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Page 1-6
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(5)
The HPA is designed to support multi-carrier Inmarsat Class 6F and 7F requirements for
Aeronautical Mobile Satellite Services (AMSS).
3.
SDU System
(TASK 23-15-49)
A.
Satellite Data Unit
(1)
The Aspire 400 Satellite Data Unit (SDU) is the central communications processing and
control unit, largely determining the functionality of the complete Aircraft Earth Station.
The signal-in-space parameters are determined by the SDU in relation to modulation/
demodulation, error correction, coding, interleaving and data rates associate with the
communication channel(s).
(2)
The Dual Aeronautical BGAN Card (DABC) provides the Inmarsat modem interface from
the vaious voice and data user interfaces to the SATCOM RF interface. Modulation and
protocol management are applied as part of this process as well as interface routing. The
Dual Aeronautical BGAN Card provides two segregated channels.
B.
SDU Functions and Services
(1)
The Aspire 400 SDU provides SATVOICE and DATA using the Inmarsat extended L-
Band Swift Broadband service in support of the following categories of communications:
(a)
Air Traffic Service (ATS),
(b)
Aircraft Operational Control (AOC),
(c)
Aeronautical Administrative Communication (AAC), and
(d)
Aeronautical Passenger Communications (APC).
(2)
The Aspire 400 provides up to two Swift Broadband channels:
(a)
A Swift Broadband safety channel for the following services:
1
ACARS data (Aircraft Communications Addressing and Reporting
System),
2
Voice (two channels - one Circuit Switched Voice (CS) and one Packet
Switched Service (PS) using VoIP),
3
Position Reporting.
4
AIS Electronic Flight Bag.
(b)
A Swift Broadband non-safety channel is used for the Circuit Switched Voice and
Packet Switched Data.
C.
Application Mode: Single Channel Aspire 400 ACD/AIS Configuration
(1)
The following figures are provided to show the interconnection between the Aspire 400
and other aircraft systems and services.
DRAFT
3rd rvw Draft as of:
29 January, 2020
Summary of Contents for 90402651-000
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