SIST EN 301 842-2 V1.5.1:2007

• Abstract:

  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 118,000 MHz to 136,975 MHz as defined in ICAO VHF Digital Link (VDL) Standards and Recommended Practices (SARPs) [14]. 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 VHF Digital Link (VDL) Standards and Recommended Practices (SARPs) [14] and VDL Mode 4 Technical Manual (TM) [1] and with the SES 552/2004 interoperability Regulation [16]. 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 117,975 MHz. The scope of the present document is limited to ground stations. The equivalent specification for airborne stations is EN 302 842 [13]. 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) [8] 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) [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.; EN 301 842-1 [4] 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 EN 301 842-3 [9]. Detailed requirements for point-to-point communication are beyond the scope of the present document, but can be found in EN 301 842-4 [10]. EN 301 842-4 [10] also includes the interface to the Aeronautical Telecommunication Network (ATN) as defined in ATN SARPs [8].; 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.

• Status: Published
• Publication Date: 31-Jan-2007
• ICS: 33.060.99 - Other equipment for radiocommunications
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 35.100.20 - Data link layer
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Feb-2007
• Due Date: 01-Feb-2007
• Completion Date: 01-Feb-2007
• Mandate: M/239
• Ref Project: ETSI EN 301 842-2 V1.5.1 (2006-11) - 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

SIST EN 301 842-2 V1.5.1:2007 is the Slovenian identical adoption of ETSI EN 301 842-2 V1.5.1 for VHF air-ground Digital Link (VDL) Mode 4 ground equipment. It specifies the general description, data link layer behavior, minimum performance specification and protocol test procedures for VHF ground-based radio transmitters, transceivers and receivers used for aviation air-ground communications. The standard is written for manufacturers, test laboratories, quality teams and certifying authorities that need to check compatibility with ICAO VDL Mode 4 requirements and related interoperability rules.

What does SIST EN 301 842-2 V1.5.1:2007 specify?

SIST EN 301 842-2 V1.5.1:2007 applies to ground-based VDL Mode 4 radio equipment operating in the VHF band with GFSK modulation, 25 kHz channel spacing and tuning across the 118.000 MHz to 136.975 MHz range. The scope is limited to ground stations, and the airborne equivalent is EN 302 842.

The document covers broadcast and point-to-point communication, including ADS-B, TIS-B and FIS-B capabilities, as well as operation without ground infrastructure. It is organized as a general description, minimum performance specification, design requirements and protocol test procedures, followed by informative annexes.

Annex	What it covers
Annex A	Cross reference matrix
Annex B	Description of ISO/IEC 9646 test methodology
Annex C	Bibliography

What are the key requirements of SIST EN 301 842-2 V1.5.1:2007?

Clause 4 sets out the system model for VDL Mode 4 ground stations. It links the equipment to the OSI reference model, describes VDL Mode 4 services and operational scenarios, and introduces concepts such as ground quarantine, net entry and autotune capability. In practice, this tells an implementer what kind of link behavior the station must support before any testing starts.

Link-layer behavior and timing

Clause 5.1 defines the MAC sublayer services and parameters, including M1, the number of slots per superframe, plus time synchronization, slot idle/busy/occupied detection and signal level indication. A ground station therefore has to keep correct timing and know whether a slot can be used before it transmits.

Clause 5.2 defines the VSS sublayer burst format and service behavior. It covers version number, source address, message ID, information field, reservation fields and the autonomous/directed flag, then specifies access protocols for reserved, random, fixed and broadcast uses. In practice, the station must form and recognize the right burst type for each communication mode.

Access control, reservations and QoS

Clause 5.2.3 defines VSS parameters such as VS1, VS2, VS4 and VS5, and clause 5.2.4 defines quality-of-service parameters such as Q1, Q2a to Q2d, Q3 and Q4. These parameters control quarantine, congestion handling, priority and slot selection, so they determine how the station behaves when the channel is busy.

Clause 5.2.6 to 5.2.21 cover the reserved access protocol, random access protocol, fixed access protocol, null reservation, periodic broadcast, incremental broadcast, combined broadcast, BND broadcast, unicast request, information transfer request, directed request, block reservation, response, general request, general response and retransmission procedures. For users, this means the standard specifies how the equipment asks for, receives and reuses channel time in different traffic cases.

