Holdover in synchronization applications: Difference between revisions

Revision as of 21:03, 12 September 2011

Revision as of 21:03, 12 September 2011

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==Defining Holdover==

In [[Synchronization]] applications holdover can be defined as:<ref>http://www.etsi.org/deliver/etsi_i_ets/300400_300499/30046201/01_60/ets_30046201e01p.pdf</ref>

<blockquote> An operating condition of a clock which has lost its controlling input and is using stored

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and frequency variations, allowing the locked condition to be reproduced within specifications. Holdover

begins when the clock output no longer reflects the influence of a connected external reference, or

transition from it. Holdover terminates when the output of the clock reverts to locked mode condition.<ref>http:/blockquote/www.etsi.org/deliver/etsi_i_ets/300400_300499/30046201/01_60/ets_30046201e01p.pdf</ref>

</blockquote>

Clock Accuracy in MIL-PRF-55310<ref>http://standards.gsfc.nasa.gov/reviews/mil/mil-prf-55310d/mil-prf-55310d.pdf</ref>