Orolia VersaSync User Manual

constellation the satellite belongs to:
Letter symbol GNSS Constellation
G GPS
R GLONASS
E Galileo
J QZSS
C BeiDou
I IRNSS
The number next to the letter indicates the satellite number. The number below
indicates the signal strength (C/N
o
).
3.3.4 Holdover Mode
When input references have been supplying input to VersaSync and input from all the ref-
erences has been lost, VersaSync will not immediately declare loss of time synchronization,
but first will go into Holdover mode. While the unit is in Holdover mode, the time outputs
are derived from the internal 10MHz oscillator incrementing the System Time, but the
oscillator is not disciplined/steered by the external reference e.g., GNSS.
Because of the stability of the internal oscillator, accurate time can still be derived even
after all the primary references are no longer valid or present. The more stable the oscil-
lator is without an external reference, the longer this holdover period can be and have it
still maintain very accurate outputs. The benefit of Holdover is that time synchronization
and the availability of the time outputs is not immediately lost when input references are
no longer available.
3.3 Managing References
CHAPTER 3 • VersaSync User Manual Rev. 7.0
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Orolia VersaSync Specifications

General

Brand	Orolia
Model	VersaSync
Category	Server
Language	English