ETSI EN 300 931 V6.0.1 (1999-09)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.UHDOL]DFLMDDigital cellular telecommunications system (Phase 2+) (GSM); Technical realization of facsimile group 3 transparent (GSM 03.45 version 6.0.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 931 Version 6.0.1SIST EN 300 931 V6.0.1:2003en01-december-2003SIST EN 300 931 V6.0.1:2003SLOVENSKI
STANDARD



SIST EN 300 931 V6.0.1:2003



EN 300 931 V6.0.1 (1999-09)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);Technical realization of facsimile group 3 transparent(GSM 03.45 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)2(GSM 03.45 version 6.0.1 Release 1997)ReferenceDEN/SMG-040345Q6 (8mc0300o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frIndividual copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: editor@etsi.frCopyright 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 1999.All rights reserved.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)3(GSM 03.45 version 6.0.1 Release 1997)ContentsIntellectual Property Rights.5Foreword.50 Scope.60.1References.60.2Definitions and abbreviations.71Service definition.82Network architecture.83Reference configuration at the mobile station.93.1Fax Adaptor functionality.103.2GSM Facsimile Machine functionality.104Connection types.114.1Information transfer protocol model.124.2Interactions with T.30.134.2.1Link control strategy.134.2.1.1Message detection.144.2.2Speed conversion for BCS phases.144.2.3Compatibility checking.154.2.3.1Group 1 and Group 2 support.154.2.3.22 400 bit/s handshaking.154.2.3.3Non-standard facilities.154.2.3.412 000 and 7200 bit/s Facsimile Document Transfer.154.2.3.5Procedure interrupts.154.2.4Speed checking.154.3Radio Channel Modification Procedures.164.3.1In Call Modification (ICM).164.3.2Channel Mode Modify (CMM).175Use of terminal adaptation functions.185.1Standard TAFs for synchronous services.185.2Specific TAFs for facsimile service.185.2.1Working principle.185.2.2Basic protocol structure.195.2.2.1Frame formats.195.2.3Protocol description.205.2.3.1IDLE state.205.2.3.2BCS-REC state.205.2.3.3BCS-TRA state.205.2.3.4MSG-REC state.215.2.3.5MSG-TRA state.215.2.4DCS and TCF processing.215.2.5DCN (disconnect) frame.225.2.6Clocking.225.2.7Timeouts.225.3Specific TAFs for facsimile service (T.30/A).235.3.1Frame detection.235.3.2Message phase.235.3.3Additional CMM request.236Signalling aspects.236.1Handling of Tonal Signals.246.2Call establishment.246.2.1Mobile Terminated Call - Speech then Fax.246.2.2Mobile Terminated Call - Auto answer.246.2.3Mobile Originated Call - Speech then Fax.25SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)4(GSM 03.45 version 6.0.1 Release 1997)6.2.4Mobile Originated Call - Auto calling.256.2.5Mobile Originated Call - Manual calling.256.3Call release.267Interworking to fixed networks.267.1Interworking to PSTN.267.2Interworking to ISDN.27Annex I (informative):Protocol entities from CCITT T.30 and T.4.28Annex II (informative):Procedure examples.29Annex III (informative):Change Request History.42History.43SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)5(GSM 03.45 version 6.0.1 Release 1997)Intellectual 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 SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Special Mobile Group (SMG).The present document defines the technical realization of facsimile group 3 using transparent network support within thedigital cellular telecommunications system.The contents of the present document is subject to continuing work within SMG and may change following formal SMGapproval. Should SMG modify the contents of the present document it will be re-released with an identifying change ofrelease date and an increase in version number as follows:Version 6.x.ywhere:6indicates Release 1997 of GSM Phase 2+xthe second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates,etc.ythe third digit is incremented when editorial only changes have been incorporated in the specification.The specification from which the present document has been