SIST EN 302 842-4 V1.3.1:2015

VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment;Part 4: Point-to-point functions

The present document applies to the following radio equipment types:
• Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air 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 VDL SARPs [2].
The present document provides part 4 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 [2] and ICAO VDL4 Technical Manual [1].
Manufacturers should note that in future the tuning range for the transmitter and receiver may also cover any 25 kHz channel from 108,000 MHz to 111,975 MHz.
The present document applies to "aeronautical mobile (airborne and as applicable also ground vehicles)" equipment which will hereinafter be referred to as "mobile" equipment.
The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is ETSI EN 301 842 [i.1].
A description of the scope of the VDL Mode 4 system is provided in part 2 of ETSI EN 302 842-2 [6], clause 1. ETSI EN 302 842-1 [5] deals with tests of the physical layer, ETSI EN 302 842-2 [6] deals with core link layer functionality and ETSI EN 302 842-3 [7] with additional broadcast functionality. The present document deals with tests of the datalink layer (DLS) and the link layer sufficient to support point-to-point functionality. Note that, as described in ETSI EN 302 842-2 [6], a system supporting point-to-point functionality is required to conform to ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6] and the specification in the present document.
The present document is organized as follows:
• clause 2 provides references to relevant documents;
• clause 3 provides general definitions, abbreviations and symbols used;
• clause 4 describes the VDL Mode 4 mobile station point-to-point functions;
• clause 5 provides performance specifications for the VDL Mode 4 mobile station;
• clause 6 provides general design requirements;
• clause 7 provides protocol tests for the point-to-point functions of the system;
• annex A provides a detailed cross-reference to the relevant requirements contained in ICAO VDL4 Technical Manual [1].
Note that the system can support a very wide range of functions. It is not practical to provide specific tests for all aspects of functionality. The approach used is to provide detailed tests for the core point-to-point 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.
Mandating and Recommendation Phrases
a) "Shall":
- The use of the word "Shall" indicates a mandated criterion; i.e. compliance with the particular procedure or specification is mandatory and no alternative may be applied.
b) "Should":
- The use of the word "Should" (and phrases such as "It is recommended that...", etc.) indicates that though the procedure or criterion is regarded as the preferred option, alternative procedures, specifications or criteria may be applied, provided that the manufacturer, installer or tester can provide information or data to adequately support and justify the alternative.

Radijska oprema za digitalno povezavo VHF zrak-tla in zrak-zrak, 4. način - Tehnične karakteristike in merilne metode za aeronavtično mobilno (letalsko) opremo - 4. del: Funkcije sistema točka-točka

Ta dokument se uporablja za radijsko opremo naslednjih vrst:
• aeronavtične mobilne (letalske) radijske oddajnike, oddajnike-sprejemnike in sprejemnike za zelo visokofrekvenčno (VHF) digitalno povezavo (VDL) za komunikacije zrak-tla in zrak-zrak, 4. način, ki delujejo v pasu VHF z uporabo modulacije frekvenčnega premičnega kodiranja prek filtra Gaussian (GFSK) z razmikom 25 kHz med kanali in so zmožni uravnavati na katerem koli izmed kanalov 25 kHz od 112.000 MHz do 136.975 MHz, kot je opredeljeno v standardih in priporočenih praksah (SARP) [2] ICAO za digitalne povezave (VDL).
Ta dokument vsebuje 4. del tehničnih specifikacij.
Ta dokument zagotavlja, da bo oprema, ki bo certificirana v skladu z njim, združljiva z ustreznimi standardi (SARP) [2] ICAO za VDL in tehničnim priročnikom ICAO za VDL4 [1].
Proizvajalci naj bodo pozorni, da razpon uravnavanja za oddajnik in sprejemnik lahko v prihodnje zajema tudi kateri koli kanal 25 kHz od 108.000 MHz do 111.975 MHz.
Ta dokument se nanaša na »aeronavtično mobilno (letalska in v nekaterih primerih tudi kopenska vozila)« opremo, v nadaljnjem besedilu: »mobilna« oprema.
Področje uporabe tega dokumenta je omejeno na mobilne postaje. Enakovredna specifikacija za kopenske postaje je ETSI EN 301 842 [i.1].
Opis področja uporabe sistema VDL, 4. način, je naveden v 2. delu standarda ETSI EN 302 842-2 [6], 1. točka. Standard ETSI EN 302 842-1 [5] obravnava preskuse fizične plasti, standard ETSI EN 302 842-2 [6] obravnava temeljno funkcionalnost podatkovne povezave, standard ETSI EN 302 842-3 [7] pa dodatno funkcionalnost v zvezi z radiodifuzijo. Ta dokument obravnava preskuse plasti podatkovnih povezav (DLS) in plasti povezav, ki zadostujejo za podporo funkcij točka-točka. Upoštevati je treba, da mora biti, kot je opisano v dokumentu ETSI EN 302 842-2 [6], sistem, ki podpira funkcije točka-točka, v skladu z dokumentoma ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6] in s specifikacijo v tem dokumentu.
Ta dokument je organiziran na naslednji način:
• točka 2 vsebuje sklice do ustreznih dokumentov;
• točka 3 vsebuje splošne opredelitve, kratice in simbole, ki se uporabljajo;
• točka 4 opisuje funkcije točka-točka mobilne postaje VDL, 4. način;
• točka 5 vsebuje specifikacije lastnosti mobilnih postaj VDL, 4. način;
• točka 6 vsebuje splošne zahteve projekta;
• točka 7 vsebuje preskuse protokolov za funkcije točka-točka sistema;
• dodatek A vsebuje podrobne sklice do ustreznih zahtev, ki so vključene v tehničnem priročniku ICAO za VDL4 [1];
Upoštevati je treba, da lahko sistem podpira zelo širok nabor funkcij. Podajanje določenih preskusov za celoten nabor funkcij ni praktično. Tako so podani podrobni preskusi za osrednje funkcije točka-točka in preskusi tistih preostalih zahtev, ki lahko v primeru nepravilnega izvajanja povzročijo poslabšanje storitve, ki jo zagotavljajo druge postaje VDL, 4. način.
Izražanje zahtev in priporočil
a) »Je treba«:
– uporaba izraza »je treba« pomeni obvezno merilo, tj. skladnost z določenim postopkom ali specifikacijo je nujna, pri čemer uporaba alternativ ni dovoljena.
b) »Naj bi«:
– uporaba izraza »naj bi« (in izrazov, kot je »priporočljivo je, da ...« itd.) pomeni, da se lahko namesto postopka ali merila, ki je sicer obravnavano kot prednostno, uporabijo tudi alternativni postopki, specifikacije ali merila, če lahko proizvajalec, monter ali preizkuševalec zagotovi informacije ali podatke, ki ustrezno podpirajo in upravičujejo alternativo.

