Symmetricom ET6000, Руководство пользователя

Страница: 126 / 206

OPTION DESCRIPTIONS
1.3 OUTPUT FORMATS
1.3.1 IRIG FORMAT A
P5 P6 P7
50
Time Frame = 0.1 Second
60 70 80 90
1.0 mS (Element Rate = 1000 PPS)
P8 P9
Time of Day
(Straight Binary Seconds)
0
P0 PR
Reference Marker = 0.8 mS
Time = 091 Days : 14 Hours : 08 Minutes : 32.8 Seconds
Binary One = 0.5 mS
Binary Zero = 0.2 mS
Reference = 0.8 mS
P0 PR 1
2
4 8 10 20 40
Seconds Minutes Hours
BCD Time of Year
0
10 20
P1 P2 1 2 4
8
10 20 40 1 2 4 8 10 20 1
2
4
8
10 20 40 P3
30
40 50
Time Frame = 0.1 Second
80 P4 100 200 P5
Days
0.1 Sec
1
2
4 8
Control Functions
2 0 2 1 2 2 2 3
2
4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16
•
Time Frame : 0.1 second. Code Digit Weighting Options : BCD, SB, or both.
•
Binary Coded Decimal Time-of-Year CODE WORD - 34 binary digits.
Seconds, minutes, hours, days, and 0.1 seconds. Recycles yearly.
•
Straight Binary Time-of-Day CODE WORD - 17 binary digits.
Seconds only. Recycles each 24 hours (86399).
Code Word Structure: BCD
Word begins at INDEX COUNT 1. Binary coded elements occur between POSITION
IDENTIFIER ELEMENTS (seven for seconds, seven for minutes, six for hours, ten for days, and
four for 0.1 seconds) until the CODE WORD is complete. A POSITION IDENTIFIER occurs
between decimal digits in each group to provide separation for visual resolution.
Code Word Structure: SB
Word begins at INDEX COUNT 80. Seventeen binary-coded elements occur, with a POSITION
IDENTIFIER between the 9
th
and 10
th
binary-coded elements.
Least Significant Digit
Occurs first, except for fractional seconds information, which occurs following the day-of-year
information.
Element Rates Available
•
1000 per second (basic element rate).
•
100 per second (POSITION IDENTIFIER rate).
•
10 per second (frame rate).
Symmetricom Inc ET6 ExacTime GPS TC & FG (Rev C) C-5