1、 Reference number ISO/IEC 18017:2001(E) ISO/IEC 2001INTERNATIONAL STANDARD ISO/IEC 18017 First edition 2001-11-01 Information technology Telecommunications and information exchange between systems Private Integrated Services Network Mapping functions for the employment of Virtual Private Network sce
2、narios Technologies de linformation Tlcommunications et change dinformation entre systmes Rseau priv intgration de services Fonctions de mappage pour lemploi de scnarios de rseau priv virtuel ISO/IEC 18017:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes
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5、as been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2001 All rights reserved. Unless otherwise specified, no part of this publication ma
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7、 + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO/IEC 2001 All rights reserved ISO/IEC 18017:2001(E) ISO/IEC 2001 All rights reserved iiiTable of contents Foreword iv Introduction v 1. Scope 1 2. Conformance 1 3. Normative References 1 4. Te
8、rms and definitions 2 5. List of acronyms 2 6. Access arrangements 3 6.1 Separate access 4 6.2 Shared Access: Common access protocol with call discrimination 4 6.3 Dedicated Access 5 7 Capabilities at the Q reference point 5 8 Mapping functions 6 8.1 Physical Adaptation 6 8.2 Mapping Matrix 6 8.2.1
9、Channel Allocation 6 8.2.2 Bearer Conditioning for the D Q -channel 7 8.2.3 Interface-related Functions 8 Annex A - Implementation Conformance Statement Proforma 9 ISO/IEC 18017:2001(E) iv ISO/IEC 2001 All rights reserved Foreword ISO (the International Organisation for Standardisation) and IEC (the
10、 International Electrotechnical Commission) form the specialised system for world-wide standardisation. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organisation to deal with partic
11、ular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organisations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are drafted in accordance with the rule
12、s given in the ISO/IEC Directives, Part 3. 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 are circulated to national bodies for voting. Publication as an Internati
13、onal Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
14、 rights. International Standard ISO/IEC 18017 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems. Annex A forms a normative part of this International Standard. ISO/IEC 18017:2001(E) ISO/IEC
15、2001 All rights reserved vIntroduction This International Standard is one of a series of PISN mapping standards applicable at the C reference point. Mapping standards specify the assignment of interfaces and the multiplexed physical channel within the interface to B-channels at the Q reference point
16、. Figure 1 shows the relationship of this standard to other mapping standards. ISO/IEC TR 14475 Private Integrated Services network - Architecture and scenarios for Private Integrated Services Networking ISO/IEC 14474 PISN - Mapping Functions for the Employment of Dedicated Circuit Mode Connections
17、as Inter-PTNX Connections ISO/IEC 17309 PISN - Mapping functions for the employment of a Circuit Mode Basic Service and the Supplementary Ser- vice User-to-User Signalling as a pair of On-demand Inter- PINX Connections ISO/IEC 17310 PISN Mapping Functions for the employment of 64 kbit/s Circuit Mode
18、 Connection with 16 kbit/s Sub- multiplexing ISO/IEC 17311 PISN Mapping Functions for the employment of 64 kbit/s Circuit Mode Connection with 8 kbit/s Sub- multiplexing ISO/IEC 18017 PISN - Mapping Functions for the employment of Virtual Private Network Scenarios Bearer Conditioning Standards Beare
19、r Modification Standards Figure 1 - Structure of PISN Scenario and Mapping standards INTERNATIONAL STANDARD ISO/IEC 18017:2001(E) ISO/IEC 2001 All rights reserved 1Information technology Telecommunications and information exchange between systems Private Integrated Services Network Mapping functions
20、 for the employment of Virtual Private Network scenarios 1. Scope This International Standard defines the mapping functions in exchanges of private integrated services networks (PISN) required for their attachment to Virtual Private Network (VPN) functionality of public (or third party provided) net
21、work equipment. Mapping functions are required to provide for the physical termination of the interface at the C or T reference points, and for the mapping of user channels and signalling information flows at the Q reference point to the appropriate channels or time- slots at the C or T reference po
22、int. At the T reference, point it is assumed that the protocol used on the D channel is the enhanced version of DSS1. These protocol enhancements are given in Annex Q and Annex X of Recommendations Q.931 and Q.932 respectively. The mapping function specified in this International Standard are applic
23、able to PINXs connected to a VPN that supports either PISN information flows between accesses and/or PISN services. The C and Q reference points are defined in ISO/IEC 11579-1. The T reference point is defined in ITU-T Rec. I.411. The types of interfaces at the C or T reference point covered by this
24、 International Standard are the ISDN primary rate interface and the basic access interface. 2. Conformance In order to conform to this International Standard, a PINX shall satisfy the requirements identified in the Implementation Conformance Statement (ICS) proforma in Annex A. 3. Normative Referenc
25、es The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this I
26、nternational Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid
27、International Standards. ISO/IEC TR 14475:2001, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Architecture and scenarios for Private Integrated Services Networking ETS 300 415:1994, Private Telecommunication Network (PTN)
28、; Terms and definitions ITU-T Rec. Q.920:1993, Digital Subscriber Signalling System No. 1 (DSS1) - ISDN user-network interface data link layer - General aspects ITU-T Rec. Q.920, Amend 1: 2000, Amendment 1 to ITU-T Recommendation Q.920 ITU-T Rec. Q.921:1997, ISDN user-network interface - Data link l
29、ayer specification ISO/IEC 18017:2001(E) 2 ISO/IEC 2001 All rights reserved ITU-T Rec. Q.921, Amend 1: 2000, Amendment 1 to ITU-T Recommendation Q.921 ITU-T Rec. Q.931:1998, ISDN user-network interface layer 3 specification for basic call control ITU-T Rec. Q.932,1998, Digital subscriber signalling
