SIST EN 301 842-2 V1.3.1:2006

• Abstract:

  The present document states part 2 of the minimum performance requirements for VHF Datalink Mode 4 (VDL Mode 4) ground station equipment intended to be used for air-ground data communications, operating in the VHF band (117,975 MHz to 136,975 MHz and optionally 112,000 MHz to 117,975 MHz) allocated to the aeronautical mobile service. The equipment is also intended to be interoperable with mobile equipment supporting air-air data communications. It 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) and VDL Mode 4 Technical Manual (TM) [1]. Manufacturers should note that all or part of the frequency band 108,000 MHz to 117,975 MHz might become available for aeronautical communications. The present document applies to Gaussian-filtered Frequency Shift Keying (GFSK) systems, with channel separations of 25 kHz intended for air-ground communications. The scope of the present document is limited to ground base stations.; The VDL 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-air and ground-air 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.

• Status: Published
• Publication Date: 28-Feb-2006
• 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: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2006
• Due Date: 01-Mar-2006
• Completion Date: 01-Mar-2006
• Mandate: M/239
• Ref Project: ETSI EN 301 842-2 V1.3.1 (2005-04) - 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

SIST EN 301 842-2 V1.3.1:2006 is the Slovenian adoption of ETSI EN 301 842-2 Version 1.3.1 for VHF air-ground Data Link (VDL) Mode 4 ground-based equipment. It specifies the data link layer for VDL Mode 4 ground stations used for air-ground data communications in the aeronautical mobile service, with interoperability aimed at ICAO VDL standards and the VDL Mode 4 Technical Manual. The document is for manufacturers, test labs, and organizations that need to design, verify, or procure compatible ground station equipment.

What does SIST EN 301 842-2 V1.3.1:2006 specify?

SIST EN 301 842-2 V1.3.1:2006 specifies the data link layer for VDL Mode 4 ground station equipment. Its scope is limited to ground base stations operating in the VHF band for air-ground data communications, with GFSK systems and 25 kHz channel separations.

The standard is organized into:

• Clause 1 - Scope
• Clause 2 - References
• Clause 3 - Definitions and abbreviations
• Clause 4 - General description of VDL Mode 4 ground station link layer
• Clause 5 - Minimum performance specification under standard test conditions
• Clause 6 - General design requirements
• Clause 7 - Protocol test procedures
• Annex B - ISO/IEC 9646 test-suite structure and test-case conventions

The scope also places the ground station in a wider VDL environment. It refers to broadcast and point-to-point communication, ADS-B, TIS-B, FIS-B, air-air and ground-air services, and operation without ground infrastructure, but the document itself stays focused on the ground station side.

What are the key requirements of SIST EN 301 842-2 V1.3.1:2006?

SIST EN 301 842-2 V1.3.1:2006 sets out how a VDL Mode 4 ground station must handle access, timing, burst formats, reservations, network entry, and position reporting. Clause 5 is the core of the technical content, and Clause 7 shows how those behaviors are tested.

MAC and VSS behavior

Clause 5.1 defines the MAC sublayer behavior. The MAC sublayer must acquire the shared communication path, accept transmit bursts from the VSS sublayer, forward received bursts upward with slot status and signal level information, and only start transmission at a slot boundary. It must discard bursts with an invalid Cyclic Redundancy Code (CRC), which matters in practice because timing and error handling determine whether the station behaves predictably on a busy channel.

Clause 5.2 defines the VSS sublayer services and burst structure. The burst structure carries a version number, source address, message ID, information field, reservation fields, and an autonomous or directed flag. The standard also requires the station to recognize all reservation types and to discard unrecognized or invalid reservations, which is important for interoperability and for avoiding unsafe or confusing channel behavior.

Access control, reservation handling, and quality of service

Clause 5.2 also defines the reservation protocols and access modes. It covers reserved access, random access, fixed access, null reservation, periodic broadcast, incremental broadcast, combined periodic and incremental broadcast, BND broadcast, unicast request, information transfer request, directed request, block reservation, response, general request, and general response. In practice, this means implementers must support multiple ways of claiming or using slots, not just one transmission pattern.

The VSS parameters include VS1, VS2, VS4, VS5 and quality-of-service parameters Q1 to Q4. These parameters control items such as ground quarantined slots, minimum CCI performance, quarantine slot reuse range, maximum burst length, priority, slot selection range, replacing queued data, and the number of available slots. For a designer or test engineer, these are the knobs that determine how the station schedules traffic and protects channel usage.

