Electromagnetic compatibility and Radio spectrum Matters (ERM); Terrestrial Flight Telecommunications System (TFTS); Technical requirements for TFTS

Technical requirements to be provided by terminal equipment of the TFTS capable of, and intended for, connection to a public telecommunication network. TFTS will operate in the frequency band 1670-1675 MHz (ground to air) and 1800-1805 MHz (air to ground). The modulation technique is /4 DQPSK. The system is cellular in nature and the availablespectrum will support up to 164 radio channelswhich may be reused between cells. Each radio channel will support four voice telephone circuits operating with a 9,6 kbit/s voice coding alogorithm. The objective of this TBR is to define the minimum requirements  for conformance testing of TFTS Aircraft Station (AS). This shall include testing of the radio interface in terms of RF parameters and basic interworking tests. The interworking tests include a set of tests over the CTU/AT interface which conform to ARINC 746 Attachment 11 characteristics. For non-ARINC 746 aircraft the TBR includes interworking tests based on the AT plus the terminal equipment configuration. This TBR covers the essential requirements of the TTE Directive 91/263/EEC Articles 4c, 4d, 4e and 4f. Articles 4a and 4b are subject to proof of conformity outside of the scope of this TBR and, therefore, are not covered by this TBR. Telephony for TFTS is not a justified case and therfore, there are no requirements on voice quality in relation to Article 4g of the TTE Directive. Certain aspects of EMC performance are the subject of normal aircraft eqipment certification and are specified in Eurocae ED14C (RTCA-DO160C). The applicable test categories are specified in ARINC Characteristics 752. It should be recognized that TFTS mobile stations are airborne equipment and that they are also subject  to a separate certification process for aircraft.  (DI/RES-05-01/4 (I-ETS 300  ...) constitutes the full conformance tests for TFTS. The set of requirements in I-ETS 300  and this TBR are not necessarily identical.

Elektromagnetna združljivost (EMC) in zadeve v zvezi z radijskim spektrom (ERM) - Prizemni letalski telekomunikacijski sistem (TFTS) - Tehnične zahteve za TFTS

General Information

Status
Published
Publication Date
31-Aug-2002
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Sep-2002
Due Date
01-Sep-2002
Completion Date
01-Sep-2002
Mandate

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SLOVENSKI STANDARD
SIST TBR 023:2002
01-september-2002

(OHNWURPDJQHWQD]GUXåOMLYRVW (0& LQ]DGHYHY]YH]L]UDGLMVNLPVSHNWURP (50 

3UL]HPQLOHWDOVNLWHOHNRPXQLNDFLMVNLVLVWHP 7)76 7HKQLþQH]DKWHYH]D7)76

Electromagnetic compatibility and Radio spectrum Matters (ERM); Terrestrial Flight

Telecommunications System (TFTS); Technical requirements for TFTS
Ta slovenski standard je istoveten z: TBR 023 Edition 1
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
49.090 2SUHPDLQLQVWUXPHQWLY On-board equipment and
]UDþQLKLQYHVROMVNLKSORYLOLK instruments
SIST TBR 023:2002 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST TBR 023:2002
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SIST TBR 023:2002
TECHNICAL TBR 23
BASIS for March 1998
REGULATION
Source: ERM Reference: DTBR/ERM-RP05-002
ICS: 33.020
Key words: Radio, terminal, testing, TFTS, type approval
Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Terrestrial Flight Telecommunications System (TFTS);
Technical requirements for TFTS
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16

Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the

foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1998. All rights reserved.
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SIST TBR 023:2002
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TBR 23: March 1998

Whilst every care has been taken in the preparation and publication of this document, errors in content,

typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to

"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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SIST TBR 023:2002
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TBR 23: March 1998
Contents

Foreword .......................................................................................................................................................5

Introduction....................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 Normative references..........................................................................................................................7

3 Definitions, symbols and abbreviations...............................................................................................8

3.1 Definitions ............................................................................................................................8

3.2 Symbols ...............................................................................................................................8