derived was originally based on CEPT documentation,hence the presentation of the present document may not be entirely in accordance with the ETSI/PNE Rules.Proposed national transposition datesDate of adoption of this EN:3 September 1999Date of latest announcement of this EN (doa):31 December 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 June 2000Date of withdrawal of any conflicting National Standard (dow):30 June 2000SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)6(GSM 03.45 version 6.0.1 Release 1997)0ScopeThe present document deals with the procedures allowing the technical realization of the Group 3 facsimile Servicewithin the GSM PLMN using transparent Network support, according to the definition of Teleservice 61 and 62specified in the GSM 02.03 [2].0.1ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, 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.· For this Release 1997 document, references to GSM documents are for Release 1997 versions (version 6.x.y).[1]GSM 01.04: "Digital cellular telecommunication system (Phase 2+): "Abbreviations andacronyms".[2]GSM 02.03: "Digital cellular telecommunication system (Phase 2+); Teleservices supported by aGSM Public Land Mobile Network (PLMN)".[3]GSM 02.34: “Digital cellular telecommunications system (Phase2+): High Speed Circuit SwitchedData (HSCSD) - Stage1”.[4]GSM 03.10: "Digital cellular telecommunication system (Phase 2+); GSM Public Land MobileNetwork (PLMN) connection types".[5]GSM 03.34: "Digital cellular telecommunications system (Phase2+): High Speed Circuit SwitchedData (HSCSD) - Stage2.[6]GSM 04.02: "Digital cellular telecommunication system (Phase 2+); GSM Public Land MobileNetwork (PLMN) access reference configuration".[7]GSM 04.08: "Digital cellular telecommunication system (Phase 2+); Mobile radio interface layer 3specification".[8]GSM 04.21: "Digital cellular telecommunication system (Phase 2+); Rate adaption on the MobileStation - Base Station System (MS - BSS) interface".[9]GSM 07.01: "Digital cellular telecommunication system (Phase 2+); General on TerminalAdaptation Functions (TAF) for Mobile Stations (MS)".[10]GSM 07.03: "Digital cellular telecommunication system (Phase 2+); Terminal AdaptationFunctions (TAF) for services using synchronous bearer capabilities".[11]GSM 09.07: "Digital cellular telecommunication system (Phase 2+); General requirements oninterworking between the Public Land Mobile Network (PLMN) and the Integrated ServicesDigital Network (ISDN) or Public Switched Telephone Network (PSTN)".[12]CCITT Recommendation T.35: "Procedure for the allocation of CCITT members' codes".[13]CCITT Recommendation F.160 Fascicle II.5: "General operational provision for the internationalpublic facsimile".SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)7(GSM 03.45 version 6.0.1 Release 1997)[14]CCITT Recommendation T.4 Fascicle VII.3: "Standardization of group 3 facsimile apparatus fordocument transmission".[15]CCITT Recommendation T.30 Fascicle VII.3: "Procedures for document facsimile transmission inthe general switched telephone network".[16]CCITT Recommendation V.21 Fascicle VIII.l: "300 bits per second duplex modem standardizedfor use in the general switched telephone network".[17]CCITT Recommendation V.24 Fascicle VIII.l: "List of definitions for interchange circuits betweendata terminal equipment (DTE) and data circuit-terminating equipment (DCE)".[18]CCITT Recommendation V.25bis Fascicle VIII.l: "Automatic calling and/or answering equipmenton the general switched telephone network (GSTN) using the 100-series interchange circuits".[19]CCITT Recommendation V.27ter Fascicle VIII.l: "4 800/2 400 bits per second modemstandardized for use in the general switched telephone network".[20]CCITT Recommendation V.29 Fascicle VIII.l: "9 600 bits per second modem standardized for useon point-to-point 4-wire leased telephone-type circuits".[21]CCITT Recommendation V.33 Fascicle VIII.l: "14 400 bits per second modem standardized foruse on point-to-point 4-wire leased telephone-type circuits".