BS ISO IEC 13246-1998 Information technology - Telecommunications and information exchange between systems - Broadband private integrated services network - Inter-exchange.pdf

1、BRITISH STANDARD BS ISO/IEC 13246:1997 Information technology Telecommunications and information exchange between systems BroadbandPrivate Integrated Services Network Inter-exchange signalling protocol Signalling ATM adaptation layer ICS33.040.40;35.110BSISO/IEC 13246:1997 This British Standard, hav

2、ing been prepared under the directionof the DISC Board, waspublished under the authorityof the Standards Boardand comes into effect on 15February 1998 BSI 04-1999 ISBN 0 580 29266 5 National foreword This British Standard reproduces verbatim ISO/IEC13246:1997 and implements it as the UK national sta

3、ndard. The UK participation in its preparation was entrusted to Technical Committee IST/6, Data communications, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for cha

4、nge, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From1 January1997, all IEC publications have the number60000 added to the

5、 old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publicati

6、ons referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisio

7、ns of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO/IECtitle pag

8、e, pages ii to iv, pages1 to17 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO/IEC 13246:1997 BSI 0

9、4-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO/IEC13246 1ii blankBSISO/IEC 13246:1997 ii BSI 04-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Conformance 1 3 Normative References 1 4 Definitions 1 5 List of Acronyms 1 6 Description 2 6.1 Common Part

10、 AAL Type5 2 6.2 SSCOP 2 6.3 SSCF for Broadband Inter-PINX Signalling 2 7 Operational Requirements 2 7.1 B-QSIG SAAL Connections 2 7.2 Traffic Management Method for B-QSIG SAAL Connections 2 8 B-QSIG SAAL Specification 2 8.1 Basic Structure 2 8.2 AAL Type5 2 8.3 SSCOP 2 8.4 SSCF for Broadband Inter-

11、PINX Signaling 3 Annex A (normative) Protocol Implementation Conformance Statement (PICS) proforma for B-QSIG SAAL 5 Annex B (informative) Relationship to corresponding ITU-T Recommendationsforpublic B-ISDN UNIs 12 Annex C (informative) Protocol data unit and related primitive sequences forestablish

12、ment and release of B-QSIG SAAL connections 13 Figure 1 B-QSIG SAAL Structure 3 Table A.1 14 Table A.2 15 Table A.3 15 Table A.4 16 Descriptors: Data processing, information interchange, telecommunications, telecommunication network, network interconnection, data transmission, private network, ISDN,

13、 signal processing, services, protocols.BSISO/IEC13246:1997 BSI 04-1999 iii Foreword ISO (the International Organization for Standardization) and IEC (theInternational Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or I

14、ECparticipate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, gove

15、rnmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC1. Draft International Standards adopted by the joint technical committee are circulated to national bo

16、dies for voting. Publication as an International Standard requires approval by at least75% of the national bodies casting a vote. International Standard ISO/IEC13246 was prepared by Joint Technical Committee ISO/IEC JTC1, Information technology, Subcommittee SC6, Telecommunications and information e

17、xchange between systems. Annex A forms an integral part of this International Standard. Annex B and Annex C are for information only.iv blankBSISO/IEC13246:1997 BSI 04-1999 1 Introduction This International Standard is one of a series of International Standards defining services and signalling proto

18、cols applicable to Broadband Private Integrated Services Networks (B-PISNs). The series uses B-ISDN concepts as developed by ITU-T and conforms to the framework of International Standards for Open Systems Interconnection as defined by ISO/IEC. This particular International Standard specifies the Sig

19、nalling ATM Adaptation Layer (SAAL) protocol for use at the Q reference point (B-QSIG SAAL). 1 Scope This International Standard specifies the signalling ATM adaptation layer (SAAL) protocol used at the interface between Broadband PINXs and between Broadband PISNs within the framework of theB-QSIG s

20、ignalling system protocol family. The B-QSIG SAAL uses the functions provided by the ATM layer, and provides the services required by the B-QSIG Layer3 signalling protocols. 2 Conformance In order to conform to this International Standard, a PINX shall satisfy requirements identified in the Protocol

21、 Implementation Conformance Statement (PICS) in Annex A. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are sub