3.3 Abbreviations .......................................................................................................................8

4 Requirements......................................................................................................................................8

4.1 Transmitter power output.....................................................................................................9

4.1.1 Requirement....................................................................................................9

4.1.2 Justification for requirement ............................................................................9

4.2 Transmitter frequency accuracy ..........................................................................................9

4.2.1 Requirement....................................................................................................9

4.2.2 Justification for requirement ............................................................................9

4.3 RF spectrum mask ..............................................................................................................9

4.3.1 Requirement....................................................................................................9

4.3.2 Justification for requirement ..........................................................................10

4.4 Out of band and spurious emissions .................................................................................10

4.4.1 Requirement..................................................................................................10

4.4.1.1 Out of band emissions.........................................................10

4.4.1.2 Spurious emissions .............................................................10

4.4.2 Justification for requirement ..........................................................................10

4.5 Correct decoding of Broadcast Control CHannel (BCCH).................................................11

4.5.1 Requirement..................................................................................................11

4.5.2 Justification....................................................................................................11

4.6 Correct response to shutdown command from the GS .....................................................11

4.6.1 Requirement..................................................................................................11

4.6.2 Justification....................................................................................................11

4.7 AT response to timing and power adjustment commands ................................................11

4.7.1 Requirement..................................................................................................11

4.7.2 Justification....................................................................................................11

5 The TBR test specification ................................................................................................................11

5.1 Transmitter power output...................................................................................................12

5.1.1 Test method ..................................................................................................12

5.1.2 Test bank characteristics ..............................................................................12

5.1.3 Measurement uncertainty..............................................................................12

5.2 Transmitter frequency accuracy ........................................................................................13

5.2.1 Test method ..................................................................................................13

5.2.2 Test bank characteristics ..............................................................................13

5.2.3 Measurement uncertainty..............................................................................13

5.3 RF spectrum mask ............................................................................................................13

5.3.1 Test method ..................................................................................................13

5.3.2 Test bank characteristics ..............................................................................13

5.3.3 Measurement uncertainty..............................................................................13

5.4 Out of band and spurious emissions .................................................................................14

5.4.1 Test method ..................................................................................................14

5.4.1.1 Out of band emissions.........................................................14

5.4.1.2 Spurious emissions .............................................................14

5.4.2 Test bank characteristics ..............................................................................14

5.4.3 Measurement uncertainty..............................................................................15

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TBR 23: March 1998

5.5 Correct decoding of BCCH channel .................................................................................. 15

5.5.1 Test method.................................................................................................. 15

5.5.2 Test bank characteristics.............................................................................. 15

5.5.3 Measurement uncertainty ............................................................................. 15

5.6 Correct response to shutdown command ......................................................................... 15

5.6.1 Test method.................................................................................................. 15

5.6.2 Measurement uncertainty ............................................................................. 15

5.6.3 Measurement uncertainty ............................................................................. 15

5.7 AT response to timing and power adjustment commands................................................ 16

5.7.1 Test method.................................................................................................. 16

5.7.1.1 Timing ................................................................................. 16

5.7.1.2 Power.................................................................................. 16

5.7.2 Test bank characteristics.............................................................................. 16

5.7.3 Measurement uncertainty ............................................................................. 16

6 Test conditions and facilities............................................................................................................. 16

6.1 Environmental conditions for tests .................................................................................... 16

6.2 Power supply requirements............................................................................................... 16

6.3 Uncertainty in measurements ........................................................................................... 16

6.4 Measurements made under continuous or burst modulation............................................ 16

6.5 Test apparatus .................................................................................................................. 17

6.6 AT testing facilities ............................................................................................................ 17

6.6.1 Direct control of AT....................................................................................... 17

6.6.2 Loopback facility ........................................................................................... 17

6.6.3 Continuous modulation mode....................................................................... 18

6.6.3.1 Test signals......................................................................... 18

6.6.4 Suppressed modulation mode...................................................................... 18

6.6.5 Standby mode............................................................................................... 18

6.7 Access to signals .............................................................................................................. 18

Annex A (normative): TBR Requirements Table (TBR-RT) ................................................................. 20

History......................................................................................................................................................... 21

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TBR 23: March 1998
Foreword

This Technical Basis for Regulation (TBR) has been produced by the Electromagnetic compatibility and

Radio spectrum Matters (ERM) Technical Committee of the European Telecommunications Standards

Institute (ETSI).

