iii.
In the
Oscillator Settings
window, set the
Holdover Timeout
.)
9.
Check on the
HOME
screen that
User 0
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 page 115
.
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
Synchronize to Battery Backed
Time on Startup
, thus allowing the battery backed time to be used as System Time
upon system startup. The Battery Backed Time is also referred to as the time main-
tained by the integrated
Real Time Clock
(
RTC
)
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.
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 system is
sufficiently accurate
3.2 System Time
CHAPTER
3
•
VelaSync User's Manual Rev. 3
101
Summary of Contents for VelaSync 1225
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