IRIG106 chapter 4

Telemetry Standards, IRIG Standard 106-11 (Part 1), Chapter 4, June 2011

CHAPTER 4

PULSE CODE MODULATION STANDARDS

TABLE OF CONTENTS

4.1 General .............................................................................................................. 4-1

4.8 Asynchronous Data Merge (Class II) .............................................................. 4-10

LIST OF FIGURES

Figure 4-1. PCM code definitions. ....................................................................................... 4-3

Figure 4-2. PCM frame structure. ........................................................................................ 4-5

Figure 4-3. 16 bit standardized time word format. ............................................................... 4-9

Figure 4-4. Time word insertion into 12 bit PCM word size. .............................................. 4-9

Figure 4-5. Asynchronous word structure. ......................................................................... 4-11

Figure 4-6 Overhead truth table. ....................................................................................... 4-11

Telemetry Standards, IRIG Standard 106-11 (Part 1), Chapter 4, June 2011

Telemetry Standards, IRIG Standard 106-11 (Part 1), Chapter 4, June 2011

4.1 General

Pulse code modulation (PCM) data are transmitted as a serial bit stream of binary-coded

time-division multiplexed words. When PCM is transmitted, premodulation filtering shall be

used to confine the radiated RF spectrum in accordance with Appendix A. These standards

define pulse train structure and system design characteristics for the implementation of PCM

telemetry formats. Additional information and recommendations are provided in Appendix C

and in RCC Document 119, Telemetry Applications Handbook.

4.2 Class Distinctions and Bit-Oriented Characteristics

The PCM formats are divided into two classes for reference. Serial bit stream

examples of class II characteristics.