VHF air-ground Digital Link (VDL) Mode 2;Technical characteristics and methods of measurement for ground-based equipment;Part 1: Physical layer and MAC sub-layer

The present document applies to VDL Mode 2 ground-air digital communications using Differential Eight Phase Shift
Keying (D8PSK), intended for channel increments of 25 kHz. The VDL Mode 2 system provides data communication
exchanges between aircraft and ground-based systems. The scope of the present document is limited to ground-based
stations.
The present document provides functional specifications for ground-based radio equipment intended to be used for
ground-air data communications. The present document is derived from the following documents:
• Annex 10 of the ICAO Convention on International Civil Aviation [1].
• ED 92B [i.2]: "MOPS for an Airborne VDL Mode-2 Transceiver Operating in the frequency range
118-136.975 MHz" (2012), which specifies the airborne transceiver.
The present document consists of two parts:
• the first part provides functional specifications and test procedures for physical layer and MAC sub-layer;
• the second part provides functional specifications and test procedures for link and sub-network access layers.

Radijska oprema za digitalno povezavo VHF zrak-tla, 2. način - Tehnične karakteristike in merilne metode za talno opremo - 1. del: Fizična plast in podplast MAC

Ta dokument se uporablja za radijsko opremo za digitalno povezavo tla-zrak (VDL), 2. način, digitalnih komunikacij, ki uporabljajo diferencialno osemfazno premično šifriranje (D8PSK), namenjeno za kanalne priraste 25 kHz. Sistem VDL, 2. način, omogoča izmenjavo podatkovne komunikacije med letalskimi plovili in talnimi sistemi. Področje uporabe tega dokumenta je omejeno na zemeljske postaje.
Ta dokument določa funkcionalne specifikacije za talno radijsko opremo, namenjeno uporabi za podatkovne komunikacije tla-zrak. Ta dokument izhaja iz naslednjih dokumentov:
• Priloga 10 h Konvenciji o mednarodnem civilnem letalstvu organizacije ICAO[1];
• ED 92B [i.2]: »MOPS za VDL, 2. način, letalski oddajnik-sprejemnik, ki deluje v frekvenčnem razponu
118-136.975 MHz« (2012), ki določa letalski oddajnik-sprejemnik.
Ta dokument sestavljata dva dela:
• prvi del zagotavlja funkcionalne specifikacije in preskusne postopke za fizično plast in podplast MAC;
• drugi del zagotavlja funkcionalne specifikacije in preskusne postopke za plasti za povezavo in podomrežni dostop.

General Information

Status
Published
Public Enquiry End Date
30-Mar-2015
Publication Date
07-Sep-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
02-Jun-2015
Due Date
07-Aug-2015
Completion Date
08-Sep-2015

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ETSI EN 301 841-1 V1.4.1 (2015-04) - VHF air-ground Digital Link (VDL) Mode 2; Technical characteristics and methods of measurement for ground-based equipment; Part 1: Physical layer and MAC sub-layer
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.KQLþQH0$&VHF air-ground Digital Link (VDL) Mode 2;Technical characteristics and methods of measurement for ground-based equipment;Part 1: Physical layer and MAC sub-layer35.100.10Physical layer33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 301 841-1 V1.4.1SIST EN 301 841-1 V1.4.1:2015en,fr,de01-oktober-2015SIST EN 301 841-1 V1.4.1:2015SLOVENSKI
STANDARD



SIST EN 301 841-1 V1.4.1:2015



ETSI EN 301 841-1 V1.4.1 (2015-04) VHF air-ground Digital Link (VDL) Mode 2; Technical characteristics and methods of measurement for ground-based equipment; Part 1: Physical layer and MAC sub-layer
EUROPEAN STANDARD SIST EN 301 841-1 V1.4.1:2015



ETSI ETSI EN 301 841-1 V1.4.1 (2015-04) 2
Reference REN/AERO-00010 Keywords aeronautical, radio, testing, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
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 301 841-1 V1.4.1:2015



