User's Guide
Table Of Contents
- Introduction
- System Description
- System Operation
- Testing and Fault Isolation
- Maintenance and Repair
- Appendix A: Return Material Authorization
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© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
The satellite communication avionics (A781-500 system), in conjunction with an antenna subsystem, act
as an AES/MES. The combined system provides users with a data and voice communications link to the
satellite network and global telecommunications system.
Figure 1-1 illustrates a simplified satellite communications system.
2. Equipment Overview
The A781-500 system, in combination with the antenna sub-system, provides Aeronautical Mobile
Satellite Services (AMSS) by facilitating airborne satellite communications over the Inmarsat network,
including the following services:
• Classic Aero-H+—Provides ACARS packet data services at 600, 1,200, or 10,500 bps over the PRT
channel combination and half-rate circuit switched voice service over the C channel. FAX data ser-
vices are not available over Classic Aero-H+.
• SwiftBroadband (SBB)—Provides AMBE+2 voice (circuit-switched) and broadband packet switched
services. The equipment can achieve aggregate rates of 432 kbps, but data rates may vary with net-
work load and signal quality.
Figure 1-1. Simplified Aeronautical Satellite Communications System
DRAFT as of
4 Mar 2016