Safran SecureSync 2400 User Manual page 554

APPENDIX
538
Frequency: If AM modulation is chosen above, the frequency is offered.
Otherwise No Carrier
Coded Expression: Defines the data structure of the IRIG signal, where:
BCD = Binary Coded Decimal
TOY = Time of Year
CF = Control Field
SBS = Straight Binary Seconds
Control Function Field: IRIG signals have an optional section in the data
stream that can be used to include additional information (such as the
present year, for example). This field allows the Control Field section of the
IRIG output to be defined. The available configurations are as follows:
RCC-2004: IRIG spec 200-04 specified a location for year value, if
included in this field.
IEE 1344 (C37.118-2005): IRIG B format with extensions. Control Field
contains year, Leap Second and DST information.
Spectracom Format: Year is included in Control Field but not in the
same location as RCC-2004 output (year is offset by one position).
Spectracom FAA
contains satellite lock status and time error flags.
NASA: A variant of IRIG B.
Time Scale: 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 avail-
able 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)
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
is displayed.
Format: A unique IRIG output Control Field that
SecureSync 2400 User Manual