Spectracom SecureSync 1200 User Reference Manual page 543

Format Encoding Modulation
IRIG-G G001
IRIG-G G002
IRIG-G G005
IRIG-G G006
IRIG-G G141
IRIG-G G142
IRIG-G G145
IRIG-G G146
NASA- N/A
36
NASA- N/A
36
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 figures 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 ele
ment at index count 55 as the TIME SYNC STATUS and the sub-frame after position identifiers
P6 and P7 as the year info and for format E the sub-frame after P8 and P9 for the straight bin
ary 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.
Note:
identifier having a positive pulse width equal to 0.8 of the reciprocal of the bit
rate, a binary one (1) having a positive pulse width equal to 0.5 of the reciprocal
SecureSync User Reference Guide
Carrier
DCLS N/A BCD
DCLS N/A BCD
DCLS N/A BCD
DCLS N/A BCD
AM 100 BCD
kHz
AM 100 BCD
kHz
AM 100 BCD
kHz
AM 100 BCD
kHz
AM 1msec UNKNOWN
DCLS 10 msec UNKNOWN
DCLS is DC Level Shifted output, pulse width modulated with a position
Coded Expressions Bit rate
, CF 10000
TOY
pps
10000
TOY
pps
, BCD , and CF 10000
TOY YEAR
pps
, BCD 10000
TOY YEAR
pps
, CF 10000
TOY
pps
10000
TOY
pps
, BCD , and CF 10000
TOY YEAR
pps
, BCD 10000
TOY YEAR
pps
100 pps
100 pps
APPENDIX
Time Frame Inter
val
10 msec
10 msec
10 msec
10 msec
10 msec
10 msec
10 msec
10 msec
1 sec
1 sec
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