General Information

• Status: Published
• Public Enquiry End Date: 30-Mar-2015
• Publication Date: 08-Sep-2015
• ICS: 33.060.99 - Other equipment for radiocommunications
• ICS: 49.090 - On-board equipment and instruments
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 02-Jun-2015
• Due Date: 07-Aug-2015
• Completion Date: 09-Sep-2015
• Ref Project: ETSI EN 302 842-4 V1.3.1 (2015-04) - VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 4: Point-to-point functions

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment;Part 4: Point-to-point functions49.090On-board equipment and instruments33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 302 842-4 V1.3.1SIST EN 302 842-4 V1.3.1:2015en,fr,de01-oktober-2015SIST EN 302 842-4 V1.3.1:2015SLOVENSKI
STANDARD



SIST EN 302 842-4 V1.3.1:2015



ETSI EN 302 842-4 V1.3.1 (2015-04) VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 4: Point-to-point functions
EUROPEAN STANDARD SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 2
Reference REN/AERO-00019-4 Keywords aeronautical, digital, radio, testing, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: [phone]
Fax: [phone]
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice The present document can be downloaded from: http://www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (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: https://portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2015. All rights reserved.
DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 3 Contents Intellectual Property Rights . 6 Foreword . 6 Modal verbs terminology . 6 Introduction . 7 1 Scope . 8 2 References . 9 2.1 Normative references . 9 2.2 Informative references . 9 3 Definitions and abbreviations . 10 3.1 Definitions . 10 3.1.1 Basic reference model definitions . 10 3.1.2 Service conventions definitions . 10 3.1.3 General definitions . 10 3.1.4 Definition of bit order . 10 3.2 Abbreviations . 10 4 General description of VDL Mode 4 mobile station point-to-point services . 12 4.1 General . 12 4.2 Data Link Service (DLS) and Link Management Entity (LME) . 12 4.2.1 General . 12 4.2.2 DLS timers . 15 4.2.3 DLS counters . 16 4.2.4 Toggle bit (T) . 16 4.2.5 State variables (Tt and Tr) . 16 4.2.6 Initialize Bit (IB) . 16 4.2.7 More bit (M) . 17 4.2.8 Priority (pr) . 17 4.2.9 Message fragmentation and concatenation . 17 4.2.10 DLS procedures . 17 4.2.10.1 Selection of DLS procedures. 17 4.2.10.2 Short transmission procedures . 17 4.2.10.3 Long transmission procedures . 18 4.2.11 Linking transmissions . 20 4.2.11.1 Types of linking . 20 4.2.11.2 Combined RTS / DATA DLPDUs . 20 4.2.11.3 Combined DATA / ACK DLPDUs . 20 4.2.11.4 Combined RTS / ACK DLPDUs . 20 4.2.11.5 Combined CTS / ACK DLPDUs . 20 4.2.12 Ground-air link management . 20 4.2.13 Air-air link management . 21 4.3 Additional VSS services . 21 5 Minimum performance specification under standard test conditions . 21 5.1 DLS sublayer . 21 5.1.1 General . 21 5.1.1.1 Services . 21 5.1.1.2 Data transfer . 22 5.1.1.3 DATA DLPDU duplicate suppression and sequencing . 22 5.1.1.4 Error detection . 22 5.1.1.5 Station identification . 22 5.1.1.6 Broadcast addressing . 22 5.1.1.7 DLS Priority . 23 5.1.1.8 DLS Link control DLPDUs . 23 5.1.2 DLS protocol specification . 23 5.1.2.1 State variables . 23 5.1.2.2 DLS burst formats . 23 SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 4 5.1.3 DLS system parameters . 27 5.1.4 DLS procedures . 29 5.1.4.1 Setting of re-transmission parameter . 29 5.1.4.2 Selection of user data packet for transmission . 29 5.1.4.3 Selection of transmission procedures . 31 5.1.4.4 Short transmission procedures . 31 5.1.4.5 Long transmission procedures . 32 5.1.4.6 No link with sender . 34 5.1.4.7 User data packet reception . 35 5.1.4.8 Receipt of ACK DLPDU . 35 5.1.4.9 Link reset . 36 5.1.4.10 Linking DLS DLPDU transmissions . 37 5.1.4.11 CTRL DLPDU . 38 5.1.4.12 Procedures for air-air communication . 38 5.2 Link management entity sublayer. 38 5.2.1 Services . 38 5.2.1.1 General . 38 5.2.1.2 Link provision . 39 5.2.1.3 Link change notifications . 39 5.2.1.4 CTRL DLPDU . 39 5.2.1.5 Broadcast link management burst . 40 5.2.2 Control (CTRL) parameter formats . 40 5.2.2.1 Encoding . 40 5.2.2.2 General purpose information parameters . 40 5.2.2.3 Mobile-initiated information parameters . 44 5.2.2.4 Ground-initiated modification parameters . 45 5.2.2.5 Ground-initiated information parameters . 48 5.2.3 LME timers and parameters . 50 5.2.3.1 General . 50 5.2.3.2 Timer TL1 (maximum link overlap time) . 51 5.2.3.3 Parameters TL2 (link initialization time) . 51 5.2.3.4 Timer TL4 (leave generation latency) . 51 5.2.4 CTRL DLPDU types and procedures . 