Clause 5.2 also includes procedures for received transmission processing. A station must identify the appropriate user for a burst when possible, pass up received signal quality and receipt time, and process or reject bursts according to reservation type and subfield validity. That matters because the ground station is not only sending data - it must also classify and handle what it hears correctly.

Synchronization, ground timing, and network entry

Clause 5.4 covers the Link Management Entity (LME) sublayer. It supports broadcast services, synchronization burst formats, fixed and variable data fields, control parameter formats, the Peer Entity Contact Table (PECT), and network entry procedures. Additional material for ADS-B applications is also included through information field formats and an ADS-B request format.

This part matters because VDL Mode 4 is time-based. The ground station must maintain synchronization, exchange control information, and manage network entry so that the station can join and remain aligned with the channel structure.

Ground-station-specific requirements

Clause 5.5 adds requirements that are specific to ground stations. It covers maintenance of Primary time, coordination between ground stations, network timing, application interfaces, transmission control, superframe block reservation rebroadcast, fixed transmission parameters, and protection of fixed access protocol transmissions by ground quarantine or by appropriate reservation protocols. It also limits autotune reservations, sets transmission time rules for autotune reservations, and requires reporting of channel usage.

In practice, these requirements matter because a ground station must fit into a managed network, not just transmit on its own. The document makes the ground station responsible for protecting fixed transmissions and for coordinating with the rest of the VDL environment.

Compact position reporting

Clause 5.6 defines compact position reporting. It gives parameter symbols, data types, constants, variables, functions, patch constants, and procedures for fixed data field position encoding, local decoding, and global decoding. It also covers transition level straddling and position report processing.

For implementers, this section is where position information becomes a consistent coded message. That is important for surveillance applications, where the same position report must be encoded, interpreted, and forwarded the same way by different systems.

Design and verification

Clause 6 gives general design requirements such as controls and indicators, warm-up behavior, software management, recovery from failure, and monitoring of proper operation. Clause 7 then turns those requirements into protocol test procedures, including test conditions, test equipment precautions, ambient conditions, a required test rig, and detailed protocol test cases.

That split matters in practice: Clause 6 tells you how the equipment should be built and managed, while Clause 7 tells you how it is checked.

What terms does SIST EN 301 842-2 V1.3.1:2006 define?

• Gaussian-filtered Frequency Shift Keying (GFSK) - The modulation used by the standard for VDL Mode 4 air-ground communications.
• Medium Access Control (MAC) sublayer - The layer that manages access to the shared channel and timing of transmissions.
• Link Management Entity (LME) - The part of the system that handles synchronization, network entry, and related control functions.
• Automatic Dependent Surveillance-Broadcast (ADS-B) - A broadcast surveillance application supported by the VDL Mode 4 services.
• Peer Entity Contact Table (PECT) - The table used by the LME to keep track of peer contacts for network management.
• Cyclic Redundancy Code (CRC) - The error-detection check used to reject invalid received bursts.
• M1 - The parameter for the number of slots per superframe.
• Q1 - The priority parameter used by the VSS quality-of-service rules.

Who uses SIST EN 301 842-2 V1.3.1:2006?

SIST EN 301 842-2 V1.3.1:2006 is used by people who design, build, test, approve, or buy VDL Mode 4 ground station equipment. The main users are manufacturer engineering teams, test laboratories, certification and compliance teams, and aeronautical communications specialists.

It is also relevant to quality managers and buyers who need to check whether a ground station implementation supports the required data link behavior, timing, reservation handling, and testable performance rules. Because the document includes detailed protocol test procedures, it is especially useful when equipment must be verified against a repeatable test plan rather than judged only by design intent.

Which standards are used with SIST EN 301 842-2 V1.3.1:2006?

• ICAO VHF Digital Link (VDL) Standards and Recommended Practices (SARPs) - The standard is written to be compatible with these aeronautical rules.
• VDL Mode 4 Technical Manual (TM) - The document uses this manual as part of the intended interoperability framework.
• Aeronautical Telecommunication Network (ATN) - Clause 4 places VDL Mode 4 as an Air/Ground subsystem within the ATN context.
• EN 301 842-3 [9] - Referenced for broadcast services material used in ADS-B applications.
• ISO/IEC 9646 - Used in Annex B for test-suite structure and test-case description conventions.

What does the SIST EN 301 842-2 V1.3.1:2006 document contain?

The document contains burst-format definitions, parameter tables, protocol rules, and detailed processing procedures for the VDL Mode 4 data link layer. It includes the MAC, VSS, DLS, and LME sublayers, plus ground-station-specific rules for timing, coordination, and channel protection.

