Frequency: If AM modulation is chosen above, the frequency is offered. Otherwise
No Carrier is displayed.
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 con-
tains year, Leap Second and DST information.
Spectracom Format: Year is included in Control Field but not in the same loc-
ation as RCC-2004 output (year is offset by one position).
Spectracom FAA Format: A unique IRIG output Control Field that 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 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)
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 "Local Clock
(s), DST" on page179). Local timescale allows a Local Clock to apply a time
offset for Time Zone and DST correction.
498 SecureSync 2400 User Manual
APPENDIX
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