Orolia Spectracom VelaSync 1232, User Manual

Page: 239 / 268

formats, the least significant bit occurs first. All unused Control Functions are filled
with a space (Binary 0).
SBS : Word begins at index count 80. Seventeen Straight Binary Coded elements
occur with a position identifier between the 9th and 10th binary coded elements.
Least significant digit occurs first.
Pulse rates:
Element rate: 100 per second.
Position identifier rate: 10 per second.
Reference marker rate: 1 per second.
Element identification: The "on time" reference point for all elements is the pulse
leading edge.
Index marker (Binary 0 or uncoded element): 2 millisecond duration.
Code digit (Binary 1): 5 millisecond duration.
Position identifier: 8 millisecond duration.
Reference marker, 1 per second. The reference marker appears as two consecutive
position identifiers. The second position identifier marks the on-time point for the
succeeding code word.
Resolution:
Pulse width coded signal: 10 milliseconds.
Amplitude modulated signal: 1 millisecond.
Carrier frequency: 1kHz when modulated.
Table 5-4:
IRIG B control function field
C.F. Element # Digit # Function
50 1 Space
51 2 Space
52 3 Space
53 4 Space
54 5 Space
55 6 Time Sync Status
56 7 Space
VelaSync 1232 User Manual 227
APPENDIX