51 5.2.5 CTRL transmission procedures . 55 5.2.5a Frequency management procedures . 55 5.2.5.1 Link connectivity procedures . 55 5.2.5.2 Ground Station Identification . 55 5.2.5.3 Link establishment . 56 5.2.5.4 Mobile-initiated handoff . 57 5.2.5.5 Mobile-requested ground-initiated handoff . 58 5.2.5.6 Ground-initiated handoff . 58 5.2.5.7 Ground-requested mobile-initiated handoff . 59 5.2.5.8 Ground-requested broadcast handoff . 59 5.2.5.9 Ground-commanded autotune . 60 5.2.6 VDL Mode 4 Mobile SubNetwork Dependent Convergence Function (SNDCF) . 60 5.2.6.1 Frame mode SNDCF . 60 5.3 Additional VSS requirements . 60 5.3.1 Information transfer request protocol specification . 60 5.3.1.1 Information transfer request parameters . 60 5.3.1.2 Information transfer request transmission procedures . 62 5.3.1.3 Information transfer request acknowledgement procedures . 62 5.3.2 Void . 62 5.3.3 Void . 62 5.3.4 Retransmission procedures . 63 6 General design requirements . 63 7 Protocol test procedures . 63 7.1 General . 63 7.2 Required test rig . 63 7.3 Protocol test-suite description methodology . 64 7.4 Detailed protocol test procedures . 64 SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 5 7.4.1 Test-suite overview . 64 7.4.2 Declarations . 67 7.4.3 Constraints . 67 7.4.3.1 Abbreviations . 67 7.4.3.1.1 Subfield mnemonics . 67 7.4.3.1.2 Special characters used in the subfield definitions . 68 7.4.3.1.3 Station addresses and positions . 68 7.4.3.1.4 VDL bursts . 69 7.4.3.2 Test cases . 95 7.4.3.2.1 Test case macros . 96 7.4.3.2.2 Test case descriptions . 98 Annex A (informative): Cross reference matrix . 172 History . 185
SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 6 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://ipr.etsi.org). 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 (EN) has been produced by ETSI Technical Committee Aeronautics (AERO). The present document is part 4 of a multi-part deliverable covering the VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment, as identified below: Part 1: "Physical layer"; Part 2: "General description and data link layer"; Part 3: "Additional broadcast aspects"; Part 4: "Point-to-point functions". The present document is accompanied by an equivalent ground-based standard, ETSI EN 301 842 [i.1] parts 1 to 5, covering the VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment. NOTE: Minimum Operational Performance Specifications (MOPS) are also being developed for VDL Mode 4. EUROCAE have previously published Interim MOPS for VDL Mode 4 [i.2] which are a sub set of ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and ETSI EN 302 842-4 (the present document). ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and ETSI EN 302 842-4 (the present document) comply with the requirements of EC Mandate M/318 [i.3].
National transposition dates Date of adoption of this EN: 6 April 2015 Date of latest announcement of this EN (doa): 31 July 2015 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 January 2016 Date of withdrawal of any conflicting National Standard (dow): 31 January 2017
Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation. SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 7 Introduction The present document states the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air 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 VDL SARPs [2]. The present document may be used to produce tests for the assessment of the performance of the equipment. The performance of the equipment submitted for type testing should be representative of the performance of the corresponding production model. The present document has been written on the assumption that: • the type test measurements will be performed only once, in an accredited test laboratory and the measurements accepted by the various authorities in order to grant type approval; • if equipment available on the market is required to be checked it will be tested in accordance with the methods of measurement specified in the present document or a documented alternative approved by the certifying authority; • equipment comply with ETSI EN 302 842-1 [5] and ETSI EN 302 842-2 [6]. NOTE: The present document has been produced with a view to maintaining consistency of numbering with the equivalent standard for ground equipment (ETSI EN 301 842 [i.1]). Where requirements are the same, they have been given the same number. Some new airborne requirements have been inserted between requirements that were sequential in ETSI EN 301 842 [i.1]. This has led to a non-standard form of numbering for new requirements in some places. SIST EN 302 842-4 V1.3.1:2015



