Spectracom SecureSync User Reference Manual page 377

The incoming input time information may be provided as local time, but System Time may be con-
figured as UTC time, so internal computations need to be performed. With the Timescale field set
to "Local", select the name of a previously created Local Clock. The Time Zone and DST rules, as
configured in the Local Clock will be applied to the front panel time display. Refer to "Setting up a
Local Clock" on page 175 for more information on Local Clocks.
Under Time of Day Inputs , for each Time of Day:
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Use of Time Fault Discrete : There are two options:
Enabled : The TFD input signal is used to validate the STANAG input.
Disabled (default): The TFD input signal is ignored.
Use of Bit Synchronization (BS) : There are two options:
Enabled : The second STANAG input (TOD 2) is used to receive the BS (Bit
Stream) signal used with STANAG 4430-STM. When BS is active, the configuration
of TOD2 is superseded and only used for BS.
Disabled : The second STANAG input (TOD 2) can be used to receive an inde-
pendent TOD.
Timescale : Used to select the time base for the incoming time code data. The entered
Timescale is used by the system to convert the time in the incoming data stream to UTC
time for use by the System Time. The available choices are:
UTC : Coordinated Universal Time ("temps universel coordonné"), also referred to as
ZULU time
TAI : Temps Atomique International
GPS : The raw GPS time as transmitted by the GNSS satellites (as of July, 2015,
this is 17 seconds ahead of UTC time).
A local clock set up through the Time Management Page: Refer to "The Time Man-
agement Screen" on page 168 for more information on how to configure and read the
System Time. Local timescale allows a Local Clock to apply a time offset for Time
Zone and DST correction.
Reference Selection : Selects TOD 1 or TOD 2 (configured below) which TOD signal is
used for synchronization.
Format : The user-selectable format to be used. Available formats include:
STANAG 4246 HAVE QUICK I
STANAG 4246 HAVE QUICK II
STANAG 4372 HAVE QUICK IIA
STANAG 4430 Extended HAVE QUICK
STANAG 4430 Standard Time Message (STM)
ICD-GPS-060A BCD Time Code
5.4 Time Code Option Cards
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