22、ject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO/IEC9646-1:19

23、94, Information technology Open Systems Interconnection Conformance testing methodology and framework Part1:General concepts. ISO/IEC9646-7:1995, Information technology Open Systems Interconnection Conformance testing methodology and framework Part7:Implementation Conformance Statements. ITU-T Rec.I

24、.321 (1991), B-ISDN Protocol Reference Model and Its Application. ITU-T Rec.I.361 (1993), B-ISDN ATM Layer Specification. ITU-T Rec.I.362 (1993), B-ISDN ATM Adaptation Layer (AAL) Functional Description. ITU-T Rec.I.363.5 (1996), B-ISDN ATM Adaptation Layer (AAL) Specification Part5:AAL Type5. ITU-T

25、 Rec.I.371 (1996), Traffic control and congestion control in B-ISDN. ITU-T Rec. Q.2100 (1994), B-ISDN Signalling ATM Adaptation Layer Overview Description. ITU-T Rec. Q.2110 (1994), B-ISDN ATM Adaptation Layer Service Specific Connection Oriented Protocol (SSCOP). ITU-T Rec. Q.2130 (1994), B-ISDN Si

26、gnalling ATM Adaptation Layer Service Specific Coordination Function for Support of Signalling at the User-to-Network Interface (SSCF at UNI). 4 Definitions For the purposes of this International Standard, the definitions given in ITU-T RecommendationsI.363.5, Q.2110 andQ.2130apply. 5 List of Acrony

27、ms AAL ATM Adaptation Layer ATM Asynchronous Transfer Mode B-ISDN Broadband ISDN B-PISN Broadband Private Integrated Service Network B-PINX B-PISN Exchange B-QSIG Broadband QSIG CRC Cyclic Redundancy Check IPL Inter-PINX-Link PICS Protocol Implementation Conformance Statement PINX Private Services N

28、etwork eXchange SAAL Signalling AAL SDU Service Data Unit SPC Semi-Permanent Connection SSCF Service Specific Convergence Functions SSCOP Service Specific Connection Oriented Protocol UBR Unspecified Bit Rate UNI User Network InterfaceBSISO/IEC 13246:1997 2 BSI 04-1999 6 Description The SAAL protoco

29、l for Broadband Inter-PINX signalling uses the services of the ATM layer and provides the services required by the B-QSIG Layer3 signalling protocols. It is based on the generic framework outlined by RecommendationsI.362 for the functional description of the AAL, and Q.2100for the signalling AAL spe

30、cification. The B-QSIG SAAL allows a B-QSIG SAAL user (i.e.a layer3 signalling protocol) to communicate with its peer entity. In particular, it provides for a reliable transfer of layer3 signalling messages. The information transfer between the B-QSIG SAAL user and the B-QSIG SAAL uses primitives an

31、d is performed in Message Mode. Two peer-to-peer operational procedures are specified: Unassured or Assured operation. The support of the Assured operation is mandatory. The support of Unassured operation is optional. NOTEThe use of unassured operation is not required by the B-QSIG layer3 signalling

32、 protocol. The basic structure of the B-QSIG SAAL is contained in Figure 1. For the B-QSIG SAAL,3 sublayers are defined similar to those shown in Figure 1 of Rec. Q.2100: SSCF for B-QSIG SSCOP Common Part AAL Type5. 6.1 Common Part AAL Type5 AAL Type5 provides transparent transfer and CRC checking(3

33、2Bits) for SSCOP SDUs, segmentation into ATM cells, and reassembly. 6.2 SSCOP SSCOP provides the basic mechanisms for the establishment and release of connections and the reliable exchange of information between B-PINX peer entities. 6.3 SSCF for Broadband Inter-PINX Signalling SSCF maps the particu

34、lar requirements of the Broadband Inter-PINX layer3 signalling protocols to the SSCOP services. 7 Operational Requirements B-QSIG SAAL requires that the following configuration information is available at both sides of an IPL (the method for making this information available for both peer entities i

35、s outside the scope of this International Standard): which virtual channel acts as the signalling channels for the IPL which traffic management method is applied on that virtual channel. 7.1 B-QSIG SAAL Connections The B-QSIG SAAL operates in a connection-oriented mode. The B-QSIG SAAL connection(s)

36、 shall be established as part of the IPL establishment, and shall reside permanently (except for error cases). NOTEB-QSIG SAAL connections are established between two peer entities at the two ends of an IPL. 7.2 Traffic Management Method for B-QSIG SAAL Connections For the operation of the B-QSIG SA

