ARINC 724B-6 : 2012

1.0 Introduction
1.1 Purpose of this Document
1.2 Airborne Sub System Configuration
1.3 Interchangeability
1.4 Regulatory Approval
2.0 Interchangeability standards
2.1 Introduction
2.2 Form Factors, Connectors, and Index Pin Coding
2.3 Standard Interwiring
2.4 Primary Power Input
2.5 Signal Characteristics
2.6 Environmental Conditions
2.7 Cooling
2.8 Grounding and Bonding
2.9 Standardized Signaling
3.0 System design
3.1 Introduction
4.0 Management unit design
4.1 Decoding
4.2 Synchronization
4.3 Uplink Preamble Processing
4.4 Uplink BCS Check
4.5 Input/Output Interfaces
4.6 Universal Coordinated Time (UTC) Clock
4.7 MU Discrete Inputs and Outputs
4.8 Downlink Message Formats
4.9 Messages to Which CRC Applies
5.0 Provisions for automatic test equipment
5.1 General
5.2 Unit Identification
5.3 Use of ATLAS Language
ATTACHMENT 1-1 - SINGLE ACARS AIRBORNE
                 SUBSYSTEM BLOCK DIAGRAM
ATTACHMENT 1-2 - EXAMPLE DUAL ACARS AIRBORNE
                 SUBSYSTEM BLOCK DIAGRAM
ATTACHMENT 1-3 - MULTIPLE AIR/GROUND INSTALLATION
ATTACHMENT 2-1 - STANDARD INTERWIRING
ATTACHMENT 2-2 - NOTES APPLICABLE TO THE STANDARD
                 INTERWIRING
ATTACHMENT 2-3 - CONNECTOR INSERT LAYOUT
ATTACHMENT 3 - ENVIRONMENTAL TEST CATEGORIES
ATTACHMENT 4 - FREQUENCY CONTROLS
ATTACHMENT 5 - SERIAL DIGITAL CHANNEL SELECTION
ATTACHMENT 6 - DIGITAL WORD FORMAT
APPENDIX A - ACRONYMS