in the GPS ground control stations. The UTC–GPS offset as of
22-August-2023 is 18 seconds.
For more information on Timescales, see "Timescales" below.
4.
If you want to override the system time with a manually set User Time,
check the Manual Time Set checkbox. For information, see "Manually Set-
ting the Time" on the facing page.
5.
Click Submit to update the System Time and close the window.
3.2.1.2 Timescales
The System Time can be configured to operate in one of several timescales, such
as UTC, GPS and TAI (Temps Atomique International). These timescales are
based on international time standards, and are offset from each other by varying
numbers of seconds.
When configuring SecureSync, in most cases, UTC will be the desired timescale
to select.
Note: UTC timescale is also referred to as “ZULU” time. GPS times-
cale is the raw GPS time as transmitted by the GNSS satellites (in
2018 the GPS time is currently 18 seconds ahead of UTC time. UTC
timescale observes leap seconds while GPS timescale does not).
Note: The TAI timescale also does not observe leap seconds. The TAI
timescale is fixed to always be 19 seconds ahead of GPS time. As of
22-August-2023 TAI time is 37 seconds ahead of UTC.
SecureSync's System timescale is configured via the MANAGEMENT > OTHER:
Time Management screen, see "System Time" on page188.
Input timescales
Some of the inputs may not necessarily provide time to SecureSync in the same
timescale selected in the System Time’s timescale field. These inputs have
internal conversions that allow the timescale for the inputs to also be inde-
pendently defined, so that they don’t have to be provided in the same timescale.
For example, the System timescale can be configured as “UTC”, but the IRIG
input data stream can provide SecureSync with “local” time, with no time jumps
occurring when the reference is selected.
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CHAPTER 3 • SecureSync 2400 User Manual Rev. 5.2
3.2 System Time
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