Assignment Of Cf Segment In Ieee1344 Code - Meinberg LANTIME/GPS Operating Instructions Manual

Assignment of CF Segment in IEEE1344 Code

Bit No. Designation
49 Position Identifier P5
50 Year BCD encoded 1
51 Year BCD encoded 2
52 Year BCD encoded 4
53 Year BCD encoded 8
54 empty, always zero
55 Year BCD encoded 10
56 Year BCD encoded 20
57 Year BCD encoded 40
58 Year BCD encoded 80
59 Position Identifier P6
60 LSP - Leap Second Pending
61 LS - Leap Second
62 DSP - Daylight Saving Pending
63 DST - Daylight Saving Time
64 Timezone Offset Sign
65 TZ Offset binary encoded 1
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
71 TFOM Time figure of merit
72 TFOM Time figure of merit
73 TFOM Time figure of merit
74 TFOM Time figure of merit
75 PARITY
current firmware does not support leap deletion of leap seconds
1.)
TFOM is cleared, when clock is synchronized first after power up. see chapter Selection of generated timecode
2.)
Description
low nibble of BCD encoded year
high nibble of BCD encoded year
set up to 59s before LS insertion
0 = add leap second, 1 = delete leap second
set up to 59s before daylight saving changeover
set during daylight saving time
sign of TZ offset 0 = '+', 1 = '-'
Offset from IRIG time to UTC time.
Encoded IRIG time plus TZ Offset equals UTC
at all times !
set if additional half hour offset
time figure of merit represents approximated
clock error.
2.)
0x00 = clock locked
0x0F = clock failed
parity on all preceding bits incl. IRIG-B time
117
1.)