The time code word and the control functions presented during the time frame are pulse-width
coded. The binary "zero" and index markers have a duration of 20ms, and the binary "one"
has a duration of 50ms. The leading edge is the 10 pps "on time" reference point for all ele
ments.
The binary coded decimal (BCD) time-of-year code word consists of 26digits beginning at
index count 6. The binary coded subword elements occur between position identifiers P
0
and
P
5
(3 for seconds; 7 for minutes; 6 for hours; 10 for days) until the code word is complete. An
index marker occurs between the decimal digits in each subword to provide separation for
visual resolution. The least significant digit occurs first. The BCD code recycles yearly.
Forty-five control functions occur between position identifiers P
5
and P
0
. Any control function
element for combination of control function elements can be programmed to read a binary
"one" during any specified number of time frames. Each control element is identified on the
Control Function Field Table.
Table 5-31:
IRIG E control function field
BIT No. CF ELEMENT No. FUNCTION
50 1 SPACE
51 2 SPACE
52 3 SPACE
53 4 SPACE
54 5 SPACE
55 6 TIME SYNC_STATUS
56 7 SPACE
57 8 SPACE
58 9 SPACE
59 PID P6 POSITION IDENTIFIER
60 10 YEAR UNITS Y1
61 11 YEAR UNITS Y2
62 12 YEAR UNITS Y4
63 13 YEAR UNITS Y8
64 14 SPACE
65 15 YEAR TENS Y10
66 16 YEAR TENS Y20
SecureSync User Reference Guide 537
APPENDIX
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