1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 : TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!.G13-!#().%G0G0,!.5!%.%47/2+G0G0-!.!%-%.4G0G0!$-).)342!4)/.)45G134G0G0RecommendationG0G0: (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Z.337 was published in Fascicle X.7 of the Blue Book. This
2、file is an extract from theBlue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, thecontents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below).2 In this Recommendation, the expression “A
3、dministration” is used for conciseness to indicate both atelecommunication administration and a recognized operating agency. ITU 1988, 1993All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and m
4、icrofilm, without permission in writing from the ITU.Fascicle X.7 - Rec. Z.337 1Recommendation Z.337Fascicle X.7 - Rec. Z.337NETWORK MANAGEMENT ADMINISTRATION1 GeneralThis Recommendation has been developed in accordance with the methodology defined inRecommendations Z.332 and Z.333.The main part of
5、this Recommendation deals with the model of the Network Management Administration. Aglossary of the terms used is also included.The list of operator jobs and the list of system functions to be controlled are contained in Annex A.For each system function to be controlled by means of MML, one or more
6、MML functions can be derived andeach of them can be described using the metalanguage defined in Recommendation Z.333, in order to detail therelevant information structure.Annex B contains guidelines for the definition of the list of MML functions and the information structurediagrams associated to e
7、ach of them to be used as guidelines.2 IntroductionNetwork management is the function of supervising the network and taking action to control the flow of trafficso as to ensure the maximum utilization of the network in all situations. The objective is to enable as many calls aspossible to be success
8、fully completed. In its current scope, Network Management doesnt address the aspects ofmanaging traffic on portions of the network that are leased or under the control of network customers.According to CCITT Recommendations E.410 through E.414, E.502, Q.542 and Q.544, Network Managementrequires the
9、performance of a certain number of activities to detect abnormal network conditions and to initiate theexecution of corrective actions and/or controls. The general scenario of Network Management activities can bedescribed through the involved information flow as depicted in Figure 1/Z.337. Network R
10、aw Data related to trafficparameters and the status (i.e. level of overload, out of service conditions, etc.) of the Network Elements can beprocessed to provide Network Management Parameters, using the Network Reference Data which are necessary tocalculate Network Management Parameters. The Network
11、Raw Data are produced from Network ManagementElements.Network Management Parameters, describing the current network status and performance, can be related tosome threshold values (representing the boundary between normal and abnormal behaviour) in order to detectabnormal conditions.Abnormal Conditio
12、n Reports, Network Management Parameters and other information (from telephoneoperators, work centres, news media, etc.) are used to identify the origin of the problem and, as a consequence, todecide the proper actions to be taken or the most suitable controls to be activated.Network problem identif
13、ication and consequent corrective actions can be handled manually or automatically byan “expert” system which is capable of performing the functions of abnormal condition detection, problem analysis andproblem solving. All the activities carried out for Network Management can be handled by the opera
14、tor supervision.Furthermore, for cooperation, coordination and planning purposes, Network Management Reports could bedistributed to other operating centres, to higher authorities, etc.Depending on each Administration and network organization, Network Management activities can be partiallyor totally
15、performed at exchange level or concentrated in one or more Network Management Centres.Figure 2/Z.337 contains an example of how the general scenario can be applied to a particular operatingorganization. In this example, the functions shown for the Network Element and Network Management OperationsSys
16、tem are performed by the system under operator control.Considering the Network Management scenario and the operator activities (listed in Annex A to thisRecommendation) three different sub-areas can be recognized: Network Management Data administration; Network Management Controls administration; Ne
17、twork Management Data Distribution administration.2 Fascicle X.7 - Rec. Z.337Only the sub-areas for Network Management Data administration is covered by the present Recommendation.The remaining two sub-areas, namely Network Management Controls administration and Network Management DataDistribution a
18、dministration are left for further study.Fascicle X.7 - Rec. Z.337 3 4 Fascicle X.7 - Rec. Z.3373 Network Management Models3.1 IntroductionAccording to the division of Network Management activities in three sub-areas as stated in 2, three differentmodels, as indicated in the following, have to be de
19、veloped: Network Management Data administration model; Network Management Controls administration model; Network Management Data Distribution administration model.3.2 Network Management Data administration modelNetwork Management Data administration sub-area concerns the operator activities for mana
20、ging the set ofinformation necessary to monitor the network status and performance. This information can be routed toward properdisplay and/or storage devices in the Network Management Centre or passed to remote Administrations under operatorcontrol.Data administration is applied to the following da
21、ta: Network Raw Data; Network Management Parameters; Network Management Indicators; Network Reference Data.3.2.1 Network Raw DataNetwork Raw Data describe, for each network management element, the current operating conditions (e.g.exchange load, number of in-service circuits, etc.) and traffic behav
22、iour (e.g. number of seizures for circuits sub-group).Network Raw Data are administered by the MML functions for Traffic Measurements Administration,therefore they are not considered in the Network Management functional area.3.2.2 Network Management ParametersNetwork Management Parameters describe t
23、he network status and performance in terms of entities (as indicatedin Recommendation E.411) and Network Management Objects.Network Management Objects are the set of Network Elements subject to measurement for NetworkManagement purposes.One or more Network Management Objects can be grouped as origin
24、 and/or destination objects to define trafficflow; the Network Management Objects are hierarchically presented below: network group; network; exchange group; exchange; circuit group; circuit sub-group.Network management monitoring and control of circuit groups and circuit sub-groups can only be perf
25、ormedvia an exchange.In Figure 3/Z.337 is represented, as an example, a Network Management Parameter in terms of the entity“answer/seizure ratio” for traffic handled by a circuit sub-group and forwarded to a set of exchanges characterized bythe same destination code.Fascicle X.7 - Rec. Z.337 53.2.3