ETSI ETSI EN 302 842-4 V1.3.1 (2015-04) 8 1 Scope The present document applies to the following radio equipment types: • Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air 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 VDL SARPs [2]. The present document provides part 4 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 [2] and ICAO VDL4 Technical Manual [1]. Manufacturers should note that in future the tuning range for the transmitter and receiver may also cover any 25 kHz channel from 108,000 MHz to 111,975 MHz. The present document applies to "aeronautical mobile (airborne and as applicable also ground vehicles)" equipment which will hereinafter be referred to as "mobile" equipment. The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is ETSI EN 301 842 [i.1]. A description of the scope of the VDL Mode 4 system is provided in part 2 of ETSI EN 302 842-2 [6], clause 1. ETSI EN 302 842-1 [5] deals with tests of the physical layer, ETSI EN 302 842-2 [6] deals with core link layer functionality and ETSI EN 302 842-3 [7] with additional broadcast functionality. The present document deals with tests of the datalink layer (DLS) and the link layer sufficient to support point-to-point functionality. Note that, as described in ETSI EN 302 842-2 [6], a system supporting point-to-point functionality is required to conform to ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6] and the specification in the present document. The present document is organized as follows: • clause 2 provides references to relevant documents; • clause 3 provides general definitions, abbreviations and symbols used; • clause 4 describes the VDL Mode 4 mobile station point-to-point functions; • clause 5 provides performance specifications for the VDL Mode 4 mobile station; • clause 6 provides general design requireme
...

ETSI EN 302 842-4 V1.3.1 (2015-04)






EUROPEAN STANDARD
VHF air-ground and air-air Digital Link (VDL)
Mode 4 radio equipment;
Technical characteristics and methods of measurement
for aeronautical mobile (airborne) equipment;
Part 4: Point-to-point functions

---------------------- Page: 1 ----------------------
2 ETSI EN 302 842-4 V1.3.1 (2015-04)



Reference
REN/AERO-00019-4
Keywords
aeronautical, digital, radio, testing, VHF
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (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:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2015.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 ETSI EN 302 842-4 V1.3.1 (2015-04)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 7
1 Scope . 8
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definitions and abbreviations . 10
3.1 Definitions . 10
3.1.1 Basic reference model definitions . 10
3.1.2 Service conventions definitions . 10
3.1.3 General definitio ns . 10
3.1.4 Definition of bit order . 10
3.2 Abbreviations . 10
4 General description of VDL Mode 4 mobile station point-to-point services . 12
4.1 General . 12
4.2 Data Link Service (DLS) and Link Management Entity (LME) . 12
4.2.1 General . 12
4.2.2 DLS timers . 15
4.2.3 DLS counters . 16
4.2.4 Toggle bit (T) . 16
4.2.5 State variables (T and T ) . 16
t r
4.2.6 Initialize Bit (IB) . 16
4.2.7 More bit (M) . 17
4.2.8 Priority (pr) . 17
4.2.9 Message fragmentation and concatenation . 17
4.2.10 DLS procedures . 17
4.2.10.1 Selection of DLS procedures. 17
4.2.10.2 Short transmission procedures . 17
4.2.10.3 Long transmission procedures . 18
4.2.11 Linking transmissions . 20
4.2.11.1 Types of linking . 20
4.2.11.2 Combined RTS / DATA DLPDUs . 20
4.2.11.3 Combined DATA / ACK DLPDUs . 20
4.2.11.4 Combined RTS / ACK DLPDUs . 20
4.2.11.5 Combined CTS / ACK DLPDUs . 20
4.2.12 Ground-air link management . 20
4.2.13 Air-air link management . 21
4.3 Additional VSS services . 21
5 Minimum performance specification under standard test conditions . 21
5.1 DLS sublayer . 21
5.1.1 General . 21
5.1.1.1 Services . 21
5.1.1.2 Data transfer . 22
5.1.1.3 DATA DLPDU duplicate suppression and sequencing . 22
5.1.1.4 Error detection . 22
5.1.1.5 Station identification . 22
5.1.1.6 Broadcast addressing . 22
5.1.1.7 DLS Priority . 23
5.1.1.8 DLS Link control DLPDUs . 23
5.1.2 DLS protocol specification . 23
5.1.2.1 State variables . 23
5.1.2.2 DLS burst formats . 23
ETSI

