Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2209

5. VDL AIRBORNE OPERATING CONCEPT 5.1 Avionics 5.1.1 VDL avionics. In order to operate in a VDL network, aircraft need to be equipped with an avionics system providing the VDL subnetwork user (ISO 8208 DTE) function. The system providing this function will also provide the subnetwork user functions for the other air-ground ATN-compatible subnetworks and the aircraft ATN intermediate system function and, hence, its development is necessary in order to provide ATN communications to multiple end-systems or over multiple air-ground subnetworks. 5.2 VDL avionics certification 5.2.1 The VHF digital radio may also provide for double-side band amplitude modulation (DSB-AM) voice capability for emergency back-up to VHF radios used for voice communications. It would be necessary in this case to demonstrate that the VDL functionality of the VDR does not interfere with the DSB-AM voice functionality. 5.2.2 The VDL function in the VHF digital radio provides an air-ground data link service to the VDL subnetwork user entity of the aircraft ATN intermediate system. If the provision of a VHF subnetwork service to an ATN intermediate system were considered an essential service for a particular installation, the VDL functionality of the VDR would need to be certified as an essential function. The use of VDL for ATS communications is not, however, intended to require two aircraft radios to operate simultaneously in VDL mode. 5.3 Registration of aircraft with VDL network operators 5.3.1 For normal communications service, it is to be expected that aircraft operators will be required to register their aircraft with the network operators. In emergency or back-up situations, it must be possible for any VDL-equipped aircraft to establish connectivity over any VDL ground station network. 5.3.2 Registration of aircraft VDL stations with VDL network operators is desirable for network management since, for example, a network operator may identify a temporary fault in the VDL communications from an aircraft and would wish to contact the operator of the aircraft in order to have the fault resolved. Registration of aircraft is also useful in planning the required ground station network capacity. Registration with a VDL ground station network operator does not necessarily imply that the aircraft operator will be charged for use of the VDL ground station network. Annex 10 — Aeronautical Communications Volume III 22/11/07 ATT I-6 Figure ATT I-1. _____________________ Ground station domain B Ground station domain B Ground station domain A Ground station domain A Ground station domain A Ground station domain A X.25 network X.25 network X.25 network X.25 virtual circuit between IS X.25 virtual circuit between IS ATN intermediate system ATSC routing domain A ATN intermediate system ATSC routing domain A ATN intermediate system ATSC routing domain B ATN intermediate system ATSC routing domain B Scenario where boundary ground stations provide access to a single IS Scenario where boundary ground stations provide access to IS in two routing domains VDL subnetwork connection to IS domain A VDL subnetwork connection to IS domain A Maintained VDL subnetwork connection to IS domain A New VDL subnetwork connection to IS domain B New VDL subnetwork connection to IS domain B for domain changeover Maintained VDL subnetwork connection to IS domain A Maintained VDL subnetwork connection to IS domain B ANNEX 10 — VOLUME III ATT II-1 22/11/07 ATTACHMENT TO PART II. GUIDANCE MATERIAL FOR COMMUNICATION SYSTEMS

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