Irig Standards And Specifications; About The Irig Output Resolution; Irig Carrier Frequencies - Safran VersaSync User Manual

APPENDIX
5.4

IRIG Standards and Specifications

5.4.1

About the IRIG Output Resolution

The IRIG output signals are generated from VersaSync'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 typically being the most accurate ref-
erence for the system to sync with).
IRIG AM synchronization of a device to its IRIG source is typically measured in the
tens of microseconds, while synchronization using a IRIG DCLS signal can typ-
ically provide around 100 nanoseconds or so (plus the cable delays between Ver-
saSync and the other device, as well as the processing delays of the other system
itself).
IRIG AM functionality is available through an option card.
Note that all IRIG outputs has its own available 'offset' capability, which is con-
figurable via VersaSync's Web UI, to help account for cabling and processing
delays of the device each output is connected with.
5.4.2

IRIG Carrier Frequencies

Each IRIG code specifies a carrier frequency that is modulated to encode date
and time, as well as control bits to time-stamp events. Initially, IRIG applications
were primarily military and government associated. Today, IRIG is commonly
used to synchronize voice loggers, recall recorders, and sequential event loggers
found in emergency dispatch centers and power utilities.
372
. Period Separator
XXXXXXXXX 9-digit Sub-Seconds Time (5 ns res-
olution)
CR Carriage Return
LF Line Feed
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