---------------------- Page: 3 ----------------------
4 ETSI EN 302 842-4 V1.3.1 (2015-04)
5.1.3 DLS system parameters . 27
5.1.4 DLS procedures . 29
5.1.4.1 Setting of re-transmission parameter . 29
5.1.4.2 Selection of user data packet for transmission . 29
5.1.4.3 Selection of transmission procedures . 31
5.1.4.4 Short transmission procedures . 31
5.1.4.5 Long transmission procedures . 32
5.1.4.6 No link with sender . 34
5.1.4.7 User data packet reception . 35
5.1.4.8 Receipt of ACK DLPDU . 35
5.1.4.9 Link reset . 36
5.1.4.10 Linking DLS DLPDU transmissions . 37
5.1.4.11 CTRL DLPDU . 38
5.1.4.12 Procedures for air-air communication . 38
5.2 Link management entity sublayer. 38
5.2.1 Services . 38
5.2.1.1 General . 38
5.2.1.2 Link provision . 39
5.2.1.3 Link change notifications . 39
5.2.1.4 CTRL DLPDU . 39
5.2.1.5 Broadcast link management burst . 40
5.2.2 Control (CTRL) parameter formats . 40
5.2.2.1 Encoding . 40
5.2.2.2 General purpose information parameters . 40
5.2.2.3 Mobile-initiated information parameters . 44
5.2.2.4 Ground-initiated modification parameters . 45
5.2.2.5 Ground-initiated information parameters . 48
5.2.3 LME timers and parameters . 50
5.2.3.1 General . 50
5.2.3.2 Timer TL1 (maximum link overlap time) . 51
5.2.3.3 Parameters TL2 (link initialization time) . 51
5.2.3.4 Timer TL4 (leave generation latency) . 51
5.2.4 CTRL DLPDU types and procedures . 51
5.2.5 CTRL transmission procedures . 55
5.2.5a Frequency management procedures . 55
5.2.5.1 Link connectivity procedures . 55
5.2.5.2 Ground Station Identification . 55
5.2.5.3 Link establishment . 56
5.2.5.4 Mobile-initiated handoff . 57
5.2.5.5 Mobile-requested ground-initiated handoff . 58
5.2.5.6 Ground-initiated handoff . 58
5.2.5.7 Ground-requested mobile-initiated handoff . 59
5.2.5.8 Ground-requested broadcast handoff . 59
5.2.5.9 Ground-commanded autotune . 60
5.2.6 VDL Mode 4 Mobile SubNetwork Dependent Convergence Function (SNDCF) . 60
5.2.6.1 Frame mode SNDCF . 60
5.3 Additional VSS requirements . 60
5.3.1 Information transfer request protocol specification . 60
5.3.1.1 Information transfer request parameters . 60
5.3.1.2 Information transfer request transmission procedures . 62
5.3.1.3 Information transfer request acknowledgement procedures . 62
5.3.2 Void . 62
5.3.3 Void . 62
5.3.4 Retransmission procedures . 63
6 General design requirements . 63
7 Protocol test procedures . 63
7.1 General . 63
7.2 Required test rig . 63
7.3 Protocol test-suite description methodology . 64
7.4 Detailed protocol test procedures . 64
ETSI

---------------------- Page: 4 ----------------------
5 ETSI EN 302 842-4 V1.3.1 (2015-04)
7.4.1 Test-suite overview . 64
7.4.2 Declarations . 67
7.4.3 Constraints . 67
7.4.3.1 Abbreviations . 67
7.4.3.1.1 Subfield mnemonics . 67
7.4.3.1.2 Special characters used in the subfield definitions . 68
7.4.3.1.3 Station addresses and positions . 68
7.4.3.1.4 VDL bursts . 69
7.4.3.2 Test cases . 95
7.4.3.2.1 Test case macros . 96
7.4.3.2.2 Test case descriptions . 98
Annex A (informative): Cross reference matrix . 172
History . 185

