Safran SecureSync 2400 User Manual page 608

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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.

DCLS is DC Level Shifted output, pulse width modulated with a

position 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

Coded Expres-

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