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1、BRITISH STANDARD BS ISO/IEC 13246:1997 Information technology Telecommunications and information exchange between systems Broadband Private Integrated Services Network Inter-exchange signalling protocol Signalling ATM adaptation layer ICS 33.040.40;35.110 Licensed Copy: sheffieldun sheffieldun, na,
2、Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Board and comes into effect on 15 February 1998 BSI 04-1999 ISBN 0 580 29266 5 Na
3、tional foreword This British Standard reproduces verbatim ISO/IEC 13246:1997 and implements it as the UK national standard. 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;
4、present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, 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 c
5、an be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain
6、 identifiers from both systems. Cross-references The British Standards which implement international or European publications 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” fac
7、ility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions 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 oblig
8、ations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO/IEC title page, pages ii to iv, pages 1 to 17 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the a
9、mendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 BSI 04-1999i Contents Page National forewordInside front cover Forewordi
10、ii Text of ISO/IEC 132461 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Tue Nov
11、 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 ii BSI 04-1999 Contents Page Forewordiii Introduction1 1Scope1 2Conformance1 3Normative References1 4Definitions1 5List of Acronyms1 6Description2 6.1Common Part AAL Type 52 6.2SSCOP2 6.3SSCF for Broadband Inter-PINX Signa
12、lling2 7Operational Requirements2 7.1B-QSIG SAAL Connections2 7.2Traffic Management Method for B-QSIG SAAL Connections2 8B-QSIG SAAL Specification2 8.1Basic Structure2 8.2AAL Type 52 8.3SSCOP2 8.4SSCF for Broadband Inter-PINX Signaling3 Annex A (normative) Protocol Implementation Conformance Stateme
13、nt (PICS) proforma for B-QSIG SAAL5 Annex B (informative) Relationship to corresponding ITU-T Recommendations for public B-ISDN UNIs12 Annex C (informative) Protocol data unit and related primitive sequences for establishment and release of B-QSIG SAAL connections13 Figure 1 B-QSIG SAAL Structure3 T
14、able A.114 Table A.215 Table A.315 Table A.416 Descriptors: Data processing, information interchange, telecommunications, telecommunication network, network interconnection, data transmission, private network, ISDN, signal processing, services, protocols. Licensed Copy: sheffieldun sheffieldun, na,
15、Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 BSI 04-1999iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies tha
16、t are members of ISO or IEC participate 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 interna
17、tional organizations, governmental 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 JTC 1. Draft International Standards adopted by the joint technical committee ar
18、e circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 13246 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Tele
19、communications and information exchange between systems. Annex A forms an integral part of this International Standard. Annex B and Annex C are for information only. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: she
20、ffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 BSI 04-19991 Introduction This International Standard is one of a series of International Standards defining services and signalling protocols applicable to Broadband Private Integrated Ser
21、vices 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 Signalling ATM Adaptation Layer (SAAL) protocol for us
22、e 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 the B-QSIG signalling system protocol family. The B-QSIG SAAL
23、uses the functions provided by the ATM layer, and provides the services required by the B-QSIG Layer 3 signalling protocols. 2 Conformance In order to conform to this International Standard, a PINX shall satisfy requirements identified in the Protocol Implementation Conformance Statement (PICS) in A
24、nnex 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 subject to revision, and parties to agreements based
25、 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/IEC 9646-1:1994, Information technology Open Systems Intercon
26、nection Conformance testing methodology and framework Part 1: General concepts. ISO/IEC 9646-7:1995, Information technology Open Systems Interconnection Conformance testing methodology and framework Part 7: Implementation Conformance Statements. ITU-T Rec. I.321 (1991), B-ISDN Protocol Reference Mod
27、el 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 Part 5: AAL Type 5. ITU-T Rec. I.371 (1996), Traffic control
28、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 Signalling ATM Adaptation Layer Servi
29、ce 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 Recommendations I.363.5, Q.2110 and Q.2130 apply. 5 List of Acronyms AALATM Adaptation Layer ATMAs
30、ynchronous Transfer Mode B-ISDNBroadband ISDN B-PISNBroadband Private Integrated Service Network B-PINXB-PISN Exchange B-QSIGBroadband QSIG CRCCyclic Redundancy Check IPLInter-PINX-Link PICSProtocol Implementation Conformance Statement PINXPrivate Services Network eXchange SAALSignalling AAL SDUServ
31、ice Data Unit SPCSemi-Permanent Connection SSCFService Specific Convergence Functions SSCOPService Specific Connection Oriented Protocol UBRUnspecified Bit Rate UNIUser Network Interface Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO
32、/IEC 13246:1997 2 BSI 04-1999 6 Description The SAAL protocol for Broadband Inter-PINX signalling uses the services of the ATM layer and provides the services required by the B-QSIG Layer 3 signalling protocols. It is based on the generic framework outlined by Recommendations I.362 for the functiona
33、l description of the AAL, and Q.2100 for the signalling AAL specification. The B-QSIG SAAL allows a B-QSIG SAAL user (i.e. a layer 3 signalling protocol) to communicate with its peer entity. In particular, it provides for a reliable transfer of layer 3 signalling messages. The information transfer b
34、etween the B-QSIG SAAL user and the B-QSIG SAAL uses primitives and 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 u
35、nassured operation is not required by the B-QSIG layer 3 signalling 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 Type 5. 6.1 Common Part
36、 AAL Type 5 AAL Type 5 provides transparent transfer and CRC checking (32 Bits) 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 ent
37、ities. 6.3 SSCF for Broadband Inter-PINX Signalling SSCF maps the particular requirements of the Broadband Inter-PINX layer 3 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
38、(the method for making this information available for both peer entities is 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
39、SAAL operates in a connection-oriented mode. The B-QSIG SAAL connection(s) 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 Manage
40、ment Method for B-QSIG SAAL Connections For the operation of the B-QSIG SAAL 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 a
41、re examples of parameters that can be pre-configured (see also ITU-T Rec. I.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 tra
42、ffic resources allocated to the B-QSIG SAAL connection is outside the scope 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
43、 Structure Clause 5 of ITU-T Rec. Q.2100 applies. 8.2 AAL Type 5 ITU-T Rec. 1.363.5 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
44、 mandatory functions for a general protocol. Some of these functions are not needed 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
45、not needed within B-QSIG SAAL), provided that the SSCOP implementation provides for the services used by the B-QSIG SAAL-SSCF. A fully compliant SSCOP implementation according to ITU-T Rec. Q.2110 meets the requirements for the SSCOP of this International Standard. Licensed Copy: sheffieldun sheffie
46、ldun, na, Tue Nov 21 08:52:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 13246:1997 BSI 04-19993 8.4 SSCF for Broadband Inter-PINX Signalling 8.4.1 SAAL Services Provided by the SSCF for B-QSIG Signalling The following services shall be provided. Unless specified differently, they shall b
47、e provided as specified in clause 5 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 a default, it supports the transfer of octet-aligned SDUs up to a maximum of 4 096 octets. establishment a
48、nd 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, the SSCF may release B-QSIG SAAL connections to recover from error situations. The following SAAL service
49、s may optionally be provided: unacknowledged transfer of data. The use of this service is not specified by the B-QSIG layer 3 signalling protocol. 8.4.2 Functions of the SSCF and Signalling Protocol Stack Clause 6 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 clause 6/Q.2130. 8.4.3 Definition of the Boundary of SSCF to B-QSIG-Layer 3 Protocols Clause 7 of ITU-T Re
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