ETSI ETSI EN 301 841-1 V1.4.1 (2015-04) 3 Contents Intellectual Property Rights . 6 Foreword . 6 Modal verbs terminology . 6 Introduction . 6 1 Scope . 7 2 References . 7 2.1 Normative references . 7 2.2 Informative references . 7 3 Definitions and abbreviations . 8 3.1 Definitions . 8 3.1.1 Basic reference model definitions . 8 3.1.2 Service conventions definitions . 8 3.1.3 General definitions . 9 3.2 Abbreviations . 9 4 General architecture of VDL Mode 2 . 10 5 Physical layer protocols and services functional specifications . 11 5.1 Overview . 11 5.1.1 Functions . 11 5.1.2 Data reception by the receiver . 12 5.1.3 Data transmission . 12 5.2 Transmission procedure . 12 5.3 Modulation scheme . 13 5.4 Training sequence. 13 5.4.1 RF power rise time definition . 13 5.5 Physical layer Service Access Point . 14 5.6 Tuning range and channel increments . 14 6 VDL MODE 2 equipment requirements . 14 6.1 Transmitter requirements . 14 6.1.1 Frequency Tolerance. 14 6.1.2 Manufacturer's declared output power . 14 6.1.3 Adjacent channel power . 15 6.1.3.1 16 kHz channel bandwidth . 15 6.1.3.2 25 kHz channel bandwidth . 15 6.1.4 Conducted Spurious emissions . 16 6.1.5 Cabinet radiation . 16 6.1.6 Modulation rate . 16 6.1.7 Intermodulation attenuation . 16 6.1.8 RF power rise time . 16 6.1.9 RF power release time . 16 6.1.10 Transceiver timing requirements . 17 6.1.10.1 Receiver to transmitter turn-around time . 17 6.1.10.2 Transmitter to receiver turn-around time . 17 6.1.11 Symbol constellation error . 17 6.1.12 Protection of the transmitter. 17 6.1.13 Load VSWR capability . 17 6.2 Receiver requirements . 17 6.2.1 Sensitivity . 17 6.2.2 Co-channel interference . 17 6.2.3 First Adjacent Channel Rejection . 17 6.2.4 Rejection of signals within the VHF Aeronautical band. 18 6.2.5 Rejection of signals outside the VHF Aeronautical band . 18 6.2.6 In-band Intermodulation . 18 6.2.7 Desired signal dynamic range . 19 SIST EN 301 841-1 V1.4.1:2015



ETSI ETSI EN 301 841-1 V1.4.1 (2015-04) 4 6.2.8 Conducted spurious emission . 19 6.2.9 Cabinet radiation . 19 6.2.10 Symbol rate capture range . 19 6.2.11 Frequency capture range . 19 6.3 Void . 19 6.4 MAC sub-layer requirements . 19 6.4.1 MAC services . 19 6.4.1.1 Multiple Access . 19 6.4.1.2 Channel Congestion . 19 6.4.2 MAC System Parameters . 19 6.4.2.1 Timer TM1 (inter-access delay timer). 19 6.4.2.2 Timer TM2 (channel busy timer) . 20 6.4.2.3 Parameter p (persistence) . 20 6.4.2.4 Counter M1 (maximum access attempts) . 20 6.4.3 Description of MAC Layer Procedures . 20 6.4.3.1 Channel Sensing . 20 6.4.3.2 Access Attempt . 20 6.4.3.3 Signal Quality Parameter . 20 6.4.4 Services (Part of DLS) . 20 6.4.4.1 Error Detection . 20 6.4.4.2 Station Identification . 20 7 General requirements . 21 7.1 General . 21 7.2 Controls and indicators . 21 7.3 Class of emission and modulation characteristics . 21 7.4 Warm up . 21 8 Test conditions, power sources and ambient temperatures . 21 8.1 Test power source . 21 8.2 Normal and extreme test conditions . 21 8.2.1 Normal test conditions . 21 8.2.1.1 Normal temperature and humidity . 21 8.2.1.2 Normal power sources . 22 8.2.1.2.1 Mains voltage and frequency . 22 8.2.1.2.2 Other power sources . 22 8.2.2 Extreme test conditions . 22 8.2.2.1 Extreme temperatures . 22 8.2.2.2 Procedure for tests at extreme temperatures . 22 8.2.2.2.1 General . 22 8.2.2.2.2 High temperature . 22 8.2.2.2.3 Low temperature . 22 8.2.2.3 Extreme values of test power sources . 23 8.2.2.4 Other power sources . 23 8.3 Test channels . 23 8.4 General conditions of measurement . 23 8.4.1 Receiver test signal arrangement . 23 8.4.2 Receiver BER test . 23 8.4.3 Performance check . 24 9 Detailed Test Procedures for the physical layer . 25 9.1 Transmitter . 25 9.1.1 Frequency Error . 25 9.1.1.1 Definition . 25 9.1.1.2 Method of measurement . 25 9.1.1.3 Limits . 25 9.1.2 Manufacturer's declared output power . 25 9.1.3 Adjacent channel power . 26 9.1.3.1 Method of measurement for the first adjacent channel . 26 9.1.3.2 Method of measurement for the second adjacent channel . 27 9.1.3.3 Method of measurement for the fourth adjacent channel . 27 9.1.3.4 Wideband noise . 29 9.1.4 Spurious emissions . 30 SIST EN 301 841-1 V1.4.1:2015