30、system No. 1 Generic procedures for the control of ISDN supplementary services 4. Terms and definitions For the purpose of this International Standard the terms and definitions given in ETS 300 415 and the following apply. 4.1 reference point: boundary between the Inter-Connecting Network (ICN) and
31、the public ISDN. NOTE - The ICN at this point provides gateway functions such as numbering, charging, management and routing. 4.2 channel: means of bi-directional transmission of user or signalling information between two points. 4.2.1 D Q -Channel: channel used to convey call control information be
32、tween the Q reference points of two peer PINXs. 4.2.2 U Q -Channel: channel used to convey user information between the Q reference points of two peer PINXs. 4.3 Interconnecting Network (ICN): emulation of transit-PINX functionality by equipment that is physically part of the public network, include
33、s one or more IVNs and may include the emulation of gateway-PTNX functionality. 4.4 inter-PINX connection: connection provided by an intervening network (IVN) between two C reference points used to transport inter-PINX information from the PISN control plane and/or the PISN user plane. 4.5 inter-PIN
34、X link: link between the Q reference points of two PINXs, comprising the totality of signalling transfer and user information transfer means. 4.6 T+ reference point: reference point between an Attached PINX and the ICN. NOTE - The interface at the T+ reference point supports private network calls (P
35、ISN) and it may also support public ISDN calls. 4.7 public network equipment: equipment of a public network provider, which is used to provide public network (ISDN) services and virtual private network (VPN) services. NOTE - The term is also used as a synonym to designate equipment of any other thir
36、d party which is used to provide virtual private network (VPN) services only, and which may or may not provide access functions to a public network. 4.8 third party: generic term designating a (legal) body providing VPN services either in conjunction with or without public network services. NOTE - I
37、n the first case the third party is also known as a public network provider. 4.9 Virtual Private Network (VPN): private network transmission and switching functionality emulated by third party provided equipment. NOTE - The functionality provided by a VPN includes transit-PINX functionality and/or e
38、nd-PINX functionality (i.e. it serves the originating or destination user). 4.10 VPN-PINX: that part of a third party provided switched network that provides transit-PINX functionality and/or end- PINX functionality. 4.11 attached PINX: PINX attaching to the VPN. In the context of a call, the attach
39、ed PINX can be an end-PINX (i.e. serving the originating or destination user or acting as a gateway with another network) or it can be a transit- PINX. 5. List of acronyms CSIG C reference point SIGnalling information flows DLCI Data Link Connection Identifier ISO/IEC 18017:2001(E) ISO/IEC 2001 All
40、rights reserved 3ICN InterConnecting Network ICS Implementation Conformance Statement ISDN Integrated Services Digital Network PINX Private Integrated Services Network Exchange PISN Private Integrated Services Network PSS1 Private Signalling System Number 1; commonly known as QSIG QSIG Q reference p
41、oint SIGnalling information flows TSIG T reference point SIGnalling information flows VPN Virtual Private Network 6. Access arrangements In a VPN scenario, a PINX is connected to an access provided by a third party network (normally a public network) that supports, as a minimum, PISN information flo
42、ws and possibly PISN services. The VPN scenarios are described in ISO/IEC TR 14475 and they include the emulation by the third party network of a transit, end or gateway PINX functionality. The access control protocol for the U-channels used to provide PISN services are specified independently of th
43、e interface types provided by the third party network. The mapping of the D-channel and B-channels at the Q reference point to the interfaces and time slots at the access interface (C reference point) are specified in this standard. This International Standard applies to the following Access Arrange
44、ments, which are described in ISO/IEC TR 14475. Table 1 - Access Arrangements No. Description Type of Mapping 1. Separate access: T and C reference points reside on different interfaces Static 2.3 Shared Access: The Protocol Control functions in the network layer supports both TSIG and PSS1 informat
45、ion flows and employs a discrimination function exists to distinguish between ISDN and VPN calls. Dynamic 3. Dedicated Access: All calls are routed via a C reference point as PISN calls. Static NOTE - Shared Accesses Types 2.1 and 2.2 are not included in this standard since there are no standardised
46、 access arrangements that support the required functionality. ITU-T has standardised enhancements to the network nodal interface (NNI) protocol for the support of ISDN services that support the transport of PSS1 information flows. VPNs that implement the IUT-T VPN recommendations are therefore able
47、to the support interoperability between scenarios types 1and 3. ISO/IEC 18017:2001(E) 4 ISO/IEC 2001 All rights reserved PINX PINX PINX C C T+ T+ VPN services PINXFigure 2 - VPN provides interoperability between PINXs attached at either C or T+ reference points 6.1 Separate access The PINX uses a se
48、parate access for PISN calls and public network calls. The type of interface indicates inherently the functions to be invoked for the support of the respective information flows. The mapping of U Q -channels to the channels (time slots) available at the C reference point is static, i.e. time indepen
49、dent. Public network equipment Public ISDN T C mirror like arrangement MP GW Q PINX (see note) IVN MP SW GW C ICN Q CH NOTE: Not all ICNs may provide a gateway to the public network.Figure 3 - VPN access with separate interfaces for public and PISN calls 6.2 Shared Access: Common access protocol with call discrimination A common access control protocol is used for PISN and public calls. In this case, the attached PINX shall support the protocol extensions defined in Annex Q of ITU-T Rec. Q.931 and Annex X