ETSI

---------------------- Page: 5 ----------------------
6 ETSI EN 302 842-4 V1.3.1 (2015-04)
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://ipr.etsi.org).
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 (EN) has been produced by ETSI Technical Committee Aeronautics (AERO).
The present document is part 4 of a multi-part deliverable covering the VHF air-ground and air-air Digital Link (VDL)
Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne)
equipment, as identified below:
Part 1: "Physical layer";
Part 2: "General description and data link layer";
Part 3: "Additional broadcast aspects";
Part 4: "Point-to-point functions".
The present document is accompanied by an equivalent ground-based standard, ETSI EN 301 842 [i.1] parts 1 to 5,
covering the VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of
measurement for ground-based equipment.
NOTE: Minimum Operational Performance Specifications (MOPS) are also being developed for VDL Mode 4.
EUROCAE have previously published Interim MOPS for VDL Mode 4 [i.2] which are a sub set of
ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and ETSI EN 302 842-4 (the
present document). ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and
ETSI EN 302 842-4 (the present document) comply with the requirements of EC Mandate M/318 [i.3].

National transposition dates
Date of adoption of this EN: 6 April 2015
Date of latest announcement of this EN (doa): 31 July 2015
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2016
Date of withdrawal of any conflicting National Standard (dow): 31 January 2017

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

---------------------- Page: 6 ----------------------
7 ETSI EN 302 842-4 V1.3.1 (2015-04)
Introduction
The present document states the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4
aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air 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
VDL SARPs [2].
The present document may be used to produce tests for the assessment of the performance of the equipment. The
performance of the equipment submitted for type testing should be representative of the performance of the
corresponding production model.
The present document has been written on the assumption that:
• the type test measurements will be performed only once, in an accredited test laboratory and the measurements
accepted by the various authorities in order to grant type approval;
• if equipment available on the market is required to be checked it will be tested in accordance with the methods
of measurement specified in the present document or a documented alternative approved by the certifying
authority;
• equipment comply with ETSI EN 302 842-1 [5] and ETSI EN 302 842-2 [6].
NOTE: The present document has been produced with a view to maintaining consistency of numbering with the
equivalent standard for ground equipment (ETSI EN 301 842 [i.1]). Where requirements are the same,
they have been given the same number. Some new airborne requirements have been inserted between
requirements that were sequential in ETSI EN 301 842 [i.1]. This has led to a non-standard form of
numbering for new requirements in some places.
ETSI

---------------------- Page: 7 ----------------------
8 ETSI EN 302 842-4 V1.3.1 (2015-04)
1 Scope
The present document applies to the following radio equipment types:
• Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters,
transceivers and receivers for air-ground and air-air 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 VDL
SARPs [2].
The present document provides part 4 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 [2] and ICAO VDL4 Technical Manual [1].
Manufacturers should note that in future the tuning range for the transmitter and receiver may also cover any 25 kHz
channel from 108,000 MHz to 111,975 MHz.
The present document applies to "aeronautical mobile (airborne and as applicable also ground vehicles)" equipment
which will hereinafter be referred to as "mobile" equipment.
The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is
ETSI EN 301 842 [i.1].
A description of the scope of the VDL Mode 4 system is provided in part 2 of ETSI EN 302 842-2 [6], clause 1.
ETSI EN 302 842-1 [5] deals with tests of the physical layer, ETSI EN 302 842-2 [6] deals with core link layer
functionality and ETSI EN 302 842-3 [7] with additional broadcast functionality. The present document deals with tests
of the datalink layer (DLS) and the link layer sufficient to support point-to-point functionality. Note that, as described in
ETSI EN 302 842-2 [6], a system supporting point-to-point functionality is required to conform to ETSI
EN 302 842-1 [5], ETSI EN 302 842-2 [6] and the specification in the present document.
The present document is organized as follows:
• clause 2 provides references to relevant documents;
• clause 3 provides general definitions, abbreviations and symbols used;
• clause 4 describes the VDL Mode 4 mobile station point-to-point functions;
• clause 5 provides performance specifications for the VDL Mode 4 mobile station;
• clause 6 provides general design requirements;
• clause 7 provides protocol tests for the point-to-point functions of the system;
• annex A provides a detailed cross-reference to the relev
...

