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Standard 200-98 format B had 27 control bits and format E had 45 bits for control func-

tions. These control bits could be used for any use and there was no defined function. Spec-

tracom used the control function element 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 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.

Note: DCLS is DC Level Shifted output, pulse width modulated with a pos-

ition 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 of the bit rate and a binary zero (0) having a positive pulse width

equal to 0.2 of the reciprocal of the bite rate.

VersaSync can provide IRIG A, IRIG B, IRIG E and IRIG G code in amplitude modulated (AM)

or pulse width coded (TTL) formats. A signature control feature may be enabled for any

IRIG output. Signature control removes the modulation code when a Time Sync Alarm is

asserted.

5.4.3 IRIG B Output

The IRIG B Time Code description follows.

VersaSync User Manual 333

APPENDIX

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