[time-nuts] Discipline an oscillator with NTP?

[Jim Lux]

On 7/22/11 11:59 AM, Chuck Forsberg WA7KGX N2469R wrote:
> On 07/22/2011 11:48 AM, Javier Herrero wrote:
>> El 22/07/2011 20:39, michael taylor escribió:
>>>
>>>
>>> I think all NTP server appliances have this functionality by their
>>> nature, whether or not the oscillator is of particular high quality
>>> (low noise) or not. Many of the low-end ones likely just use a
>>> standard oscillator "in a can" [2] that the embedded processor uses.
>> No, ntp algorithm does not adjust the oscillator itself.
>>

> Until LightSquared goes online we will have GPS available almost everywhere
> high speed internet is available.


Except that GPS requires a view of the sky (or cabling to a place with a 
view of the sky).. There are a quite a lot of applications where you 
might have a network connection, but not view of the sky.

The question is whether NTP is decent for disciplining.
(PTP would almost certainly work)


>
> NTP disicipline is possible but the necessary time constants might approach
> the MTFB of associated systems.
>