ECMA 244-2000 Private Integrated Services Network (PISN) - Mapping Functions for the Employment of a Circuit Mode Basic Service and the Supplementary Service User-to-User Signallin.pdf

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1、Standard ECMA-2442nd Edition - September 2000Standardizing 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) -Mapping Functions for theEmployment of a Circuit Mode BasicSe

2、rvice and the SupplementaryService User-to-User Signalling as apair of On-demand Inter-PINXConnections.Standard ECMA-2442nd Edition - September 2000Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chI

3、W Ecma-244.doc 06-09-00 09,22Private Integrated Services Network(PISN) -Mapping Functions for theEmployment of a Circuit Mode BasicService and the SupplementaryService User-to-User Signalling as apair of On-demand Inter-PINXConnections(Mapping/UUS).Brief HistoryThis Standard is one of a series of st

4、andards defining mapping functions in exchanges of Private Integrated ServicesNetworks required for the utilization of intervening network scenarios. The series uses the ISDN concepts asdeveloped by ITU-T (formerly CCITT) and is also within the framework of standards for open systemsinterconnection

5、as defined by ISO/IEC.This particular Standard specifies mapping functions for the type of scenarios where two PINXs are interconnectedvia on-demand connections via the public ISDN using the supplementary service User-to-User Signalling for carryingsignalling information.This Standard is based upon

6、the practical experience 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 nationalstandardization bodies. It represents a pragmatic and widely based consensus.Compared to the 1st Edition of Stand

7、ard ECMA-244 (published by ECMA in June 1996), this 2nd Editionincorporates changes to achieve complete alignment with International Standard ISO/IEC 17309:2000(E) publishedby ISO/IEC in September 2000.Adopted as 2nd Edition of Standard ECMA-244 by the General Assembly in September 2000.- i -Table o

8、f contents1Scope 12 Conformance 13 References (normative) 14 Definitions 24.1 External definitions 24.2 Special definitions 24.2.1 Calling PINX 24.2.2 Called PINX 24.2.3 Channel 24.2.4 Inter-PINX Connection 24.2.5 Inter-PINX Link 25 List of acronyms 26 Introduction 37 Capabilities at the Q reference

9、 point 38 Mapping functions 48.1 Physical adaptation 48.1.1 ISDN primary rate user-network Layer 1 interface (1544 kbit/s) 48.1.2 ISDN primary rate user-network Layer 1 interface (2048 kbit/s) 48.1.3 ISDN basic user-network Layer 1 interface 48.2 Mapping matrix 58.2.1 Channel allocation 58.2.2 Beare

10、r conditioning for the DQ-channel 59 IPC control functions 69.1 IPC establishment 69.2 IPC clearing 610 IPL control functions 610.1 Static pre-conditions for IPL establishment 610.2 IPL establishment 610.3 Transfer of inter-PINX signalling Layer 2 information 610.4 Use of message segmentation 7Annex

11、 A - Implementation Conformance Statement (ICS) Proforma 91ScopeThis Standard specifies the mapping functions for a pair of on-demand inter-PINX connections using a circuitmode basic service and the supplementary service User-to-User Signalling (service 3) of a public ISDN at thesame time.In order t

12、o connect a Private Integrated Services Network Exchange (PINX) to another PINX, mappingfunctions are required to adapt the specific interfaces at the C reference point to the application at the Qreference point. As such, mapping functions provide for physical adaptation to the interface at the C re

13、ferencepoint. Mapping functions also provide for the mapping of user channels and signalling information at the Qreference point to the appropriate channels or timeslots at the C reference point.The C and Q reference points are defined in ECMA-133.At the Q reference point the mappings provide a 64 k

14、bit/s service for user channels and a packet mode servicefor the signalling channel. Bearer conditioning is outside the scope of this Standard, except for providing thelayer 2 for the signalling channel at the Q reference point.Scenario management is outside the scope of this Standard.This Standard

15、is applicable to PINXs which can be interconnected to form a Private Integrated ServicesNetwork (PISN) and which support signalling protocols at the Q reference point.2 ConformanceIn order to conform to this Standard, a PINX shall satisfy the requirements identified in the ImplementationConformance

16、Statement (ICS) proforma in annex A.3 References (normative)The following standards contain provisions which, through reference in this text, constitute provision of thisStandard. All standards are subject to revision, and parties to agreements based on this Standard areencouraged to investigate the

17、 possibility of applying the most recent editions of the standards indicatedbelow.In the case of references to ECMA Standards that are aligned with ISO/IEC International Standards, thenumber of the appropriate ISO/IEC International Standard is given in brackets after the ECMA reference.ECMA-133 Priv

18、ate Integrated Services Network (PISN) - Reference Configuration for PISNExchanges (PINX) (International Standard ISO/IEC 11579-1)ECMA-142 Private Integrated Services Network (PISN) - Circuit Mode 64kbit/s BearerServices - Service Description, Functional Capabilities and Information Flows(Internatio

