1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU M.1530 (03199) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Designations and information exchange Network maintenanc
2、e information ITU-T Recommendation M.1530 (Previously CCITT Recommendation) ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and general principles of maintenance and maintenance
3、 organization International transmission systems International telephone circuits Common channel signalling systems International telegraph systems and phototelegraph transmission International leased group and supergroup links International leased circuits Mobile telecommunication systems and servi
4、ces International public telephone network International data transmission systems , M. 1 O-M.299 M.300-M.559 M. 560-M. 759 M.760-M.799 M. 800-M. 899 M.900-M.999 M.1000-M. I099 M. 1 I OO-M. 1 I99 M.1200-M.1299 M. 1300-M. 1399 11 Designations and information exchange M.?400-M.1999 International trans
5、port network Telecommunications management network Integrated services digital networks Common channel signalling systems M.2000-M.2999 M.3000-M.3599 M. 3600-M. 3999 M.4000-M.4999 For further details, please refer to 1TU-T List of Recommendations. STDmITU-T RECflN floL530-ENGL 1999 4Bb2591 Obb0205 2
6、97 9 ITU-T RECOMMENDATION M.1530 NETWORK MAINTENANCE INFORMATION Summary A representative list of information1, useful to network maintenance activities, is provided in a structured table. Five categories of information are identified, based on the different natures of the events and their priority
7、in information exchange between maintenance elements within the same network operator or different network operators, network operators and service providers and service providers and their customers (Le. Maintenance Information to be exchanged at Customer Contact point (MICC). References to the mai
8、n relevant Recommendations are also given. Source ITU-T Recommendation M.1530 was revised by ITU-T Study Group 4 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 26th of March 1999. Keywords Customer, Failure, Fault, Maintenance information, Maintenance information to be
9、 exchanged at customer contact point, Network operator, Schedule, Service provider, Sudden and planned events. This list is not exhaustive and other types of information may be found depending on the continuous development and relevant update of other ITU-T Recommendations. Recommendation M.1530 (03
10、/99) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff que
11、stions 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 Recom
12、mendations 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. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and
13、 IEC. NOTE In this Recommendation the term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (G
14、eneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intel
15、lectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendat
16、ion. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1999 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechan
17、ical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation M.1530 (03199) STD-ITU-T RECMN M-3530-ENGL 1797 4862573 Obb0207 Tb2 U CONTENTS Page 1 . 1 General 2 Scope 1 3 Categories of information 1 . Further infomation 6 4 Recommendation M.1530 (03/99) .
18、 111 Recommendation M.1530 NETWORK MAINTENANCE INFORMATION (Published in 1980 as M. 1220; revised 1984, 1988; revised and renumbered 1992; revised in 1999) 1 General Maintenance of the international network is fundamentally concerned with ensuring that all its elements are operating in such a way th
19、at it may successfully provide a connection of specified or agreed quality whenever required. To achieve this objective it is important that network maintenance personnel of all involved network operators/service providers and any other people concerned in maintenance activities (e.g. service provid
20、ers customer care staff at customer contact point) have access to relevant information that may assist in identifjing networWservice impairments and to direct corrective action for fault localization and removal in case of a failure, exchanging also any relevant information with the customer when re
21、quired. 2 Scope This Recommendation provides general guidelines to transfer and use information from a maintenance standpoint. The purpose of transferring information is to assist maintenance elements in determining network elements (e.g. circuits and any other associated equipment) which are not pe
22、rforming to specified or agreed standards and also to provide any related information to the customer as agreed. 3 Categories of information The analysis and investigation of network problems requires the information to be subdivided into categories, based on the different nature of the events and o
23、n consequent differences in the urgency and/or priority of exchange between maintenance elements. This categorization is generally valid independently of the specific service carried on the network involved. Five main categories of information can be defined: 1) information on sudden events (to be d
24、ealt with in real time); 2) information on planned events (to be dealt with in time for the necessary action); 3) information on persistent problems (to be dealt with when the observed problem persists longer than a certain time); 4) periodic information (to be dealt with periodically); 5) informati
25、on on particular aspects subject of inter-network operators and/or service providers and customers agreements (to be exchanged when necessary). Typical information of each category is listed in Table 1 with the indication of the references and some explanations in the notes. Recommendation M.1530 (0
26、3/99) 1 STDmITU-T RECMN M*1530-ENGL 1999 48b2591 Obb0209 835 I 2.8 Information on sudden events Failures on international transmission systems included in Mutual Aid plans I Failures on international transmission systems not included in Mutual Aid plans (Note 1) Failures on national transmission sys
27、tems (especially those affecting international leased and special circuits) (Note 2) Planned outages of international switching , exchanges Mutual Aid In real time Table 1N.1530 Item Typical information needed for network maintenance purposes References Urgency and/or priority of exchange 1 1.1 ilan
28、s 1.2 M.495 M.725 W.716 1.3 1.4 Relevant faults in international switching exchanges (Note 3) M.716 M.720 E.4 1 O 1.5 Temporary decrease in the ASR (Answer Seizure Ratio) parameter (Note 4) for the telephone traffic M.720 E.411 E.420 M.700-series 1.6 Normal fault reports for circuits, switching inte
