1、Standard ECMA-276June 1998Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chPrivate Integrated Services Network(PISN) -Reference Configuration for PINXExtension Lines.Standard ECMA-276June 1998Standa
2、rdizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chIW Ecma-276.doc 09-07-98 11,39Private Integrated Services Network(PISN) -Reference Configuration for PINXExtension Lines.Brief HistoryIn general, the PTS i
3、nfrastructure consists of a series of transceivers, i.e. functional groupings which can perform reception,amplification, regeneration and sending of physical signals presented to them on the extension line. In the simplest case thesetransceiver functional groupings may be NULL, i.e. the extension li
4、ne consists of a simple physical wiring.This ECMA Standard establishes the rules according to which a generic PTS functional grouping can be modelled to match theparticular needs of an application, requiring active equipment in the extension line.This Standard is based upon the practical experience
5、of ECMA member companies and the results of their active andcontinuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardizationbodies. It represents a pragmatic and widely based consensus.This Standard has been adopted by the ECMA General Assembly o
6、f June 1998.- i -Table of contents1 Scope 12 Normative references 13 Symbols and abbreviations 14 Definitions 24.1 Extension line 24.2 Terminal equipment 24.3 Transceiver 25 PINX extension line reference configuration 25.1 Transceivers 25.2 Transceiver Control Function functional groupings 36 Refere
7、nce points (RP) 36.1 A reference point 36.2 P reference points 36.2.1 P1reference point 36.2.2 Further P reference points 3Annex A - Examples for PTS Functional Groupings and Allocation of Reference 5- ii -.1ScopeThis ECMA Standard specifies a reference configuration (RC) for the extension line of a
8、 private integratedservices network exchange (PINX) including high level functions in addition to the physical terminationsystem specified in part 1 of this Standard.Since such high level functions appear application dependent and can occur, in principle, in any multiplicityand combination, no firm
9、allocation of functional groupings and thus no firm reference points can beindicated. Instead, the principles for combining functional groupings associated with the physical terminationsystem and allocating reference points are specified in this Standard.Examples for some combinations of functional
10、groupings and the allocation of reference points are given inAnnex A.The principles are not intended to require any specific implementation of a PINX, but only to provideguidance for the specification of PINX capabilities.The principles are sufficient to support ISDN-like applications. It can be ext
11、ended to also support non-ISDN-like applications.2 Normative referencesThe following publications contain provisions which, through reference in this text, constitute provisions ofthis Standard. All publications are subject to revision, and parties to agreements based on this Standard areencouraged
12、to investigate the possibility of applying the most recent editions of the publications indicatedbelow.ISO/IEC 11579-1 Information technology - Telecommunications and information exchange betweensystems - Private Integrated Services Network - Part 1: Reference configuration forPISN Exchanges (PINX)
13、(1994)ITU-T Rec. I.411 ISDN user-network interfaces - Reference configurations (1993)ITU-T Rec. I.412 ISDN user-network interfaces - Interface structures and access capabilities (1988)3 Symbols and abbreviationsATM Asynchronous Transfer ModeCBR Constant Bit RateCES Circuit Emulation ServiceCF Contro
14、l FunctionFRP Fixed Radio PartIWF InterWorking FunctionMRP Mobile Radio PartPET Private Exchange TerminationPINX Private Integrated Services Network eXchangePISN Private Integrated Services NetworkPLT Private Line TerminationPNT Private Network TerminationPTS Private Termination SystemRC Reference C
15、onfigurationRP Reference PointSW SWitching- 2 -TA Terminal AdapterTCF Transceicer Control FunctionTcvr TransCeiVeR functional groupingTE Terminal EquipmentTE2 Terminal Equipment type 24 DefinitionsFor the purposes of this Standard, the following definitions apply:4.1 Extension lineThe circuit interc
16、onnecting the terminal equipment with the PINX, thereby bridging the distance betweenthe terminal and the centralized SW function. Depending on implementation, the extension line can be partof the PTS or the PTS can be attached to the extension line at one of its ends.4.2 Terminal equipmentSee ISO/I
17、EC 11579-1.4.3 TransceiverA functional grouping which can perform the reception, amplification, regeneration, multiplexing, de-multiplexing and sending of physical signals presented to it on the extension line.5 PINX extension line reference configurationThe extension line reference configuration fo
