Spectracom SecureSync User Reference Manual page 400

5.4 Time Code Option Cards
Format 3 : Selects the third consecutive format message to be outputted. Select "None" if
only one output format is desired. "None" will be the only choice available if Format 2 is
"None."
Signature Control : Signature Control controls when the selected ASCII data output format
will be present; see "Signature Control" on page 201.
Output Mode : This field determines when the output data will be provided. The available
Mode selections are as follows:
Time Scale : Used to select the time base for the incoming 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:
If GPS or TAI time is used, then the proper timescale offsets must be set on the
MANAGEMENT/OTHER/Time Management page. (See "The Time Management
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 cor-
rection.
384
Broadcast : The format messages are automatically sent out on authorized con-
dition (Signature control), every second a message is generated in sync with the
1PPS.
Request (On-time) : A format message is generated in sync with 1PPS after the
configured request character has been received.
Request (Immediate) : A format message is generated as soon as the request char-
acter is received. As this selection does not correlate the output data to the on-time
point for the message, in Data Formats that do not provide sub-second information
(such as Formats 0 and 1 whereas Format 2 provides sub-second information), it
should be noted that the output data can be provided immediately, but a time error
could occur when using the on-time point of the message in addition to the data for
timing applications.
NOTE – The choices available in this field are determined by the
choices of Format Group and Format.
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 currently 17 seconds ahead of UTC time).
A local clock set up through the Time Management Page: This option will appear
under the name of the local clock you have set up. See "Setting up a Local Clock" on
page 175 for more information. Local timescale allows a Local Clock to apply a time
CHAPTER •
5 SecureSync User Reference Guide Rev. 18