Safran VersaSync - Page 390

Format Encoding Modulation Carrier Coded Expressions Bit rate
Time Frame
Interval
IRIG-G G001 DCLS N/A BCD
TOY
, CF 10000
pps
10 msec
IRIG-G G002 DCLS N/A BCD
TOY
10000
pps
10 msec
IRIG-G G005 DCLS N/A BCD
TOY
, BCD
YEAR
,
and CF
10000
pps
10 msec
IRIG-G G006 DCLS N/A BCD
TOY
, BCD
YEAR
10000
pps
10 msec
IRIG-G G141 AM 100 kHz BCD
TOY
, CF 10000
pps
10 msec
IRIG-G G142 AM 100 kHz BCD
TOY
10000
pps
10 msec
IRIG-G G145 AM 100 kHz BCD
TOY
, BCD
YEAR
,
and CF
10000
pps
10 msec
IRIG-G G146 AM 100 kHz BCD
TOY
, BCD
YEAR
10000
pps
10 msec
NASA-36
NASA-
36
N/A AM 1msec UNKNOWN 100 pps 1 sec
NASA-
36
N/A DCLS 10msec UNKNOWN 100 pps 1 sec
The Spectracom IRIG formats use the control functions for BCD year information
and a Time Sync Status bit and in format E the control functions are used for
straight binary seconds (SBS). Refer to individual IRIG Time Code description fig-
ures and text. IRIG Standard 200-98 format B had 27 control bits and format E
had 45 bits for control functions. These control bits could be used for any use and
there was no defined function. Spectracom used the control function element at
index count 55 as the TIME SYNC STATUS and the sub-frame after position iden-
tifiers P6 and P7 as the year info and for format E the sub-frame after P8 and P9
for the straight binary seconds (SBS). The position of the BCD year information
does not conform to the newer IRIG Standard 200-04. IRIG Standard 200-04
incorporated the year information after P5 and reduced the allocated control bits
to 18 for format B and 36 for format E.
376 VersaSync User Manual
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