Note:
You will need to repeat this procedure each time VelaSync is
power-cycled (with no other references available), unless you enabled
the feature Synchronize to Battery Backed Time on Startup.
Example 5—Time at power-up ("Local System Time") to be considered
"Valid". GNSS input to serve as 1PPS reference
The objective of this use case is to allow VelaSync to use itself as a valid reference. This
is referred to as “Local System” time.
In order for this to happen, VelaSync requires an external Time, or 1PPS reference. In
other words, "Local System" cannot be both Time,
and
1PPS. This makes "Local Sys-
tem" a legitimate, traceable reference.
Therefore the "Local System" does not have to be manually set ("validated") by the
User after VelaSync was power cycled (as would be the case with a “User/User” ref-
erence).
Since “Local System” cannot be both
Time
, and
1PPS
input together, in this example
the GNSS input will be set as the 1PPS reference (other use cases may require using dif-
ferent references, e.g. IRIG.)
As there is no default entry for “Local System” and “GPS”, a new entry needs to be
added to the
Reference Priorities
table in order to use this combination of references.
Step-by-step procedure:
1.
Add a reference to the Reference Priority by clicking the PLUS icon. Use the fol-
lowing settings, then click
Submit
:
In the
Priority Level
text box, enter
1
. This will give this reference the
highest priority.
In the
Time
field, select “Local System”.
In the
PPS
field, select “GPS”.
Check the
Enabled
checkbox.
2.
Confirm that the first reference in the
Reference Priority
table has “Local Sys-
tem” as the
Time
input and "GNSS" as the
1PPS
input.
3.
After a power cycle or reboot, as soon as GNSS is declared valid, the System Time
will automatically be used as-is, with no manual intervention required.
3.3 Managing References
CHAPTER
3
•
VelaSync User's Manual Rev. 3
121
Summary of Contents for VelaSync 1225
Page 2: ......
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Page 12: ...BLANK PAGE X VelaSync User s Manual TABLE OF CONTENTS...
Page 28: ...16 CHAPTER 1 VelaSync User s Manual Rev 3 1 7 The VelaSync Web UI...
Page 34: ...BLANK PAGE 1 9 Regulatory Compliance 22 CHAPTER 1 VelaSync User s Manual Rev 3...
Page 104: ...BLANK PAGE 2 11 Configuring PTP 92 CHAPTER 2 VelaSync User s Manual Rev 3...
Page 251: ...Server management System specifications VelaSync User s Manual 239 APPENDIX...
Page 267: ...VelaSync User s Manual 255 APPENDIX...