[22]CCITT Recommendation X.300 Fascicle VIII.6: "General principles for interworking betweenpublic networks, and between public networks and other networks for the provision of datatransmission services".[23]CCITT Recommendation V.17: "A 2-wire modem for facsimile applications with rates up to 14400 bit/s".0.2Definitions and abbreviationsIn addition to those below, abbreviations used in the present document are listed in GSM 01.04 [1].BCSBinary Coded Signalling phase of Facsimile transmission as per CCITT T.30CT105Interchange Circuit 105 as per CCITT V.24CT106Interchange Circuit 106 as per CCITT V.24CT107Interchange Circuit 107 as per CCITT V.24CT108.2Interchange Circuit 108/2 as per CCITT V.24CT109Interchange Circuit 109 as per CCITT V.24CT114Interchange Circuit 114 as per CCITT V.24CT115Interchange Circuit 115 as per CCITT V.24FA/MTThe Fax Adaptor specifically located at MT sideFA/IWFThe Fax Adaptor specifically located at IWF sideMSGMessage phase of Facsimile transmission as per CCITT T.30All protocol entities from CCITT Facsimile Recommendations (T.4 and T.30) apply; in the present document they arereferenced to in the same way as in the above CCITT Recommendations (see also annex I to the present document).SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)8(GSM 03.45 version 6.0.1 Release 1997)1Service definitionThe fixed network Group 3 Facsimile service, as basically defined in CCITT Recommendation F.160, is an internationaltelematic service for ISO A4 document transmission between two facsimile stations.The service specification is comprised of two parts: the control protocol described in CCITT Recommendation T.30,and the document transmission coding described in CCITT Recommendation T.4.The GSM facsimile Teleservice is intended to allow facsimile connections between group 3 apparatus using:-a GSM PLMN as a stand alone facility, for mobile to mobile communication;-a GSM PLMN to gain access to fixed networks PSTN and ISDN, for mobile to/from land communication.For this Teleservice, the document coding is as CCITT Recommendation T.4 with no modifications. The protocol usedis CCITT Recommendation T.30 modified within the PLMN as detailed in the present document.The interworking between different networks is based on CCITT Recommendation X.300.The particular features of this Teleservice are:-it uses point-point communication;-the information transfer capability is dual "Speech"/"Group 3 Facsimile" for Teleservice 61 and "Group 3Facsimile" only for Teleservice 62;-both mobile originated and terminated calls are supported;-the information transfer mode is circuit, duplex, synchronous and symmetric;-different end-to-end transfer rates are used within the same call to take advantage of the better radio path errorrate;-use of a standard synchronous terminal adaptation function (as per GSM 07.03) within the MS.2Network architectureThe network architecture applicable to this Teleservice is shown in figure 1/03.45, below.FAXBSSMSC/IWFPSTNISDNPLMNvMTvFAXFigure 1/03.45: Network architectureThis shows the case of mobile to fixed network interworking. For mobile to mobile calls, there would effectively be aloop back within the PLMN, using two IWFs.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)9(GSM 03.45 version 6.0.1 Release 1997)3Reference configuration at the mobile stationThe mobile reference configurations described in this clause are defined as per GSM 04.02.TASTAFAX Adapt.TARf)MT0MT1MT1MT1MT2MT2UmFAX/FAX2w/FAX2wFAXR/FAX2wa)b)c)d)e)
