ETSI I-ETS 300 235 ed.1 (1994-03)

Radio Equipment and Systems (RES); Technical characteristics, test conditions and methods of measurement for radio aspects of cordless telephones CT1

DI/RES-00002

Radijska oprema in sistemi (RES) - Tehnične karakteristike, preskusni pogoji in merilne metode za brezvrvične telefone CT 1 z radijskega vidika

General Information

• Status: Published
• Publication Date: 11-Mar-1994
• Technical Committee: RES - Radio Equipment & Systems
• Current Stage: 12 - Completion
• Due Date: 01-Mar-1994
• Completion Date: 12-Mar-1994
• Ref Project: PSIST I-ETS 300 235:1999 - Radio Equipment and Systems (RES); Technical characteristics, test conditions and methods of measurement for radio aspects of cordless telephones CT1

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radio Equipment and Systems (RES); Technical characteristics, test conditions and methods of measurement for radio aspects of cordless telephones CT133.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:I-ETS 300 235 Edition 1PSIST I-ETS 300 235:1999en01-september-1999PSIST I-ETS 300 235:1999SLOVENSKI
STANDARD



PSIST I-ETS 300 235:1999



INTERIMEUROPEANI-ETS 300 235TELECOMMUNICATIONMarch 1994STANDARDSource: ETSI TC-RESReference: DI/RES-00002ICS:33.020Key words:Radio, testing, CT1Radio Equipment and Systems (RES);Technical characteristics, test conditions and methods ofmeasurement for radio aspects of cordless telephones CT1ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1994. All rights reserved.PSIST I-ETS 300 235:1999



Page 2I-ETS 300 235: March 1994Whilst 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.PSIST I-ETS 300 235:1999



Page 3I-ETS 300 235: March 1994ContentsForeword.71Scope.92Normative references.93Definitions and abbreviations.103.1Definitions.103.2Abbreviations.104Principles of operation and general requirements.104.1Procedure to set up the RF connection between fixed and portable part.104.2Operating frequencies.114.3General requirements.114.3.1Modulation.114.3.2Antenna.114.3.3Companding.114.3.4Threshold level for field strength and minimum observation time.114.3.5Scanning time.124.3.6Use of the identification code.124.3.6.1General.124.3.6.2The exchange of the code.124.3.6.3The number of codes and their protection.124.3.6.4Wrong identification codes.124.3.7Answering incoming calls.124.3.8Termination of the RF connection and line connection.134.3.8.1Termination of the RF connection.134.3.8.2Interruption of a connection due to low field strength.134.3.9Communication between CFP and CPP.134.3.10Power supply for CPP.134.3.11Power supply for CFP.135Test conditions, power sources and ambient temperatures.145.1Normal and extreme test conditions.145.2Test power source.145.3Normal test conditions.145.3.1Normal temperature and humidity.145.3.2Normal test power source.145.3.2.1Mains voltage and frequency.145.3.2.2Other power sources.145.4Extreme test conditions.145.4.1Extreme temperatures.145.4.2Extreme test voltages.155.4.2.1Mains voltage and frequency.155.4.2.2Other power sources.155.5Procedure for test at extreme temperatures.155.5.1Procedure for equipment designed for continuous operation.156General conditions.166.1Arrangements for test signals applied to the receiver.166.2Receiver circuitry.166.2.1Receiver mute or squelch circuit.166.3Receiver rated audio output power.166.4Normal test modulation.166.5Encoder for receiver measurements.166.6Normal coded test signal.166.7Test fixture.17PSIST I-ETS 300 235:1999



