ITU-T F.32-1995 电报目的地指示器 Telegram Destination Indicators - Operations and Quality of Service - Telegraph Services (Study Grou

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国外分类,ITU,ITU-T(电信标准分局),itu,电报,目的,目的地,指示,指示器,telegram,destination,indicators,operations,and,quality,of,service,telegraph,services,study,grou

INTERNATIONAL TELECOMMUNICATION UNION )45 4 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU /0%2!4)/.3 !.$ 15!,)49 /& 3%26)#% 4%,%'2!0( 3%26)#%3 4%,%'2!- $%34).!4)/. ).$)#!4/23 )45 4 Recommendation & (Previously “CCITT Recommendation”) & (10/95) FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T 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 World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their 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 (Helsinki, March 1-12, 1993). ITU-T Recommendation F.32 was prepared by ITU-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 3rd of October 1995. ___________________ NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1996 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. CONTENTS Recommendation F.32 (10/95) Page 1 Background and scope ................................................................................................................................... 1 2 References and terminology........................................................................................................................... 1 3 Code structure ................................................................................................................................................ 1 4 Allocation of telegram network codes............................................................................................................ 2 5 Particular combinations for office codes........................................................................................................ 4 6 Allocation of office codes .............................................................................................................................. 4 7 Registration and publication........................................................................................................................... 4 Recommendation F.32 (10/95) i SUMMARY The operation of the “Telegram Retransmission System”, described in Recommendation F.31, depends on the use of a standard format in telegrams. The format contains routing and other operational information in a heading part. This includes a four-letter “destination indicator”, which is one of the key elements used for routing a telegram at switching centres in the origin country, and in any transit country(ies). They are also used for routing in the destination country. This Recommendation lays down the general principles applying to the selection of destination indicators, the allocation of the indicators’ four letters, the application of analogous two- and four-letter codes for certain other purposes in operating the telegram service, procedures for changing or adding to code allocations and the timely promulgation of the information on codes to Recognized Operating Agencies (ROAs). ii Recommendation F.32 (10/95) Recommendation F.32 Recommendation F.32 (10/95) TELEGRAM DESTINATION INDICATORS (Geneva, 1995) 1 Background and scope 1.1 The operation of the “Telegram Retransmission System”, described in Recommendation F.31, depends on the use of a standard format in telegrams. The format contains routing and other operational information in a heading part. This includes a four-letter “destination indicator”, which is one of the key elements used for routing a telegram at switching centres in the origin country, and in any transit country(ies). They are also used for routing in the destination country. Depending on the arrangements in individual centres, other elements used for automatic or manual routing include the origin indicator, the outgoing or incoming channel indicator and the office of destination. These elements are also used to provide the basis for the billing and accounting processes. For this and other operational reasons, the “F.31” format or its component parts are used when handling telegrams other than via the Telegram Retransmission System. Destination indicators have wide applicability. 1.2 This Recommendation

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