10.1.4 Assignment of CF Segment in IEEE1344 Code
Bit No.
Designation
Description
49
Position Identifier P5
50
Year BCD encoded 1
51
Year BCD encoded 2
low nibble of BCD encoded year
52
Year BCD encoded 4
53
Year BCD encoded 8
54
empty, always zero
55
Year BCD encoded 10
56
Year BCD encoded 20
high nibble of BCD encoded year
57
Year BCD encoded 40
58
Year BCD encoded 80
59
Position Identifier P6
60
LSP - Leap Second Pending
set up to 59s before LS insertion
61
LS - Leap Second
0 = add leap second, 1 = delete leap second
1.)
62
DSP - Daylight Saving Pending
set up to 59s before daylight saving changeover
63
DST - Daylight Saving Time
set during daylight saving time
64
Timezone Offset Sign
sign of TZ offset 0 = ’+’, 1 = ’-’
65
TZ Offset binary encoded 1
66
TZ Offset binary encoded 2
Offset from IRIG time to UTC time.
67
TZ Offset binary encoded 4
Encoded IRIG time plus TZ Offset equals UTC at all times!
68
TZ Offset binary encoded 8
69
Position Identifier P7
70
TZ Offset 0.5 hour
set if additional half hour offset
71
TFOM Time figure of merit
72
TFOM Time figure of merit
time figure of merit represents approximated clock error.
2.)
73
TFOM Time figure of merit
0x00 = clock locked, 0x0F = clock failed
74
TFOM Time figure of merit
75
PARITY
parity on all preceding bits incl. IRIG-B time
1.) current firmware does not support leap deletion of leap seconds
2.) TFOM is cleared, when clock is synchronized first after power up. see chapter Selection of generated
timecode
24
Date: 28th March 2018
GPS180PEX