DLS, LME and ground-station integration

Clause 5.3 defines the DLS sublayer, including data transfer, station address encoding, burst formats and ND4, the maximum length of a UDATA burst. Clause 5.4 defines the Link Management Entity (LME) sublayer, including synchronization burst format, CTRL parameter formats, timers, network entry and ADS-B request and information field formats. This is the control logic that keeps stations synchronized and able to join the network.

Clause 5.5 adds ground-station requirements for primary time maintenance, coordination between stations, network timing, transmission control, rebroadcast of superframe block reservations and protection of fixed access by ground quarantine or by appropriate reservation protocols. It also covers autotune reservation limits, transmission timing and channel-usage reporting. In practice, a ground site must coordinate its transmissions so it does not interfere with other stations.

Clause 5.6 gives the definitions and calculations for compact position reporting, including encoding and local and global decoding of position data. Software that creates or interprets position reports has to use these calculations consistently.

What terms does SIST EN 301 842-2 V1.5.1:2007 define?

• VHF air-ground Digital Link (VDL) Mode 4 - the aeronautical digital link system covered by the standard for air-ground and air-air data exchange.
• Gaussian-filtered Frequency Shift Keying (GFSK) - the modulation used by the radio equipment.
• Automatic Dependent Surveillance-Broadcast (ADS-B) - the broadcast surveillance service supported by the system.
• Aeronautical Telecommunication Network (ATN) - the wider aviation data network that VDL Mode 4 is intended to support.
• Open Systems Interconnection (OSI) - the reference model used to organize the link layer structure.
• Link Management Entity (LME) - the sublayer that manages synchronization, control parameters and network entry.
• compact position reporting - the position encoding method defined in clause 5.6 for generating and decoding position reports.

Who uses SIST EN 301 842-2 V1.5.1:2007?

Manufacturers use this standard when designing VDL Mode 4 ground stations and their link-layer software. Test laboratories use it to build protocol test cases and to judge conformance under standard test conditions. Certifying authorities and buyers use it to check whether a ground station is suitable for interoperable aviation communications. Quality managers and system engineers use it to verify timing, access behavior, reservation handling and ADS-B-related functions.

Which standards are used with SIST EN 301 842-2 V1.5.1:2007?

• ICAO VHF Digital Link (VDL) Standards and Recommended Practices (SARPs) - define the channel and system framework the equipment must match.
• VDL Mode 4 Technical Manual (TM) - provides the Mode 4 technical basis used by the standard.
• SES 552/2004 interoperability Regulation - the standard is written to support compliance with this interoperability requirement.
• EN 301 842-1 - covers physical layer tests for the same ground equipment.
• EN 301 842-3 - covers the full ADS-B message set and other broadcast applications.
• EN 301 842-4 - covers point-to-point functions and the ATN interface.
• EN 302 842 - the equivalent airborne specification for airborne stations.
• EN 301 489-22 - gives the EMC-related companion requirements assumed by the document.
• ATN SARPs - define the ATN interface referenced for point-to-point communication.
• ISO/IEC 9646 - supplies the test methodology described in Annex B.

What does the SIST EN 301 842-2 V1.5.1:2007 document contain?

Clause 7 contains the protocol test procedures. It includes the required test rig, test-suite methodology, declarations, constraints, macros and detailed test cases for timing, access, burst content, slot selection and reservation behavior. The clauses also include burst format definitions, parameter tables, procedure descriptions and worked test logic for broadcast, unicast and incremental reservation cases.

Annex B explains the ISO/IEC 9646 test-suite structure used by the procedures. Annex A gives a cross reference matrix, and Annex C lists the bibliography.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HKQLþQHElectromagnetic 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 layer35.100.20Podatkovni povezovalni slojData link layer33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 301 842-2 Version 1.5.1SIST EN 301 842-2 V1.5.1:2007en01-februar-2007SIST EN 301 842-2 V1.5.1:2007SLOVENSKI
STANDARD
ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 2
Reference REN/ERM-TG25-029-2 Keywords aeronautical, digital, radio, testing, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2006. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 301 842-2 V1.5.1:2007

ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 3
Contents Intellectual Property Rights.8 Foreword.8 Introduction.9 1 Scope.10 2 References.12 3 Definitions and abbreviations.13 3.1 Definitions.13 3.1.1 Basic reference model definitions.13 3.1.2 Service conventions definitions.13 3.1.3 General definitions.13 3.1.4 Definition of bit order.17 3.2 Abbreviations.17 4 General description of VDL Mode 4 ground station link layer.18 4.1 General.18 4.1.1 Overview of VDL Mode 4.18 4.1.2 Relationship to OSI reference model.19 4.1.3 VDL Mode 4 services.21 4.1.4 ADS-B Function.21 4.1.5 Operational scenarios.22 4.1.6 VDL Mode 4 fundamentals.22 4.1.7 Possible configuration of ground equipment.23 4.1.8 Overall structure of specifications for VDL Mode 4.24 4.1.9 Equipment performance verification.25 4.2 Ground quarantine.26 4.3 System timing.26 4.4 Net entry.26 4.5 Autotune capability.26 4.6 Autonomous and fixed access.27 5 Minimum performance specification under standard test conditions.27 5.1 MAC sublayer.27 5.1.1 Services.27 5.1.2 MAC sublayer services.27 5.1.3 MAC sublayer parameters.27 5.1.3.1 General.27 5.1.3.2 Parameter M1 (number of slots per superframe).28 5.1.4 Time synchronization.28 5.1.4.1 Primary.28 5.1.4.2 Secondary.28 5.1.4.3 Alignment to UTC second.28 5.1.4.4 Data quality level.28 5.1.5 Slot idle/busy notification.29 5.1.5.1 Slot idle detection.29 5.1.5.2 Slot busy detection.29 5.1.5.3 Slot occupied detection.29 5.1.5.4 Signal level indication.29 5.1.6 Transmission processing.29 5.1.7 Received transmission processing.30 5.2 VSS sublayer.30 5.2.1 Services.30 5.2.1.1 Error detection.30 5.2.1.2 Channel congestion.30 5.2.2 Burst format.31 5.2.2.1 VSS burst structure.31 SIST EN 301 842-2 V1.5.1:2007

ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 4
5.2.2.2 Version number.32 5.2.2.3 Source address.32 5.2.2.4 Message ID.32 5.2.2.5 Information field.33 5.2.2.6 Reservation fields.33 5.2.2.7 Autonomous/directed flag.33 5.2.3 VSS sublayer parameters.34 5.2.3.1 General.34 5.2.3.2 Parameter VS1 (number of ground quarantined slots).34 5.2.3.3 Parameter VS2 (minimum CCI performance).35 5.2.3.4 Parameter VS4 (quarantine slot re-use range).35 5.2.3.5 Parameter VS5 (maximum burst length).35 5.2.4 VSS quality of service parameters.35 5.2.4.1 General.35 5.2.4.2 Parameter Q1 (priority).36 5.2.4.3 Parameters Q2a to Q2d (slot selection range constraint for level n).37 5.2.4.4 Parameter Q3 (replace queued data).37 5.2.4.5 Parameter Q4 (number of available slots).38 5.2.5 Received transmission processing.38 5.2.6 Reserved access protocol specification.39 5.2.6.1 Reservation table.39 5.2.6.2 Selecting slots for transmission or reservation.40 5.2.6.3 Reserved transmissions.41 5.2.6.4 Reservation conflicts.42 5.2.7 Random access protocol specification.43 5.2.7.1 General.43 5.2.7.2 Random access parameters.43 5.2.7.3 Random access procedures.44 5.2.8 Fixed access protocol specification.44 5.2.8.1 General.44 5.2.8.2 Recommendation.45 5.2.9 Null reservation protocol specification.45 5.2.9.1 Null reservation burst format.45 5.2.10 Periodic broadcast protocol specification.45 5.2.10.1 Periodic broadcast reservation burst format.45 5.2.10.2 Periodic broadcast timers.46 5.2.10.3 Periodic broadcast parameters.46 5.2.10.4 Periodic broadcast reception procedures.48 5.2.10.5 Periodic broadcast transmission procedures.49 5.2.11 Incremental broadcast protocol specification.51 5.2.11.1 Incremental broadcast reservation burst format.51 5.2.11.2 Incremental broadcast parameters.52 5.2.11.3 Incremental broadcast reception procedures.53 5.2.11.4 Incremental broadcast transmission procedures.53 5.2.12 Combined periodic broadcast and incremental broadcast protocol specification.53 5.2.12.1 Combined periodic broadcast and incremental broadcast reservation burst.53 5.2.13 Big Negative Dither (BND) broadcast protocol specifications.54 5.2.13.1 BND reservation burst format.54 5.2.13.2 BND broadcast parameters.54 5.2.13.3 BND broadcast reception procedures.54 5.2.14 Unicast request protocol specification.55 5.2.14.1 Unicast request reservation burst format.55 5.2.14.1a Unicast request parameters.56 5.2.14.2 Unicast request reception procedures.56 5.2.14.3 Unicast request transmission procedures.57 5.2.15 Information transfer request protocol specification.57 5.2.15.1 Information transfer request reservation burst format.57 5.2.15.2 Information transfer request reception procedures.58 5.2.16 Directed request protocol specification.59 5.2.16.1 Directed request reservation burst format.59 5.2.16.2 Directed request parameters.62 5.2.16.3 Directed request reception procedures.63 SIST EN 301 842-2 V1.5.1:2007

ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 5
5.2.16.4 Directed request transmission procedures.64 5.2.17 Block reservation protocols specification.65 5.2.17.1 Superframe block reservation burst format.65 5.2.17.2 Second frame block reservation burst format.66 5.2.17.3 Superframe block reservation parameters.67 5.2.17.4 Superframe block reservation reception procedures.67 5.2.17.5 Second frame block reservation parameters.68 5.2.17.6 Second frame block reservation reception procedures.68 5.2.17.7 Superframe block reservation transmission procedures.69 5.2.17.8 Second frame block reservation transmission procedures.69 5.2.18 Response protocol specification.70 5.2.18.1 Response burst format.70 5.2.19 General request protocol specification.70 5.2.19.1 General request burst format.70 5.2.19.2 General request procedures.71 5.2.20 General response protocol specification.71 5.2.20.1 General response burst format.71 5.2.20.2 General response procedures.73 5.2.21 Retransmission procedures.73 5.3 DLS sublayer.74 5.3.1 Services.74 5.3.1.1 General.74 5.3.1.2 Data transfer.74 5.3.1.3 Station address encoding.74 5.3.1.4 DLS burst formats.75 5.3.2 DLS system parameters.76 5.3.2.1 Parameter ND4 (maximum length of a UDATA burst).77 5.3.3 DLS procedures.77 5.3.3.1 Broadcast.77 5.3.3.2 DLS not supported.77 5.3.3.3 User data packet reception.77 5.4 Link Management Entity sublayer.77 5.4.1 Services.77 5.4.2 Synchronization burst format.78 5.4.2.1 General.78 5.4.2.2 Fixed and variable data fields.78 5.4.2.3 Fixed data field format.78 5.4.2.4 Variable data field format.82 5.4.2.5 Synchronization burst request.82 5.4.2.6 Link management burst.82 5.4.3 Control (CTRL) parameter formats.83 5.4.3.1 Encoding.83 5.4.3.2 VDL Mode 4 parameter identification.83 5.4.3.3 Ground-initiated modification parameters.83 5.4.3.4 Ground-initiated information parameters.86 5.4.3a LME timers and parameters.89 5.4.3a.1 General.89 5.4.3a.2 Counter L1 (maximum number of missed reservations) and Timer TL3 (inter-miss timer).90 5.4.4 LME procedures.90 5.4.4.1 Synchronization burst procedures.90 5.4.4.2 Peer Entity Contact Table (PECT).92 5.4.4.3 Network entry protocol specifications.92 5.4.5 Additional material for ADS-B applications.93 5.4.5.1 Information field formats.93 5.4.5.2 ADS-B request format.93 5.5 Additional requirements for ground stations.94 5.5.1 System timing requirements.94 5.5.1.1 Maintenance of Primary time.94 5.5.2 Ground station interface requirements.94 5.5.2.1 Ground station coordination.94 5.5.2.2 Network timing requirements.94 5.5.2.3 Application interface requirements.95 SIST EN 301 842-2 V1.5.1:2007

ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 6
5.5.2.4 Transmission control requirements.95 5.5.2.5 Superframe block reservation rebroadcast procedures.95 5.5.2.6 Fixed transmission parameters.96 5.5.2.7 Protection of fixed access protocol transmissions by ground quarantine.96 5.5.2.8 Protection of fixed access protocol transmissions by use of appropriate reservation protocols.96 5.5.2.9 Restriction of autotune reservations.96 5.5.2.10 Transmission time for autotune reservations.96 5.5.2.11 Reporting of channel usage.97 5.6 Definitions for compact position reporting.97 5.6.1 Introduction.97 5.6.2 Parameter symbols, data types, constants and variables.97 5.6.2.1 Parameter symbols.97 5.6.2.2 Data types.97 5.6.2.3 Constants.97 5.6.2.4 Variables.98 5.6.2.5 Functions.99 5.6.2.6 Patch constants.100 5.6.3 Fixed data field position encoding.102 5.6.3.1 General.102 5.6.3.2 Input parameters.102 5.6.3.3 Calculations.102 5.6.4 Fixed data field position local decoding.103 5.6.4.1 General.103 5.6.4.2 Input parameters.103 5.6.4.3 Calculations.103 5.6.5 Fixed data field position global decoding.104 5.6.5.1 General.104 5.6.5.2 Input parameters.104 5.6.5.3 Transition level straddling.105 5.6.5.4 Calculations.105 5.6.6 Position report processing.105 5.6.6.1 Services.105 5.6.6.2 Position report parameters.105 5.6.6.3 Position report processing procedures.106 6 General design requirements.109 6.1 Controls and indicators.109 6.2 Operation of controls.109 6.3 Warm up.109 6.4 Effects of tests.109 6.5 Software management.109 6.6 Recovery from failure.109 6.6.1 Failure of the VDL equipment.109 6.7 Monitoring of proper operation.109 7 Protocol test procedures.110 7.1 General.110 7.1.1 Input voltage.110 7.1.2 Power input frequency.110 7.1.3 Adjustment of equipment.110 7.1.4 Equipment configuration.110 7.1.5 Test equipment.110 7.1.6 Test equipment precautions.110 7.1.7 Ambient conditions.111 7.1.8 Connected loads.111 7.1.9 Warm-up period.111 7.2 Required test rig.111 7.3 Protocol test-suite description methodology.113 7.4 Detailed protocol test procedures.113 7.4.1 Test-suite overview.113 7.4.2 Declarations.118 7.4.3 Constraints.118 SIST EN 301 842-2 V1.5.1:2007

ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 7
7.4.3.1 Abbreviations.118 7.4.3.1.1 Subfield mnemonics.118 7.4.3.1.2 Special characters used in the subfield definitions.119 7.4.3.1.3 Station addresses and positions.119 7.4.3.1.4 Tables of values for use in CPR test cases.121 7.4.3.1.5 Tables of values for use in content checking test cases.131 7.4.3.1.6 VDL4 burst formats.134 7.4.3.2 Test cases.152 7.4.3.2.1 Test case macros.152 7.4.3.2.2 Test case descriptions.154 Annex A (informative): Cross reference matrix.325 Annex B (informative): Description of ISO/IEC 9646 Test Methodology.341 B.1 Overview of the structure of the ISO/IEC 9646 [7] Test-Suites.341 B.2 Test case description.341 B.3 Queue action.343 B.4 Repeat construct.343 B.5 Macro definitions.344 B.6 Test case naming.344 Annex C (informative): Bibliography.345 History.351
ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 8
Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM). The present document is part 2 of a multi-part deliverable covering the VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment, as identified below: Part 1: "EN for ground equipment"; Part 2: "General description and data link layer"; Part 3: "Additional broadcast aspects"; Part 4: "Point-to-point functions"; Part 5: "VDL 4 ground-based equipment compliance with the SES 552/2004 interoperability Regulation"; Part 6: "Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive". The present document is accompanied by an equivalent airborne standard, EN 302 842 [13] parts 1 to 5, covering the VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for airborne equipment.
National transposition dates Date of adoption of this EN: 24 November 2006 Date of latest announcement of this EN (doa): 28 February 2007 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 August 2007 Date of withdrawal of any conflicting National Standard (dow): 31 August 2007
ETSI ETSI EN 301 842-2 V1.5.1 (2006-11) 9
Introduction The present document is part of a set of standards developed by ETSI a
...