ETSI ETSI EN 301 841-1 V1.4.1 (2015-04) 5 9.1.5 Cabinet Radiation . 30 9.1.6 Void . 30 9.1.7 Inter-modulation attenuation . 30 9.1.8 RF power rise time . 31 9.1.9 RF power release time . 33 9.1.10 Physical layer, system parameters . 34 9.1.10.1 Receiver to Transmitter turn-around time . 34 9.1.10.2 Transmitter to Receiver turn-around time . 35 9.1.11 Symbol Constellation Error . 36 9.1.12 Protection of the transmitter. 37 9.1.12.1 Method of measurement . 37 9.1.12.2 Requirement . 37 9.1.13 Load VSWR capability . 37 9.2 Receiver . 38 9.2.1 Sensitivity . 38 9.2.2 Co-channel interference . 38 9.2.3 First Adjacent Channel Rejection . 39 9.2.4 Rejection of signals within the VHF Aeronautical band. 40 9.2.5 Rejection of signals outside the VHF Aeronautical band . 41 9.2.6 In-band Intermodulation . 41 9.2.7 Desired Signal dynamic range . 42 9.2.8 Conducted spurious emission . 43 9.2.9 Cabinet Radiation . 43 9.2.10 Symbol rate capture range . 43 9.2.11 Frequency capture range . 44 9.3 Void . 44 9.4 MAC sub-layer . 44 9.4.1 MAC services . 45 9.4.1.1 Multiple Access . 45 9.4.1.2 Channel Congestion . 45 9.4.2 MAC System Parameters . 45 9.4.2.1 Timer TM1 (inter-access delay timer). 45 9.4.2.2 Timer TM2 (channel busy timer) . 46 9.4.2.3 Parameter p (persistence) . 46 9.4.2.4 Counter M1 (maximum access attempts) . 47 9.4.3 Description of MAC Layer Procedures . 48 9.4.3.1 Channel Sensing . 48 9.4.3.2 Access Attempt . 48 9.4.3.3 Signal Quality Parameter . 49 9.4.4 Services (Part of DLS) . 49 9.4.4.1 Error Detection . 49 9.4.4.2 Station Identification . 50 Annex A (informative): Bibliography . 51 History . 52
SIST EN 301 841-1 V1.4.1:2015



ETSI ETSI EN 301 841-1 V1.4.1 (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 1 of a multi-part deliverable covering VHF air-ground Digital Link (VDL) Mode 2; Technical characteristics and methods of measurement for ground-based equipment, as identified below: Part 1: "Physical layer and MAC sub-layer"; Part 2: "Upper layers"; Part 3: "Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive".
National transposition dates Date of adoption of this EN: 21 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 2016
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. Introduction The present doc
...

