Users Manual

ALL

EFFECTIVITY

Page 2-1

22 Apr 2019

23-15-49

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL

ASPIRE-400

SECTION 2 – SYSTEM OPERATION

1. General

A. System Overview

(1) The Aspire 400 SDU/SCM/HPA (Satellite Data Unit/ SDU Configuration Module/ High

Power Amplifier) subsystem is part of the Aircraft Earth Station (AES) that facilitates

airborne satellite communications using Swift Broadband (SBB) services over the

Inmarsat L-Band satellite communications network.

2. Modes of Operations

A. Modes of Operation Transition Path

(1) The modes of operation begins with “Power On” where the OS boots

(2) The SDU begins its configuration and testing based on the ORT loading operational

software where the SDU then boots up and begins validation

(a) If the validation fails then the system begins a safe power shut down:

1 Data load command signal will begin a load progress reset

2 SDU configuration or ORT operation software must be fixed.

(3) The SDU will then have the option for several tests and checks:

(a) Maintenance Test Command which places the system in Aircraft Test Mode,

once finished, the system returns to SDU Configuration is supported and the

application is loaded for the Inmarsat configuration services. The system can

now enter Aircraft Test Mode.

(4) At all steps in the process, except for the Aircraft Test Mode, data is sent to be checked

against the ORT and is either sent back to the SDU configuration and testing or the

process is interrupted and the data load progress is reset.

(5) Figure 2-1 provides an understanding of the modes of operation and the possible

transitions between the different modes.

DRAFT

3rd rvw Draft as of:

29 January, 2020