It also includes the compact position reporting material, with encoding and decoding methods and the associated input parameters and calculations. Clause 7 adds protocol test procedures with equipment setup, ambient conditions, test-suite methodology, and many detailed test cases for reservations, random access, periodic and incremental broadcast, congestion, and response behavior.

Annex B describes the ISO/IEC 9646 test-suite structure, including test case descriptions, queue action, repeat constructs, macro definitions, and test-case naming.

SLOVENSKI STANDARD
01-marec-2006
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5DGLMVNDRSUHPD]DSRGDWNRYQRSRYH]DYR9+)]UDNWODQDþLQ±7HKQLþQH
NDUDNWHULVWLNHLQPHULOQHPHWRGH]DWDOQRRSUHPR±GHO3ODVWSRGDWNRYQLK
SRYH]DY
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
Ta slovenski standard je istoveten z: EN 301 842-2 Version 1.3.1
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
35.100.20 Podatkovni povezovalni sloj Data link layer
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)

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
2 ETSI EN 301 842-2 V1.3.1 (2005-04)

Reference
REN/ERM-TG25-023
Keywords
aeronautical, digital, radio, testing, VHF
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ETSI
3 ETSI EN 301 842-2 V1.3.1 (2005-04)
Contents
Intellectual Property Rights.8
Foreword.8
Introduction .9
1 Scope.10
2 References.11
3 Definitions and abbreviations.12
3.1 Definitions.12
3.1.1 Basic reference model definitions.12
3.1.2 Service conventions definitions .13
3.1.3 General definitions.13
3.2 Abbreviations.16
4 General description of VDL Mode 4 ground station link layer.17
4.1 General.17
4.1.1 Overview of VDL Mode 4.17
4.1.2 Relationship to OSI reference model.18
4.1.3 VDL Mode 4 services .20
4.1.4 ADS-B Function.20
4.1.5 Operational scenarios.21
4.1.6 VDL Mode 4 fundamentals .21
4.1.7 Possible configuration of ground equipment .22
4.1.8 Overall structure of specifications for VDL Mode 4 .22
4.1.9 Equipment performance verification .24
4.2 Ground quarantine.25
4.3 System timing.25
4.4 Net entry.25
4.5 Autotune capability.25
4.6 Autonomous and fixed access .26
5 Minimum performance specification under standard test conditions.26
5.1 MAC sublayer.26
5.1.1 Services.26
5.1.2 MAC sublayer services.26
5.1.3 MAC sublayer parameters .26
5.1.3.1 General.26
5.1.3.2 Parameter M1 (number of slots per superframe).27
5.1.4 Time synchronization.27
5.1.4.1 Primary.27
5.1.4.2 Secondary.27
5.1.4.3 Alignment to UTC second .27
5.1.4.4 Data quality level.27
5.1.5 Slot idle/busy notification.27
5.1.5.1 Slot idle detection.27
5.1.5.2 Slot busy detection .28
5.1.5.3 Slot occupied detection .28
5.1.5.4 Signal level indication.28
5.1.6 Transmission processing.28
5.1.7 Received transmission processing .28
5.2 VSS sublayer.28
5.2.1 Services.28
5.2.1.1 Error detection.28
5.2.1.2 Channel congestion.29
5.2.2 Burst format.29
5.2.2.1 VSS burst structure.29
5.2.2.2 Version number.29
ETSI
4 ETSI EN 301 842-2 V1.3.1 (2005-04)
5.2.2.3 Source address.30
5.2.2.4 Message ID.30
5.2.2.5 Information field.30
5.2.2.6 Reservation fields.31
5.2.2.7 Autonomous/directed flag.31
5.2.3 VSS sublayer parameters .32
5.2.3.1 General.32
5.2.3.2 Parameter VS1 (number of ground quarantined slots) .32
5.2.3.3 Parameter VS2 (minimum CCI performance).33
5.2.3.4 Parameter VS4 (quarantine slot re-use range).33
5.2.3.5 Parameter VS5 (maximum burst length).33
5.2.4 VSS quality of service parameters.33
5.2.4.1 General.33
5.2.4.2 Parameter Q1 (priority) .34
5.2.4.3 Parameters Q2a to Q2d (slot selection range constraint for level n) .34
5.2.4.4 Parameter Q3 (replace queued data) .35
5.2.4.5 Parameter Q4 (number of available slots).35
5.2.5 Received transmission processing .35
5.2.6 Reserved access protocol specification.36
5.2.6.1 Reservation table.36
5.2.6.2 Selecting slots for transmission or reservation.36
5.2.6.3 Reserved transmissions.37
5.2.6.4 Reservation conflicts.37
5.2.7 Random access protocol specification .38
5.2.7.1 General.38
5.2.7.2 Random access parameters.38
