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

3.2 System Time
4.
Click
5.
Navigate to MANAGEMENT > OTHER: Reference Priority .
6.
In order for the User time to be a considered a valid reference, verify that the Reference
Priority table includes an "Enabled" User [x] Time,
For more information, see "Input Reference Priorities" on page 103 and "The "User-
/User" Reference" on page 108.
7.
Move (drag & drop) the User time to the top of table, and disable all other references.
8.
Let Holdover expire. (Set it to a very short duration, if desired:
9.
Check on the HOME screen that User 0 is displayed, with a
Disciplining State will remain
not synchronized to a reference.
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 Star-
tup , 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 maintained by the integrated Real Time Clock
( RTC )
This will result in VelaSync 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.
94
recommends not to utilize this feature, unless the IRIG format you are using does
not
provide a YEAR field.
Synchronize to Battery Backed Time on Startup : See "Using Battery Backed Time on
Startup" below.
Submit at the precise moment desired.
i.
Navigate to MANGAGEMENT > OTHER: Disciplining .
ii.
In the Status panel, click the GEAR icon.
iii.
In the Oscillator Settings window, set the Holdover Timeout .)
Contrary to the
Note: User
can be used for Time, or 1PPS (but not both). For more information, see
"Local System" Reference" on
and
yellow , once Holdover has expired, since the system time is
reference discussed above, the
page 108.
CHAPTER
1PPS reference (" User/User ").
green STATUS. Note that the
reference
Local System
•
3 VelaSync User's Manual Rev. 1
"The