ETSI EN 301 841-1 V1.4.1 (2015-04)






EUROPEAN STANDARD
VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and
methods of measurement
for ground-based equipment;
Part 1: Physical layer and MAC sub-layer

---------------------- Page: 1 ----------------------
2 ETSI EN 301 841-1 V1.4.1 (2015-04)



Reference
REN/AERO-00010
Keywords
aeronautical, radio, testing, VHF
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

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 301 841-1 V1.4.1 (2015-04)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.1.1 Basic reference model definitions . 8
3.1.2 Service conventions definitions . 8
3.1.3 General definitio ns . 9
3.2 Abbreviations . 9
4 General architecture of VDL Mode 2 . 10
5 Physical layer protocols and services functional specifications . 11
5.1 Overview . 11
5.1.1 Functions . 11
5.1.2 Data reception by the receiver . 12
5.1.3 Data transmission . 12
5.2 Transmission procedure . 12
5.3 Modulation scheme . 13
5.4 Training sequence. 13
5.4.1 RF power rise time definition . 13
5.5 Physical layer Service Access Point . 14
5.6 Tuning range and channel increments . 14
6 VDL MODE 2 equipment requirements . 14
6.1 Transmitter requirements . 14
6.1.1 Frequency Tolerance. 14
6.1.2 Manufacturer's declared output power . 14
6.1.3 Adjacent channel power . 15
6.1.3.1 16 kHz channel bandwidth . 15
6.1.3.2 25 kHz channel bandwidth . 15
6.1.4 Conducted Spurious emissions . 16
6.1.5 Cabinet radiation . 16
6.1.6 Modulation rate . 16
6.1.7 Intermodulation attenuation . 16
6.1.8 RF power rise time . 16
6.1.9 RF power release time . 16
6.1.10 Transceiver timing requirements . 17
6.1.10.1 Receiver to transmitter turn-around time . 17
6.1.10.2 Transmitter to receiver turn-around time . 17
6.1.11 Symbol constellation error . 17
6.1.12 Protection of the transmitter. 17
6.1.13 Load VSWR capability . 17
6.2 Receiver requirements . 17
6.2.1 Sensitivity . 17
6.2.2 Co-channel interference . 17
6.2.3 First Adjacent Channel Rejection . 17
6.2.4 Rejection of signals within the VHF Aeronautical band. 18
6.2.5 Rejection of signals outside the VHF Aeronautical band . 18
6.2.6 In-band Intermodulation . 18
6.2.7 Desired signal dynamic range . 19
ETSI

---------------------- Page: 3 ----------------------
4 ETSI EN 301 841-1 V1.4.1 (2015-04)
6.2.8 Conducted spurious emission . 19
6.2.9 Cabinet radiation . 19
6.2.10 Symbol rate capture range . 19
6.2.11 Frequency capture range . 19
6.3 Void . 19
6.4 MAC sub-layer requirements . 19
6.4.1 MAC services . 19
6.4.1.1 Multiple Access . 19
6.4.1.2 Channel Congestion . 19
6.4.2 MAC System Parameters . 19
6.4.2.1 Timer TM1 (inter-access delay timer). 19
6.4.2.2 Timer TM2 (channel busy timer) . 20
6.4.2.3 Parameter p (persistence) . 20
6.4.2.4 Counter M1 (maximum access attempts) . 20
6.4.3 Description of MAC Layer Procedures . 20
6.4.3.1 Channel Sensing . 20
6.4.3.2 Access Attempt . 20
6.4.3.3 Signal Quality Parameter . 20
6.4.4 Services (Part of DLS) . 20
6.4.4.1 Error Detection . 20
6.4.4.2 Station Identification . 20
7 General requirements . 21
7.1 General . 21
7.2 Controls and indicators . 21
7.3 Class of emission and modulation characteristics . 21
7.4 Warm up . 21
8 Test conditions, power sources and ambient temperatures . 21
8.1 Test power source . 21
8.2 Normal and extreme test conditions . 21
8.2.1 Normal test conditions . 21
8.2.1.1 Normal temperature and humidity . 21
8.2.1.2 Normal power sources . 22
8.2.1.2.1 Mains voltage and frequency . 22
8.2.1.2.2 Other power sources . 22
8.2.2 Extreme test conditions . 22
8.2.2.1 Extreme temperatures . 22
8.2.2.2 Procedure for tests at extreme temperatures . 22
8.2.2.2.1 General . 22
8.2.2.2.2 High temperature . 22
8.2.2.2.3 Low temperature . 22
8.2.2.3 Extreme values of test power sources . 23
8.2.2.4 Other power sources . 23
8.3 Test channels . 23
8.4 General conditions of measurement . 23
8.4.1 Receiver test signal arrangement . 23
8.4.2 Receiver BER test . 23
8.4.3 Performance check . 24
9 Detailed Test Procedures for the physical layer . 25
9.1 Transmitter . 25
9.1.1 Frequency Error . 25
9.1.1.1 Definition . 25
9.1.1.2 Method of measurement . 25
9.1.1.3 Limits . 25
9.1.2 Manufacturer's declared output power . 25
9.1.3 Adjacent channel power . 26
9.1.3.1 Method of measurement for the first adjacent channel . 26
9.1.3.2 Method of measurement for the second adjacent channel . 27
9.1.3.3 Method of measurement for the fourth adjacent channel . 27
9.1.3.4 Wideband noise . 29
9.1.4 Spurious emissions . 30
ETSI

