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Line 27: ==How GPS Derived Timing Can Fail== GPS is sensitive to jamming etc because the signal levels are so low <ref>http://tf.nist.gov/sim/2010_Seminar/SIM_2010_GPS_Lombardi.ppt</ref> GPS outage not initially an issue because clocks can go into Holdover <ref>http://www.syncuniversity.org/drsync/q45.php</ref>

Holdover in synchronization applications: Difference between revisions