Orolia SecureSync 2400 User Manual

Figure 5-63: FAA modified IRIG B
Notes
The beginning of each 1.0 second time frame is identified by two consecutive 8.0ms ele-
ments (P
0
and P
8
). The leading edge of the second 8.0ms element (P
R
) is the "on time"
reference point for the succeeding time code. 10pps position identifiers P
0
, P
1
, ..... P
8
(8.0
ms duration) occur 10ms before 10pps "on time" and refer to the leading edge of the suc-
ceeding element.
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 2.0ms, and the bin-
ary "one" has a duration of 5.0 ms. The leading edge is the 100pps "on time" reference
point for all elements.
The binary coded decimal (BCD) time-of-year code word consists of 30 digits beginning at
index count 1. The binary coded subword elements occur between position identifiers P
0
and P
5
(7 for seconds; 7 for minutes; 6 for hours; 10 for days) until the code word is com-
plete. An index marker occurs between the decimal digits in each subword to provide sep-
aration for visual resolution. The least significant digit occurs first. The BCD code recycles
yearly.
Twenty-seven control functions occur between position identifiers P
5
and P
8
. FAA uses
this field to communicate satellite lock status and time error and indicators. The first flag
element is at 530ms which indicates satellite lock. The ±1ms error flag occurs at 550ms.
The ±5ms error flag occurs at 560 ms. The ±50ms error flag occurs at 570ms. The
±500ms error flag occurs at 580ms.
SecureSync 2400 User Manual 557
APPENDIX

Orolia SecureSync 2400 Specifications

General

Brand	Orolia
Model	SecureSync 2400
Category	Recording Equipment
Language	English