5.5.4
IRIG E Output
The
IRIG E
code contains the Binary Coded Decimal (BCD) time of year and Control Functions.
The figure IRIG E Time Code Description illustrates the IRIG E data structure. The BCD time of
year provides the day of year, 1-366, and time of day to tens of seconds. The hour of the day
is expressed in 24 hour format. The Control Function field includes a time synchronization
status bit, year information and SBS time of day.
Time frame
: 10 seconds.
Code Digit Weighting
:
Binary Coded Decimal time of year.
Code world - 26 binary digits.
Tens of seconds, minutes, hours, and days.
Recycles yearly.
Code Word Structure
: BCD word tens of seconds digits begin at index count 6. Binary
coded elements occur between position identifier elements P0 and P5 (3 for seconds, 7
for minutes, 6 for hours, and 10 for days) until the code word is complete. An index
marker occurs between decimal digits in each group to provide separation for visual res
olution. Least significant digit occurs first.
Control Functions
: IRIG formats reserve a set of elements known as Control Functions
(CF) for the encoding of various control, identification, or other special purpose func
tions. IRIG E has 45 Control Functions located between elements 50 and 98. The NetC
lock uses the Control Function field to encode year data, time synchronization status,
and SBS time data. Table B-2 lists the Control Function Field and each element's function.
Element 55 is the time synchronization status bit. Element 55 is a Binary 1 when the front panel
time synchronization lamp is green, and a Binary 0 when the lamp is red.
Year information consists of the last two digits of the current year (i.e. 98, 99, etc.). Elements 60
through 63 contain the binary equivalent of year units. Elements 65 through 68 contain the bin
ary equivalent of tens of years. In keeping with IRIG formats, the least significant bit occurs first.
Elements 80 through 97 are encoded with the Straight Binary Seconds (SBS) time data. The
SBS time data is incremented in 10-second steps and recycles every 24 hours.
Pulse rates:
Element rate: 10 per second.
Position identifier rate: 1 per second.
Reference marker rate: 1 per 10 seconds.
NetClock User Reference Guide
425
APPENDIX
Summary of Contents for NetClock 9400 Series
Page 2: ......
Page 4: ...Blank page II NetClock User Reference Guide...
Page 16: ...BLANK PAGE XIV NetClock User Reference Guide TABLE OF CONTENTS...
Page 42: ...BLANK PAGE 1 11 Regulatory Compliance 26 CHAPTER 1 NetClock User Reference Guide Rev 16...
Page 160: ...BLANK PAGE 2 17 Configuring Outputs 144 CHAPTER 2 NetClock User Reference Guide Rev 16...
Page 238: ...BLANK PAGE 3 5 Managing the Oscillator 222 CHAPTER 3 NetClock User Reference Guide Rev 16...
Page 462: ...BLANK PAGE 446 NetClock User Reference Guide...