5.2.7.3 Random access procedures.39
5.2.8 Fixed access protocol specification .40
5.2.8.1 General.40
5.2.8.2 Recommendation.40
5.2.9 Null reservation protocol specification.40
5.2.9.1 Null reservation burst format .40
5.2.10 Periodic broadcast protocol specification .40
5.2.10.1 Periodic broadcast reservation burst format.40
5.2.10.2 Periodic broadcast timers.41
5.2.10.3 Periodic broadcast parameters.41
5.2.10.4 Periodic broadcast reception procedures.42
5.2.10.5 Periodic broadcast transmission procedures.43
5.2.11 Incremental broadcast protocol specification .44
5.2.11.1 Incremental broadcast reservation burst format .44
5.2.11.2 Incremental broadcast parameters.45
5.2.11.3 Incremental broadcast reception procedures .45
5.2.11.4 Incremental broadcast transmission procedures.46
5.2.12 Combined periodic broadcast and incremental broadcast protocol specification .46
5.2.12.1 Combined periodic broadcast and incremental broadcast reservation burst.46
5.2.13 Big negative dither (BND) broadcast protocol specifications .47
5.2.13.1 BND reservation burst format.47
5.2.13.2 BND broadcast parameters.47
5.2.13.3 BND broadcast reception procedures.47
5.2.14 Unicast request protocol specification .47
5.2.14.1 Unicast request reservation burst format.47
5.2.14.2 Unicast request reception procedures.48
5.2.14.3 Slot selection criteria for unicast request with sdf = 1 .49
5.2.15 Information transfer request protocol specification .49
5.2.15.1 Information transfer request reservation burst format.49
5.2.15.2 Information transfer request reception procedures.50
5.2.16 Directed request protocol specification.50
5.2.16.1 Directed request reservation burst format .50
5.2.16.2 Directed request parameters.54
5.2.16.3 Directed request reception procedures .54
5.2.16.4 Directed request transmission procedures.56
5.2.17 Block reservation protocols specification.57
ETSI
5 ETSI EN 301 842-2 V1.3.1 (2005-04)
5.2.17.1 Superframe block reservation burst format .57
5.2.17.2 Second frame block reservation burst format.58
5.2.17.3 Superframe block reservation parameters .58
5.2.17.4 Superframe block reservation reception procedures .59
5.2.17.5 Second frame block reservation parameters.59
5.2.17.6 Second frame block reservation reception procedures.60
5.2.17.7 Superframe block reservation transmission procedures .61
5.2.17.8 Second frame block reservation transmission procedures.61
5.2.18 Response protocol specification .62
5.2.18.1 Response burst format.62
5.2.19 General request protocol specification.62
5.2.19.1 General request burst format.62
5.2.19.2 General request procedures .63
5.2.20 General response protocol specification .63
5.2.20.1 General response burst format.63
5.2.20.2 General response procedures.64
5.3 DLS sublayer.65
5.3.1 Services.65
5.3.1.1 General.65
5.3.1.2 Data transfer.65
5.3.1.3 Station address encoding.65
5.3.1.4 DLS burst formats.66
5.3.2 DLS system parameters.67
5.3.2.1 Parameter ND4 (maximum length of a UDATA burst) .68
5.3.3 DLS procedures.68
5.3.3.1 Broadcast.68
5.3.3.2 DLS not supported.68
5.3.3.3 User data packet reception .68
5.4 Link Management Entity sublayer .68
5.4.1 Services.68
5.4.2 Synchronization burst format.68
5.4.2.1 General.68
5.4.2.2 Fixed and variable data fields.69
5.4.2.3 Fixed data field format .69
5.4.2.4 Variable data field format .72
5.4.2.5 Synchronization burst request .72
5.4.2.6 Link management burst.72
5.4.3 Control (CTRL) parameter formats .73
5.4.3.1 Encoding.73
5.4.3.2 VDL Mode 4 parameter identification .73
5.4.3.3 Ground-initiated modification parameters .74
5.4.3.4 Ground-initiated information parameters.75
5.4.4 LME procedures.78
5.4.4.1 Synchronization burst procedures .78
5.4.4.2 Peer entity contact table (PECT).79
5.4.4.3 Network entry protocol specifications .80
5.4.5 Additional material for ADS-B applications .81
5.4.5.1 Information field formats.81
5.4.5.2 ADS-B request format.81
5.5 Additional requirements for ground stations .81
5.5.1 System timing requirements .81
5.5.1.1 Maintenance of Primary time.81
