1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU SERIES I: INTEGRATED SERVICES DIGITAL NETWORK I n te rnetwo r k i n te rfaces 1.581 (09/97) General arrangements for B-ISDN interworking ITU-T Recommendation 1.581 (Previously CCIlT Recommendation) STDmITU-T
2、RECMN 1.581-ENGL 1997 4862591 Ob42239 550 I ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK GENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attributes General description of asynchronous transfer mode Scope General
3、 aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN Teleservices supported by an ISDN Supplementary services in ISDN Network functional principles Reference models SERVICE CAPABILITIES OVERALL NETWORK ASPECTS AND FUNCTIONS 1.100-1.199 1.1 10-1.119
4、 1.120-1.129 1.130-1.139 I. 140-1.149 I. 150-1.199 1.200-1.299 1.200-1.209 1.2 10-1.219 1.220-1.229 1.230-1.239 1.240-1.249 1.250-1.299 I .3 00-1.399 1.3 10-1.3 1 9 1.3204329 Numbering, addressing and routing I. 3 30-1.3 39 Connection types Performance objectives Protocol layer requirements General
5、network requirements and functions ISDN USER-NETWORK INTERFACES Application of I-series Recommendations to ISDN user-network interfaces 1.340-1.349 1.350-1.359 1.360-1.369 1.370-1.399 1.400-1.499 1.420-1.429 Layer 1 Recommendations 1.430-1.439 Layer 2 Recommendations Layer 3 Recommendations Multiple
6、xing, rate adaption and support of existing interfaces 1.440-1.449 1.450-1.459 1.460-1.469 AsDects of ISDN affecting terminal requirements 1.470-1.499 - INTERNETWORK INTERFACES 1.500-1.599 MAINTENANCE PRINCIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Management of ATM equipment I. 600-1.699 1.700-1.
7、799 1.730-1.749 1.750-1.799 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 1.581 GENERAL ARRANGEMENTS FOR B-ISDN INTERWORKING Summary This Recommendation gives guidelines of general arrangements and specifies requirements for B-ISDN interworking with other n
8、etworks. Detailed description of B-ISDN interworking with dedicated network is given in the 1.500-Series Recommendations. Source ITU-T Recommendation 1.581 was prepared by ITU-T Study Group 13 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 19th of September 1997. Recom
9、mendation 1.581 (09/97) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (IT-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, oper
10、ating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their
11、 turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborativ
12、e basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implement
13、ation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by IT members or others outside of the Recommendation development process.
14、 As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongl
15、y urged to consult the TSB patent database. O ITU 1998 All rights reserved. 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 the ITU. 11 Recommendation 1.581 (09/9
16、7) CONTENTS 6 7 8 9 Page Introduction 1 Scope Terms and definitions . Recommendations related to B-ISDN interworking Interworking scenarios and configurations 5.2 Interworking configurations . Service mapping between B-ISDN and other networks . 6.1 Bearer service mapping Higher Layer information map
17、ping 6.3 Supplementary service mapping . Requirements of interworking functions Types of interworking functions and their applications . Routing requirements . OAM information mapping 5.1 Interworking scenarios 6.2 7.1 7.2 General requirements of interworking functions between B-ISDN and other netwo
18、rks Recommendation 1.581 (09/97) 1 1 2 2 2 4 6 6 8 8 8 8 8 9 9 . 111 Recommendation 1.581 GENERAL ARRANGEMENTS FOR B-ISDN INTERWORKING (Geneva, 1997) 1 Introduction An ISDN has two aspects, one is a 64 kbit/s-based aspect and the other is a broadband aspect. To achieve their own aspect, they use dif
19、ferent technologies, e.g. CircuitPacket/Frame Mode and ATM (Asynchronous Transfer Mode), respectively. It is necessary to provide interworking between the two aspects of the ISDN to allow communication between terminals belonging to each part of the ISDN. Considering the services which are available
20、 in the B-ISDN, there will be a need for interworking with other networks such as PSTN, PSPDN, PLMNs (Public Land Mobile Networks), Satellite Networks (the necessity of this is for further study) as well as Private Networks. Accordingly there is a need to summarize interworking configurations and re
