Holdover in synchronization applications: Difference between revisions

Revision as of 21:01, 12 September 2011

Revision as of 21:03, 12 September 2011

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[[Synchronization]]

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

<blockquote> The '''blockquote''' tag will indent both margins when needed instead of the left margin only as the colon does. </blockquote>

data, acquired while in locked operation, to control its output. The stored data are used to control phase

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.</blockquote>

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

Time Error Model in ITU G.810<ref>http://www.itu.int/rec/T-REC-G.810-199608-I</ref>

Definition of Holdover<ref>http://www.etsi.org/deliver/etsi_i_ets/300400_300499/30046201/01_60/ets_30046201e01p.pdf</ref>

Definition of a Disciplined Oscillator<ref>http://tf.nist.gov/general/enc-d.htm</ref>