The present document has been produced by ETSI in response to a mandate from the European

Commission issued under Council Directive 83/189/EEC (as amended) laying down a procedure for the

provision of information in the field of technical standards and regulations.

The present document is intended to become a Harmonized Standard, the reference of which will be

published in the Official Journal of the European Communities referencing the Council Directive Directive

91/263/EEC on the approximation of the laws of the Member States concerning telecommunications

terminal equipment, including the mutual recognition of their conformity ("the TTE Directive").

Technical specifications relevant to the TTE Directive are given in Annex A.
Introduction

This TBR provides the essential requirements of Article 4e (effective use of the radio frequency spectrum)

of Council Directive 91/263/EEC on the approximation of the laws of the Member States concerning

telecommunications Terminal Equipment, including the mutual recognition of their conformity for the

Terrestrial Flights Telecommunications System (TFTS) Avionic Termination (AT), Article 4d (protection of

the public telecommunications network from harm) has been considered for the TFTS ground station only

as it has been determined that the AT cannot harm to the public telecommunications network.

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TBR 23: March 1998
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TBR 23: March 1998
1 Scope

This Technical Basis for Regulation (TBR) specifies the technical requirements to be provided by terminal

equipment of the Terrestrial Flight Telecommunications System (TFTS) capable of, and intended for,

connection to a public telecommunication network. The TFTS operates in the frequency spectrum

1 670 MHz to 1 675 MHz (ground to-air) and 1 800 MHz to 1 805 MHz (air to ground). The modulation

technique is p/4 DQPSK. The system is cellular in nature and the available spectrum supports up to 164

radio channels which may be reused between cells. Each radio channel supports four voice telephone

circuits with a 9,6 kbit/s voice coding algorithm. TFTS mobile stations are airborne equipment and they are

also subject to a separate certification process for aircraft.

The objective of this TBR is to define the minimum requirements for conformance testing of the TFTS

Avionic Termination (AT). This includes testing of the radio interface in terms of Radio Frequency (RF)

parameters.

This TBR covers the essential requirements of the Terminal Directive 91/263/EEC [6] Articles 4d and 4e.

This TBR does not include any interworking requirements under Article 4f.

Council Directive 91/263/EEC [6] Articles 4a and 4b [6] are subject to proof of conformity outside of the

scope of this TBR and, therefore, are not covered by this TBR.

Telephony for TFTS is not a justified case and therefore there are no requirements on voice quality in

relation to Article 4g of Directive 91/263/EEC [6].

There are no technical requirements which are specific to the equipment in terms of Article 4c of Directive

91/263/EEC [6]. Other technical aspects of Electromagnetic compatibility and (EMC) performance are the

subject of normal aircraft equipment certification and are specified in EUROCAE ED-14C [4]

(RTCA-DO160C). The applicable test categories are specified in ARINC Characteristic 752 [3].

EN 300 789 [5] constitutes the conformance specification for the radio characteristics of the AT. The set of

requirements in EN 300 789 [9] and the set of requirements in this TBR are not necessarily identical.

2 Normative references

This TBR incorporates by dated and undated reference, provisions from other publications. These

normative references are cited at the appropriate places in the text and the publications are listed

hereafter. For dated references, subsequent amendments to or revisions of any of these publications

apply to this TBR only when incorporated in it by amendment or revision. For undated references the

latest edition of the publication referred to applies.
[1] ETS 300 326-2 (1996): "Radio Equipment and Systems (RES); Terrestrial Flight
Telephone System (TFTS); Part 2: Speech services, radio interface".
[2] ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the
measurement of mobile radio equipment characteristics".

