SIST EN 300 789:2000

• Abstract:

  To provide for testing methods of the phase 1 TFTS standard (speech services). A separate I-ETS (-05003), which needs further consideration, would deal with the facsimile & data services.

• Status: Published
• Publication Date: 31-Mar-2000
• ICS: 33.060.99 - Other equipment for radiocommunications
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2000
• Due Date: 01-Apr-2000
• Completion Date: 01-Apr-2000
• Ref Project: ETSI EN 300 789 V1.1.1 (1998-03) - ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Terrestrial Flight Telecommunications System (TFTS); Avionic termination radio testing specification

SIST EN 300 789:2000 is the Slovenian adoption of ETSI EN 300 789 V1.1.1 for Electromagnetic Compatibility and Radio Spectrum Matters (ERM) in the Terrestrial Flight Telecommunications System (TFTS). It specifies radio testing methods for the Avionic Termination (AT) used in TFTS phase 1 speech services, so engineers can check transmitter, receiver and emission performance of airborne terminal equipment.

What does SIST EN 300 789:2000 specify?

SIST EN 300 789:2000 specifies the measurements used to test the radio characteristics of the TFTS Avionic Termination. The document is focused on testing methods and measurement conditions, not on defining a full conformance testing specification.

The scope is limited to TFTS phase 1 speech services. The foreword and scope point to a separate I-ETS (-05003) for facsimile and data services.

The document is organized into:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Definitions, abbreviations and symbols
• Clause 4 - Frequency range and radio channel arrangement
• Clause 5 - General aspects of TFTS testing procedures
• Clause 6 - Tests of radio aspects of the physical layer

Clause 5 sets the general test approach, including protection of the TFTS network and other radio services, access to signals, environmental conditions and power supply. Clause 6 contains the detailed radio tests.

What are the key requirements of SIST EN 300 789:2000?

SIST EN 300 789:2000 defines the frequency bands, modulation, test conditions and radio-performance measurements that laboratories use to verify TFTS AT equipment. The main practical point is that the AT is tested at the antenna port, under controlled environmental and power conditions, with results compared against the limits referenced from ETS 300 326-2.

Radio interface and operating range

Clause 4 gives the TFTS terrestrial aeronautical public correspondence bands:

• 1 670 MHz to 1 675 MHz for ground to air use, as AT receive
• 1 800 MHz to 1 805 MHz for air to ground use, as AT transmit

It also defines 164 paired RF channels and states that the modulation method is p/4 Differential Quaternary Phase Shift Keying (p/4 DQPSK). In practice, this tells the tester which channels and waveform the AT must use during measurement.

General test setup

Clause 5 says the tests use standard interface points and are made at the antenna port unless stated otherwise, with a 3 dB cable loss assumption between the diplexer and the antenna port. It also sets environmental conditions of temperature, humidity and pressure, and requires a 115 V AC, 400 Hz single-phase supply in line with ARINC characteristic 752.

For engineers, this matters because the same setup is used to compare equipment from different manufacturers and to keep measurements repeatable.

Emissions and transmitter quality

Clause 6 checks unwanted emissions, modulator and transmitter accuracy, frequency error, mean transmitter output power and the RF spectrum mask. Unwanted emissions are measured as peak power with the diplexer connected, and the document separates out-of-band emissions from spurious emissions.

The transmitter quality checks cover rms error and modulator offset, while the frequency error test verifies short-term tuning accuracy. The power tests verify the nominal mean output power, automatic power control steps, and the reduced power state when Weight On Wheels (WOW) is TRUE. In practice, these tests show whether the AT stays on frequency, stays within its spectrum mask, and does not radiate too much power into other channels.

Receiver performance

Clause 6 also checks receiver sensitivity under thermal noise, in-band intermodulation, co-channel interference and adjacent-channel interference. The results are expressed as Bit Error Ratio (BER) limits at the demodulator output.

This is important because it shows how well the AT can receive wanted traffic while nearby TFTS channels or other signals are present.

What terms does SIST EN 300 789:2000 define?

• Avionic Termination (AT) - The TFTS airborne terminal equipment that is tested by this document.
• Aeronautical Public Correspondence (APC) - The service carried in the TFTS frequency range defined in Clause 4.
• Bit Error Ratio (BER) - The ratio used to judge receiver performance in the sensitivity and interference tests.
• Power Flux Density (PFD) - A received-signal measure used in the receiver sensitivity tests.
• p/4 Differential Quaternary Phase Shift Keying (p/4 DQPSK) - The modulation used by TFTS, with its phase constellation defined in Clause 4.
• Weight On Wheels (WOW) - The aircraft-ground state used in the reduced-power requirement.

Who uses SIST EN 300 789:2000?

