Use Cases
Using the Battery Backed Time on Startup is typically used in these cases:
a.
If the synchronization state is to be reached as quickly as possible, even if this means
the time distributed initially will most likely be less accurate than an external time ref-
erence.
b.
A system is intended to operate autonomously (i.e. without any external references)
and
the hand-set time entered manually during commissioning of the system is suf-
ficiently accurate
the system needs to be able to completely recover from a temporary power
loss, or similar, without human intervention.
c.
A system is used for simulation or testing purposes, and UTC traceability is not
required.
The Accuracy of the Battery Backed Time …
… depends on the accuracy of the hand-set time if the time is set manually in an autonom-
ous system. In a non- autonomous system (i.e, when using external reference (s))
SecureSync's System Clock will regularly update the battery-backed time.
Another factor impacting the accuracy of the battery- backed time is how long a
SecureSync unit is powered off: Any significant amount of time will cause the battery-
backed RTC to drift, i.e. the battery-backed time will become increasingly inaccurate.
The battery used for the RTC is designed to last for the lifetime of the product.
Distributing battery-backed time over NTP
When distributing a hand-set, battery backed time via NTP, please set the time relatively
close to UTC, so as to prevent NTP synchronization problems when transitioning from the
hand-set time to a UTC-based external input reference. See also "Input Reference Pri-
orities" on page183.
To use the battery-backed time as the synchronized time at start-up:
1.
Navigate to MANAGEMENT > OTHER: Time Management.
2.
In the System Time panel click the GEAR icon.
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CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
3.2 System Time
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