[3] ARINC Characteristic 752 (January 1993): "Terrestrial Flight Telephone System

(TFTS) Airborne Radio Subsystem".
[4] EUROCAE ED-14C: "Environmental Conditions and Test Procedures for
Airborne Equipment".
[5] EN 300 789 (1997): "Radio Equipment and Systems (RES); Terrestrial Flight
Telecommunications System (TFTS); Avionic Termination Radio Testing
Specification".

[6] Council directive of 29 April 1991 on the approximation of the laws of Member

States concerning telecommunications terminal equipment, including the mutual
recognition of their conformity (91/263/EEC) ("The TTE Directive").
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3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this TBR, the following definitions apply:

out-of-band emission: Emission on a frequency or frequencies immediately outside the necessary

bandwidth which results from the modulation process, but excluding spurious emissions.

spurious emission: Emission on a frequency or frequencies which are outside the necessary bandwidth

and the level of which may be reduced without affecting the corresponding transmission of information.

Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and

frequency conversion products, but exclude out-of-band emissions.
unwanted emissions: Consist of spurious emissions and out-of-band emissions.

necessary bandwidth: For a given class of emission, the width of the frequency band which is just

sufficient to ensure the transmission of information at the rate and with the quality required under specified

conditions.

occupied bandwidth: The width of a frequency band such that, below the lower and above the upper

frequency limits, the mean powers emitted are each equal to a specified percentage P/2 of the total mean

power of a given emission.

95 % confidence level: 1,96 times the total standard deviation, based on the Student t factor.

continuous modulation mode: See subclause 6.6.3.
suppressed modulation mode: See subclause 6.6.4.
burst mode: Transmission with one or more of the traffic.channels unused.
3.2 Symbols
For the purposes of this TBR, the following symbols apply:
ppm parts per million
p/4 DQPSKp/4 Differential Quaternary Phase Shift Keying
3.3 Abbreviations
For the purposes of this TBR, the following abbreviations apply:
AT Avionic Termination
BCCH Broadcast Control CHannel
BER Bit Error Ratio
EMC ElectroMagnetic Compatibility
GS Ground Station (of the TFTS system)
PRBS Pseudo Random Bit Sequence
RF Radio Frequency
TFTS Terrestrial Flight Telecommunications System
WOW Weight On Wheels
4 Requirements

This TBR covers the essential requirements of the TTE Directive [6] Articles 4d and 4e.

For guidance, Article 4d refers to the protection of the public telecommunications network from harm,

Article 4e refers to the effective use of the radio frequency spectrum.
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TBR 23: March 1998

EN 300 789 [5] provides methods for the radio tests of conformance of the Avionic Termination (AT) to

ETS 300 326-2 [1] but contains no tests for the essential requirements of Article 4d of the

TTE Directive [6].
4.1 Transmitter power output
4.1.1 Requirement
ETS 300 326-2 [1] subclauses 8.8.2.2.1 and 8.8.2.5.

The nominal mean transmit power shall be +40 dBm (+2, -1 dB) at the antenna port. The lowest value of

the mean transmit power shall be 75 – 2 dB below nominal. The automatic power control shall adjust the

output power relative to the nominal mean level in the range +0 to -75 dB in equal steps of 5 dB. The

tolerance of each step shall be –2 dB.
When Weight On Wheels (WOW) is TRUE, the mean power level shall be reduced to
+25 (+4, -3 dB) dBm, also measured at the antenna port.
4.1.2 Justification for requirement
Effective use of the RF spectrum.

The purpose of the test is to verify that the AT output powers both with and without automatic power

control action are within the ranges specified in subclause 4.1.1 when measured at the antenna port. This

ensures that the AT will not cause interference to other ground stations in the TFTS network by

transmitting at too high a power level.
4.2 Transmitter frequency accuracy
4.2.1 Requirement
ETS 300 326-2 [1] subclause 8.8.1.3.1.

