User's Manual

Table Of Contents
ABBREVIATED COMPONENT MAINTENANCE MANUAL
1458-A-1101 / 1458-A-1300
2. Operation (TASK 23-15-30-870-802-A01)
A. General (Subtask 23-15-30-870-004-A01)
(1) The SDU is an integral component in an AES. Together with the SCM, DLNA, and HGA
subsystem, it achieves all of the requirements for providing AMSS by facilitating airborne
satellite communication services over the Inmarsat network. These services comprise Classic
Aero-H+, Swift64, and SBB.
(2) The SCM is a dedicated peripheral of the SDU and stores aircraft specific installation
configuration critical to the operation of the AES.
B. Satellite Network Overview (Subtask 23-15-30-870-005-A01)
(1) This section provides a brief overview of the Inmarsat I-3/I-4 satellite communication system.
Satellite communication systems include global satellite networks, GES/LES, and AES/MES.
(2) GES and AES are the terms associated with Aero-H+ services.
(3) Satellite communication systems give users with long-range voice and data communication by
accessing global satellite and ground communications networks.
(4) Inmarsat is an international organization that operates and maintains the satellites and satellite
networks. Inmarsat operates multiple geostationary satellites. Each satellite is
•AORE
•AORW
•IOR
•POR.
(5) All I-3 satellites give worldwide telecommunication services for aviation, shipping, and
land-mobile terminal users. The satellites connect to ground telecommunication systems
through a network of GESs.
(6) In addition to the services offered by I-3 satellites, the I-4 satellites also give worldwide
broadband service, SBB. Each I-4 satellite has 19 wide spot beams, 228 narrow spot beams,
and is capable of accommodating many different, simultaneous SBB sessions. The SBB
service and I-4 satellites support broadband applications such as videoconferencing and
video-streaming.
(7) At the time of publishing, three I-4 satellites are operational:
•Americas
•EMEA
Asia-Pacific.
(8) The satellite communication avionics (ARINC 781 systems), typically 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.
(9) A simplified satellite communications system is shown in Figure 9 (GRAPHIC
23-15-30-99B-809-A01).
EFFECTIVITY
ALL
23-15-30
Page 39 of 70
5 Oct 2012
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