GNSS to be an available input reference. Many factors can prevent the ability for the GNSS
receiver to be able to track the minimum number of satellites.
With the GNSS antenna installed outdoors, with a good view of the sky (the view of the sky is
not being blocked by obstructions), VersaSync will typically track between 5-10 satellites (the
maximum possible is 12 satellites). If the antenna’s view of the sky is hindered, or if there is a
problem with the GNSS antenna installation, the GNSS receiver may only be able to a few
satellites or may not be able to track any satellites at all.
When GNSS is a configured time or 1PPS input reference, if the GNSS receiver is unable to
continuously track at least four satellites (until the initial GNSS survey has been completed) or at
least one satellite thereafter, the GNSS signal will not be considered valid. If no other inputs
are enabled and available, VersaSync may not initially be able to go into time sync. Or, if
GNSS reception is subsequently lost after initially achieving time sync, VersaSync will go into
the Holdover mode. If GNSS reception is not restored before the Holdover period expires
(and no other input references become available) VersaSync will go out of sync. The GNSS
reception issue needs to be troubleshot in order to regain time sync.
For additional information on troubleshooting GNSS reception issues with VersaSync, please
refer to the GNSS Reception Troubleshooting Guide, available here on the Spectracom website.
5.1.6 Troubleshooting – 1PPS, 10 MHz Outputs
If the 1PPS and/or the 10MHz output(s) are not present, input power may not be applied. Or
VersaSync is not synchronized to its input references and Signature Control is enabled.
Web UI Page Current Status Indication Troubleshooting
HOME page Reference Status
Table
One or more
input references
indicate “Not
Valid” (red)
All available Input References have
been lost. The Reference Status table
on this same page will show the cur-
rent status of all inputs (Green is valid
and red is not valid, or not present). If
Signature Control is enabled in this
state, the output may be disabled.
1. Make sure the Input Reference Pri-
ority table still has the desired inputs
enabled, based on desired priority.
2. Make sure desired input references
are still connected to the correct input
port of VersaSync.
3. Verify GNSS antenna installation (if
applicable).
238 VersaSync User Manual
APPENDIX
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