ETSI EN 301 842-2:2014 VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.7.0)
The present document applies to the following radio equipment types: Very High Frequency (VHF) Digital Link (VDL) Mode 4 ground-based radio transmitters and receivers for air-ground communications operating in the VHF band@ using Gaussian-filtered Frequency Shift Keying (GFSK) Modulation with 25 kHz channel spacing and capable of tuning to any of the 25 kHz channels from 112@000 MHz to 136@975 MHz as defined in ICAO VHF Digital Link (VDL) Standards and Recommended Practices (SARPs) [1]. The present document provides part 2 of the technical specifications. The present document is designed to ensure that equipment certified to it will be compatible with the relevant ICAO VDL SARPs [1] and ICAO VDL4 Technical Manual [i.1]. Manufacturers should note that in future the tuning range for the ground transceivers may also cover any 25 kHz channel from 108@000 MHz to 111@975 MHz. The scope of the present document is limited to ground stations. The equivalent specification for airborne stations is ETSI EN 302 842 [i.4]. The VDL Mode 4 system provides data communication exchanges between aircraft and ground based systems supporting surveillance and communication applications. The supported modes of communication include: broadcast and point-to-point communication; broadcast services including Automatic Dependent Surveillance-Broadcast (ADS-B)@ Traffic Information Service-Broadcast (TIS-B) and Flight Information Service-Broadcast (FIS-B) capabilities; air-to-air@ air-to-ground@ ground-to-air and ground mobile services; operation without ground infrastructure. VDL Mode 4 is designed to be an Air/Ground subsystem of the Aeronautical Telecommunication Network (ATN) [i.2] using the AM(R)S band and it is organized according to the Open Systems Interconnection (OSI) model (defined by ISO). It provides reliable sub network services to the ATN system. Other networks can also be supported but these have not been focussed on in the present document. The present document specifies functional specifications of VHF communication ground station equipment intended to be used for air-ground and air-air data communications. The present document is derived from the standards and specifications in: VDL Mode 4 standards produced under the auspices of the International Civil Aviation Organization (ICAO) [i.1]. Other relevant standards as defined in clause 2. It is envisaged that manufacturers may provide equipment supporting: broadcast services only; point-to-point services only; both broadcast and point-to-point services. ETSI EN 301 842-1 [3] deals with tests of the physical layer. The present document defines the core link layer requirements for the VDL Mode 4 ground station necessary to support all types of equipment. This includes a simple position broadcast functionality. The present document deals with tests of the link layer sufficient to support core link layer functionality@ and it also includes requirements and tests sufficient to recognize and respond to transmissions associated with point-to-point communication. The present document does not address requirements for the full ADS-B message set@ or for other broadcast applications that can be supported by the VDL Mode 4 equipment. These are covered by ETSI EN 301 842-3 [4]. Detailed requirements for point-to-point communication are beyond the scope of the present document@ but can be found in ETSI EN 301 842-4 [5]. ETSI EN 301 842-4 [5] also includes the interface to the Aeronautical Telecommunication Network (ATN) as defined in ATN SARPs [i.2]. As the measured values of equipment performance may be a function of the method of measurement@ standard test conditions and methods of test are recommended in the present document. The present document is organized as follows: clause 2 provides references to relevant documents; clause 3 provides general definitions and abbreviations used; clause 4 describes the VDL Mode 4 ground station link layer; clause 5 provides performance specifications for the VDL Mode 4 ground station and ground station coordination; clause 6 provides general design requirements; clause 7 provides protocol tests for core link layer functions; annex A provides a detailed cross-reference to the relevant requirements contained in reference [i.1]; annex B provides a description of the ISO/IEC 9646 [6] Test Methodology; annex C provides a Bibliography Note that the system can support a very wide range of functions. It is not practical to provide specific tests for all aspects of its functionality. The approach used is to provide detailed tests for the core link layer functionality and to provide tests of those remaining requirements which@ if wrongly implemented@ could cause a deterioration in the service offered by other VDL Mode 4 stations. Therefore: a detailed set of protocol tests are provided for the core link layer functionality necessary to support broadcast functions; a detailed test of position encoding and decoding is provided because of the importance of position in the management of the VDL Mode 4 link specifically and the need to support ADS-B applications in general.
ETSI EN 301 842-2:2014 history
2015ETSI EN 301 842-2:2015 VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.7.1)
2014ETSI EN 301 842-2:2014 VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.7.0)
2011ETSI EN 301 842-2:2011 VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.6.1)
2010ETSI EN 301 842-2:2010 VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.6.1)
2006ETSI EN 301 842-2:2006 Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.
2005ETSI EN 301 842-2:2005 Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: Data link layer (V1.4.1)
2004ETSI EN 301 842-2:2004 Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment; Part 2: General description and data link layer (V1.
2003ETSI EN 301 842-2:2003 Electromagnetic Compatibility and Radio Spectrum Matters (ERM); VHF Air-Ground Data Link (VDL) Mode 4 Radio Equipment; Technical Characteristics and Methods of Measurement for Ground-Based Equipment; Part 2: Data Link Layer (V1.2.1)
2002ETSI EN 301 842-2:2002 Electromagnetic Compatibility and Radio Spectrum Matters (ERM); VHF Air-Ground Data Link (VDL) Mode 4 Radio Equipment; Technical Characteristics and Methods of Measurement for Ground-Based Equipment; Part 2: Data Link Layer (V1.2.1)
2001ETSI EN 301 842-2:2001 Electromagnetic Compatibility and Radio Spectrum Matters (ERM); VHF Air-Ground Data Link (VDL) Mode 4 Radio Equipment; Technical Characteristics and Methods of Measurement for Ground-Based Equipment; Part 2: Data Link Layer (V1.1.1)