Element 56 (560 ms) is the ±5.0 millisecond error flag. Element 56 is set to Binary
1 when the expected time error is within +/- 5.0 milliseconds. and a Binary 0 dur-
ing all other conditions of operation.
Element 57 (570 ms) is the ±50 millisecond error flag. Element 57 is set to Binary
1 when the expected time error is within +/- 50 milliseconds, and a Binary 0 dur-
ing all other conditions of operation.
Element 58 (580 ms) is the ±500 millisecond error flag. Element 58 is set to Bin-
ary 1 when the expected time error is within ±500 milliseconds, and a Binary 0
during all other conditions of operation.
Table 5-30:
FAA Time Error Indicators
Time Since Loss of Lock Status/Error
Lock Indic-
ator
±1ms ±5ms ±50ms ±500ms
N/A Locked Error < 2μs 1 0 0 0 0
< 00:16:40 Unlocked Error < 1ms 0 1 0 0 0
00:16:41 to 01:23:39 Unlocked Error < 5ms 0 0 1 0 0
01:23:40 to 13:53:19 Unlocked Error < 50 ms 0 0 0 1 0
13:53:20 to 5 days
18:53:19
Unlocked Error < 500
ms
0 0 0 0 1
>5 days 18:53:20 Unlocked Error
Unknown
0 0 0 0 0
N/A Power On 0 0 0 0 0
Figure 5-67: FAA modified IRIG B
SecureSync User Reference Guide 553
APPENDIX
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