ISO IEC 17311-2000 Information technology - Telecommunications and information exchange between systems Private integrated Services Network - Mapping functions .pdf

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1、Reference number ISO/IEC 17311:2000(E) ISO/IEC 2000 INTERNATIONAL STANDARD ISO/IEC 17311 First edition 2000-09-15 Information technology Telecommunications and information exchange between systems Private Integrated Services Network Mapping functions for the employment of 64 kbit/s circuit mode conn

2、ections with 8 kbit/s sub-multiplexing Technologies de linformation Tlcommunications et change dinformation entre systmes Rseau priv avec intgration de services Fonctions dapplication pour lemploi de connexions en mode circuit de 64 kbits/s avec sous-multiplexage de 8 kbits/sISO/IEC 17311:2000(E) PD

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5、e to the file; the PDF-creation parameters were optimized for printing. Every care has 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

6、2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the c

7、ountry of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 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 2000 All rights reservedISO/IEC 17311:2000(E) ISO/IEC 2000 All rights reserved iii Contents Forewordiv

8、Introduction v 1 Scope1 2 Conformance 1 3 Normative references .1 4 Definitions2 4.1 External definitions 2 4.2 Special definitions2 4.2.1 Channel . 2 4.2.2 End PINX 2 4.2.3 Inter-PINX Connection .2 4.2.4 Inter-PINX Link 2 4.2.5 Transit PINX .2 5 Abbreviations .2 6 Introduction 2 7 Capabilities at t

9、he Q reference point 3 8 Mapping functions3 8.1 Physical adaptation.3 8.1.1 64 kbit/s Unrestricted Digital Leased Line (D64U) .3 8.2 Mapping Matrix4 8.2.1 Channel allocation4 8.2.2 Bearer Conditioning for the D Q -channel .4 8.2.3 Bearer Conditioning for the U Q -channels4 Annexes A Implementation C

10、onformance Statement (ICS) Proforma.5 B Bibliography 8 C QSIG Protocol Codepoints 9 D Example figure for Bearer Conditioning of U Q -channels .10ISO/IEC 17311:2000(E) iv ISO/IEC 2000 All rights reserved Foreword ISO (the International Organization for Standardization) and IEC (the International Elec

11、trotechnical Commission) form the specialized system for worldwide standardization. National bodies that 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 techn

12、ical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are drafted in accordance with the rules given in the ISO/I

13、EC 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 International Standard requir

14、es 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 rights. Internation

15、al Standard ISO/IEC 17311 was prepared by ECMA (as ECMA-289) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO and IEC. Annex A forms a normative part of this Internatio

16、nal Standard. Annexes B, C and D are for information only.ISO/IEC 17311:2000(E) ISO/IEC 2000 All rights reserved v Introduction This International Standard is one of a series of standards defining mapping functions in exchanges of Private Integrated Services Networks. The series uses the ISDN concep

17、ts as developed by ITU-T (formerly CCITT) and is also within the framework of standards for open systems interconnection as defined by ISO/IEC. This International Standard specifies mapping functions for the type of scenario where two PINXs are interconnected via a 64 kbit/s circuit mode connection

18、with 8 kbit/s sub-multiplexing. This International Standard is based upon the practical experience of ECMA member companies and the results of their active and continuous participation in the work of ISO/IEC JTC 1, ITU-T, ETSI and other international and national standardization bodies. It represent

19、s a pragmatic and widely based consensus.INTERNATIONAL STANDARD ISO/IEC 17311:2000(E) ISO/IEC 2000 All rights reserved 1 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Mapping functions for the employment of 64 kbit/s circ

20、uit mode connections with 8 kbit/s sub-multiplexing 1S c o p e This International Standard defines the mapping functions in exchanges of Private Integrated Services Networks (PISNs) required for the utilization of scenarios in which 64 kbit/s circuit mode connections are sub-multiplexed into one 16

21、kbit/s channel for carrying inter-PINX signalling and 6 x 8 kbit/s channels for carrying inter-PINX user information. NOTE 1 - This International Standard has been prepared to meet the specific needs of an application for a particular user organisation. However, it may also be applicable elsewhere.

22、In order to connect a Private Integrated Services Network Exchange (PINX) to another PINX, mapping functions are required to adapt the specific interfaces at the C reference point to the application at the Q reference point. As such, mapping functions provide for physical adaptation to the interface

23、 at the C reference point. Mapping functions also provide for the mapping of user channels and signalling information at the Q reference point to the appropriate channels or timeslots at the C reference point. The C and Q reference points are defined in ISO/IEC 11579-1. The type of interface at the

24、C reference point covered by this International Standard is the 64 kbit/s Unrestricted Digital Leased Line (D64U) Terminal Equipment Interface, in accordance with ITU-T Rec. G.703. At the Q reference point the mapping provides an 8 kbit/s service for user channels to support the transfer of unrestri

25、cted digital information and to support the transfer of speech, and a 16 kbit/s packet mode service for the signalling channel. The applied mapping is a static mapping, i.e. there is a fixed relationship between user and signalling channels at the Q reference point and the interface at the C referen

26、ce point. Management functions relating to failure management are outside the scope of this International Standard. This International Standard is applicable to PINXs that can be interconnected to form a Private Integrated Services Network (PISN) and that support signalling protocols at the Q refere

27、nce point. 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 references The following normative documents contain provisions which, through reference in

28、 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 International Standard are encouraged to investigate the possibility of applying the

29、 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 International Standards. ISO/IEC 11579-1:1994, Information technology Telecommunica

30、tions and information exchange between systems Private Integrated Services Network - Part 1: Reference configuration for PISN exchanges (PINX). ITU-T Rec. G.703:1998, Physical / electrical characteristics of hierarchical digital interfaces. ITU-T Rec. Q.920:1993, Digital Subscriber Signalling System

31、 No. 1 (DSS1) ISDN user-network interface data link layer General aspects. ITU-T Rec. Q.920 Am. 1:2000, Amendment 1 to ITU-T Recommendation Q.920. ITU-T Rec. Q.921:1997, ISDN user-network interface Data link layer specification. ITU-T Rec. Q.921 Am. 1:2000, Amendment 1 to ITU-T Recommendation Q.921.

