Troubleshooting Gnss Reception; Troubleshooting - Outputs - Safran SecureSync 2400 User Manual

5.1.5

Troubleshooting GNSS Reception

If SecureSync reports GPS, Holdover, and/or Time Sync Alarms caused by insuf-
ficient GNSS reception:
When a GNSS receiver is installed in SecureSync, a GNSS antenna can be con-
nected to the rear panel antenna connector via a coax cable to allow it to track
several satellites in order for GNSS to be an available input reference. Many
factors can prevent the ability for the GNSS receiver to be able to track the min-
imum 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), SecureSync 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 install-
ation, 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, SecureSync may
not initially be able to go into time sync. Or, if GNSS reception is subsequently
lost after initially achieving time sync, SecureSync will go into the Holdover
mode. If GNSS reception is not restored before the Holdover period expires (and
no other input references become available) SecureSync 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
SecureSync, please refer to the GNSS Reception Troubleshooting Guide, avail-
able here
5.1.6 Troubleshooting – Outputs
If the 1PPS from the DCLS OUT BNC connector and/or the 15-pin multi-I/O con-
nector outputs are not present, input power may not be applied. Or SecureSync
is not synchronized to its input references and Signature Control is enabled.
SecureSync 2400 User Manual
on the Safran website.
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