Draft ETSI EN 302 842-4 V1.3.0 (2014-12)






EUROPEAN STANDARD
VHF air-ground and air-air Digital Link (VDL) Mode 4 radio
equipment;
Technical characteristics and methods of measurement for
aeronautical mobile (airborne) equipment;
Part 4: Point-to-point functions

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)



Reference
REN/AERO-00019-4
Keywords
aeronautical, digital, radio, testing, VHF
ETSI
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The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2014.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 7
1 Scope . 8
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definitions and abbreviations . 10
3.1 Definitions . 10
3.1.1 Basic reference model definitions . 10
3.1.2 Service conventions definitions . 10
3.1.3 General definitio ns . 10
3.1.4 Definition of bit order . 10
3.2 Abbreviations . 11
4 General description of VDL Mode 4 mobile station point-to-point services . 12
4.1 General . 12
4.2 Data Link Service (DLS) and Link Management Entity (LME) . 12
4.2.1 General . 12
4.2.2 DLS timers . 15
4.2.3 DLS counters . 16
4.2.4 Toggle bit (T) . 16
4.2.5 State variables (T and T ) . 16
t r
4.2.6 Initialize Bit (IB) . 16
4.2.7 More bit (M) . 17
4.2.8 Priority (pr) . 17
4.2.9 Message fragmentation and concatenation . 17
4.2.10 DLS procedures . 17
4.2.10.1 Selection of DLS procedures. 17
4.2.10.2 Short transmission procedures . 17
4.2.10.3 Long transmission procedures . 18
4.2.11 Linking transmissions . 20
4.2.11.1 Types of linking . 20
4.2.11.2 Combined RTS / DATA DLPDUs . 20
4.2.11.3 Combined DATA / ACK DLPDUs . 20
4.2.11.4 Combined RTS / ACK DLPDUs . 20
4.2.11.5 Combined CTS / ACK DLPDUs . 20
4.2.12 Ground-air link management . 20
4.2.13 Air-air link management . 21
4.3 Additional VSS services . 21
5 Minimum performance specification under standard test conditions . 21
5.1 DLS sublayer . 21
5.1.1 General . 21
5.1.1.1 Services . 21
5.1.1.2 Data transfer . 22
5.1.1.3 DATA DLPDU duplicate suppression and sequencing . 22
5.1.1.4 Error detection . 22
5.1.1.5 Station identification . 22
5.1.1.6 Broadcast addressing . 22
5.1.1.7 DLS Priority . 23
5.1.1.8 DLS Link control DLPDUs . 23
5.1.2 DLS protocol specification . 23
ETSI

---------------------- Page: 3 ----------------------
4 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
5.1.2.1 State variables . 23
5.1.2.2 DLS burst formats . 23
5.1.3 DLS system parameters . 27
5.1.4 DLS procedures . 29
5.1.4.1 Setting of re-transmission parameter . 29
5.1.4.2 Selection of user data packet for transmission . 29
5.1.4.3 Selection of transmission procedures . 31
5.1.4.4 Short transmission procedures . 32
5.1.4.5 Long transmission procedures . 33
5.1.4.6 No link with sender . 35
5.1.4.7 User data packet reception . 36
5.1.4.8 Receipt of ACK DLPDU . 36
5.1.4.9 Link reset . 37
5.1.4.10 Linking DLS DLPDU transmissions . 38
5.1.4.11 CTRL DLPDU . 39
5.1.4.12 Procedures for air-air communication . 39
5.2 Link management entity sublayer. 39
5.2.1 Services . 39
5.2.1.1 General . 39
5.2.1.2 Link provision . 40
5.2.1.3 Link change notifications . 40
5.2.1.4 CTRL DLPDU . 40
5.2.1.5 Broadcast link management burst . 41
5.2.2 Control (CTRL) parameter formats . 41
5.2.2.1 Encoding . 41
5.2.2.2 General purpose information parameters . 41
5.2.2.3 Mobile-initiated information parameters . 45
5.2.2.4 Ground-initiated modification parameters . 46
5.2.2.5 Ground-initiated information parameters . 49
5.2.3 LME timers and parameters . 51
5.2.3.1 General . 51
5.2.3.2 Timer TL1 (maximum link overlap time) . 52
5.2.3.3 Parameters TL2 (link initialization time) . 52
5.2.3.4 Timer TL4 (leave generation latency) . 52
5.2.4 CTRL DLPDU types and procedures . 53
5.2.5 CTRL transmission procedures . 56
5.2.5a Frequency management procedures . 56
5.2.5.1 Link connectivity procedures . 56
5.2.5.2 Ground Station Identification . 56
5.2.5.3 Link establishment . 57
5.2.5.4 Mobile-initiated handoff . 58
5.2.5.5 Mobile-requested ground-initiated handoff . 59
5.2.5.6 Ground-initiated handoff . 59
5.2.5.7 Ground-requested mobile-initiated handoff . 60
5.2.5.8 Ground-requested broadcast handoff . 60
5.2.5.9 Ground-commanded autotune . 61
5.2.6 VDL Mode 4 Mobile SubNetwork Dependent Convergence Function (SNDCF) . 61
5.2.6.1 Frame mode SNDCF . 61
5.3 Additional VSS requirements . 61
5.3.1 Information transfer request protocol specification . 61
5.3.1.1 Information transfer request parameters . 61
5.3.1.2 Information transfer request transmission procedures . 63
5.3.1.3 Information transfer request acknowledgement procedures . 63
5.3.2 Void . 63
5.3.3 Void . 63
5.3.4 Retransmission procedures . 64
6 General design requirements . 64
7 Protocol test procedures . 64
7.1 General . 64
7.2 Required test rig . 64
ETSI