37、AL protocol, the peer entities at two ends of an IPL shall be pre-configured with the traffic resources allocated to the B-QSIG SAAL connections. For each B-QSIG SAAL connection (or for a set of them together), the following are examples of parameters that can be pre-configured (see also ITU-T Rec.I

38、.371): a) a peak cell rate indication (only), e.g.167 cells/sec. b) peak cell rate, sustainable cell rate, and maximum burst size (together) c) an indication as “unspecified bit rate” (UBR). The method of configuring the traffic resources allocated to the B-QSIG SAAL connection is outside the scope

39、of this International Standard. However, it is essential for the traffic management of B-QSIG SAAL connections that both peer entities at the IPL apply the same allocation of parameters. 8 B-QSIG SAAL Specification 8.1 Basic Structure Clause5 of ITU-T Rec. Q.2100applies. 8.2 AAL Type5 ITU-T Rec.1.36

40、3.5 applies. 8.3 SSCOP ITU-T Rec. Q.2110 applies. NOTEThe SSCOP can be combined with different Service Specific Coordination Functions (SSCFs) to offer different AAL services. As a result, the SSCOP specification defines mandatory functions for a general protocol. Some of these functions are not nee

41、ded within B-QSIG SAAL. Therefore, it is possible for an implementation not to implement a certain SSCOP function and still meet the mandatory requirements of B-QSIG SAAL (e.g.the SSCOP local data retrieval function is not needed within B-QSIG SAAL), provided that the SSCOP implementation provides f

42、or the services used by the B-QSIG SAAL-SSCF. A fully compliant SSCOP implementation according to ITU-T Rec. Q.2110meets the requirements for the SSCOP of this International Standard.BSISO/IEC13246:1997 BSI 04-1999 3 8.4 SSCF for Broadband Inter-PINX Signalling 8.4.1 SAAL Services Provided by the SS

43、CF forB-QSIG Signalling The following services shall be provided. Unless specified differently, they shall be provided as specified in clause5 of ITU-T Rec. Q.2130: assured transfer of data. transparency of transferred information. NOTEThe SSCF does not interpret the structure or meaning of SDUs; as

44、 a default, it supports the transfer of octet-aligned SDUs up to a maximum of4096 octets. establishment and release of B-QSIG SAAL connections for assured transfer of data. B-QSIG SAAL connections are established during IPL establishment, and reside permanently. However, in certain error scenarios,

45、the SSCF may release B-QSIG SAAL connections to recover from error situations. The following SAAL services may optionally be provided: unacknowledged transfer of data. The use of this service is not specified by the B-QSIG layer3 signalling protocol. 8.4.2 Functions of the SSCF and Signalling Protoc

46、ol Stack Clause6 of ITU-T Rec. Q.2130 applies with the following exception: only point-to-point B-QSIG SAAL connections shall be supported. In particular, B-QSIG SAAL shall not provide the broadcast capability described in clause6/Q.2130. 8.4.3 Definition of the Boundary of SSCF to B-QSIG-Layer3 Pro

47、tocols Clause7 of ITU-T Rec. Q.2130 applies with the following exceptions: The support of the AAL-UNITDATA primitive is not mandatory. The use of this primitive is not specified by B-QSIG layer3 signalling protocol. The support of layer3 peer-to-peer messages in the AAL-ESTABLISH and AAL-RELEASE pri

48、mitives is not mandatory. The use of those parameter data in these primitives is not specified by the B-QSIG layer3 signalling protocol. 8.4.4 Definition of the Boundary of SSCF with SSCOP Clause8 of ITU-T Rec. Q.2130 applies with the following exception: The support of the AA-UNITDATA primitive is

49、not mandatory. 8.4.5 State Transition Table of SSCF for Supporting B-QSIG Signalling Clause9 of ITU-T Rec. Q.2130 applies with the exceptions specified in sections8.4.3 and8.4.4 above. 8.4.6 Boundary to Layer Management No requirements have been identified. 8.4.7 Applicability of SSCOP Parameters and Timers to B-QSIG Signalling The values specified in Table 4 of ITU-TRec. Q.2130 are used as default parameters. Figure 1 B-QSIG SAAL StructureBSISO/IEC 13246:1997 4 BSI 04-1999 However, parameter and timer values at th