32、ISO/IEC 17311:2000(E) 2 ISO/IEC 2000 All rights reserved ITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs. ITU-T Rec. I.460:1999, Multiplexing, rate adaption and support of existing interfaces. NOTE 2 - This International Standard also contains informative references. Details of these publicatio

33、ns are given in annex B. 4 Definitions 4.1 External definitions For the purposes of this International Standard, the following external definitions apply. Integrated Services Digital Network (CCITT Rec. I.112) Private Integrated Services Network (ISO/IEC 11579-1) Private Integrated Services Network

34、Exchange (ISO/IEC 11579-1) 4.2 Special definitions 4.2.1 Channel : A means of bi-directional transmission of user or signalling information between two points. 4.2.1.1 D Q -Channel : A channel used to convey call control information between the Q reference points of two peer PINXs. 4.2.1.2 U Q -Chan

35、nel : A channel used to convey user information between the Q reference points of two PINXs. 4.2.2 End PINX : In the context of a particular call, a PINX to which one of the users is attached (Originating PINX or Terminating PINX) or a PINX at which signalling interworking occurs (Gateway PINX). 4.2

36、.3 Inter-PINX Connection : A connection provided by an IVN between two C reference points used to transport inter- PINX information from the PISN control plane and/or the PISN user plane. 4.2.4 Inter-PINX Link : A link between the Q reference points of two PINXs, comprising the totality of signallin

37、g transfer and user information transfer means. 4.2.5 Transit PINX : In the context of a particular call, any PINX, excluding the End PINXs, through which the call passes. 5 Abbreviations ICS Implementation Conformance Statement IPC Inter-PINX Connection IPL Inter-PINX Link ISDN Integrated Services

38、Digital Network MP MaPping functional grouping PINX Private Integrated Services Network Exchange PISN Private Integrated Services Network 6 Introduction This International Standard specifies mapping functions for the following scenario: Dedicated 64 kbit/s circuit mode connection sub-multiplexed to

39、provide 8 kbit/s user information channels. This scenario consists of a dedicated 64 kbit/s circuit mode connection in a point-to-point configuration, and offering at the C reference point an interface with a single 64 kbit/s channel. This 64 kbit/s channel is sub-multiplexed by the Mapping (MP) fun

40、ctional grouping into one 16 kbit/s signalling channel and 6 x 8 kbit/s user information channels. NOTE 3 - Where a user information channel is used for carrying speech, a speech compression function is required. This is provided by the Switching (SW) functional grouping.ISO/IEC 17311:2000(E) ISO/IE

41、C 2000 All rights reserved 3 The applied mapping is a static mapping. There is a fixed relationship between user and signalling channels at the Q reference point and the interface at the C reference point. Administrative actions to apply the mapping are necessary at both sides of an IPL. At the C re

42、ference point more than one instance of the interface type may exist. NOTE 4 - For more information refer to ECMA TR/76 clause 7. 7 Capabilities at the Q reference point For each instance of the Q reference point: 6 user channels (U Q ); and 1 signalling channel (D Q ) for carrying the inter-PINX la

43、yer 3 signalling protocol are provided. The user channels are numbered 16. For a U Q -channel the following bearer capabilities shall be provided: information transfer rate: 8 kbit/s information transfer capability: speech, or unrestricted digital information user information layer 1 protocol: See n

44、otes 5 and 6 below. Other attributes shall be the same as at the C reference point. NOTE 5 - In the case where the information transfer capability indicates “speech“, the user information layer 1 protocol attribute indicates the speech encoding algorithm in use (e.g., GSM 06.90 AMR-CELP, ITU-T Rec.

45、G.723.1 A/MP-MLQ CELP, ITU-T Rec. G.729 CS- ACELP, etc.). However, since speech encoding is performed by the Switching (SW) functional grouping and not by the Mapping (MP) functional grouping (see annex D), the specification of the speech encoding algorithm to be used is outside the scope of this In

46、ternational Standard. See also annex C. NOTE 6 - In the case where the information transfer capability indicates “unrestricted digital information“, no user information layer 1 protocol is indicated; it is an end-to-end matter between terminal equipments attached to a PISN. For a D Q -channel the fo

47、llowing bearer capability shall be provided: Transfer mode: packet mode Information transfer capability: unrestricted digital information Information transfer rate: 16 kbit/s Other attributes shall be the same as at the C reference point. The functions to map D Q and U Q channels to an inter-PINX co

48、nnection (IPC) at the C reference point are described in clause 8. 8 Mapping functions The PINX mapping functions shall meet the following requirements. 8.1 Physical adaptation A PINX shall support the following physical adaptation: 8.1.1 64 kbit/s Unrestricted Digital Leased Line (D64U) Layer 1 ter

49、mination shall be in accordance with the requirements of co-directional interfaces at 64 kbit/s, specified in ITU-T Rec. G.703. NOTE 7 - ETS 300 290 provides additional information about this interface type. At the C reference point, the interface described in this clause provides for one IPC with the following bearer capability: Information transfer mode: circuit mode Information transfer capability: unrestricted digital information Information transfer rate: 64 kbit/s.ISO/IEC 17311:2000(E)