---------------------- Page: 4 ----------------------
5 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
7.3 Protocol test-suite description methodology . 65
7.4 Detailed protocol test procedures . 65
7.4.1 Test-suite overview . 65
7.4.2 Declarations . 68
7.4.3 Constraints . 69
7.4.3.1 Abbreviations . 69
7.4.3.1.1 Subfield mnemonics . 69
7.4.3.1.2 Special characters used in the subfield definitions . 69
7.4.3.1.3 Station addresses and positions . 70
7.4.3.1.4 VDL bursts . 70
7.4.3.2 Test cases . 96
7.4.3.2.1 Test case macros . 97
7.4.3.2.2 Test case descriptions . 99
Annex A (informative): Cross reference matrix . 173
History . 186

ETSI

---------------------- Page: 5 ----------------------
6 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
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://ipr.etsi.org).
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 draft European Standard (EN) has been produced by ETSI Technical Committee Aeronautics (AERO), and is now
submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN Approval Procedure.
The present document is part 4 of a multi-part deliverable covering the VHF air-ground and air-air Digital Link (VDL)
Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne)
equipment, as identified below:
Part 1: "Physical layer";
Part 2: "General description and data link layer";
Part 3: "Additional broadcast aspects";
Part 4: "Point-to-point functions".
The present document is accompanied by an equivalent ground-based standard, ETSI EN 301 842 [i.1] parts 1 to 5,
covering the VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of
measurement for ground-based equipment.
NOTE: Minimum Operational Performance Specifications (MOPS) are also being developed for VDL Mode 4.
EUROCAE have previously published Interim MOPS for VDL Mode 4 [i.2] which are a sub set of
ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and ETSI EN 302 842-4 (the
present document). ETSI EN 302 842-1 [5], ETSI EN 302 842-2 [6], ETSI EN 302 842-3 [7] and
ETSI EN 302 842-4 (the present document) comply with the requirements of EC Mandate M/318 [i.3].

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

---------------------- Page: 6 ----------------------
7 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
Introduction
The present document states the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4
aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air 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
VDL SARPs [2].
The present document may be used to produce tests for the assessment of the performance of the equipment. The
performance of the equipment submitted for type testing should be representative of the performance of the
corresponding production model.
The present document has been written on the assumption that:
• the type test measurements will be performed only once, in an accredited test laboratory and the measurements
accepted by the various authorities in order to grant type approval;
• if equipment available on the market is required to be checked it will be tested in accordance with the methods
of measurement specified in the present document or a documented alternative approved by the certifying
authority;
• equipment comply with ETSI EN 302 842-1 [5] and ETSI EN 302 842-2 [6].
NOTE: The present document has been produced with a view to maintaining consistency of numbering with the
equivalent standard for ground equipment (ETSI EN 301 842 [i.1]). Where requirements are the same,
they have been given the same number. Some new airborne requirements have been inserted between
requirements that were sequential in ETSI EN 301 842 [i.1]. This has led to a non-standard form of
numbering for new requirements in some places.
ETSI

---------------------- Page: 7 ----------------------
8 Draft ETSI EN 302 842-4 V1.3.0 (2014-12)
1 Scope
The present document applies to the following radio equipment types:
• Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters,
transceivers and receivers for air-ground and air-air 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 VDL
SARPs [2].
The present document provides part 4 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 [2] and ICAO VDL4 Technical Manual [1].
Manufacturers should note that in future the tuning range for the transmitter and receiver may also cover any 25 kHz
channel from 108,000 MHz to 111,975 MHz.
The present document applies to "aeronautical mobile (airborne and as applicable also ground vehicles)" equipment
which will hereinafter be referred to as "mobile" equipment.
The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is
ETSI EN 301 842 [i.1].
A description of the scope of the VDL Mode 4 system is provided in part 2 of ETSI EN 302 842-2 [6], clause 1.
ETSI EN 302 842-1 [5] deals with tests of the physical layer, ETSI EN 302 842-2 [6] deals with core link layer
functionality and ETSI EN 302 842-3 [7] with additional broadcast functionality. The present document deals with tests
of the datalink layer (DLS) and the link layer sufficient to support point-to-point functionality. Note that, as described in
ETSI EN 302 842-2 [6], a system supporting point-to-point functionality is required to conform to ETSI
EN 302 842-1 [5], ETSI EN 302 842-2 [6] and the specification in the present document.
The present document is organized as follows:
• clause 2 provides references to relevant documents;
• clause 3 provides general definitions, abbreviations and symbols used;
• clause 4 describes the VDL Mode 4 mobile station point-to-point functions;
• clause 5 provides performance specifications for the VDL Mode 4 mobile station;
• clause 6 provides general design requirements;
• c
...