[ntp:questions] how does jitter and delay measure time accuracy

chipper black at intre.nt
Tue Jun 28 21:55:45 UTC 2011

Ok how do jitter and delay measure time accuracy?



Richard B. Gilbert wrote:
> On 6/26/2011 11:36 AM, chipper wrote:
>> How doe Jitter and round trip time affect local time clock time
>> acccuracy?
> They don't *affect* the accuracy, they measure it!
>> When looking at the jitter, what values would tell me that the phase
>> noise would make the local clock in accurate?
>> Are there any "Rules of thumb" to go by when looking at jitter and delay
>> to determine local clock accuracy
>> Kindly
>> Chip
> How close do you need the time to be? Many people live most of their
> lives with clocks that may well be off by a minute or two.
> Other people need numerous clocks to agree with each other +/- a few
> seconds, milliseconds, or microseconds and don't care that the time is
> not correct as long as all the clocks involved agree within the
> specified tolerance.
> Still others need to know the time +/- a few microseconds or +/- a few
> nanoseconds.
> Specify your needs. If you can't figure out how to meet your needs,
> post a description of your requirements and somebody might be able to
> give you a clue or two or three.

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