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ARINC 720:1979

ARINC 720:1979 Digital Frequency/function Selection For Airborne Electronic Equipment Describes the air transport industry's recommended standards for digital frequency selection (DFS) system. This standard addresses two opposite ends of the DFS integration possibilities: a totally cen

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Table of Contents

1.0INTRODUCTION
1.1PurposeofThisDocument
1.2RelationshiptoARINCSpecification429
1.3BriefDescriptionoftheDFSSystem
1.3.1RadioConfiguration
1.3.2CentralizedDFSSystem
1.3.3FederatedDFSSystem
2.0SYSTEMCONCEPTS
2.1CentralizedDFSSystem
2.1.2AircrewInterface
2.1.3ControlledDeviceDigitalDataInputPorts
2.1.4ControlledDeviceControlSourceSelection
2.1.5RemoteFrequencySourceSelection
2.1.6DFSSubsystemCrosstalk
2.1.7FailureEffectsProtection
2.1.8ControlofAdditionalLikeRadios
2.1.9ILSTuneInhibit
2.2FederatedDFSSystem
2.2.1SystemArchitecture
2.2.2AircrewInterface
2.2.3RemoteFrequencySourceSelection
2.2.4ILSTuneInhibit
3.0SYSTEMSTANDARDS
3.1PrimaryPowerInput
3.1.1CentralizedDFSSystem
3.1.2FederatedDFSSystem
3.2DigitalDataStandards
3.3SelectionDiscretes
3.4NonvolatileMemory
4.0SYSTEMDESIGN
4.1DFSSystemPackaging
4.2DesiredSystemCapabilities
4.3SystemLoading
5.0APPLICATIONSNOTES
5.1Radio/ElectronicSystemControls
5.1.1ADF
5.1.2DME
5.1.3HFCommunications
5.1.4ILS
5.1.5VOR
5.1.6VHFCommunications
5.1.7Transponder
5.2DFSSystemCrewStation
5.2.1DataEntry
5.2.1.1NumericDataEntry
5.2.1.2DataIdentification(InputDirection)
5.2.1.3SwitchFunctions
5.2.1.4DataEntryOperation
5.2.2StatusDisplay
5.2.3ExternalProgramInputs
5.3TypicalDFSInstallations
ATTACHMENTS
1StandardsforDiscreteControlSignals
2SystemsConcepts
3TypicalInstallations
APPENDIX
1Bibliography

Abstract

Describes the air transport industry's recommended standards for digital frequency selection (DFS) system. This standard addresses two opposite ends of the DFS integration possibilities: a totally centralized and a federated system. This is necessary to assure that the radio interface specifications are adequate to cover a range of DFS integration.

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