Troubleshooting Gnss Reception; Troubleshooting - Keypad Inoperative - Spectracom SecureSync User Reference Manual

6.5

Troubleshooting GNSS Reception

If SecureSync reports Holdover and/or Time Sync Alarms caused by insufficient GNSS reception:
When a GNSS receiver is installed in SecureSync, a GNSS antenna can be connected 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 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), SecureSync will typically track between 5-10 satellites (the max-
imum 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 con-
tinuously 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 SecureSync GNSS Reception Troubleshooting Guide , available from the Spec-
tracom website (visit
Support à Library à Installation and Troubleshooting Guides).
6.6 Troubleshooting – Keypad Inoperative
The SecureSync front panel keypad can be locked in order to prevent inadvertent operation. It can
be locked and unlocked using either the keypad or the Web UI. When locked, the keypad operation
is disabled until it is unlocked using either of the two following processes:
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6 SecureSync User Reference Guide Rev. 18
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To unlock the front panel keypad using the keypad (locally):
1.
Perform the following key sequence:
To unlock the front panel keypad using the Web UI (remotely):
1.
Open the SecureSyncWeb UI, and navigate to the Setup/Front Panel page.
2.
Change the Lock from "Enabled" to "Disabled".
3.
Click the Submit button.
6.5 Troubleshooting GNSS Reception
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