Spectracom SecureSync 1200 User Reference Manual page 422

APPENDIX
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 con
figurations are:
The available options will vary according to the configurations of Format and Mod
ulation Type.
It is recommended that the SecureSync administrator/operator only use this if they do not know
what the IRIG Input Format is, and they wish to identify the signal type, or to determine if a sig
nal is present.
Local Clock : The incoming IRIG 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 cre
ated Local Clock. The Time Zone and DST rules, as configured in the Local Clock will be
applied to the front panel time display.
406
SBS = Straight Binary Seconds
The available options will vary according to the configurations of Format and
Modulation Type.
Fields conform to RCC 200-04 : IRIG spec 200-04 specified a location for year
value, if included in this field.
Fields conform to IEEC 37.118-2005 (IEEE 1344): Control Field contains year,
leap second and daylight savings time information.
Fields conform to Spectracom Format : Year is included in Control Field but not in
the same location as RCC-2004 output (year is offset by one position).
Fields conform to Spectracom FAA Format : A unique IRIG output Control Field
that contains satellite lock status and time error flags.
Fields conform to NASA Formats : Variants of IRIG B
Fields confirm to Spectracom IEEE C37.118-2005 : Has been extended to support
one-month leap second notification
Note: If the Format value is changed, the Control Field and Coded Expression
change to the default values for the given Format value. The user can only change
the Control Field field and Coded Expression field to allowed values for the
Format field.
SecureSync User Reference Guide