Page 4I-ETS 300 235: March 19946.8Test site and general arrangement for measurements involving the use of radiatedfields.176.8.1Test site.176.8.2Optional indoor test site.176.8.3Test antenna.186.8.4Substitution antenna.196.8.5Auxiliary cables.196.9Interpretation of measurement results.197Transmitter.197.1Frequency error.197.1.1Definition.197.1.2Method of measurement.207.1.3Limits.207.2Carrier power.207.2.1Definition.207.2.2Method of measurement under normal test conditions.207.2.3Limits.217.3Adjacent channel power.217.3.1Definition.217.3.2Method of measurement.217.3.2.1General remarks.217.3.2.2Method of measurement using a power measuringreceiver.217.3.2.3Power measuring receiver specification.227.3.4Limits.237.3AFrequency deviation.237.3A.1Maximum permissible frequency deviation.237.3A.1.1Definition.237.3A.1.2Method of measurement.237.3A.1.3Limits.247.3A.2Response of the transmitter at modulation frequencies above 3 kHz.247.3A.2.1Definition.247.3A.2.2Method of measurement.247.3A.2.3Limits.247.4Intermodulation attenuation.247.4.1Definition.247.4.2Methods of measurement.247.4.3Limits.257.5Spurious emissions.257.5.1Definition.257.5.2Method of measurement.257.5.3Limit.268Receiver.268.1Receiver sensitivity.268.1.1Definition.268.1.2Method of measurement.278.1.3Limits.288.2Message acceptance.288.2.1Definition.288.2.2Method of measurement.288.2.3Limit.288.3Co-channel rejection.288.3.1Definition.288.3.2Method of measurement.288.3.3Limit.298.4Adjacent channel selectivity.298.4.1Definition.298.4.2Method of measurement.298.4.3Limit.298.5Spurious response rejection.298.5.1Definition.29PSIST I-ETS 300 235:1999



Page 5I-ETS 300 235: March 19948.5.2Method of measurement.298.5.3Limit.308.6Intermodulation rejection.308.6.1Definition.308.6.2Method of measurement.308.6.3Limit.318.7Spurious radiations.318.7.1Definition.318.7.2Method of measurement.318.7.3Limit.319Presentation of equipment for testing purposes.329.1Choice of model for testing.329.2Channel selection.329.3Equipment with internal temporary or internal permanent antenna connector.329.4Audio and power supply connections.329.4.1Temporary audio connections.3210Measurement uncertainties.33Annex A (normative):Acoustic coupler.34Annex B (informative):Technical characteristics, test conditions and methods of measurement forradio aspects of cordless telephones CT1+.35Annex C (informative):Additional requirements.36C.1Definitions.36C.2Method of measurement.36C.3Limits.36History.37PSIST I-ETS 300 235:1999



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Page 7I-ETS 300 235: March 1994ForewordThis Interim European Telecommunication Standard (I-ETS) has been produced by the Radio Equipmentand Systems (RES) Technical Committee of the European Telecommunications Standards Institute(ETSI).An ETSI standard may be given I-ETS status when it is regarded either as a provisional solution ahead ofa more advanced standard, or because it is immature and requires a trial period. The life of an I-ETS islimited, at first, to three years after which it may be converted into a European TelecommunicationStandard (ETS), have its life extended for a further two years, be replaced by a new version of the I-ETSor, finally, be withdrawn.This I-ETS contains text concerning the conformance testing of the equipment to which it relates. This textshould be considered solely as guidance, and does not make the I-ETS mandatory.PSIST I-ETS 300 235:1999



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Page 9I-ETS 300 235: March 19941ScopeCordless Telephones (CT1) according to the CEPT Recommendation T/R 24-03 [5] "RadioCharacteristics of Cordless Telephones" are widely used throughout Europe. This I-ETS is produced inorder to maintain the CEPT T/R 24-03 [5] with respect to the development which has taken place sincethe introduction of the CEPT Recommendation in 1984.Equipment according to this I-ETS is in the following designated CT1. CT1 uses the frequency band914 - 915 MHz paired with 959 - 960 MHz providing 40 duplex channels. This frequency band forms partof the allocation for GSM.Therefore, in some countries the frequency band 885 - 887 MHz paired with 930 - 932 MHz providing 80channels has been made available. This equipment is in the following designated CT1+.Either of these frequency bands is available in many, but not all European countries.This I-ETS specifies CT1 equipment only. Deviating requirements for CT1+ equipment are contained inAnnex B.The I-ETS provides:-harmonization on the broadest possible basis, of the radio technical parameters or cordlesstelephones;-a basis for the mutual recognition of test reports;-harmonized test procedures and test conditions for cordless telephones.Where the fixed part of a cordless telephone is connected to the switched telephone network,requirements have to be met in specifying the network access. These requirements are not part of thisI-ETS. Annex C of this I-ETS describes which parameters require different consideration than applied fora wired telephone.2Normative referencesThis I-ETS incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this I-ETS only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies.[1]CCITT Recommendation G.162: "Characteristic of compandors for telephony".[2]ETS 300 086: "Radio Equipment and Systems (RES); Land Mobile Service".[3]CCITT Recommendation O.41: "Psophometer for use on telephone typecircuits".[4]CEPT Recommendation T/R 24-01: "Specifications of equipment for use in theLand Mobile Service".[5]CEPT Recommendation T/R 24-03: "Radio characteristics of cordlesstelephones".PSIST I-ETS 300 235:1999



