Spectracom SecureSync 1200 User Reference Manual page 553

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
P (3 for seconds; 7 for minutes; 6 for hours; 10 for days) until the code word is complete. An
5
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
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.
50 1
51 2
52 3
53 4
54 5
55 6
56 7
57 8
58 9
59 PID P6
60 10
61 11
62 12
63 13
64 14
65 15
66 16
SecureSync User Reference Guide
FUNCTION
SPACE
SPACE
SPACE
SPACE
SPACE
TIME SYNC_STATUS
SPACE
SPACE
SPACE
POSITION IDENTIFIER
YEAR UNITS Y1
YEAR UNITS Y2
YEAR UNITS Y4
YEAR UNITS Y8
SPACE
YEAR TENS Y10
YEAR TENS Y20
0
and P . Any control function
5 0
APPENDIX
and
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