Spectracom VersaSync - Signature Control

ICD-GPS-060A HQ
DOD-STD-1399 BCD
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 Management Screen" on page114 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.
Offset (ns): Provides the ability to account for STANAG Line (TOD1 and TOD2
independently) cable delays or other latencies in the STANAG output. Available
Offset range is –500 to +500ms in 5ns steps.
3.
Click Submit.
2.6.5 Signature Control
Signature Control is a user-set parameter that controls under which output states an output will
be present. This feature allows you to determine how closely you want to link an output to the
status of the active input reference e.g., by deactivating it after holdover expiration. It is also
offers the capability to indirectly send an input-reference-lost-alarm to a downstream recipient
via the presence of the signal.
E X A M P L E S :
You can setup Signature Control such that VersaSync's built in 1PPS output becomes disabled the
moment its input reference is lost (e.g., if a valid GNSS signal is lost).
Or, you can setup your output signal such that remains valid while VersaSync in holdover mode, but
not in free run.
The available options are:
I.
Output Always Enabled—The output is present, even if VersaSync is not synchronized to
its references (VersaSync is free running).
II.
Output Enabled in Holdover—The output is present unless VersaSync is not synchronized
to its references (VersaSync is in Holdover mode).
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CHAPTER 2 • VersaSync User Manual Rev. 6.0
2.6 Configuring Inputs/Outputs