UTC: Coordinated Universal Time (Temps Universel Coordonné); your
local time zone determines the difference between UTC and local
time.
Note that UTC is not a time zone, but a time standard, i.e. it is not used
anywhere in the world as the official local time, whereas GMT (Green-
wich Mean Time) is a time zone that is used in several European and
African countries as the official local time.
TAI: International Atomic Time (Temps Atomique International).
The TAI time scale is based on the SI second and is not adjusted for
leap seconds. As of 15-February-2021, TAI is ahead of UTC by37
seconds. TAI is always ahead of GPS by 19 seconds.
GPS: The Global Positioning System time is the timescale maintained
by the GPS satellites.
Global Positioning System time is the time scale maintained by the GPS
satellites. The time signal is provided by atomic clocks in the GPS
ground control stations. The UTC–GPS offset as of 15-February-2021
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 Setting the Time" on
page171.
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 inter-
national 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 timescale 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).
3.2 System Time
CHAPTER 3 • SecureSync 2400 User Manual Rev. 2
169
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