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 inadvertently
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 testing 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 synchronize
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 checkbox Synchronize to Bat-
tery 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 page187.
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.
3.3 Managing References
CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
189
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