---------------------- Page: 4 ----------------------
5 ETSI EN 301 841-1 V1.4.1 (2015-04)
9.1.5 Cabinet Radiation . 30
9.1.6 Void . 30
9.1.7 Inter-modulation attenuation . 30
9.1.8 RF power rise time . 31
9.1.9 RF power release time . 33
9.1.10 Physical layer, system parameters . 34
9.1.10.1 Receiver to Transmitter turn-around time . 34
9.1.10.2 Transmitter to Receiver turn-around time . 35
9.1.11 Symbol Constellation Error . 36
9.1.12 Protection of the transmitter. 37
9.1.12.1 Method of measurement . 37
9.1.12.2 Requirement . 37
9.1.13 Load VSWR capability . 37
9.2 Receiver . 38
9.2.1 Sensitivity . 38
9.2.2 Co-channel interference . 38
9.2.3 First Adjacent Channel Rejection . 39
9.2.4 Rejection of signals within the VHF Aeronautical band. 40
9.2.5 Rejection of signals outside the VHF Aeronautical band . 41
9.2.6 In-band Intermodulation . 41
9.2.7 Desired Signal dynamic range . 42
9.2.8 Conducted spurious emission . 43
9.2.9 Cabinet Radiation . 43
9.2.10 Symbol rate capture range . 43
9.2.11 Frequency capture range . 44
9.3 Void . 44
9.4 MAC sub-layer . 44
9.4.1 MAC services . 45
9.4.1.1 Multiple Access . 45
9.4.1.2 Channel Congestion . 45
9.4.2 MAC System Parameters . 45
9.4.2.1 Timer TM1 (inter-access delay timer). 45
9.4.2.2 Timer TM2 (channel busy timer) . 46
9.4.2.3 Parameter p (persistence) . 46
9.4.2.4 Counter M1 (maximum access attempts) . 47
9.4.3 Description of MAC Layer Procedures . 48
9.4.3.1 Channel Sensing . 48
9.4.3.2 Access Attempt . 48
9.4.3.3 Signal Quality Parameter . 49
9.4.4 Services (Part of DLS) . 49
9.4.4.1 Error Detection . 49
9.4.4.2 Station Identification . 50
Annex A (informative): Bibliography . 51
History . 52

ETSI

---------------------- Page: 5 ----------------------
6 ETSI EN 301 841-1 V1.4.1 (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 1 of a multi-part deliverable covering VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and methods of measurement for ground-based equipment, as identified below:
Part 1: "Physical layer and MAC sub-layer";
Part 2: "Upper layers";
Part 3: "Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive".

National transposition dates
Date of adoption of this EN: 21 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 2016

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.
Introduction
The present document states the technical specifications for ground-based equipment implementing Very High
Frequency (VHF) Digital Link (VDL) Mode 2 air interface, operating in the VHF band (117,97
...