5.5.2 Ground station interface requirements.82
5.5.2.1 Ground station coordination.82
5.5.2.2 Network timing requirements.82
5.5.2.3 Application interface requirements .82
5.5.2.4 Transmission control requirements .82
5.5.2.5 Superframe block reservation rebroadcast procedures.83
5.5.2.6 Fixed transmission parameters .83
5.5.2.7 Protection of fixed access protocol transmissions by ground quarantine.83
5.5.2.8 Protection of fixed access protocol transmissions by use of appropriate reservation protocols.83
5.5.2.9 Restriction of autotune reservations.84
ETSI
6 ETSI EN 301 842-2 V1.3.1 (2005-04)
5.5.2.10 Transmission time for autotune reservations.84
5.5.2.11 Reporting of channel usage.84
5.6 Definitions for compact position reporting .84
5.6.1 Introduction.84
5.6.2 Parameter symbols, data types, constants and variables .84
5.6.2.1 Parameter symbols.84
5.6.2.2 Data types.85
5.6.2.3 Constants.85
5.6.2.4 Variables.85
5.6.2.5 Functions.86
5.6.2.6 Patch constants.87
5.6.3 Fixed data field position encoding.89
5.6.3.1 General.89
5.6.3.2 Input parameters.89
5.6.3.3 Calculations.89
5.6.4 Fixed data field position local decoding .89
5.6.4.1 General.89
5.6.4.2 Input parameters.90
5.6.4.3 Calculations.90
5.6.5 Fixed data field position global decoding.91
5.6.5.1 General.91
5.6.5.2 Input parameters.91
5.6.5.3 Transition level straddling.91
5.6.5.4 Calculations.92
5.6.6 Position report processing.92
5.6.6.1 Services.92
5.6.6.2 Position report parameters.92
5.6.6.3 Position report processing procedures.93
6 General design requirements.95
6.1 Controls and indicators.95
6.2 Operation of controls.95
6.3 Warm up.95
6.4 Effects of tests .95
6.5 Software management.96
6.6 Recovery from failure .96
6.6.1 Failure of the VDL equipment.96
6.7 Monitoring of proper operation .96
7 Protocol test procedures.96
7.1 General.96
7.1.1 Input voltage.96
7.1.2 Power input frequency.96
7.1.3 Adjustment of equipment.97
7.1.4 Equipment configuration.97
7.1.5 Test equipment.97
7.1.6 Test equipment precautions .97
7.1.7 Ambient conditions.97
7.1.8 Connected loads.97
7.1.9 Warm-up period.97
7.2 Required test rig .97
7.3 Protocol test-suite description methodology .100
7.4 Detailed protocol test procedures .100
7.4.1 Test-suite overview.100
7.4.2 Declarations.104
7.4.3 Constraints.105
7.4.3.1 Abbreviations.105
7.4.3.1.1 Subfield mnemonics.105
7.4.3.1.2 Special characters used in the subfield definitions .106
7.4.3.1.3 Station addresses and positions .106
7.4.3.1.4 Tables of values for use in CPR test cases .108
7.4.3.1.5 Tables of values for use in content checking test cases .118
ETSI
7 ETSI EN 301 842-2 V1.3.1 (2005-04)
7.4.3.1.6 VDL4 burst formats.121
7.4.3.2 Test cases.138
7.4.3.2.1 Test case macros.139
7.4.3.2.2 Test case descriptions .141
Annex A (informative): Cross reference matrix .307
Annex B (informative): Description of ISO/IEC 9646 Test Methodology.322
B.1 Overview of the structure of the ISO/IEC 9646 Test-Suites.322
B.2 Test case description.322
B.3 Queue action.324
B.4 Repeat construct.324
B.5 Macro definitions.325
B.6 Test case naming.325
Annex C (informative): Bibliography.326
History .331

ETSI
8 ETSI EN 301 842-2 V1.3.1 (2005-04)
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 Data Link (VDL) Mode 4 radio
equipment; Technical characteristics and methods of measurement for ground-based equipment, as identified below:
Part 1: "General description and physical layer";
Part 2: "Data link layer";
Part 3: "Additional broadcast aspects";
Part 4: "Point-to-point functions".
The present document is accompanied by an equivalent airborne standard, EN 302 842 Parts 1 to 4, covering the VHF
air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for
airborne equipment.
National transposition dates
Date of adoption of this EN: 6 August 2004
Date of latest announcement of this EN (doa): 30 November 2004
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2005
Date of withdrawal of any conflicting National Standard (dow): 31 May 2005

ETSI
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