Page 10I-ETS 300 235: March 19943Definitions and abbreviations3.1DefinitionsFor the purposes of this I-ETS the following definition applies:Cordless Telephone (CT1): a telephone terminal connected to an exchange line or an extension line. Itconsists of at least two parts, fixed and portable respectively, which are connected by a radio link.3.2AbbreviationsFor the purposes of this I-ETS the following abbreviations apply:CTCordless TelephoneCFPCordless Fixed PartCPPCordless Portable PartPSTNPublic Switched Telephone NetworkRFRadio Frequency"Manufacturer" in this I-ETS is meant as the party submitting equipment for testing.4Principles of operation and general requirements4.1Procedure to set up the RF connection between fixed and portable partBoth fixed and portable part comprises a transmitter and a receiver which will perform full duplexoperation. When the need for a radio frequency channel arises in any of the parts of a cordless telephone,this part will act in general as follows:a)the initiating part searches for an idle duplex channel. A channel is considered to be idle if theinitiating part of the cordless telephone senses that the radio frequency field strength on thatspecific channel is below a specified limit;b)on the idle (duplex) channel, found under a), the initiating part starts transmitting signals to thedesired part of the same cordless telephone. These signals contain an identification code whichoffers at least 999999 different combinations;c)the receiver of each part of a cordless telephone is constantly scanning, searching for a signal whichcontains its matching identification code. Upon detection of this code, the receiver stops scanning andinitiates its transmitter to return its identification code to the initiating part on this duplex channel;d)as the receiver of the initiating part detects its matching identification code on the return frequency ofthe selected duplex channel, the duplex channel becomes available.PSIST I-ETS 300 235:1999



Page 11I-ETS 300 235: March 19944.2Operating frequenciesCordless telephones shall be constructed to use all of the following channels of the frequency set CT1.CT1:Channel number and Transmitting frequenciesPortable partFixed part1914,0125 MHz959,0125 MHz2914,0375 MHz959,0375 MHz3914,0625 MHz959,0625 MHz. . . . . . .38914,9375 MHz959,9375 MHz39914,9625 MHz959,9625 MHz40914,9875 MHz959,9875 MHzThe CT1 operating frequency set is not available in all countries (see Annex B).4.3General requirementsThe performance of a CT shall be such that its interaction with the PSTN shall be as near as possible tothat of a wired analog telephone.4.3.1ModulationOnly constant envelope analogue angle modulation shall be used.4.3.2AntennaOnly the use of a non-directional antenna shall be allowed.The antenna of the Cordless Fixed Part (CFP) and the antenna of the Cordless Portable Part (CPP), shallbe an integral antenna. The CFP and the CPP may be fitted with a permanent internal or a temporaryinternal 50 W RF connector which allows access to the transmitter output and the receiver input formeasurement purposes.The use of an external antenna connector is not allowed.4.3.3CompandingTo improve the signal to noise ratio and the subjective quality it is suggested that syllabic compressionand expanding of the audio signal in accordance with CCITT Recommendation G.162 [1] be incorporated.4.3.4Threshold level for field strength and minimum observation timeTo determine the availability of a channel during the scanning procedure the parts of a cordless telephoneshall be equipped with a detector which provides a sensing facility corresponding to the field strength. Achannel shall be considered as not in use if the median level of the field strength is lower than 20 dBrelative to 1 microvolt per metre. The minimum observation time before a channel is considered to beavailable shall be 100 milliseconds.PSIST I-ETS 300 235:1999



