serve you because you hadn't registered.
>>
>>  users. And NIST has a government run set of time servers. Neither
>>> group (NIST or pool.ntp.org) seems to include or referece the other.
>>>
>>
>> I would hope all the pool servers ultimately reference their national
>> equivalent of NIST and therefore what becomes, after the fact, UTC.
>>
>> I think you will find that Navstar (GPS) and WWV times are traceable to
>> NIST.
>>
>
> Yes and no.
>
> GPS is traceable to USNO. USNO and NIST have traceability between each
> other within the BIPM framework.
>
>
>  MSF times are traceable to NPL.
>>
>
> NPL is traceable to both USNO and NIST within the BIPM framework.
>
>
>  Are they in competition? Who normally uses the NIST servers and who
>>> uses pool.ntp.org?
>>>
>>
>> The open NIST servers are heavily overloaded, so probably don't serve
>> the highest quality time, but they are likely to be around for a long
>> time.
>>
>
> I would setup a local server under your control. It will help both from
> debugging and noise perspective.
>
> Cheers,
> Magnus
>
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