Reference Clock Parameters for Digital Communications Systems Applications

Peter Kartaschoff

Abstract: The choice of correctly defined and useful parameters for characterizing the performance of reference clocks used in digital communications systems is a subject of efforts in the CCITT and the CCIR. the consultative technical bodies of the Iru. The operation of the systems depends on timing. Thus the CCITT has chosen in its Recommendation 6811, to specify the clock performance requirement by starting a maximum allowable time interval error, i.e. a clocks time departure after initial synchronization. On the other hand the commonly used characterization of clock performance is based on frequency instability as the basic phenomenon. CCIR Recommendation 538 therefore states the well known polynomial form of the spectral density of random frequency departures. It is now possible to estimate a probable time interval error if the model parameters of the clock are known. This error depends on the initial synchronization error, the frequency drift, the initial frequency setting error and the random frequency instability.
Published in: Proceedings of the 12th Annual Precise Time and Time Interval Systems and Applications Meeting
December 2 - 4, 1980
Goddard Space Flight Center
Greenbelt, Maryland
Pages: 515 - 549
Cite this article: Kartaschoff, Peter, "Reference Clock Parameters for Digital Communications Systems Applications," Proceedings of the 12th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, December 1980, pp. 515-549.
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