T Time Figure of Merit character (TFOM), limited to the range 6 to 9:
9 indicates error >±10 milliseconds, or unsynchronized condition
8 indicates error <±10 milliseconds
7 indicates error <±1 millisecond
6 indicates error <±100 microseconds
YYYY Year
DDD Day of Year (001-366)
HH Hour of the day (00-23)
: Colon Separator
MM Minutes of the hour
SS Seconds (00-59), (00-60 for leap second)
z The sign of the offset to UTC, + implies time is ahead of UTC
ZZ The magnitude of the offset to UTC in units of half-hours.
If ZZ = 0, then z = +
m Time mode character, is one of:
G = GPS
L = Local
U = UTC
T = TAI
CC The current leap seconds
FF The future leap seconds, which will show a leap second pending
24hours in advance
CR Carriage Return
LF Line Feed
5.5 IRIG Standards and Specifications
5.5.1 About the IRIG Output Resolution
The IRIG output signals are generated from SecureSync's System Time, which can be synced to
one or more external input references (such as GPS, IRIG, PTP, etc). The accuracy of the System
time to true UTC time is dependent upon what the selected external reference is (with GPS typ
ically being the most accurate reference for the system to sync with).
As for the four available IRIG outputs of the 1204-15 Option Card, outputting an IRIG DCLS
(Phase Modulation) signal provides much better and more accurate synchronization of another
SecureSync User Reference Guide 523
APPENDIX
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