18、r a PINX provides for a private termination system (PTS), asspecified in part 1 of this Standard, and may include High Level applications on top of the PTS infra-structure, as appropriate for the functions to be performed on the extension line, see figure 1.SWTE Tcvr 2 Tcvr 1Tcvr nPTSTCF 2 TCF 1A1P1
19、nATCF nSPnA2P2Figure 1 - Extension line reference configuration5.1 TransceiversIn general, the PTS infrastructure consists of a series of transceivers, i.e. functional groupings which canperform reception, amplification, regeneration and sending of physical signals presented to them on theextension
20、line, in either direction of transmission. The number of transceivers can vary from 0 to anysensible number. The transceivers may act in a stand-alone manner or may act as a pair.If multiple instances of transceivers need to be modelled, they shall be interconnected via multipleinstances of P refere
21、nce point, the individual instances being distinguished by appropriate indexes.NOTE 2Examples of the various applications of the reference configuration are given in Annex A.- 3 -5.2 Transceiver Control Function functional groupingsThe individual transceivers can be under the control of transceiver
22、control function functional groupings(TCF).TCFs shall be connected to their corresponding transceivers via an instance of A reference point. Ifmultiple instances of TCFs need to be modelled, each of them shall be connected to its Tcvr via its owninstance of A reference point, the individual instance
23、s being distinguished by appropriate indexes.TCFs can communicate with other TCFs or with high level functions on the TE or on the SW. TCFs cantake a specific name, depending on the particular application they support.Non-TCF High Level entities are outside the scope of this part of this Standard an
24、d are not shown in figure1, but are shown in Annex A for better understanding of the overall context.6 Reference points (RP)A letter has been allocated to that reference point which is the subject to this Standard.6.1 A reference pointThe A reference point defines the boundary between a transceiver
25、functional grouping of the PTS and itsTCF functional grouping.Depending on the implementation, a physical interface can exist at the A reference point. If applicable, itsphysical, electrical and procedural characteristics shall be specified at the A reference point.6.2 P reference points6.2.1 P1refe
26、rence pointThe P1reference point shall define the boundary between the SW and the PTS, or between the SW andthe first TCVR in the PTS, respectivelyIn the case that the PTS functions are NULL, the P1referencepoint will coincide with the S reference point.6.2.2 Further P reference pointsIf applicable,
27、 further P reference points (P2Pn) shall define the boundaries between multipletransceiver functional groupings inside the PTS.Depending on the implementation, a physical interface can exist at any instance of P reference point. Ifapplicable, its physical, electrical and procedural characteristics s
28、hall be specified at that instance of Preference point.- 4 - 5 -Annex A(informative)Examples for PTS Functional Groupings and Allocation of ReferenceExamples for PTS functional groupings are transceivers to support applications on extension lines such as:G01 2-wire/4-wire conversion (basic access on
29、ly)G01 wireless PISN mobility;G01 campus cabling.On a particular implementation of extension line, these applications can exist on their own or they can co-exist invarious combinations.The concept of the extension line reference configuration enables easy concatenation of any number of transceiversi
30、n the PTS, as well as the accommodation of their control functions.For simplicity, the applications described in this annex are described in an isolated way.A.1 2-Wire/4-Wire ConversionFigure A.1 shows an arrangement which provides a 2-wire extension line as a cost efficient means to bridgelarger di
31、stances, compared with the 4-wire cabling in accordance with the standards for a basic access Sinterface of terminal equipment to a PINX.In its lower part figure A1 shows an arrangement of functional groupings which is comparable to that in ITU-T Recommendation I.411 for the ISDN user-to-network acc
32、es.Except for the letter “P” indicating that this is private equipment on an extension line than on the access tothe public ISDN rather, the same functional groupings appear on the access to the PINX, i.e.:G01 a private exchange termination (PET),G01 a private line termination (PLT),G01 a private ne
