ITU-T E.424-1992 测试呼叫 Test Calls - Telephone Network and ISDN Quality of Service Network Management and Traffic Engineerin

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国外分类,ITU,ITU-T(电信标准分局),itu,测试,呼叫,test,calls,telephone,network,and,isdn,quality,of,service,network,management,and,traffic,engineerin

INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE NETWORK MANAGEMENT AND TRAFFIC ENGINEERING TEST CALLS Recommendation E.424 E.424 (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.424 was revised 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. © 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.424 Recommendation E.424 (10/92) TEST CALLS (revised 1992) 1 General Test calls carried out manually or automatically to assess the functioning of international circuits of connections are of four types: a) Type 1 test call A test call conducted between two directly connected international centres to verify that the transmission and signalling on an international circuit of a given group are satisfactory. b) Type 2 test call A test call conducted between two international centres not directly connected to verify transit operational facilities of an intermediate international centre. c) Type 3 test call A test call from an international centre to a subscriber type number in the national network of the distant country, generally as a result of a particular kind of fault. d) Subscriber-to-subscriber type test call1) A subscriber-to-subscriber type test call is a test call from a test equipment having the characteristics of an average subscriber line in one national network to a similar equipment in the national network of a distant country. Test calls types 1, 2, 3 and subscriber-to-subscriber test calls must not interfere with customer traffic. If, however, test calls contributing a significant load on a part of a network are to be made, prior advice should be given to the other Administration(s) concerned. Types 1 and 2 test calls for preventive maintenance should be conducted during light load periods. Types 1 and 2 test calls should be conducted as and when required for the investigation and clearance of faults. To aid the effectiveness of test calls type 3, the provision of a 1040 Hz to similar answering device in national networks is recommended. Type 3 test calls should be conducted only after adequate testing has been done by means of type 1 or 2 test calls and after the distant Administration has made the necessary check in its national network. Type 3 test calls should be conducted during light load periods. In order to find faults in last-choice equipment, circuit multiplication equipment or in-circuit multiplexing equipment, it may be necessary for tests to be carried out at the time when the traffic load approaches the full capacity of the route under test. The agreement of the distant network analysis point will be necessary before this test is carried out. Subscriber-to-subscriber type test calls can be made by agreement of the network analysis point in the countries concerned. Normally, unless there is a specific agreement between the Administrations concerned, subscriberto-subscriber type test calls would be considered for fault location after: 1) verifying that there are no evident faults in the international switching centres involved that would cause the poor Quality of Service or subscriber complaint being investigated; 2) verifying that type 1 or type 2 test calls have been made on the international circuits that might have been involved; _______________ 1) Recommendation M.1235 describes the use of automatic-to-subscriber test calls in more detail. Recommendation E.424 (10/92) 1 3) verifying that there are no evident faults in the national network from the outgoing exchange to the international centre in the originating country; 4) verifying that there are no evident faults in the nati

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