CHAPTER ONE
Table One
Control Function Bit Assignments
IRIG B
Positive ID
Control
Bit #
Designation Explanation
P50 1 Year, BCD 1 Last two digits of year in BCD.
P51 2 Year, BCD 2 IBID.
P52 3 Year, BCD 4 IBID.
P53 4 Year, BCD 8 IBID.
P54 5 Not Used Unassigned.
P55 6 Year, BCD 10 Last two digits of year in BCD.
P56 7 Year, BCD 20 IBID.
P57 8 Year, BCD 40 IBID.
P58 9 Year, BCD 80 IBID.
P59 N/A P6 Position identifier number six.
P60 10 Leap Second Pending
(LSP)
Becomes 1 up to 59 s BEFORE leap second
insert.
P61 11 Leap Second (LS) 0 = add leap second, 1 = delete leap second.
P62 12 Not Used
P63 13 Not Used
P64 14 Time Offset Sign Time offset sign 0 = +, 1 = -
P65 15 Time Offset - Binary 1 Offset from coded IRIG B time to UTC time.
P66 16 Time Offset - Binary 2 IRIG coded time plus time offset (including
P67 17 Time Offset - Binary 4 sign) equals UTC time at all times (offset will
change during daylight savings).
P68 18 Time Offset - Binary 8
P69 N/A P7 Position identifier number.
P70 19 Time Offset - 0.5 Hour 0 = none, 1 = additional 0.5 h time offset
P71 20 Time Quality 4 bit code representing approx. clock time error
P72 21 Time Quality 0000 = clock locked, maximum accuracy.
P73 22 Time Quality 1111 = clock failed, data unreliable.
P74 23 Time Quality
P75 24 PARITY Parity on all preceding data bits.
P76 25 Not Used Unassigned.
P77 26 Not Used Unassigned.
P78 27 Not Used Unassigned.
P79 N/A P8 Position identifier number eight.
1-18 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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