c.
To utilize a backup reference as soon as possible after a power cycle or reboot of
SecureSync, while waiting for the primary reference (e.g., GNSS) to become valid. To
this end, in the Edit System Time window, the checkbox Synchronize to Battery Backed Time
on Startup must be checked, AND the User/User reference is assigned a reference pri-
ority number other than "1". Note that a Time jump and/or 1PPS jump are likely to hap-
pen once the primary reference becomes valid.
Combining a User Time reference with a non-User 1PPS reference or vice versa is not a typical
use case. Use the Local System reference instead, see "The "Local System" Reference" on
page166.
Built-in safety barrier
In order to "validate" (= green status lights) the User/User reference, the hand-set time must be
manually submitted every time after SecureSync reboots or resets, or after the Holdover period
has expired: In the Edit System Time window, the checkbox Manual Time Set must be checked.
The System Time displayed in the field below will become valid the moment the Submit button is
clicked.
See also below, "How long will the User/User reference be valid?": The notion of limiting the
validity of the User/User reference also serves as a safety feature.
How long will the User/User reference be valid?
Since the User/User reference does not qualify as a legitimate, traceable time, it becomes
invalid once SecureSync is reset, or power- cycles, or after the Holdover Time expires
(whichever occurs first). It then needs to be set manually and submitted again (Edit System Time >
Manual Time Set).
The only workaround for this is "Using Battery Backed Time on Startup" on page152. This will
allow SecureSync to apply the User/User reference after a power-cycle without manual inter-
vention.
How to setup the User/User Reference
168
CHAPTER 3 • SecureSync User Reference Guide Rev. 26
3.3 Managing References
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