33、twork termination (PNT).These functional groupings provide the functions similar to the corresponding functional groupings on apublic user access to the ISDN, i.e.G01 to handle extension line related operation and management (non-switching) functions of the PINX;G01 to terminate the PINX to the exte
34、nsion line,G01 to terminate the extension line with regard to the TE.In this example the PLT is assumed to provide a 2-wire interface to the PNT, which it converts to a 4-wireS interface to the TE(s).Extension line related operational and management functions will be executed between the PET and PNT
35、,e.g. the activation of test loops.- 6 -Figure A.1 - 2-wire-to-4-wire conversion on an extension lineA.2 PISN wireless mobilityFigure A.2 shows an example for a specific combination of PTS functional groupings which satisfies therequirements for describing an extension line including the equipment f
36、or wireless mobility.Two cases are depicted:In Case 1 the equipment encompasses a fixed radio station at the wired end of the extension line and awireless handset. This arrangement is known as “wireless end-system”. Strictly, this arrangement does notfall under the scope of this Standard, since all
37、functional groupings needed are beyond the extension line, i.e.in the TE functional grouping. Still case 1 is shown here to illustrate the difference to case 2.In Case 2 the equipment encompasses a fixed radio station at the wired end of the extension line and acomplex mobile part which provides ful
38、l S-bus capability to multiple, ordinary, wired terminals. Thisarrangement is known as “wireless intermediate system”, the best known application of which is the “radiolocal loop”.In case 1 the radio interface appears at a reference point outside the scope of this standard, whereas in case 2the radi
39、o interface appears at an instance of P reference point.Both transceivers require high level functions to perform the typical wireless mobility functions, e.g. pagingfor a desired wireless extension before the actual setup of an incoming call, etc. Also the typical PISN accessfunctions are to be per
40、formed in the fixed radio part functional groupings, e.g. TEI mapping between theMAC_ID at the radio interface and the TEI value obtained from the PINX.For better understanding also a high level function (“Home & Visitors Data Base”) connected to the SW isshown, i.e. the data base and other function
41、s which communicate with the MRP CF and the FRP CF.A1A3 A2TESWTCVR 1TCVR 2TCVR 3TCF 1TCF 2TCF 3P3 P2 P1SPTSTE PETPLTPNT- 7 -Figure A.2 - Application of the extension line reference configuration to PISN wireless mobilityA.3 Campus cablingFigure A.3 shows an example for a specific combination of PTS
42、functional groupings which satisfies therequirements for campus cabling (i.e. cabling on a larger customer premises) where the extension line plant isrun on an ATM backbone network laid out on the campus for various transmission tasks.In this case transceivers convert from different presentations of
43、 the physical signals within the ATM sectionto outside the ATM section. A basic rate narrow-band TE is connected to a PINX via an interworkingfunction providing an ATM circuit emulation service (CES-IWF2). The CES-IWF2 performs the mapping toan ATM CBR channel. At the termination of the ATM connecti
44、on, an ATM CES IWF1 re-maps theinformation into circuit mode and sends it to the PINX.The two ATM CES IWFs therefore virtually extend the CBR link between the TE and the PINX across anintermediate ATM network. Control plane and user information sent by either the TE or the PINX aretransported transp
45、arently through the ATM network. The circuit emulation function preserves bit integrity.A1A2TETETCVR 1TCVR 2TCF 1TCF 2P2 P1SPTSHome & VisitorsData BaseSWFixedRadio PartWirelessHandsetTE2Case 1Case 2TE TATE TCF FRPCFFixedRadio PartMovableRadio PartMRPCFFRPCF- 8 -Figure A.3 - Application of the extens
46、ion line reference configuration to campus cablingA3A4TETCVR 3TCVR 4TCVR 3TCF 4A1A2P5 P4 P3P2P1TCVR 1TCVR 2TCVR 1TCVR 2A5TCVR 5TCF 5SWPTSSTECESIWF2PLT PETCESIWF1PNTATMcircuit modecell modecircuit mode.Printed copies can be ordered from:ECMA114 Rue du RhneCH-1204 GenevaSwitzerlandFax: +41 22 849.60.0
47、1Internet: documentsecma.chFiles can be downloaded from our FTP site, ftp.ecma.ch. This Standard is available from library ECMA-ST as acompacted, self-expanding file in MSWord 6.0 format (file E276-DOC.EXE) and as an Acrobat PDF file (file E276-PDF.PDF). File E276-EXP.TXT gives a short presentation of the Standard.Our web site, http:/www.ecma.ch, gives full information on ECMA, ECMA activities, ECMA Standards andTechnical Reports.ECMA114 Rue du RhneCH-1204 GenevaSwitzerlandThis Standard ECMA-276 is available free of charge in printed form and as a file.See inside cover page for instructions