Draft ETSI EN 301 841-1 V1.4.0 (2014-12)






EUROPEAN STANDARD
VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and
methods of measurement
for ground-based equipment;
Part 1: Physical layer and MAC sub-layer

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 301 841-1 V1.4.0 (2014-12)



Reference
REN/AERO-00010
Keywords
aeronautical, radio, testing, VHF
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

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
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
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3 Draft ETSI EN 301 841-1 V1.4.0 (2014-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.1.1 Basic reference model definitions . 9
3.1.2 Service conventions definitions . 9
3.1.3 General definitio ns . 10
3.2 Abbreviations . 10
4 General architecture of VDL Mode 2 . 12
5 Physical layer protocols and services functional specifications . 13
5.1 Overview . 13
5.1.1 Functions . 13
5.1.2 Data reception by the receiver . 13
5.1.3 Data transmission . 13
5.2 Transmission procedure . 13
5.3 Modulation scheme . 14
5.4 Training sequence. 15
5.4.1 RF power rise time definition . 15
5.5 Physical layer Service Access Point . 16
5.6 Tuning range and channel increments . 16
6 VDL MODE 2 equipment requirements . 16
6.1 Transmitter requirements . 16
6.1.1 Frequency Tolerance. 16
6.1.2 Manufacturer's declared output power . 16
6.1.3 Adjacent channel power . 17
6.1.3.1 16 kHz channel bandwidth . 17
6.1.3.2 25 kHz channel bandwidth . 17
6.1.4 Conducted Spurious emissions . 18
6.1.5 Cabinet radiation . 18
6.1.6 Modulation rate . 18
6.1.7 Intermodulation attenuation . 18
6.1.8 RF power rise time . 18
6.1.9 RF power release time . 18
6.1.10 Transceiver timing requirements . 19
6.1.10.1 Receiver to transmitter turn-around time . 19
6.1.10.2 Transmitter to receiver turn-around time . 19
6.1.11 Symbol constellation error . 19
6.1.12 Protection of the transmitter. 19
6.1.13 Load VSWR capability . 19
6.2 Receiver requirements . 19
6.2.1 Sensitivity . 19
6.2.2 Co-channel interference . 19
6.2.3 First Adjacent Channel Rejection . 19
6.2.4 Rejection of signals within the VHF Aeronautical band. 20
6.2.5 Rejection of signals outside the VHF Aeronautical band . 20
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4 Draft ETSI EN 301 841-1 V1.4.0 (2014-12)
6.2.6 In-band Intermodulation . 20
6.2.7 Desired signal dynamic range . 21
6.2.8 Conducted spurious emission . 21
6.2.9 Cabinet radiation . 21
6.2.10 Symbol rate capture range . 21
6.2.11 Frequency capture range . 21
6.3 Void . 21
6.4 MAC sub-layer requirements . 21
6.4.1 MAC services . 21
6.4.1.1 Multiple Access . 21
6.4.1.2 Channel Congestion . 22
6.4.2 MAC System Parameters . 22
6.4.2.1 Timer TM1 (inter-access delay timer). 22
6.4.2.2 Timer TM2 (channel busy timer) . 22
6.4.2.3 Parameter p (persistence) . 22
6.4.2.4 Counter M1 (maximum access attempts) . 22
6.4.3 Description of MAC Layer Procedures . 22
6.4.3.1 Channel Sensing . 22
6.4.3.2 Access Attempt . 22
6.4.3.3 Signal Quality Parameter . 22
6.4.4 Services (Part of DLS) . 23
6.4.4.1 Error Detection . 23
6.4.4.2 Station Identification . 23
7 General requirements . 23
7.1 General . 23
7.2 Controls and indicators . 23
7.3 Class of emission and modulation characteristics . 23
7.4 Warm up . 24
8 Test conditions, power sources and ambient temperatures . 24
8.1 Test power source . 24
8.2 Normal and extreme test conditions . 24
8.2.1 Normal test conditions . 24
8.2.1.1 Normal temperature and humidity . 24