SIST EN 300 789:2000 is used by avionics manufacturers, radio test laboratories, compliance teams and quality managers working on TFTS AT equipment. It is also relevant to engineers responsible for transmitter tuning, receiver sensitivity, unwanted emissions and spectrum-mask verification.

Procurement teams may use it when checking whether a terminal is built for the TFTS speech-service interface defined by ETS 300 326-2. Because the equipment is airborne, the document is also relevant to certification and validation work that depends on controlled test conditions.

Which standards are used with SIST EN 300 789:2000?

SIST EN 300 789:2000 relies on several named references:

• ETS 300 326-2 - Provides the TFTS speech-services radio interface and the detailed limits that the tests verify.
• ETR 028 - Provides the basis for measurement uncertainty calculations.
• The Radio Regulations of the International Telecommunications Union (1993) - Provides the reference definition of unwanted emissions.
• ARINC characteristic 752 - Provides the airborne equipment characteristic and power-supply basis used for testing.
• EUROCAE ED-14C - Provides environmental conditions and test procedures for airborne equipment.

What does the SIST EN 300 789:2000 document contain?

The document contains measurement methods, test conditions, reference setups and acceptance checks for TFTS AT radio testing. It includes a standard equipment list in Clause 6, along with example test configurations and setup figures for emissions, transmitter accuracy, frequency error, power, receiver sensitivity and channel-interference testing.