The fractional error between the actual transmitted frequency or the centre frequency of the receiver and

the nominal frequency shall be less than 2 · 10 .
4.2.2 Justification for requirement
Effective use of the RF spectrum.

The purpose of the test is to verify the ability of the AT to transmit the signal on the correct frequency

assignment for the channel on which it is transmitting within the tolerances defined in subclause 4.2.1 in

order to prevent interference to other TFTS channels.
4.3 RF spectrum mask
4.3.1 Requirement
ETS 300 326-2 [1] subclause 8.8.2.4.

The spectrum mask shall be less than the limits specified in table 1 as the maximum power level at

several frequencies above and below the nominal transmit frequency. The frequency offsets shall be

measured from the nominal centre frequency, not from the actual value, and power levels are given

relative to the transmit power at the nominal frequency.
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TBR 23: March 1998
Table1: Transmitter mask
Frequency offset dB relative to power Measurement bandwidth
(kHz) at centre frequency (Hz)
–11,3 +1 300
-20 300–14,5
-35 300–15,6
-37 300–30
-49 300–60
–-65 300
120
–2 500 -70 1 000
-75 1 000–5 000
4.3.2 Justification for requirement
Effective use of the RF spectrum.

The purpose of the test is to verify the conformance of the AT spectrum mask to the requirements of

ETS 300 326-2 [1]. The measurement is necessary to verify that the AT does not transmit power in

adjacent channels in excess of the levels specified.

The test shall be carried out in continuous modulation mode only and on channels 1, 82 and 164. The RF

mask shall not be measured in burst mode for the reasons given in subclause 6.4.
4.4 Out of band and spurious emissions
4.4.1 Requirement
4.4.1.1 Out of band emissions
ETS 300 326-2 [1] subclause 8.8.2.5.

Out of band emissions from the AT shall be better than -69 dBW/30 kHz at the antenna port, at all

frequencies outside the range 1 797,5 MHz to 1 807,5 MHz.
4.4.1.2 Spurious emissions
ETS 300 326-2 [1] subclause 8.8.2.6.

Spurious emissions shall be measured at the antenna port with the transmitter set to full power in

suppressed modulation mode and then with the transmitter in standby mode.

The spurious emissions at frequencies between 9 kHz and 1 GHz from the TFTS equipment shall not

exceed -58 dBm at the antenna port. The spurious emissions at frequencies between 1 GHz and

12,75 GHz shall not exceed -48 dBm at the antenna port.

This shall be verified by conducted measurements in the band 9 kHz to 12,75 GHz, excluding the AT

transmit band from 1 800 MHz to 1 805 MHz, in the suppressed modulation mode.
4.4.2 Justification for requirement
Effective use of the RF spectrum.

The purpose of the tests is to confirm that the AT can operate without emitting harmful out of band or

spurious energy.

These tests are necessary to ensure that the AT will not cause unacceptable levels of interference to

other channels of the TFTS network or to other radio services in bands adjacent to those allocated to

TFTS.
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TBR 23: March 1998
4.5 Correct decoding of Broadcast Control CHannel (BCCH)
4.5.1 Requirement
ETS 300 326-2 [1] subclause 10.11.3.2.1.

The AT shall be capable of decoding the BCCH channel of the transmission from a Ground Station (GS)

and shall respect the range limit of that GS.
4.5.2 Justification
Protection of the TFTS network.

The correct operation of the TFTS system is in part dependent on the AT correctly recognizing that it is at,

or approaching, the maximum range of the GS with which it is communicating.
4.6 Correct response to shutdown command from the GS
4.6.1 Requirement

If an AT is instructed to shut down by the ground station then it shall do so in the manner specified in

ETS 300 326-2 [1] subclause 10.11.5.2.4.
4.6.2 Justification
Protection of the TFTS network.

It is necessary that a malfunctioning AT responds to a shutdown message from the TFTS ground station

so that it does not adversely affect the TFTS network.
4.7 AT response to timing and power adjustment commands
4.7.1 Requirement
ETS 300 326-2 [1] subclause 8.10.3.

