Spectracom SecureSync User Reference Manual page 370

5.4 Time Code Option Cards
Level of Single-ended Signals : 10 V or 5V can be selected for the TOD 1 and 1PPS Out-
put.
Generate Time Fault Discrete (TFD) :
Threshold to activate TFD : If the TFD is activated, the user can select the TFOM value
threshold. Below this value, the TFD is high, otherwise the TFD is low.
Generate Bit Synchronization (BS) :
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:
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.
Configurable settings for each Time of Day are:
Signature Control : Used to control when the signal will be present. This function allows
the modulation to stop under certain conditions, see also "Signature Control" on page 201.
TOD Format : The user-selectable format to be used. Available formats include:
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Enabled: The TFD signal uses the "Threshold to activate" value to provide the level
of TFD.
Disabled: The TFD signal is always valid.
Enabled : The second STANAG signal (TOD 2) is used to send the BS (Bit Stream)
signal used with STANAG 4430-STM. When BS is active, the configuration of TOD
2 is superseded and only used for BS.
Disabled : The second STANAG signal (TOD 2) can be used to send an independent
TOD.
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.
STANAG 4246 HQI
STANAG 4246 HQII
STANAG 4372 HQIIA
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5 SecureSync User Reference Guide Rev. 18