[time-nuts] Basic Stratum 1 question
Richard H McCorkle
mccorkle at ptialaska.net
Thu Aug 2 16:08:51 EDT 2007
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+mccorkle=ptialaska.net at febo.com RETRY
>> In the telecommunications world, stratum refers to the holdover
>> performance of an oscillator in the event of loss of synchronization.
>> Stratum 1, Stratum 2, Stratum 3, and Stratum 4 are the most typical. A
>> Stratum 1 clock has an accuracy of 1.0 x 10-11, Stratum 2 has an
>> accuracy of 1.6 x 10-8, Stratum 3 has an accuracy of 4.6 x 10-6, and
>> Stratum 4 has an accuracy of 3.2 x 10-5.
> That's frequency rather than time. Right?
> Isn't there also something about how long it has to be within the frequency spec?
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The ITU stratum 1 time error mask for optical and wired networks
is attached and shows the allowable time error over a given
sampling period to remain within the stratum 1 specification.
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