Mobile Station FAX Adapt.FAX Adapt.FAX Adapt.FAX Adapt.Figure 2/03.45: Reference configurationsThe Teleservice definition in GSM 02.03 regards the group 3 facsimile terminal as a 2-wire analogue terminatedequipment. In order to connect this to the MT2 a separate "Fax Adaptor" device is necessary.This configuration, shown in figure 2a/03.45, has to be considered as the standard configuration, so that all the existingGroup 3 facsimile apparatus can be connected to the PLMN.An alternative realization would be to combine a standard group 3 facsimile machine and the Fax Adaptor into aspecially developed "GSM facsimile machine", directly providing a digital output. Although such a device must appearto the MT2 as identical to the Fax Adaptor (i.e. with an identical interface and protocol), it would allow for asignificantly smaller and simpler facsimile machine. This configuration is shown in figure 2d/03.45 and is regarded as adesirable alternative.In addition of course, it is always possible to realize an MT0, as per figure 2f/03.45, where both the facsimile andmobile termination functions are considered to be part of one integrated unit.The remaining configurations concern the use of an S interface and are considered as optional configurations. Their useis for further study.The particular terminal adaptation functions used are those detailed in GSM 07.03 and the interface to the MT2 used issynchronous V.24 with an option for support of V.25bis procedures for autocalling and autoanswering.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)10(GSM 03.45 version 6.0.1 Release 1997)3.1Fax Adaptor functionalityThe Fax Adaptor block, figure 3/03.45, is intended to specifically complement the Group 3 facsimile apparatus in orderto be able to communicate over a GSM PLMN.R2WPROTOCOL MONITORING
& CONTROL COMPOSITE
MODEMTONE HANDLINGFigure 3/03.45: Fax Adaptor schemeWhether it has to be a function internal to the GSM PLMN, or an external accessory associated with the Group 3apparatus, is beyond the scope of the present document, and in any case, does not affect at all the working of theprocedure as here described.It can be functionally partitioned in two sections:-an analogue section, dealing with:-the modulation and demodulation processes according to CCITT Recommendation V.21, V.27ter, V.29 andV.17 as explained in T.4 and T.30;-handling of the signalling on the 2-wire path to the facsimile machine, including autocalling and autoanswerfunctions where necessary (see clause 6).-a digital section, dealing with:-monitoring and where necessary, manipulation of the T.30 protocol as detailed in the rest of the presentdocument;-overall control of the adaptor;-connection over the synchronous V.24 interface to the MT as described in GSM 07.03;-where necessary, autocalling and autoanswering functions according to V.25bis.In the following this specification will reference the Fax Adaptor functionality, considering the most general case whereit operates as a full-featured (see figure 3/03.45) separate block (see figure 2a/03.45), as this reference configuration isimplicitly or explicitly exhaustive of all service related technical aspects.3.2GSM Facsimile Machine functionalityThe special GSM facsimile machine shown in the MS configuration of figure 2d/03.45 has a similar functionality to thedigital part of the Fax Adaptor, but without any of the analogue portions.It appears over the V.24 interface as identical to the Fax Adaptor, i.e. the MT2 needs to have no knowledge of theparticular configuration used.When necessary this reference configuration, will be explicitly referenced to in the following; otherwise all technicalaspects relevant to the configuration implicitly apply.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)11(GSM 03.45 version 6.0.1 Release 1997)4Connection typesTable 1/03.45 shows the connection elements attributes applicable to this Teleservice (note), adapted from GSM 03.10.NOTE:Teleservice 61 includes both speech and data connection types, but Teleservice 62 only the dataconnection type.Table 1/03.45: Elements of connection typesProtocol typeof Figure 6 of TSGSM 03.10Access to TAFof the MobileStationRadio interfaceconnection elementIntermediaterateRA1 to RA2BS-MSC/IWFconnectionelementModel 6: Speech-Speech/GSM-CCITTA-lawModel 5:FacsimileGroup 3C/D/S UDI- 14.4 kbit/s- 9.6 kbit/s- 4.8 kbit/s- 2.4 kbit/s(note)C/D/S UDI- 14.5 kbit/s- 12.0 kbit/s-
6.0
kbit/s-
3.6
kbit/s C/D/S UDI- 16 kbit/s- 16 kbit/s-
8 kbit/s-
8 kbit/sC/D/S UDI- 64 kbit/s- 64 kbit/s- 64 kbit/s- 64 kbit/sModel 5bFacsimileGroup 3C/D/S UDI- 14.4 kbit/s-
9.6 kbit/s-
