Home' RTCA Documents for Review : DO-262D Contents Appendix E
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The Inmarsat ground infrastructure.
The Communication Network Provider’s (CNP’s) ground infrastructure.
The SBB data and voice communication services described in this appendix are
delivered between the AES avionics interface and the CNPs’ ATSP interfaces as
shown in FIGURE E1-1. Although not shown in the figure, the CNPs also deliver non-
priority voice and data services to airlines, for operational communications with their
SBB is delivered over the Inmarsat-4 satellites (3 satellites launched between 2005
and 2008) and the Alphasat satellite (launched in 2013) using user links in the L band
and feeder links in C band. The satellites are geostationary with inclination typically
less than 3 degrees, and provide worldwide coverage with the exception of Polar
Regions. Key aspects of the I4 satellites are a single 9m aperture antenna and a
transparent, bent-pipe, digital signal processor (DSP) that performs the channelization
and beam forming functions. Each satellite provides a global beam, 19 regional
beams and typically 192 narrow spot beams. Alphasat has a similar architecture, but
has a larger antenna aperture. It is expected that SBB will operate over the I6
satellites which will be Inmarsat’s next generation of L-band capable satellites with
delivery of the first satellite expected by 2020.
Services offered by SBB are described in section 1.3.2 .
Three classes of SBB AES are defined:
AES4 which uses an Enhanced Low Gain Antenna (ELGA).
AES7 which uses an Intermediate Gain Antenna (IGA).
AES6 which uses a High Gain Antenna (HGA).
Inmarsat owns and operates the satellite ground infrastructure and delivers traffic at
Meet Me Points (MMPs) to CNPs such as ARINC and SITA. The CNPs provide key
elements of the end-to-end ACARS and Voice service and deliver traffic to ATSPs and
The Aeronautical service offered by the satellites is known as SwiftBroadband (SBB).
SBB shares the same satellite and ground infrastructure that is used to deliver similar
services to the land and maritime segments. Collectively the service is known as
BGAN (Broadband Global Area Network) and this term is often used to describe the
totality of the system across all market segments. The maritime service is known as
BGAN is based on UMTS 3G technology and delivers standard 3G voice and IP data
services. In addition, gateway functions are included that utilize the 3G bearer
services to provide the ACARS and ATN/OSI data services and the Voice Over
Internet Protocol (VoIP) component of the voice service. The ATN/IPS data service
will be added in the future.
An AES may be designed to offer automatic reversion to the Classic Aero service as
described in Section 1.3.9. In the Classic Aero mode the services are limited to
oceanic ACARS and voice.
The AES provides voice and data communications interfaces to the avionics on the
aircraft (see FIGURE E1-1). The AES connects to the Satellite Service Provider
(Inmarsat) ground network through the satellite constellation. A Communication
Network Provider delivers these services to the Air Traffic Service Provider (ATSP).
The AES is responsible for maintaining its allocated portion of the end-to-end
performance parameters between its boundaries at points F and G for air-to-ground
communications and points B and C for ground-to-air communications.
Services Provided by SwiftBroadband
FIGURE E1-3 gives an overview of the priority services and non-priority services
provided by SwiftBroadband. The priority services are described below in Section
126.96.36.199 and its subsections. Non-priority services are described in Section 188.8.131.52 .
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