Spectracom SecureSync User Reference Manual page 359

Time and frequency synchronization system
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The Edit window allows the configuration of the following settings:
CHAPTER
5
SecureSync User Reference Guide Rev. 18
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.
IRIG AM—An amplitude modulated signal.
Frequency : The IRIG modulation frequency. This is determined by the configuration of
Format and Modulation Type. See "IRIG Carrier Frequencies" on page 487 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 Mod-
ulation 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
5.4  Time Code Option Cards
343

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