777 AIRCRAFT MAINTENANCE MANUAL
VHF SYSTEM -TRANSMIT MODE
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VHF SYSTEM -SYSTEM TESTS
General
Use a maintenance access terminal (MAT) to do the system tests. These are the system tests for the VHF system:
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Center VHF communication system test
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Left VHF communication system test
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Right VHF communication system test.
VHF Communication System Test
Select the system (center, left or right) for test.
This test makes sure that the VHF communication system operates correctly. The approximate time to run the test is less than one minute. There are no airplane effects. There are no limitations or special requirements. To run the test select CONTINUE.
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777 AIRCRAFT MAINTENANCE MANUAL
VHF SYSTEM -SYSTEM TESTS
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777 AIRCRAFT MAINTENANCE MANUAL
VHF SYSTEM -INTERFACES
Interfaces
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777 AIRCRAFT MAINTENANCE MANUAL
VHF SYSTEM -INTERFACES
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777 AIRCRAFT MAINTENANCE MANUAL
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SATELLITE COMMUNICATIONS SYSTEM -INTRODUCTION
Purpose
The satellite communications (SATCOM) system uses ground stations and satellites to transmit and receive data and voice messages. SATCOM supplies higher quality data and voice message signals for passengers and crew, over longer distances than VHF/HF communication systems.
Abbreviations and Acronyms
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ACARS -aircraft communications addressing and reporting system
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ACP -audio control panel
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ADL -airborne data loading
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AIMS -airplane information management system
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AMU -audio management unit
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attn -attenuator
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BSU -beam steering unit
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BITE -built-in test equipment
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CCD -cursor control device
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CDU -control display unit
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CMCF -central maintenance computing function
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CTU -cabin telecommunication unit
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DCGF -data conversion gateway function
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DCMF -data communication management function
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DSP -display select panel
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FAX -facsimile machine
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GHz -gigahertz
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HGA -high gain antenna
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HPA -high power amplifier
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HPR -high power relay
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I/O -input/output
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IF -intermediate frequency
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LNA/DIP -low noise amplifier/diplexer
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LGA -low gain antenna
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LSK -line select key
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MAT -maintenance access terminal
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MHz -megahertz
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OMF -onboard maintenance function
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OMS -onboard maintenance system
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RFC -radio frequency combiner
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RFS -radio frequency splitter
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RFU -radio frequency unit
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SATCOM -satellite communications
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SDU -satellite data unit
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stbd -starboard
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SATELLITE COMMUNICATIONS SYSTEM -INTRODUCTION
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SATCOM SYSTEM -GENERAL DESCRIPTION
General
The satellite communications (SATCOM) system uses a satellite network, ground stations and airplane satellite communication equipment to transmit and receive data and voice messages.
Satellites
Satellites act as relay stations between the ground stations and the airplane.
Ground Station
The ground station connects the SATCOM system to the ground-based aircraft communications addressing and reporting system (ACARS) and public telephone networks.
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