Page 12I-ETS 300 235: March 19944.3.5Scanning timeWhen a call is initiated, the scanning procedure shall start immediately.In case the call is initiated by an incoming ringing signal from the telephone line, the scanning procedureshall start within one second after detection of the ringing signal.When a channel is available, the time between initiating a connection, after the set has been idle for atleast 10 seconds, and seizure of the channel shall be no more than 5 seconds. When a free channel islocated the initiating part shall transmit identification signals for not longer than 3 seconds. If a matchingresponse has not been received by the initiating part after 3 seconds, it recommences searching foranother free channel. In the case of an incoming call this procedure continues as long as there is anincoming ringing signal.4.3.6Use of the identification code4.3.6.1GeneralIn the procedure to set up the RF connection between the fixed and the portable parts, the initiating partshall transmit a unique identification code until an answer from the desired part containing the sameunique identification code is received (see subclauses 4.1 and 4.3.5). The exchange of identificationcodes shall ensure that only associated parts will lock to each other.4.3.6.2The exchange of the codeThe identification code shall also be transmitted with every signalling information transmitted over theradio channel from a CPP, which is intended for the telephone line.Signalling information shall only be forwarded to the telephone line if the identification code, which wasreceived, matches to the identification code of the CFP.As an alternative to the above, the identification code shall be used to ensure that only the associatedfixed and portable parts will lock to each other.To ensure continued locking during a call this identification procedure shall be exchanged between CFPand CPP and be repeated at intervals not longer than 45 seconds. This may be achieved by in-bandsignalling or by out-of-band signalling during the conversation.4.3.6.3The number of codes and their protectionThe number of code combinations shall be at least 999 999. Protection against unauthorized changes ofthe code shall be incorporated.4.3.6.4Wrong identification codesIf wrong identification codes are received twice, the RF connection shall be terminated (see subclause4.3.8).4.3.7Answering incoming callsWhen an incoming call is answered by means of a CPP, it shall transmit a coded answer signal, includingthe identification code. On receipt of this signal the fixed part shall create the appropriate line condition.PSIST I-ETS 300 235:1999



Page 13I-ETS 300 235: March 19944.3.8Termination of the RF connection and line connectionAfter termination of the RF connection in accordance with subclauses 4.3.8.1 to 4.3.8.3 the telephone lineloop connection should be immediately released, unless the conversation has been taken over by anotherpart.4.3.8.1Termination of the RF connectionWhen the RF connection is to be terminated, the part of the cordless telephone which initiates thetermination shall transmit 4 times a coded termination message, including the identification code whichwould be used for initiating a RF connection. The RF circuit shall then be disconnected and the cordlesstelephone shall return to the idle condition.4.3.8.2Interruption of a connection due to low field strengthA CPP is considered to be "out of range" if the median level of the field strength at a receiving part is at alevel less than 5 dB above the stated message acceptance level tested under subclause 8.2. The lineconnection and RF connection in use by the cordless telephone shall be terminated automatically if theCPP has remained "out of range" for more than 10 ± 1 seconds. Termination shall be preceded by awarning signal.4.3.9Communication between CFP and CPPThe equipment may provide means of voice communication and/or signalling between CPPs and CFP inorder to perform telephone related functions other than making calls such as intercom, call transfer orcontrol of an answering machine.If the equipment is used for a purpose other than to set up a connection, the CPP shall be able to signaland receive an incoming call.4.3.10Power supply for CPPThe supply voltage is considered to be insufficient if it is lower than the lowest voltage which is mentionedunder "extreme test voltages" for the applicable type of power source. If the supply voltage is insufficient itshall not be possible to establish a RF connection. Means shall be provided to indicate the supply voltagesituation on a CPP.4.3.11Power supply for CFPThe power supply for the fixed part shall not be taken from the PSTN.PSIST I-ETS 300 235:1999



Page 14I-ETS 300 235: March 19945Test conditions, power sources and ambient temperatures5.1Normal and extreme test conditionsTests shall be made under normal t
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