Irig Standards And Specifications; Irig Carrier Frequencies - Spectracom SecureSync User Reference Manual

z
ZZ
m
CC
FF
CR
LF
8.2

IRIG Standards and Specifications

8.2.1

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 gov-
ernment associated. Today, IRIG is commonly used to synchronize voice loggers, recall record-
ers, and sequential event loggers found in emergency dispatch centers and power utilities.
Format Encoding Modulation Carrier
IRIG-A A000
IRIG-A A001
IRIG-A A002
IRIG-A A003
IRIG-A A004
SecureSync User Reference Guide
The sign of the offset to UTC, + implies time is ahead of UTC
The magnitude of the offset to UTC in units of half-hours.
If ZZ = 0, then z = +
Time mode character, is one of:
G = GPS
L = Local
U = UTC
T = TAI
The current leap seconds
The future leap seconds, which will show a leap second pending
24 hours in advance
Carriage Return
Line Feed
Coded Expressions
IRIG-A
DCLS N/A BCD
DCLS N/A BCD
DCLS N/A BCD
DCLS N/A BCD
DCLS N/A BCD
and SBS
Bit rate
, CF and SBS 1000
TOY
pps
, CF 1000
TOY
pps
1000
TOY
pps
, SBS 1000
TOY
pps
, BCD , CF 1000
TOY YEAR
pps
APPENDIX
Time Frame
Interval
0.1 sec
0.1 sec
0.1 sec
0.1 sec
0.1 sec
487