21、quirements to consider the evolutionary steps of public networks, the time at which B-ISDN services will be available to the user and the status of interworking related Recommendations. 2 Scope The objectives of this Recommendation are to give guidelines of general arrangements and to specify requir
22、ements forB-ISDN interworking with other networks as in Figure 1. Detailed description of B-ISDN interworking with dedicated network is given in the 1.500-Series Recommendations. C-.+yyZ Private networks T13 1 O1 20-97/d0 1 Figure 1R.581- B-ISDN interwording with other networks 3 Terms and definitio
23、ns The terms and definitions that are related to ISDN interworking are already defined in other Recommendations, and all of those terms and definitions are applicable to B-ISDN interworking. The following Recommendations are used to refer the terms and definitions of B-ISDN interworking with other n
24、etworks. - - - ITU-T Recommendation I. 112 (1993), Vocabulary of terms for ISDNs. ITU-T Recommendation 1.1 13 (1997), Vocabulary of terms for broadband aspects ofLSDN. ITU-T Recommendation 1.210 (1993), Principles of telecommunication services supported by an ISDN and the means to describe them. Rec
25、ommendations I.230-Senes, Bearer services supported by an ISDN, Recommendations 1.240-Series, Teleservices supported by an ISDN. - - Recommendation 1.581 (09/97) 1 - STD-ITU-T RECMN 1-SBL-ENGL lei97 48b2591 Ob42244 918 - - - - - Recommendations I.250-Senes, Supplementary services in ISDN. ITU-T Reco
26、mmendation 1.327 (1993), B-ISDNfirnctional architecture. ITU-T Recommendation 1.510 (1993), Definition and general principles for ISDN interworking. ITU-T Recommendation 1.520 (1993), General arrangements for network interworking between ISDNs. ITU-T Recommendation 1.525 (1996), Interworking between
27、 networks operating at bit rates less than 64 kbit/s with 64 kbit/s-based ISDN and B-ISDN. ITU-T Recommendation 1.530 (1993), Network interworking between an ISDN and a Public Switched Telephone Network (PSTN) . ITU-T Recommendation X.32 1A.540 (1 996), General arrangements for interworking between
28、Circuit-Switched Public Data Networks (CSPDNsj and Integrated Services Digital Networks (ISDNsj for the provision of data transmission services. ITU-T Recommendation X.325n.550 (1996), General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Integrated Services
29、 Digital Networks for the provision of data transmission services. ITU-T Recommendation 1.555 ( 1997), Frame relaying bearer service interworking. ITU-T Recommendation 1.570 (1993), Public/private ISDN interworking. 64 kbits-based ISDN. ITU-T Recommendation X.34 (1996), Access to packet switched dat
30、a transmission services via B-ISDN. - - - - - - ITU-T Recommendation 1.580 (1993, General arrangements for interworking between B-ISDN and - 4 Recommendations which relate to B-ISDN interworking are shown in Figure 2. This figure describes relationships among many Recommendations on B-ISDN interwork
31、ing with other networks. Recommendations related to B-ISDN interworking Other public networks (PSTN, PSPDN etc.) 64 kbis based- T1310130-97/d02 Rec. 1.525/1.570 NOTE 1 - It is not yet defined. NOTE 2 -The need for a Recommendation should be identified. NOTE 3 -Reference points for this are described
32、 in Recommendation 1.413. Figure 2fl.581- Recommendation status for B-ISDN interworking 5 Interworking scenarios and configurations 5.1 Interworking scenarios 5.1.1 Communication scenarios Considering various possibilities for interworking between B-ISDN and other networks, communication scenarios a
33、re classified as follows (see Figure 3): 2 Recommendation 1.581 (09/97) TE I I I 41 I 111 l , TE I I I I I 1 b II T131 O1 4O-97/603 4; I I I l l I I I 41 I I TE TE Terminal Equipment IWF Interworking Function l b I I I l I I I I I TE Figure 3fl.581- Communication scenario model - - - Scenario I is a
34、 direct interconnection scenario between B-ISDN and other networks; Scenario II is a network concatenation interworking scenario; Scenario III, the service capabilities provided between broadband user access points are restricted to one particular network capability. 5.1.2 Interworking scenarios Int
35、erworking scenarios between B-ISDN and other public networks (e.g. PSTN, PSPDNs) are classified into two types as depicted in Figure 4. One is an Indirect interworking with other public networks, and the other is a Direct interworking between B-ISDN and other public networks. h rc Public networks (P
