iii. In the Oscillator Settings window, set the Holdover Timeout.)
9. Check on the HOMEscreen that User0 is displayed, with a green STATUS.
Note that the Disciplining State will remain yellow, once Holdover has
expired, since the system time is not synchronized to a reference.
Note: Contrary to the User reference discussed above, the Local Sys-
tem reference can be used for Time, or 1PPS (but not both). For
more information, see "The "Local System" Reference" on page176.
3.2.1.4 Using Battery Backed Time on Startup
Upon system startup, by default VersaSync will not declare synchronization until
one of the external references becomes available and valid.
This functionality can be overridden by enabling the Synchronize to Battery
Backed Time on Startup, thus allowing the battery backed time to be used as Sys-
tem Time upon system startup. The Battery Backed Time is also referred to as the
time maintained by the integrated Real Time Clock (RTC)
This will result in VersaSync providing a System Time before one of the external
references becomes available and valid. This will happen automatically, i.e.
without user intervention. As soon an external reference will become available, its
time will take precedence over the battery backed time: The System Clock will
adjust the System Time for any time difference.
Note: The Battery Backed Time is also referred to as the time main-
tained by the integrated Real-Time Clock (RTC).
Use Cases
Using the Battery Backed Time on Startup is typically used in these cases:
a. If the synchronization state is to be reached as quickly as possible, even if
this means the time distributed initially will most likely be less accurate than
an external time reference.
b. A system is intended to operate autonomously (i.e. without any external ref-
erences) and
the hand-set time entered manually during commissioning of the sys-
tem is sufficiently accurate
3.2 System Time
CHAPTER 3 • VersaSync User Manual Rev. 12
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