19、nal Standard ISO/IEC 11574)ECMA-165 Private Integrated Services Network (PISN) - Generic Functional Protocol for theSupport of Supplementary Services - Inter-Exchange Signalling Procedures andProtocol (International Standard ISO/IEC 11582)ETS 300 415 Private Telecommunication Network (PTN); Terms an

20、d definitions (1994)ITU-T Rec. I.112 Vocabulary of terms for ISDNs (1993)ITU-T Rec. I.210 Principles of telecommunication services supported by an ISDN and the means todescribe them (1993)ITU-T Rec. I.411 ISDN user-network interfaces - Reference configurations (1993)ITU-T Rec. I.430 Basic user-netwo

21、rk interface - Layer 1 specification (1995)ITU-T Rec. I.431 Primary rate user-network interface - Layer 1 specification (1993)ITU-T Rec. Q.920 Digital Subscriber Signalling System No. 1 (DSS1) - ISDN user-network interfacedata link layer - General aspects (1993)- 2 -ITU-T Rec. Q.920 Am. 1 Amendment

22、1 to ITU-T Recommendation Q.920 (2000)ITU-T Rec. Q.921 ISDN user-network interface - Data link layer specification (1997)ITU-T Rec. Q.921 Am. 1 Amendment 1 to ITU-T Recommendation Q.921 (2000)ITU-T Rec. Q.931 ISDN user-network interface layer 3 specification for basic call control (1998)ITU-T Rec. Q

23、.957.1 Stage 3 description for additional information transfer supplementary servicesusing DSS 1: User-to-User Signalling (UUS) (1996)4 Definitions4.1 External definitionsFor the purpose of this Standard the following definitions apply: Basic Service (ITU-T Rec. I.210) Call, Basic Call (ECMA-165) In

24、tegrated Services Digital Network (ITU-T Rec. I.112) Private Integrated Services Network (ECMA-133) Private Integrated Services Network Exchange (ECMA-133) Public ISDN (ETS 300 415) Signalling (ITU-T Rec. I.112) Supplementary Service (ECMA-165)4.2 Special definitions4.2.1 Calling PINXThe PINX which

25、is at the originating interface of the public ISDN (IVN).4.2.2 Called PINXThe PINX which is at the destination interface of the public ISDN (IVN).4.2.3 ChannelA means of bi-directional transmission of user or signalling information between two points.4.2.3.1 DQ-ChannelA channel used to convey call c

26、ontrol information between the Q reference points of two peer PINXs.4.2.3.2 UQ-ChannelA channel used to convey user information between the Q reference points of two PINXs.4.2.4 Inter-PINX ConnectionA connection provided by an IVN between two C reference points used to transport inter-PINXinformatio

27、n from the PISN control plane and/or the PISN user plane.4.2.5 Inter-PINX LinkA link between the Q reference points of two PINXs, comprising the totality of signalling transfer anduser information transfer means.5 List of acronymsDSS1 Digital Subscriber Signalling System No. oneICS Implementation Co

28、nformance StatementIPC Inter-PINX ConnectionIPL Inter-PINX Link- 3 -ISDN Integrated Services Digital NetworkIVN Intervening NetworkPINX Private Integrated Services Network ExchangePISN Private Integrated Services NetworkUUS3 User-to-User Signalling service 36 IntroductionThe inter-PINX connection sc

29、enario using circuit mode basic services and the supplementary service User-to-User Signalling service 3 as defined for public ISDNs is an on-demand connection scenario.This scenario creates an IPL from the connections established as a result of an ISDN call. The ISDN call isestablished by specifyin

30、g the supplementary service UUS3. The signalling connection associated with theISDN call in conjunction with the UUS3 information transfer capability is used to provide the inter-PINXsignalling connection. The circuit mode ISDN connection is used to provide the inter-PINX user connection.This scenar

31、io also includes procedures for sequence control and end-to-end flow control.Connections of this scenario can be established and released at any time under the control of either PINX. Incase of failure, the public ISDN may reject a call establishment request or release an already established call.In

32、 case of congestion, the sending PINX may inhibit temporarily the sending of USER INFORMATIONsignalling messages by means of an internal congestion mechanism.Subject to implementation in the public ISDN, this scenario provides for the use of: up to 2 pairs of signalling and user information connecti

33、ons per ISDN basic access; and, up to 23 (1544 kbit/s primary rate) or 30 (2048 kbit/s primary rate) pairs of signalling and user informationconnections per ISDN primary rate access.Multiple pairs of IPCs may exist at one or at more interfaces of a PINX. Each pair of IPCs can convey justone IPL. In

34、the case of multiple pairs of IPCs (at one or more interfaces of a PINX), i.e. several calls withUUS3 are established at the same time from one PINX to one or more other PINXs, there is no mappingcoordination necessary.Provision of just one number for addressing a Called PINX is sufficient for estab

