[ntp:questions] Windows time question.
unruh at wormhole.physics.ubc.ca
Tue May 3 20:02:50 UTC 2011
On 2011-05-03, David J Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> As the OP who started this (long and sometimes ammusing) thread...
>> I do carry a GPS receiver with me, but sadly not PPS capable, I use it
>> for location determination/tracking/navigating etc. Maybe I should
>> include a GPS18 or 16 in the already bulging Laptop bag I lug arround.
> Even better if there were on on a USB stick, and you had a handy USB
> extension lead!
Unfortunately , AFAIK, usb is terrible for delivering a PPS-- ie no
interrupt lines-- the problem with having only two data lines (one beign
> How critical is your time need? If it's within minutes, then the PC's
> clock is likely good enough. If it's in the UK or Europe, I would be
> surprised if pool servers did not get you well within the second - perhaps
> within 100msec - particularly if you set the servers based on the country
> you're in. I suspect that if you need closer than tens of milliseconds,
> carrying round a GPS 18x LVC (which I jokingly suggested) may actually be
> necessary. NTP was designed when connections were nothing like as good as
> they are now, and is supposedly robust in those circumstances. It is
> designed for 24-hours operation, though.
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