The AT shall respond as specified to commands from a GS relating to adjustment of the AT transmit

power or AT timing.
4.7.2 Justification
Protection of the TFTS network.

An AT transmitting at too high a power or with incorrect timing can cause interference at the GS to signals

being received at that GS from other ATs.
5 The TBR test specification

Where parameters or capabilities are subject to manufacturer's declaration and not a specific test, it shall

be the manufacturer's responsibility to:

a) supply a declaration of implementation in which the manufacturer explicitly affirms the

implementation in the equipment of certain parameters and/or capabilities;

b) be prepared to submit upon request supporting design information including circuit designs and

software source codes demonstrating the implementation of said capabilities;

c) be prepared to supply upon request such test results as are practicable including the test methods

which support the declaration.
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TBR 23: March 1998
5.1 Transmitter power output
5.1.1 Test method
a) the AT shall be set in continuous modulation mode;
b) the transmitter shall be set to channel 82 (1 802,484 848 MHz);
c) the AT mean output power shall be set to give +40 dBm at the antenna port;

d) a power meter shall be connected to the antenna port via suitable external power attenuators;

e) the mean output power shall be calculated as follows:

- meter reading + power attenuation - any calibration required for the meter and power sensor;

and
- shall be checked versus the range specified in subclause 4.1.1;
f) the automatic power control shall be set to reduce the output power by 75 dB;

g) the external power attenuation shall be reduced to give a measurable mean power level at the

power meter;

h) the lowest mean output power shall be calculated as in step e) above and shall be within the range

specified in subclause 4.1.1;

j) the automatic power control shall be set to increase the power in 5 dB steps. The measured output

power at each step shall be calculated as in paragraph e) above and its value at each step shall be

compared to (-35 + 5n) – 2 dBm, where n is the step number and steps 0 and 15 correspond to the

lowest and highest output powers respectively.

NOTE: It may be necessary to adjust the external power attenuation to take account of the

dynamic range of the power meter when increasing the output power in step j).
5.1.2 Test bank characteristics

The test equipment shall consist of a RF power meter (measuring mean power), any associated power

sensor, cabling and power attenuators.

The TFTS transmitter shall be connected to the diplexer by the manufacturer-supplied cable and the

diplexer receiver port shall be terminated in a 50 W load (see figure 1).
RF O/P
Wanted signal
Power attenuation
TFTS TX
-3 db
RX Cable loss
Antenna port
50 terminationW
TFTS Diplexer
Power meter and sensor
Figure 1: Transmitter power measurement test equipment
5.1.3 Measurement uncertainty

The maximum uncertainty for the measurement shall be ±1 dB according to ETR 028 [2].

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TBR 23: March 1998
5.2 Transmitter frequency accuracy
5.2.1 Test method

This test method is to measure the short term frequency accuracy of the transmitter. Verification of long

term frequency accuracy of an AT shall be by manufacturer's declaration.
a) the AT shall be set to suppressed modulation mode;
b) the AT mean output power shall be set to give +40 dBm at the antenna port;
c) the transmitter shall be set to channel 1 (1 800,030 303 MHz);
d) the transmitted frequency at the antenna port shall be recorded;
e) the fractional error shall then be calculated as follows:
|(measured frequency - nominal channel frequency)|
fractional error =
nominal channel frequency

f) steps c) to e) shall be repeated with the AT transmitter set to channel 82 (1 802,484 848 MHz);

g) steps c) to e) shall be repeated with the AT transmitter set to channel 164 (1 804,969 696 MHz);

h) the fractional error in the transmit frequency measured for each channel in steps a) to g) above

shall be compared to the maximum admissible value of 2 · 10 . For guidance, this corresponds to

the measured frequency being contained in the interval (f - 360) Hz to (f + 360) Hz, where

nom nom

f is the nominal frequency in Hertz of the channel to which the transmitter is set.

nom
5.2.2 Test bank c
...

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