35、lishment of any number ofpairs of IPCs from a given Calling PINX.7 Capabilities at the Q reference pointFor each instance of the Q reference point: one signalling channel (DQ) for carrying the inter-PINX Layer 3 signalling protocol, and one user channel (UQ)are provided.Inter-PINX signalling informa

36、tion is not restricted to call control on this particular UQ-channel.For a UQ-channel the following bearer capability shall be provided: information transfer rate: 64 kbit/s; other attributes shall be the same as at the C reference point.NOTEThe provision of bearer conditioning can change these attr

37、ibutes. However, this is outside the scope of thisStandard.For a DQ-channel the following bearer capability shall be provided: Transfer mode: packet mode; Information transfer capability: unrestricted digital information;- 4 - Information transfer rate: implementation-dependent; Other attributes sha

38、ll be the same as at the C reference point.The functions to map DQand UQchannels to an inter-PINX connection (IPC) at the C reference point aredescribed in clause 8.8 Mapping functionsThe PINX mapping functions shall meet the requirements defined for physical adaptation (8.1), channelallocation (8.2

39、.1) and bearer conditioning for the DQ-channel (8.2.2).8.1 Physical adaptationA PINX shall support at least one of the following physical adaptations.8.1.1 ISDN primary rate user-network Layer 1 interface (1544 kbit/s)Layer 1 termination for the 1544 kbit/s primary rate interface shall be in accorda

40、nce with ITU-T Rec.I.431.Timeslots 1 to 23 shall be used for up to 23 circuit mode 64 kbit/s IPCs for user information. Timeslot24 (D-channel) carries signalling information for establishing and clearing the circuit mode 64 kbit/sIPCs and providing, for each one, a packet mode IPC for inter-PINX sig

41、nalling information through theuse of UUS3.NOTEUUS3 provides a packet mode service by virtue of allowing the transfer of User-to-User information inUSER INFORMATION messages using the call reference of the circuit mode 64 kbit/s IPC. The circuitmode 64 kbit/s IPC will in general have different call

42、references at the calling and called interfaces.The Layer 2 protocol in timeslot 24 at the C reference point shall conform to: ITU-T Recs. Q.920 / Q.921 (Data link).The Layer 3 protocol in timeslot 24 at the C reference point shall conform to: ITU-T Rec. Q.931 (Basic Call control) and ITU-T Rec. Q.9

43、57.1 (User-to-User Signalling supplementary service).8.1.2 ISDN primary rate user-network Layer 1 interface (2048 kbit/s)Layer 1 termination for the 2048 kbit/s primary rate interface shall be in accordance with ITU-T Rec.I.431.Timeslots 1 to 15 and 17 to 31 shall be used for up to 30 circuit mode 6

44、4 kbit/s IPCs for userinformation. Timeslot 16 (D-channel) carries signalling information for establishing and clearing thecircuit mode 64 kbit/s IPCs and providing, for each one, a packet mode IPC for inter-PINX signallinginformation through the use of UUS3.NOTEUUS3 provides a packet mode service b

45、y virtue of allowing the transfer of User-to-User information inUSER INFORMATION messages using the call reference of the circuit mode 64 kbit/s IPC. The circuitmode 64 kbit/s IPC will in general have different call references at the calling and called interfaces.The Layer 2 protocol in timeslot 16

46、at the C reference point shall conform to: ITU-T Recs. Q.920 / Q.921 (Data link).The Layer 3 protocol in timeslot 16 at the C reference point shall conform to: ITU-T Rec. Q.931 (Basic Call control) and ITU-T Rec. Q.957.1 (User-to-User Signalling supplementary service).8.1.3 ISDN basic user-network L

47、ayer 1 interfaceLayer 1 termination shall be in accordance with ITU-T Rec. I.430, excluding application of the point-to-multipoint mode of operation.- 5 -B-channels B1 and B2 of the interface shall be used for up to two circuit mode 64 kbit/s IPCs for userinformation. The D-channel of the interface

48、carries signalling information for establishing and clearingthe circuit mode 64 kbit/s IPCs and providing, for each one, a packet mode IPC for inter-PINXsignalling information through the use of UUS3.NOTEUUS3 provides a packet mode service by virtue of allowing the transfer of User-to-User informati

49、on inUSER INFORMATION messages using the call reference of the circuit mode 64 kbit/s IPC. The circuitmode 64 kbit/s IPC will in general have different call references at the calling and called interfaces.The Layer 2 protocol in the D-channel at the C reference point shall conform to: ITU-T Recs. Q.920 / Q.921 (Data link).The Layer 3 protocol in the D-channel at the C reference point shall conform to: ITU-T Rec. Q.931 (Basic Call control) and ITU-T Rec. Q.957.1 (User-to-User Signalling supplementary service).8.2 Mapping matrixThe mapping matrix provides for th