29、r-register and line signalling, etc. (Note 5) 1.7 Information to localize and clear the faults, permit protectiodreversibility and facilitate restorationhormalization for the transport network A.2 130 1.8 Fault report and network fault report d.1537 2 Information on planned events n time for the nec
30、essary actions Planned outages of international links 2.1 v. 1540 14.721 2.2 Planned outages of national transmission systems, which affect international leased and special circuits i4.1540 v1.1014 2.3 M.716 M.720 E.411 2.4 M.720 E.149 Routing data changes (Note 6) 2.5 Circuit order of selection cha
31、nges (Note 7) Changes in numbering plan of the country 2.6 M.7 16 2.7 Changes in the order of selection of international telephone traffic (Note 8) Changes in the routing of special services (e.g. for telephone service codes 11 and 12, direct, international toll-free services, etc.) Changes in infor
32、mation regarding leased and special circuits (route, bit rate, etc.) M. 1 000-series I 2*10 Planned outages impacting the service to the customer M.1537 2 Recommendation M.1530 (03/99) STD-ITU-T RECMN M-1530-ENGL 1999 4662591 Ob60210 557 When the observed problem persists longer than a certain time
33、Table 1M.1530 (continued) References Item Typical information needed for network maintenance purposes Information on persistent problems Urgency and/or priority of exchange 3 4.1550 3.1 3.2 Recurrent faults Recurrent faults in international leased circuits vf. 1560 3.3 Hard-to-reach destinations (No
34、te 9) L4.720 2.542 Z.412 Fault report patterns (Note 10) 3.4 L4.720 3.5 Fault follow-up between service provider and the customer Periodic information k.1537 4 Periodically 4.1 Contact point information General and reference information to be exchanged between the service provider and the customer i
35、4.1510 i4.1537 4.2 4.3 Fault report trend data (Note 11) M.715 M.7 16 M.720 4.4 National network call completion information for the telephone traffic (Notes 12 and 13) International network call completion information for the telephone traffic (Note 14) M.720 E.600 4.5 M.720 E.420 E.422 E.426 E.600
36、 4.6 Traffic service observations undertaken either for specific purposes or for preparation of Tables 1E.422 and 1E.423 M.720 E.422 E.423 M.720 4.7 Data from traffic measuring equipment, e.g. loading in erlangs, percentage occupancy and overflow intensities Results of automatically generated test c
37、alls 4.8 M.1235 4.9 Service availability information of telecommunication systems Service availability information of international leased circuits M.72 1 4.10 M.1016 4.11 Transmission restoration time M.495 Recommendation M.1530 (03/99) 3 Item 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.1 1 5.12 T
38、ypical information needed for network maintenance purposes Table 1M.1530 (concluded) References Urgency and/or priority of exchange Information on inter-network operators and/or service providers and customers agreements related to maintenance activities Maintenance schedule for routine maintenance
39、of international carrier system Maintenance schedule for signalling and switching routine tests and measurements Maintenance schedule for routine maintenance of international public telephone circuits Preliminary exchange of information for the provision of international leased circuits and internat
40、ional data transmission systems Maintenance schedule for preventive maintenance on international leased circuits Maintenance schedule for automatically generated test calls for assessment of network performance When necessary M.500 M.520 M.7 19 M.732 M.600-series M.733 M. 1045 M. 1 060 M. 123 5 Rout
41、ing data Order of selection of circuit (Note 7) Incoming test facilities at international switching centres Order of the selection of international traffic trunks (Note 8) M.716 M.720 E.149 M.734 4 Recommendation M.1530 (03199) 5-13 Information concerning signalling, switching and transmission syste
42、ms Results of specific investigations on transmission M.7 17 systems or on switching and line and inter-register M.7 18 signalling M.719 Fault localization, service restoration and network M. 1537 repair information between service provider and customer M.720 STDmITU-T RECMN fi-1530-ENGL 1999 W 4862
43、591 ObbOiL2 32T m NOTE 2 - In the international centres, international leased and special circuits are routed to the destination via national group links or digital blocks. A failure of these group links or digital blocks leads to a break in the international circuits. In these cases, it is of parti
44、cular importance to advise the other maintenance elements (e.g. the fault report points) in involved network operators and/or any involved service provider in order to avoid unnecessary faults location in the other countries and consequently to reduce the MTTR and/or MTRS to specified/agreed levels/
45、limits. In some cases, according to a specific agreement the aforesaid failure information may be also forwarded to other people involved in maintenance activities of the interested circuits (e.g. service providers customer care staff at customer contact point) for any subsequent exchange of informa
46、tion with the customer. NOTE 3 - This exchange of information is required when the fault involves a relevant decrease in the level of service offered to another country. In this case, the networks management centres must also be informed. NOTE 4 - Whenever the ASR temporarily decreases with respect
47、to the reference historical value, the appropriate maintenance point in the terminating country must be informed, after the necessary local investigations have been carried out, in order to Co-operate and to remove the distant network loss. The network management centres must also be informed in ord
48、er to initiate expansive and protective actions. NOTE 5 - For the normal faults reports, the procedures specified in Recommendation M.710 and others of the M.700-series are adopted. NOTE 6 - Routing data and changes thereto (see Recommendation E.149 for telephone traffic) can reduce the consequences
49、 of misrouting of traffic due to invalid dialling. An improvement can be expected in: - - - - circuit utilization. NOTE 7 - Selection of circuits not in the sequence agreed upon can cause: - uneven distribution of traffic among the circuits involved; the number of calls which fail; the number of calls switched more than necessary; the number of calls which contribute to congestion on routes accessed improperly; - increased probability of simultaneous seizures which lead to initial call failure and subsequent re-attempts. These may lead to different levels o
