[ntp:questions] Problem with system clock refresh

Unruh unruh-spam at physics.ubc.ca
Wed Nov 25 21:56:57 UTC 2009


JuanFran <juanfranciscojara at gmail.com> writes:

>On 23 nov, 19:48, Unruh <unruh-s... at physics.ubc.ca> wrote:
>> JuanFran <juanfranciscoj... at gmail.com> writes:
>> >On 23 nov, 15:02, "David J Taylor" <david-tay... at blueyonder.not-this-
>> >bit.nor-this-part.co.uk.invalid> wrote:
>> >> "JuanFran" <juanfranciscoj... at gmail.com> wrote in message
>>
>> >>news:d693971e-be41-4a9b-9926-ed4a04f5b319 at j9g2000vbp.googlegroups.com...
>>
>> >> > Good mornig. I have a trouble with NTP. I want a refresh my sistem
>> >> > clock (client) with a LAN Server each 5 minutes. I don=92t know any
>> >> > parameter of NTP protocol for this configuration. It=92s possible? The
>> >> > refresh it done usually, but takes a long time.
>>
>> >> > I use Windows XP with meinberg software (client and server monitor).
>>
>> >> > Thank you!
>>
>> >> > PD: sorry for my poor english! :-)
>>
>> >> Why do you want to do this, Juan? =A0NTP will automatically adjust the
>> >> interval between contacts to the server according to its own needs, and
>> >> you don't normally need to set this. =A0If you /really/ need to do this, =
>> >you
>> >> could edit the ntp.conf file with notepad to have entries similar to this=
>> >:
>>
>> >> _____________________________________________
>> >> server =A0 =A0<lan-address> =A0 =A0maxpoll 8 =A0 =A0iburst
>>
>> >> server =A0 =A0<internet-address> =A0 =A0minpoll 10
>> >> server =A0 =A0<internet-address> =A0 =A0minpoll 10
>> >> server =A0 =A0<internet-address> =A0 =A0minpoll 10
>> >> server =A0 =A0<internet-address> =A0 =A0minpoll 10
>> >> _____________________________________________
>>
>> >> This sets the LAN-server to poll not less than once every 256 (2^^8)
>> >> seconds, and have backup Internet servers which are polled at not less
>> >> than 1024 (2^^10) second intervals.
>>
>> >> Cheers,
>> >> David
>> >Hello! I work in a project that it need synchronize a LAN for collect
>> >data and images in real time. I need a lot of precision in the
>> >synchronization of all computers on my LAN.
>>
>> We have no idea what "a lot of precision" means. does it mean to the second? Or to
>> the nanosecond? If you want better than milliseconds, a) do not use Windows, and
>> b) get a GPS receiver with PPS for each of your computers.
>>
>> >Thanks for your answer! I will try your solutions
>> >Regars!

>Hi! My system should be accurate to within approximately 10

OK, that should be possible even on Windows. 

>milliseconds .I think forcing upgrade all computers in my LAN at the

Sorry, again I do not know what "forcing upgrade" means. 
Running ntp from an outside web timeserver should give you 10ms
accuracy.

>beginning should be enough. Thank you very much for the anwser!




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