36、STN, PSPDNs, etc.) T1310150-97/d04 Figure 4D.581- B-ISDN interworking configuration with public networks 5.1.2.1 Indirect interworking scenario In this scenario, interworking between B-ISDN and existing public networks (e.g. PSTN, PSPDN, etc.) takes place indirectly. That means interworking between
37、B-ISDN and other public networks occurs through 64 kbii/s-based ISDN. Therefore, B-ISDN interconnects with 64 kbiils-based ISDN and then 64 kbids-based ISDN connects with other public networks as depicted in Figure5. This scenario is one of the examples using interworking configuration d) as in Figu
38、re 7. In this case, existing ITU-T Recommendations are applied. 5.1.2.2 Direct interworking scenario In this scenario, interworking between B-ISDN and existing public networks (e.g. PSTN, PSPDN, etc.) takes place directly. That is, interworking between B-ISDN and other public networks happens withou
39、t the intervention of 64 kbit/s-based ISDN as illustrated in Figure 6. Recommendation 1.581 (09/97) 3 I Rec. 1.555A.580 T1310160-97/dO5 Figure 5fl.581- Indirect interworking configuration P B-ISDN I (Nhe) I (Note) I NOTE - It is not yet defined. This is for further study. Figure 6fl.581- Direct inte
40、rworking scenario 5.2 Interworking configurations Various interworking configurations are possible according to the applications and the situations of each country. Possible interworking configurations are illustrated in Figure 7. (Note 1) I I I TE TE I I TE TE (Note 1) I l I TE TE T131 O1 80-97id07
41、 4 NOTE 1 - Defined by Recommendation 1.413. NOTE 2 - Interworking with some networks (e.g. PSTN, PSPDN and CSPDN) is already specified in the I. 500-Series of Recommendations. Figure 7D.581- Possible interworking configurations 4 Recommendation 1.581 (09197) 5.2.1 B-ISDN interworking with PSTN To g
42、ive end-to-end telephony based services (e.g. Voice and Voiceband data service), B-ISDN interworking with PSTN is required. In this case, service features are restricted by a bearer service of PSTN (detailed service characteristics are referred in Tables 2 and 3). The AAL type for PSTN interworkins
43、with B-ISDN is for further study. Interworking configuration for this is described as in Figure 8. B-TA Figure 8fi.581- Interworking configuration of B-ISDN interworking with PSTN 5.2.2 B-ISDN interworking with PSPDN To use existing packet based data transmission services, B-ISDN interworking with P
44、SPDN is required. In this case, service features are also restricted by a bearer service of PSPDN (detailed service characteristics are referred in Tables 2 and 3). UNI interworking and NNI interworking with PSPDN are useful for each network providers situation, and there are small differences from
45、protocol point of view (e.g. UNI uses X.25 protocol and NNI uses X.75 protocol). Interworking configurations for these are shown in Figure 9. Access to Packet Switched Data Transmission service via B-ISDN is defined by the Recommendation X.34 as UNI interworking. NNI interworking is for further stud
46、y. a) UNI Interworking (Note) b) NNI Interworking NOTE -This is for further study. Figure 9A.581- Interworking configurations of B-ISDN interworking PSPDN 5.2.3 B-ISDN interworking with private network To give communication between terminals attached to private networks via public B-ISDN, B-ISDN int
47、erworking with private network is required as shown in Figure 10. Recommendation 1.581 (09/97) 5 Private Public Public Private I l I I TE - UNI UNI UNI UNI Private Public Private network 6-ISDN network TE TE 4 b Overall ATM Connection Category Establishment of communication T1310210-97/61 O Value of
48、 attributes Switched, reserved, permanent Figure 10A.581- General B-ISDN - Private network interworking configuration Communication configuration Type of connection In the case that private network is based on the ATM transport capabilities, overall ATM connection can be defined as end-to-end basis
49、shown in Figure 11. Point-to-point, point-to-multipoint, others are for further study vcc Private Public Public Private Overall ATM Connection Figure llA.581 -Overall ATM Connection for a mixed private ATM networkpublic B-ISDN scenario Interworking with ATM-based private network shall be applicable by overall ATM connection described in Table 1. Mapping of ATM Transfer Capabilities between private network and public network is for further study. 1 Bidirectional symmetric, bidirectional asymmetric, unidirectional I 6 Analysis of service characteristics and mapping of service attr
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