ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp

pdf标准 ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp

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ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp 第 1 页 ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp 第 2 页 ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp 第 3 页 ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp 第 4 页 ITU-T E.723-1992 No.7信令网服务等级参数 Grade-of-Service Parameters for Signalling System No. 7 Networks (Study Group II) 8 pp 第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,no,信令,服务,等级,参数,grade,of,service,parameters,for,signalling,system,no,networks,study,group,ii,pp

INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING GRADE-OF-SERVICE PAREMETERS FOR SIGNALLING SYSTEM No. 7 NETWORKS Recommendation E.723 Geneva, 1992 E.723 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.723 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 16 of June 1992. ___________________ CCITT NOTES 1) In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. 2) A list of abbreviations used in this Recommendation can be found in Annex A. © ITU 1992 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. Recommendation E.723 Recommendation E.723 GRADE-OF-SERVICE PARAMETERS FOR SIGNALLING SYSTEM No. 7 NETWORKS 1. Scope and objectives Based on the reference connections for ISDN circuit switched services and the grade-of-service (GOS) parameter values contained in Recommendation E.721, this Recommendation provides appropriate reference connections for the S.S. No. 7 network and identifies the signalling network GOS parameters and their target values. Further, the Recommendation also provides guidelines for partitioning/allocating the signalling network end-to-end GOS to the basic components of the S.S. No. 7 network. The reference connection and GOS parameters and values for source transaction type services requiring data base lookup are also included. 2 Reference connections for S.S. No. 7 networks Reference connections for ISDN circuit switched service are contained in Table I/E.721 in terms of the number of switching nodes in local, toll or international connections. In the control plane, several configurations of signalling links and signal transfer points (STPs) 1) between the signalling points (SPs) associated with two adjacent nodes in the E.721 connections are possible. For example, the relations shown in Figure I/E.723 may commonly exist. The configurations, on the following page, are consistent with Recommendation Q.709 and represent the basic segments of the S.S. No. 7 network. In this Recommendation therefore, the S.S. No. 7 end-to-end delay objectives are allocated per user plane circuit group (basic S.S. No. 7 network segment). Individual Administrations may choose the signalling network configuration and the resulting sub-division of delay objectives to signalling link-sets and STPs within a national network. The reference connections for the S.S. No. 7 network (i.e. the number of STPs) corresponding to Recommendation E.721, are shown in Table I/E.723. The signalling network configuration used as the reference connection for a transaction type service requiring a single data base lookup is shown in Figure 2/E.723. Reference connections for more complicated intelligent network (IN) calls is for further study. 3 GOS parameters for S.S. No. 7 network 3.1 Two delay GOS parameters for ISDN circuit switched services that depend on the performance of the S.S. No. 7 network include the post-selection delay and the answer signal delay. The target values (mean) for these are specified in Recommendation E.721 for local, toll and international reference connections under normal load (Table 2/E.721). ________________ 1) Throughout this Recommendation the STP designation is used to denote either Message Transfer Part (MTP) processing capability or MTP and Signalling Connecfion Control Part (SCCP) processing capability. The MTP and SCCP protocols are defined in the Q.700-Series Recommendations. Recommendation E.723 1 a) 1 signalling link set } 0 STP Per user plane circuit group b) 2 signalling link sets } 1 STP Per user plane circuit group 3 signalling link sets } 2 STPs Per user plane circuit group c) d) T0202090-90 4 signalling link sets } 3 STPs Per user plane circuit group Exchange Signa

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