Using Battery Backed Time On Startup - Spectracom VelaSync 1232 User Manual

9. Check on the HOME screen that
3.2.1.4 Using Battery Backed Time on Startup
Upon system startup, by default VelaSync will not declare synchronization until one of
the external references becomes available and valid.
This functionality can be overridden by enabling the
Time on
upon system startup. The Battery Backed Time is also referred to as the time main-
tained by the integrated
This will result in VelaSync providing a System Time before one of the external ref-
erences 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 pre-
cedence over the battery backed time: The System Clock will adjust the System Time
for any time difference.
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
b. A system is intended to operate autonomously (i.e. without any external ref-
CHAPTER 3 • VelaSync User's Manual Rev. 3
iii. In the
Oscillator Settings
that the Disciplining State
the system time is not synchronized to a reference.
Note: Contrary to the
tem reference can be used for Time, or 1PPS (but not both). For more
information, see "The "Local System" Reference" on
Startup, thus allowing the battery backed time to be used as System Time
Real Time Clock
Note: The Battery Backed Time is also referred to as the time main-
tained by the integrated
means the time distributed initially will most likely be less accurate than an
external time reference.
erences) and
the hand-set time entered manually during commissioning of the system is
sufficiently accurate
window, set the Holdover
User 0 is displayed, with a
will remain yellow, once
User reference discussed above, the
Synchronize to Battery Backed
(RTC)
Real-Time Clock (RTC).
3.2 System Time
Timeout.)
green STATUS. Note
Holdover has expired, since
Local Sys-
page 115.
101