ARINC 634 : 1996

1.0 INTRODUCTION AND EXECUTIVE SUMMARY
1.1 Purpose of This Document
1.2 Improved System Availability
1.3 Efficient Spectrum Usage and Greater System
               Capacity
1.4 Automatic Frequency Selection
1.5 Data Integrity Comparable to Other Data Link
               Systems
1.6 HF Data Link Is A More Effective Back-up To
               SATCOM
2.0 HF DATA LINK SYSTEM DESCRIPTION
2.1 Introduction
2.2 HF Data Link Avionics System
2.3 HF Data Link Ground System
2.4 Antennas for HF Data Link Ground Stations
3.0 OPERATIONAL CONCEPT (SCENARIOS)
3.1 HF Data Link Operational Concepts
3.2 AOC Operational Concept
3.3 HF Data Link Service Provider Operational Concept
3.4 Air Traffic Services (ATS) Operational Concept
4.0 GROUND STATION NETWORKING/INTEROPERATION
4.1 Overall System Concept
4.2 Ground Station Networking
4.3 Ground Station Interoperation
5.0 TRANSITIONS/CAPACITY GROWTH
5.1 Transition/Capacity Growth
5.2 Coverage Transition
5.3 Implementation Scenario
6.0 SPECTRUM AND NETWORK MANAGEMENT
6.1 Introduction
6.2 Definition of Geographic Regions
6.3 Number of HF Ground Stations Per Geographic Region
6.4 Minimum Number of Active Frequencies To Serve the
               Peak Load Per Region
6.5 Number of Active Frequencies Per Station and
               Geographic Region
6.6 Number of Active Frequencies Needed on a Global
               Basis
6.7 Dynamic Frequency Management
ATTACHMENTS
1-1 Airborne Subsystem Block Diagram
1-2 Ground Communications Subsystem Architecture
1-3 End-To-End System Model
2-1 HFDU System Block Diagram
2-2 HFDR System Block Diagram
3 Antennas
APPENDICES
A Frequency Estimates to Support HFDL Service
B HF Data Link Trials
C1 Simulation Studies (BONeS)
C2 Simulation Studies (OPNET)
D Propagation Studies
E List of Definitions
F Acronym List

Gives the reader with material to enhance the understanding of High Frequency Data Link.