17.1.4 HOLDOVER MODE
If all the enabled synchronization sources are unavailable, the EC20S transits into the ‘Holdover’ mode
in which it maintains the generation of the Time of Day messages and the synchronization output signals
(1PPS, 10MHz).
- According to EN 300462 – 4 – 1 (§9.2) (Transmission and Multiplexing (TM) - Generic requirements
for synchronization networks).
- Stability
• With an OCXO : < ± 2x10
-10
/day
• With a Rubidium oscillator : < ± 5x10
-11
/day
17.1.5 SHORT TERM STABILITY (ALLAN VARIANCE)
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