Spectracom PRISMA VelaSync User Manual page 222

APPENDIX
Figure 5-1:
The IRIG B code contains the Binary Coded Decimal (BCD) time of year, Control Function (CF)
field and the Straight Binary Seconds time of day. The following figure illustrates the IRIG B
data structure. The BCD time of year provides the day of the year, 1-366, and the time of day
including seconds. The hour of the day is expressed in 24 hour format. The SBS time is the num-
ber of seconds elapsed since midnight. The Control Function field contains year information
and a time synchronization status bit.
1.
Time frame: 1.0 seconds.
2.
Code digit weighting:
210
IRIG B time code description
A.
Binary Coded Decimal time-of-year.
Code word - 30 binary digits.
Seconds, minutes hours, and days.
Recycles yearly.
B.
Straight Binary Seconds time-of-day.
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