[time-nuts] Basic Stratum 1 question

Richard H McCorkle mccorkle at ptialaska.net
Thu Aug 2 20:08:51 UTC 2007


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>> 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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Hal,
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.

Richard

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