ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St

pdf标准 ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St

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ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St 第 1 页 ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St 第 2 页 ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St 第 3 页 ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St 第 4 页 ITU-T E.172-1992 综合业务数字网(ISDN)选路计划 ISDN Routing Plan - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (St 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,综合,业务,数字,数字网,isdn,计划,isdn,routing,plan,telephone,network,and,isdn,operation,numbering,routing,and,mobile,service,st

INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN OPERATION, NUMBERING, ROUTING AND MOBILE SERVICE ISDN ROUTING PLAN Recommendation E.172 E.172 (10/92) FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation E.172 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 30th October 1992. ___________________ CCITT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized private operating agency. ã ITU 1993 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. PAGE BLANCHE Recommendation E.172 Recommendation E.172 ISDN ROUTING PLAN (1992) 1 Introduction and scope 1.1 ISDN capabilities are currently being introduced into national and international networks. ISDN provides access to a wide range of services, each of which must be supported by a minimum level of network capabilities. For each service requested by a user, the network must provide the appropriate switching, signalling and transmission capabilities required to successfully complete the call. In practical ISDN implementations some of the ISDN functions will be implemented within the same network elements whereas other ISDN functions, such as those required for interworking, packet handling, etc. will be implemented in “special” network elements. 1.2 The purpose of this Recommendation is to provide network operators with the information necessary to ensure that ISDN services can be routed effectively and efficiently by the various networks which support them. 1.3 The Recommendation establishes basic principles on which to base network design and routing decisions. It provides detailed information on the mapping between ISDN bearer services, ISDN connection types and network capabilities (e.g. transmission links, signalling systems, etc.) required to support a call. Guidance on the conveyance and use of routing information within network components is also included. Further information on the routing implications of network interworking is included at Annex C. 1.4 The Recommendation is intended to provide a single definitive reference Recommendation for ISDN routing. It supersedes earlier ISDN routing Recommendations, specifically Recommendation E.172 (1988) – Call routing in the ISDN era, and Recommendation I.335 (1988) – ISDN routing principles. 1.5 The scope of the Recommendation is limited to circuit and packet switched bearer services. It is further limited to services supported by Recommendation Q.767. Broadband services routing requirements are for further study. 2 References and related Recommendations The related Recommendations and their relationship to Recommendation E.172 are depicted below in Figure 1/E.172. 3 ISDN routing principles 3.1 The following basic ISDN routing principles are recommended to assist in managing the trade-off between customer satisfaction and network optimization. a) complete as many calls as possible; b) utilize network resources efficiently: – match network capability to service demand; – minimize the use of “overmatching” network capability; – minimize the number of links in a route; Recommendation E.172 (10/92) 1 ISDN basic description I.100-Series Recs. ISDN telecommunication services I.200-Series Recs. ISDN network capabilities I.300-Series Recs. ISDN interworking I.500-Series Recs. ISDN signalling Recs. Q.931, Q.761, X.25, X.75 ISDN Routing plan Rec. E.172 Numbering plans Recs. E.164, E.165, E.166, X.121 Routing plans Recs. E.170, E.171, X.110 Reference connections Recs. G.801, X.92 19 -0322020T FIGURE 1/E.172 c) adhere to network performance parameters: – delay (call set up delay, transfer delay, post-dialling delay); – transmission quality; – error rates; – throughput; – availability; d) minimize translation complexity; e) minimize digit analysis and manipulation; f) ens

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