ARINC 597A : 1986

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 System Functions and Signal Characteristics
  2.6 Environmental Conditions
  2.7 Cooling
  2.8 Grounding and Bonding
3.0 SYSTEM DESIGN
  3.1 General Description
  3.2 System Architecture
  3.3 Protocols
  3.4 Message Processing
  3.5 Management Unit Design
                 Figure 3
4.0 INTERFACES AND PROTOCOLS FOR LAYER 1 - THE
                 PHYSICAL LAYER
                 Introduction
  4.1 Functions and Services
5.0 SERVICES AND PROTOCOLS OF LAYER 2 - THE LINK
                 LAYER
                 Introduction
  5.1 Functions and Services
  5.2 Frame Structure
  5.3 Octet Structure
  5.4 Order of Bit Transmission
  5.5 Transparency
  5.6 Abort Sequence
  5.7 Flag Sequence
  5.8 Address Structure
  5.9 Control Field
  5.10 Check Sum
  5.11 Information Field
  5.12 Frame Check Sequency (FCS)
  5.13 List of Data Link System Parameters
6.0 SERVICES AND PROTOCOLS OF LAYER 3 - THE
                 NETWORK LAYER
                 Introduction
  6.1 Layer 3 Services
  6.2 Data Packet Structure
  6.3 Network Control Packets
  6.4 Acknowledgement Packets
  6.5 Packet Layer Description
  6.6 Transmitter and Receiver Overview
  6.7 Operational Variables, Constants and Timers
7.0 SERVICES AND PROTOCOLS OF LAYER 4 - THE
                 TRANSPORT LAYER
                 Introduction
  7.1 Transport Layer Services
  7.2 Transport Data-Unit Structure
  7.3 Transport General Format Identifier
  7.4 Transport Data-Unit Type
  7.5 Services Enhanced by Layer 4 with Other Layers
8.0 APPLICATION SERVICES - LAYERS 5-7
                 Introduction
  8.1 The Session Layer - Layer 5
  8.2 The Presentation Layer - Layer 6
  8.3 The Application Layer - Layer 7
9.0 APPLICATION MESSAGE FORMATS
                 Introduction
  9.1 Emergency Situation Report - Label 00 -
                 Version 1
  9.2 Weather Request - Label 5U - Version 1
  9.3 Temporary Suspension - Label 5P - Version 1
  9.4 Voice to Enhanced ACARS Channel Changeover -
                 Label Q6 - Version 1
10.0 SENSOR AND PERIPHERAL INTERFACES AND GMT CLOCK
  10.1 Input/Output Interfaces
  10.2 MU Discrete Inputs and Outputs
  10.3 GMT Clock
11.0 CONTROL UNIT (CU)
  11.1 Input Facilities
  11.2 Annunciators
  11.3 CU-to-MU Data Transfer
  11.4 Display Provisions
12.0 OPTIONAL AUXILIARY TERMINAL (OAT)
  12.1 General
  12.2 System Availability to the OAT
  12.3 Downlink Message Format
  12.4 Downlink Armed
  12.5 "No Communications" Alert
  12.6 Automatic Data Readouts via OAT
13.0 OPTIONAL PRINTER
  13.1 General
  13.2 Form Factor and Connector
  13.3 Primary Power Input
  13.4 Print Format
  13.5 Character Font
  13.6 Traffic Consumption Rate
  13.7 Buffer Storage
  13.8 Accuracy Checking
  13.9 Paper
  13.10 Functional Test
  13.11 Front Panel Controls and Indicators
  13.12 Alert Outputs
  13.13 Status Annunciation
  13.14 Noise
14.0 PROVISIONS FOR AUTOMATIC TEST EQUIPMENT
  14.1 General
  14.2 Unit Indentification
  14.3 Use of ATLAS Language
ATTACHMENTS
  1-1 Airborne Sub-System Block Diagram
  1-2 Management Unit Connector Positioning
  1-3 Control Unit Connector Positioning
  1-4 Control Unit Typical Panel Layout
  2 Standard Interwiring
                 Notes Applicable to the Standard Interwiring
  3 Environmental Test Categories
  4 System Timing and Frame Structure
  4-1 Information Transfer Frame with Three Octet
                 Address Field
  4-2 Supervisory Command/Response Frame with Eight
                 Octet Address Field
  5 American Standard Code for Information
                 Interchange
  6 Encoded Sub-Carrier Waveform
  7 Voice/ACARS RF Channel Changeover
  8 Serial Digital Channel Selection

Describes the airborne components of the successor to the ARINC Communications Addressing and Reporting Systems, ACARS. Provides general and specific design guidance for the development and installation of the Enhanced ACARS airborne equipment.