8.2.1.2 Normal power sources . 24
8.2.1.2.1 Mains voltage and frequency . 24
8.2.1.2.2 Other power sources . 24
8.2.2 Extreme test conditions . 25
8.2.2.1 Extreme temperatures . 25
8.2.2.2 Procedure for tests at extreme temperatures . 25
8.2.2.2.1 General . 25
8.2.2.2.2 High temperature . 25
8.2.2.2.3 Low temperature . 25
8.2.2.3 Extreme values of test power sources . 26
8.2.2.4 Other power sources . 26
8.3 Test channels . 26
8.4 General conditions of measurement . 26
8.4.1 Receiver test signal arrangement . 26
8.4.2 Receiver BER test . 26
8.4.3 Performance check . 28
9 Detailed Test Procedures for the physical layer . 28
9.1 Transmitter . 28
9.1.1 Frequency Error . 28
9.1.1.1 Definition . 28
9.1.1.2 Method of measurement . 28
9.1.1.3 Limits . 28
9.1.2 Manufacturer's declared output power . 28
9.1.3 Adjacent channel power . 29
9.1.3.1 Method of measurement for the first adjacent channel . 29
9.1.3.2 Method of measurement for the second adjacent channel . 30
9.1.3.3 Method of measurement for the fourth adjacent channel . 30
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5 Draft ETSI EN 301 841-1 V1.4.0 (2014-12)
9.1.3.4 Wideband noise . 32
9.1.4 Spurious emissions . 33
9.1.5 Cabinet Radiation . 33
9.1.6 Void . 33
9.1.7 Inter-modulation attenuation . 33
9.1.8 RF power rise time . 34
9.1.9 RF power release time . 36
9.1.10 Physical layer, system parameters . 37
9.1.10.1 Receiver to Transmitter turn-around time . 37
9.1.10.2 Transmitter to Receiver turn-around time . 38
9.1.11 Symbol Constellation Error . 39
9.1.12 Protection of the transmitter. 40
9.1.12.1 Method of measurement . 40
9.1.12.2 Requirement . 40
9.1.13 Load VSWR capability . 40
9.2 Receiver . 41
9.2.1 Sensitivity . 41
9.2.2 Co-channel interference . 41
9.2.3 First Adjacent Channel Rejection . 42
9.2.4 Rejection of signals within the VHF Aeronautical band. 43
9.2.5 Rejection of signals outside the VHF Aeronautical band . 44
9.2.6 In-band Intermodulation . 44
9.2.7 Desired Signal dynamic range . 45
9.2.8 Conducted spurious emission . 46
9.2.9 Cabinet Radiation . 46
9.2.10 Symbol rate capture range . 46
9.2.11 Frequency capture range . 47
9.3 Void . 47
9.4 MAC sub-layer . 48
9.4.1 MAC services . 48
9.4.1.1 Multiple Access . 48
9.4.1.2 Channel Congestion . 48
9.4.2 MAC System Parameters . 48
9.4.2.1 Timer TM1 (inter-access delay timer). 48
9.4.2.2 Timer TM2 (channel busy timer) . 49
9.4.2.3 Parameter p (persistence) . 50
9.4.2.4 Counter M1 (maximum access attempts) . 51
9.4.3 Description of MAC Layer Procedures . 51
9.4.3.1 Channel Sensing . 51
9.4.3.2 Access Attempt . 52
9.4.3.3 Signal Quality Parameter . 52
9.4.4 Services (Part of DLS) . 53
9.4.4.1 Error Detection . 53
9.4.4.2 Station Identification . 53
Annex A (informative): Bibliography . 54
History . 55

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6 Draft ETSI EN 301 841-1 V1.4.0 (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 1 of a multi-part deliverable covering VHF air-ground Digital Link (VDL) Mode 2;
Technical characteristics and methods of measurement for ground-based equipment, as identified below:
Part 1: "Physical layer and MAC sub-layer";
Part 2: "Upper layers";
Part 3: "Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive".

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): 6 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.
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7 Draft ETSI EN 301 841-
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