Spectracom SecureSync 1200 User Reference Manual page 440

APPENDIX
Use of Time Fault Discrete : There are two options:
Use of Bit Synchronization (BS) : There are two options:
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:
424
Enabled : The TFD input signal is used to validate the STANAG input.
Disabled (default): The TFD input signal is ignored.
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 con
figuration of TOD2 is superseded and only used for BS.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.
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 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.
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
SecureSync User Reference Guide