Fleet Satellite Communications System and Subsystems

Information Systems Technician Training Series, Module 4 - Communications Hardware
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Figure 2-11.—AN/ARC-143 UHF Transceiver. can be used to transmit or receive voice or data in the 255.0- to 399.99-MHz frequency range. The systems discussed are only a few of the SATCOM equipments used by the Navy. Some of the references listed in Appendix III of this module are excellent sources for more information on satellite equipment and systems. FLEET SATELLITE COMMUNICATIONS SYSTEM AND SUBSYSTEMS The Fleet Satellite Communications (FLTSATCOM) system and subsystems provide communications links, via satellite, between shore commands and mobile units. The system includes RF terminals, subscriber subsystems, training, documentation, and logistic support. Within each satellite, the RF channels available for use have been distributed between the Navy and the Air Force. Equipments in support of the FLTSATCOM system are on ships, submarines, aircraft, and at shore stations. These equipment installations vary in size and complexity. Furthermore, with the exception of voice communications, the system applies the technology of processor- (computer-) controlled RF links and uses the assistance of processors in message traffic preparation and handling. Although any part of the FLTSATCOM system can be operated as a separate module, system integration provides connections for message traffic and voice communications to DOD communications networks. A backup capability that can be used in the event of an outage or equipment failure is provided for both shore and afloat commands. All subsystems have some form of backup mode, either from backup equipment and/or systems, facilities, or RF channels. This capability is built in as part of the system design and may limit the ability of selected FLTSATCOM systems to process information. FLEET SATELLITE BROADCAST (FSB) SUBSYSTEM The Fleet Satellite Broadcast (FSB) subsystem is an expansion of fleet broadcast transmissions that historically have been the central communications medium for operating naval units. The FSB transmits messages, weather information, and intelligence data to ships. The shore terminal transmits this data on a direct SHF signal to a satellite, where the signal is translated to UHF and downlinked. Figure 2-12 shows a standard FSB subsystem configuration. Figure 2-12.—Fleet Satellite Broadcast subsystem. 2-11

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