It also includes a spectrum-mask table and an interferer-level table, which are used to compare measured performance against the required RF limits. The figures show practical loopback and antenna-port arrangements, so test houses can reproduce the measurements with the same signal paths.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Terrestrial Flight Telecommunications System (TFTS); Avionic termination radio testing specification49.060Aerospace electric equipment and systems33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 300 789 Version 1.1.1SIST EN 300 789:2000en01-april-2000SIST EN 300 789:2000SLOVENSKI
STANDARD
European Telecommunications Standards Institute EN 300 789 V1.1.1 (1998-03)European Standard (Telecommunications series)Electromagnetic compatibilityand Radio spectrum Matters (ERM);Terrestrial Flight Telecommunications System (TFTS);Avionic termination radio testing specificationSIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)2ReferenceDEN/ERM-RP05-01/4 (7b000ico.PDF)KeywordsRadio, testing, TFTSETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail]://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo 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.SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)3ContentsIntellectual Property Rights.5Foreword.51Scope.62Normative references.63Definitions, abbreviations and symbols.63.1Definitions.63.2Abbreviations.73.3Symbols.74Frequency range and radio channel arrangement.74.1Frequency range.74.2Radio channel arrangement.74.3Modulation.85General aspects of TFTS testing procedures.95.1Protection of the TFTS network.95.2Protection of other services.95.3Access to signals.95.4Environmental conditions for tests.95.5Power supply requirements.96Tests of radio aspects of the physical layer.106.1General.106.1.1Documentation.106.1.2Limits for radio measurements for conformance testing.106.1.2.1Unwanted emissions.106.1.2.2Modulator and transmitter accuracy.106.1.2.3Frequency error.106.1.2.4Transmitter output power.106.1.2.5RF spectrum.106.1.2.6Receiver sensitivity without interferer.106.1.2.7Co-channel sensitivity.106.1.2.8Adjacent channel sensitivity.116.1.3Test apparatus.116.1.4AT testing facilities.116.1.4.1Direct control of AT.116.1.4.2Loopback facility.116.1.4.3Continuous modulation mode.126.1.4.3.1Test signals.126.1.4.4Suppressed modulation mode.126.1.4.5Standby mode.126.1.5Mean to peak ratio of p/4)DQPSK modulation.126.1.6Uncertainty in measurements.136.1.7Measurements made under continuous or burst modulation.136.1.8EMC.136.2Measurement of unwanted emissions.136.2.1General.136.2.2Reference documents and specification.136.2.2.1Out of band emissions.136.2.2.2Spurious emissions.136.2.3Purpose of the tests.146.2.4Method of measurement.146.2.4.1Out of band emissions.146.2.4.2Spurious emissions.146.2.5Test bank characteristics.14SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)46.2.6Measurement uncertainty.156.3Modulator and transmitter accuracy.156.3.1General.156.3.2Reference documents and specification.156.3.3Purpose of the test.156.3.4Method of measurement.166.3.5Test bank characteristics.166.3.6Measurement uncertainty.166.4Frequency error.166.4.1General.166.4.2Reference documents and specification.166.4.3Purpose of the test.166.4.4Method of measurement.166.4.5Test bank characteristics.176.4.6Measurement uncertainty.176.5Mean transmitter output power.176.5.1General.176.5.2Mean transmitter power output under continuous transmission.176.5.2.1Reference documents and specification.176.5.2.2Purpose of the test.176.5.2.3Method of measurement.186.5.2.4Test bank characteristics.186.5.2.5Measurement uncertainty.186.6RF spectrum mask.196.6.1General.196.6.2Reference documents and specification.196.6.3Purpose of the test.196.6.4Method of measurement.196.6.5Test bank characteristics.196.6.6Measurement uncertainty.206.7Receiver sensitivity.206.7.1General.206.7.2Receiver sensitivity with thermal noise.206.7.2.1Reference documents and specification.206.7.2.2Purpose of the test.206.7.2.3Method of measurement.206.7.2.4Test bank characteristics.216.7.2.5Measurement uncertainty.216.7.3Receiver sensitivity with in-band intermodulation products.216.7.3.1Reference documents and specification.216.7.3.2Purpose of the test.216.7.3.3Method of measurement.216.7.3.4Test bank characteristics.216.7.3.5Measurement uncertainty.226.8Co-channel and adjacent channel sensitivity.226.8.1General.226.8.2Reference document and specification.226.8.3Purpose of the test.236.8.4Method of measurement.236.8.5Test bank characteristics.236.8.6Measurement uncertainty.24History.25SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)5Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates onhttp://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.ForewordThe European Standard (Telecommunications series) has been produced by ETSI Technical Committee Electromagneticcompatibility and Radio spectrum Matters (ERM).National transposition datesDate of adoption of this EN:20 February 1998Date of latest announcement of this EN (doa):30 June 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 December 1998Date of withdrawal of any conflicting National Standard (dow):31 December 1998SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)61ScopeThe present document specifies the measurements to be made to test the radio characteristics of the Avionic Termination(AT) of the Terrestrial Flight Telecommunications System (TFTS), operating in the frequency bands 1 670 MHz to1 675 MHz (receive) and 1 800 MHz to 1 805 MHz (transmit), and designed according to ETS 300 326 -2 [1]. Thepresent document does not constitute a full Conformance Testing Specification for the TFTS AT.2Normative referencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case the latest version applies.A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]ETS 300 326-2 (1996): "Radio Equipment and Systems (RES); Terrestrial Flight TelephoneSystem (TFTS); Part 2: Speech services, radio interface".[2]ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the measurement of mobileradio equipment characteristics".[3]The Radio Regulations of the International Telecommunications Union (1993).[4]ARINC characteristic 752 (January 1993): "Terrestrial Flight Telephone System (TFTS) AirborneRadio Subsystem".