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
24hours 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 accur-
acy of the System time to true UTC time is dependent upon what the selected external ref-
erence is (with GPS typically being the most accurate reference 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 typically provide around
100 nanoseconds or so (plus the cable delays between SecureSync and the other device,
as well as the processing delays of the other system itself).
IRIGAMfunctionality is available through an option card.
Note that all IRIG outputs has its own available ‘offset’ capability, which is configurable via
SecureSync’s WebUI, to help account for cabling and processing delays of the device each
output is connected with.
5.5.2 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,
546 SecureSync 2400 User Manual
APPENDIX
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