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2.19 Configuring Input References
168
Format: Sets the formatting of the IRIG input signal, as defined by the IRIG
generator time source. The available choices are:
IRIG A
IRIG B
IRIG G
NASA-36
Modulation
Type: Configures the type of input signal modulation. The
choices are:
IRIG DCLS—A TTL (Phase) modulated signal.
Frequency: The IRIG modulation frequency. This is determined by the con-
figuration of Format and Modulation Type. See
on page 588
for details.
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
The available options will vary according to the configurations of
Format and Modulation Type.
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:
Fields conform to
ation for year value, if included in this field.
Fields conform to
tains year, leap second and daylight savings time information.
Fields conform to
Field but not in the same location as RCC-2004 output (year is offset
by one position).
Fields conform to
Control Field that contains satellite lock status and time error flags.
Fields conform to
Fields confirm to
ded to support one-month leap second notification
RCC
200-04: IRIG spec 200-04 specified a loc-
IEEC 37.118-2005
(IEEE 1344): Control Field con-
Spectracom
Format: Year is included in Control
Spectracom FAA
Format: A unique IRIG output
NASA
Formats: Variants of IRIG B
Spectracom IEEE
C37.118-2005: Has been exten-
CHAPTER
2
"IRIG Carrier Frequencies"
•
SecureSync 2400 User Manual Rev. 5.2
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