[5]EUROCAE ED-14C: "Environmental Conditions and Test Procedures for Airborne Equipment".3Definitions, abbreviations and symbols3.1DefinitionsFor the purposes of the present document, the following definitions apply:out-of-band emission: Emission on a frequency or frequencies immediately outside the necessary bandwidth whichresults 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 ofwhich may be reduced without affecting the corresponding transmission of information. Spurious emissions includeharmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but excludeout-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 ensurethe 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.SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)795% confidence level: 1,96 times the total standard deviation. Based on Student's t factor.continuous modulation mode: See subclause 6.1.4.3.suppressed modulation mode: See subclause 6.1.4.4.burst mode: Transmission with one or more of the four voice channels switched off.antenna port: The end of the diplexer to antenna cable that is connected to the antenna, see subclause 5.3.3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply:p/4 DQPSKp/4 Differential Quaternary Phase Shift KeyingAPCAeronautical Public CorrespondenceAT Avionic TerminationBERBit Error Ratioc/icarrier to interference ratioDQPSKDifferential Quaternary Phase Shift KeyingGSGround StationISIInter Symbol InterferenceOSIOpen System InterconnectPFDPower Flux Densityppmparts per millionPRBSPseudo Random Bit SequenceRFRadio Frequencyrmsroot mean squareTDMATime Division Multiple AccessTFTSTerrestrial Flight Telecommunications SystemWOWWeight On Wheels3.3SymbolsFor the purposes of the present document, the following symbol applies:C0modulator offset (see subclause 6.3.2)4Frequency range and radio channel arrangementThe frequency range and channel arrangements are specified in ETS 300 326-2 [1] subclauses 8.8.1.1.1 and 8.8.1.1.2.4.1Frequency rangeThe frequency range for terrestrial Aeronautical Public Correspondence (APC) is as follows:-1 670 MHz to 1 675 MHz for ground to air use (AT receive);-1 800 MHz to 1 805 MHz for air to ground use (AT transmit).4.2Radio channel arrangementThe Terrestrial Flight Telecommunications System (TFTS) radio frequency channel arrangement provides for 164 pairsof Radio Frequency (RF) channels (one channel for each direction of transmission). The centre frequencies of thesechannels are given by the following:-Fg(n) = 1 670 + n/33 MHz;SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)8-Fa(n) = Fg(n) + 130 MHz;where:-Fg(n) is the frequency of the nth ground transmit channel;-Fa(n) is the frequency of the nth airborne transmit channel;-n is the channel number (1 to 164).Where frequencies have been specified in the present document, they are rounded up with a resolution of 1 Hz.4.3ModulationThe modulation method used shall be p/4 Differential Quaternary Phase Shift Keying (p/4 DQPSK). The modulationscheme shall use the phase constellation shown in figure 1.Q101IFigure 1: p/4 DQPSK constellationSIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)95General aspects of TFTS testing proceduresTwo testing procedures are covered by the present document: a testing procedure for the protection and compatibility ofthe TFTS network equipment and a testing procedure for the protection of other radio services.5.1Protection of the TFTS networkThese tests may be described as assuring that:-interchange of TFTS equipment from several manufacturers is possible;-no harm is done to the TFTS network.5.2Protection of other servicesBasic tests to ensure that the level of protection afforded to other services is as has been specified in ETS 300 326-2 [1].These tests may be described as assuring that no unacceptable interference occurs to other radio services.5.3Access to signalsThe standard interface points of the AT shall be used for testing purposes, see subclause 6.2 of ETS 300 326 part 2 [1]:Ua interface: This shall be replaced by an equivalent interface at the AT transceiver RF access points which shall allowfor the connection of signals coming from or going to the RF test system. Measurements shall be made at the antennaport, unless stated otherwise, using the antenna feed cable.This test configuration has assumed a cable loss of 3 dB between the diplexer and the antenna port, see figure 2.TXRXAeTFTS DiplexerRF o/pTFTS Tx/RxRF i/pTFTS AntennaCable loss 3 dBAntenna portFigure 2: Antenna port interface point5.4Environmental conditions for tests-temperature:15 °C to 35 °C;-relative humidity:20 % to 75 %;-pressure:990 mBar to 1 014 mBar.Testing under other environmental conditions will have been undertaken by manufacturers according to ARINCcharacteristic 752 [4] and EUROCAE ED-14C [5] and shall not be repeated for the present document.5.5Power supply requirementsThe power supply shall be in accordance with ARINC characteristic 752 [4] i.e. 115 V AC (nominal) supply at 400 Hz(nominal) single phase.SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)106Tests of radio aspects of the physical layerThe physical layer is the lowest level of the Open System Interconnect (OSI) reference model and supports all of thefunctions required for the transmission of bit streams on the physical medium (see ETS 300 326 part 2 [1],subclause 8.1).6.1GeneralThis subclause describes the tests that are necessary to ensure conformance to the required protection criteria for otherservices operating in the same or adjacent bands to those used by TFTS as given in subclause 4.1 and the tests necessaryto ensure that no unacceptable interference is caused to other radio services elsewhere in the radio spectrum.6.1.1DocumentationLayer 1 TFTS Radio Interface requirements are given in the following subclauses of ETS 300 326-2 [1]:-8.6Time Division Multiple Access (TDMA) characteristics;-8.7Modulation characteristics;-8.8Radio transmission and reception characteristics;-8.10Radio sub-system link control;-8.11Radio sub-system synchronisation.6.1.2Limits for radio measurements for conformance testing6.1.2.1Unwanted emissionsETS 300 326-2 [1] subclauses 8.8.2.5 and 8.8.2.6.6.1.2.2Modulator and transmitter accuracyETS 300 326-2 [1] subclause 8.7.2.3.6.1.2.3Frequency errorETS 300 326-2 [1] subclause 8.8.1.3.1.6.1.2.4Transmitter output powerETS 300 326-2 [1] subclause 8.8.2.2.1.6.1.2.5RF spectrumETS 300 326-2 [1] subclause 8.8.2.4.6.1.2.6Receiver sensitivity without interfererETS 300 326-2 [1] subclause 8.8.3.2.1.6.1.2.7Co-channel sensitivityETS 300 326-2 [1] subclause 8.8.3.2.3.SIST EN 300 789:2000

EN 300 789 V1.1.1 (1998-03)116.1.2.8Adjacent channel sensitivityETS 300 326-2 [1] subclause 8.8.3.2.4.6.1.3Test apparatusThe tests require the AT to be set up in various power and frequency configurations which require a suitably interfacedtest system to command the AT directly (see subclause 6.1.4.1).Certain items of standard test equipment are required, these are given in table 1.Table 1: Standard test equipmentItemDescriptionAT control test softwareMeans of controlling AT functions without a Ground Station (GS) (e.g.RS232 interface on AT with control command set and ability to readdata from the AT).Spectrum AnalyserSweep 9 kHz to 12,75 G
...