26、Network Management IndicatorsNetwork Management Indicators represent the logical results (e.g. yes or no) obtained from the comparison ofNetwork Management Parameters against a predefined set of numerical values (thresholds).Numerical values associated with thresholds can be time-dependent (e.g. mor
27、ning/afternoon hours, holidays,etc.).3.2.4 Network Reference DataNetwork Reference Data can be administered by the MML functions which are appropriate for each type ofreference data, therefore they are not considered in the network management functional area.3.3 Network management control administra
28、tion modelTo be developed.3.4 Network management data distribution administration modelTo be developed.4 Glossary of termsabnormal Condition ReportInformation produced in the Network Management Centre after detection of abnormal network status orperformance.circuit groupThe set of all switched circu
29、its which directly interconnect one exchange with another.circuit sub-groupA group of circuits within a circuit group which are uniquely identifiable for operational or technical reasons. Acircuit group may consist of one or more circuit sub-groups.6 Fascicle X.7 - Rec. Z.337exchange groupA set of e
30、xchanges which handles traffic forwarded to or coming from a specific geographical area (e.g. areacode, switching centre, etc.).networkAll the exchanges which are relevant to the service standpoint operated by a company in a work ElementTelecommunication equipment which may perform signalling, switc
31、hing and transmission work groupA group of telecommunication networks relevant to the service standpoint (e.g. different operating companiesoffering the same service in the same country).network management actionThe activity performed, not necessarily in the network elements, to regulate traffic wor
32、k Management CentreA centre where network management functions are performed (e.g. O and M centre, switching centre).network Management ControlThe capabilities in network elements to regulate traffic flow and network operation in order to insure themaximum utilization of the network capacity in all
33、situations of traffic overload and network element work Management DataThe set of information necessary to monitor, detect and identify a network work Management IndicatorA logical result of comparison of Network Management Parameters and thresholds work Management InformationThe set of information
34、produced in the Network Management Centre describing the network status andperformance, the abnormal conditions detected, the problems identity and the active network management work Management ObjectA set of network elements under control of network management functions and/or subject to measuremen
35、t fornetwork management work Management ParametersInformation produced in the Network Management Centre to be used for the production of abnormal conditionreport and for display on alerting devices.Fascicle X.7 - Rec. Z.337 7network Management SystemA system which performs Network Management work Pr
36、oblem IdentityInformation produced in the Network Management Centre to indicate the type of problem detected and theportion of the network and/or services work Raw DataNetwork information provided by network elements and used for the production of Network ManagementParameters and for display on aler
37、ting work Reference DataInformation on the network elements and structure (e.g. circuit groups, number of circuits in a circuit group,routing information, type and quantity of switching system components).ANNEX A(To Recommendation Z.337)List of system functions to be controlled by means of MMLand li
38、st of jobsA.1 List of system functions to be controlled by means of MMLNetwork Management functions include: performing measurements of network status and performance; performing Network Management Actions; performing Network Management information distribution.A.2 List of jobsThe jobs are supposed
39、to be performed at Network Management Centre level (i.e. any centre which performsnetwork management functions).A.2.1 To determine the appropriate Network Raw Data to be collected the purpose of this job is to select the appropriate sets of Network Raw Data for the evaluation of thenetwork elements
40、and traffic monitoring; the Network Raw Data are defined for each specific network element. The operator is supposed to selectthe consistent subset of information necessary for monitoring purposes; the complexity of the job is medium; the frequency of the job is low.A.2.2 To collect appropriate Netw
41、ork Raw Data the purpose of this job is to schedule the collection of Network Raw Data from network elements: the operator is supposed to schedule selected sets of Network Raw Data for collection; the complexity of the job is medium; the frequency of the job is low.8 Fascicle X.7 - Rec. Z.337A.2.3 T
42、o define the appropriate parameters to be used for the network and traffic monitoring the purpose of this job is the definition of the Network Management Parameters for the evaluation of thenetwork status and traffic performance. The Network Management Parameters are derived from theavailable set of
43、 Network Raw Data; the operator is supposed to define the set of information necessary for Network Management Parametersproduction; the complexity of the job is medium; the frequency of the job is low.A.2.4 To choose the Network Management Parameters with which to monitor network status and performa
44、nce the purpose of this job is to choose, from defined Network Management Parameters, a subset for theevaluation of network status and performance; the operator is supposed to choose the Network Management Parameters necessary for networkmonitoring; the complexity of the job is medium; the frequency
45、 of the job is low.A.2.5 To activate and deactivate the production of Network Management Parameters the purpose of this job is to control the production of any Specific Network Management Parameter; the system is supposed to store the Network Management Parameters produced; the complexity of the job
46、 is low; the frequency of the job is low.A.2.6 To assemble appropriate reference data to characterize traffic behaviour of network elements the purpose of this job is to obtain appropriate reference data describing network behaviour to be used inthe analysis of the network problems; the operator is
47、supposed to determine what reference data is to be collected and stored; data items characterizing the network elements and their interrelationships are supposed to be collected andstored in the Network Management Centre; the complexity of the job is medium; the frequency of the job is low.A.2.7 To
48、define or change the thresholds for the network status and performance monitoring the purpose of this job is to define a specific set of thresholds to which Network Management Parameterswill be compared; the operator is supposed to define, for the selected Network Management Parameters, the numerica
49、l valuesto be used as thresholds; the complexity of the job may be medium depending on the number of thresholds to be defined; the frequency of the job is low.A.2.8 To associate Network Management Parameters with selected thresholds the purpose of this job is to associate selected thresholds with Network Management Parameters; the o
