Caution: Since the User/User reference is not traceable to a valid ref-
erence, it does not qualify as a legitimate time source. Operating
SecureSync with a manually set User time bears the risk of inad-
vertently outputting an illegitimate System Time thought to be a
valid reference time.
Use cases for the "User/User" reference
The User/User reference is provided for the following use cases:
a. No external references are available (yet), but you need a reference for test-
ing or setup purposes. This may be the case e.g., while waiting for a GNSS
antenna to be installed.
b. No external references are required e.g., if SecureSync is used solely to syn-
chronize computers on a network, with no need for traceable UTC-based
timing.
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 check-
box Synchronize to Battery Backed Time on Startup must be checked,
AND the User/User reference is assigned a reference priority number other
than "1". Note that a Time jump and/or 1PPS jump are likely to happen 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 the previous page.
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 win-
dow, the checkbox Manual Time Set must be checked. The System Time dis-
played in the field below will become valid the moment the Submit button is
clicked.
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CHAPTER 3 • SecureSync 2400 User Manual Rev. 5.2
3.3 Managing References
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