Spectracom VelaSync 1232 User Manual page 239

Figure 5-1:
IRIG B time code description
The IRIG B code contains the Binary Coded Decimal (BCD) time of year, Control Func-
tion (CF) field and the Straight Binary Seconds time of day. The following figure illus-
trates 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 number 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:
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.
VelaSync User's Manual
APPENDIX
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