Spectracom SecureSync 1200 User Reference Manual page 436

APPENDIX
Level of Single-ended Signals : 10 V or 5V will be indicated for the TOD 1 and 1PPS Out
put.
Generate Time Fault Discrete (TFD) :
Threshold to activate TFD : If the TFD is activated, indicates the TFOM value threshold.
Below this value, the TFD is high, otherwise the TFD is low.
Generate Bit Synchronization (BS) :
Timescale : Indicates the time base for the incoming time code data. The entered Times
cale 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
configured 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
for more information on Local Clocks.
For each Time of Day the following settings are displayed:
Signature Control : Indicates when the signal is present. This function allows the mod
ulation to stop under certain conditions, see "Signature Control" on page 136.
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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TOD 2 is superseded and only used for BS.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 inde
pendent 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
Management Screen" on page 140 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.
SecureSync User Reference Guide