4.8 kbit/s-
2.4 kbit/sC/D/S UDI14,5 or 2X12 kbit/s12
or 2X6 kbit/s6 kbit/s6 kbitsC/D/S UDI16 or 2X16 kbit/s16 or 2X8 kbits8 kbit/s8 kbit/sC/D/S UDI- 64 kbit/s- 64 kbit/s- 64 kbit/s- 64 kbit/sNOTE: The highest Access Rate actually supported in this teleservice will be consistent with the highest Access Rateof the Transparent Bearer Service provided by the Network Operator.C = Circuit switchedS = SynchronousD = Full-duplexUDI = Unrestricted Digital InformationTable 1a/03.45Fax modem ratesNo. of substreamsRadio i/f rateIntermediate RatePadding Scheme14.4 kbit/s1214,5 kbit/s12 kbit/s16 kbit/s16 kbit/s12.0 kbit/s1214,5 kbit/s12 kbit/s16 kbit/s16 kbit/sFA(5D + S)FA(5D + S)9.6 kbit/s1212 kbit/s6 kbit/s16 kbit/s8 kbit/s7.2 kbit/s1212 kbit/s6 kbit/s16 kbit/s8 kbit/sFA(3D + S)FA(3D + S)4.8 kbit/s16 kbit/s8 kbit/s2.4 kbit/s16 kbit/s8 kbit/sFA = Padding is performed in the FA(nD + mS) means that m SYNC frames will be added every n’th DATA frameThe MS must support the combinations in table 1a/03.45, restricted to what has been negotiated between the MS and thenetwork.All transitions from one combination in table 1a/03.45 to another combination in the same table, must be supported bythe MS, as long as the fax modem rate is kept constant or the transition of fax modem rate is performed in steps of 2,4kbit/s.The figure 4/03.45 shows the scheme of a typical GSM PLMN connection for this Teleservice, considering respectivelyR and S access at Network Termination.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)12(GSM 03.45 version 6.0.1 Release 1997)To grant full support to the CCITT Recommendation T.30, requiring different transmission speeds, the followingstrategy shall be implemented:-PLMN provides for four Access Rates only, that is 14 400 bits/s, 9600 bit/s, 4800 bit/s, 2400 bit/s;-radio channel modification procedures are used for switching between Speech phase and facsimile phase, as wellas to select the suitable Access Rate (14 400,9600/4800/2400 bit/s) within the facsimile phase, as resulting fromthe preliminary end-to-end negotiation between the terminals;-to transport Binary Coded Signalling (BCS) requiring a synchronous 300 bit/s bit-rate, speed conversion will beused at both the PLMN ends.S I/F2wAdaptorMT1PLMN2wFAXAdaptorMSC/IWFFAXAdaptorDTE2wDCEMT2PLMN2wGR 3 ApparatusFAXAdaptorMSC/IWF3.1 kHz audio3.1 kHz audioR I/F (V.24)GR 3 ApparatusGR 3 ApparatusGR 3 ApparatusFAXTAFigure 4b/03.45: Optional Teleservice connection (F.F.S)4.1Information transfer protocol modelThe Figure 5/03.45 depicts the conceptual protocol model for this Teleservice, deduced from model 5 and 5b of Figure6/03.10.The main point to be underlined is that all the protocol modules specific for this Teleservice are confined in the FaxAdaptation functions at both the MT and IWF ends. Note that model
5b of figure 6/03.10 details the placing of thesplitting and combiner function for multislot configurations.SIST EN 300 931 V6.0.1:2003



ETSIEN 300 931 V6.0.1 (1999-09)13(GSM 03.45 version 6.0.1 Release 1997)T.30RA2RA1'FECFECRA2RA1I/F CctI/F CctMobile StationBase StationMSC/IWFR
I/FRadio I/F
BSS-MSC
I/F
Fax Adapt.
Fax Adaptation
function
Fax Adaptation
functionT.30RA1RA1'Figure 5/03.45: Information transfer protocol model4.2Interactions with T.30The philosophy of this specification is to allow the T.30 protocol to pass transparently wherever possible, through theFax Adaptors at both ends of the PLMN channel. Manipulations are only made to the protocol where necessary toovercome problems resulting from the differences between the PSTN and the GSM system. Basically, these problemsfall into four categories:-supporting facsimile on a digital connection type;-bit errors during transfer of BCS frames;-the need to change speed to reduce the impact of bit errors during transfer of Fax encoded Messages;-inability to support some features of T.30.4.2.1Link control strategyThough the T.30 procedure is plain half-duplex, between the FAs at both the GSM PLMN ends a full-duplex modeconnection will be established. Information tran
...