1、CCITT RECNN*F*104 91 4862591 05b1220 5 INTERNATIONAL TELECOMMUNICATION UN ION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONS U LTATI VE COM M I TTE E TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.104 INTERNATIONAL LEASED CIRCUIT CIRCUIT DESIGNATIONS SERVICES - CUSTOMER Reco
2、mmendation F.104 Geneva, 1991 CCITT RECNN*F.LOLI 91 = 4b2591 05b1221 7 I- l NTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.104 INTERNATIONAL LEASED CIRCUIT CIRCUIT DESIGNATI
3、ONS SERVICES - CUSTOMER Recommendation F.104 Geneva, 1991 - CCITT RECMN*F-LOY 91 48625911 05611222 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 technica
4、l, 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 appr
5、oval of Recommendations by the members of CCIIT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation F.104 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 11th of October 1991. CCIT NOT
6、E In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, elec
7、tronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECMN*F-L04 91 = 4862593 0561223 O Recommendation F.104 INTERNATIONAL LEASED CIRCUIT SERVICES - CUSTOMER CIRCUIT DESIGNATIONS 1 ntr oduction 1.1 CCITT Recommendation M. 140 (Designations of
8、international circuits, groups, group and line links, digital blocks, digital paths, data transmission systems and related information) specifies a scheme for the designation of international routes 1) . 1.2 The designation scheme is based on a layered approach with: layer 1 - a unique identificatio
9、n providing limited information; layer 2 - additional information that must be known at both termination of the route; and layer 3 - (optional) -bilateral information not the subject of international standardization. 2 General 2.1 Layer 1 of the Recommendation M.140 designation scheme provides uniqu
10、e circuit information that is common at both ends of the route and is suitable to be made available to the customer as the customer international circuit designations. 3 Customer international circuit designations 3.1 Section 3 of Recommendation M.140 specifies the format of the designation for fixe
11、d circuits as given in the following subsections. An example of the format of a unique circuit designation is shown in Figure 1F.104. 3.2 The customer circuit designation should be in accordance with layer 1 designation of $ 3.2 of Recommendation M. 140. 3.2.1 Towns A and B, with a possible (optiona
12、l) transmission station suffix, should identify the terminal points of the circuit. They appear in alphabetical order. 3.2.2 The identification of the terminal point is up to the Administration concerned. In cases where the town name exceeds the maximum length of 12 characters, the Administration sh
13、ould supply a suitable abbreviation which must be unique. The use of the last three characters to indicate the country is suggested. 3.2.3 The transmission station suffix is an optional field which may be used further to identify the terminal point, e.g. when there is more than one RPOA operating in
14、 the town. The need for a suffix and its form should be decided by the RPOA concerned. 3.2.4 The function code should identify the type of circuit. Function codes should be in accordance with Recommendation M. 140. 3.2.5 The serial number should be a separate numbering series for each traffic relati
15、on and function code. In the case of more than one RPOA, serial numbering will be on a transmission station to transmission station and functional code basis. 1 The word “route” in this context has a very general meaning. Recornmendation F.104 1 CCITT RECNN*F-L04 93 H 4862573 0563224 2 3.3 3.4 agree
16、d between the two terminal Administrations. Layer 2 of Recommendation M.140 is meant for Administration use. In special cases in which CCIIT Recommendations do not apply, the circuit designation should be bilaterally Example: BERN/lRS-NEW YORK/lRC TPl Format of designation e.g. No. of Characters Town A BERN 1-12 Delimi- ter U) I 1 Trans- mission station suffix optional 1 RS 1-3 Delimi- ter (-) 1 Town B NEW YORK 1-12 FIGURE 1F.104 Format of unique circuit designation Function Serial code No. I 2 Recommendation F.104
