Technical information

Assignment of CF Segment in IEEE1344 Code
127
Bit No. Designation Description
49 Position Identifier P5
50 Year BCD encoded 1
low nibble of BCD encoded year
51 Year BCD encoded 2
52 Year BCD encoded 4
53 Year BCD encoded 8
54 empty, always zero
55 Year BCD encoded 10
high nibble of BCD encoded year
56 Year BCD encoded 20
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
Offset from IRIG time to UTC time.
Encoded IRIG time plus TZ Offset equals UTC
at all times !
66 TZ Offset binary encoded 2
67 TZ Offset binary encoded 4
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
time figure of merit represents approximated
clock error.
2.)
0x00 = clock locked
0x0F = clock failed
72 TFOM Time figure of merit
73 TFOM Time figure of merit
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