1、INTERNATIONAL TELECOMMUNICATION UNIONITU-T G.774.6TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU(02/2001)SERIES G: TRANSMISSION SYSTEMS AND MEDIA,DIGITAL SYSTEMS AND NETWORKSDigital terminal equipments Operations, administrationand maintenance features of transmission equipmentSynchronous digital hie
2、rarchy (SDH)unidirectional performance monitoring for thenetwork element viewCAUTION !PREPUBLISHED RECOMMENDATIONThis prepublication is an unedited version of a recently approved Recommendation.It will be replaced by the published version after editing. Therefore, there will bedifferences between th
3、is prepublication and the published version.FOREWORDThe International Telecommunication Union (ITU) is the United Nations specialized agency in the field oftelecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ ofITU. ITU-T is responsible for studying techn
4、ical, operating and tariff questions and issuingRecommendations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Assembly (WTSA), which meets every four years,establishes the topics for study by the ITU-T study groups which, in
5、turn, produce Recommendations onthese topics.The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.In some areas of information technology which fall within ITU-Ts purview, the necessary standards areprepared on a collaborative basis with ISO and IEC.NOTEIn
6、 this Recommendation, the expression “Administration“ is used for conciseness to indicate both atelecommunication administration and a recognized operating agency.INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation mayinvolve
7、the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or othersoutside of the Recommendation development process.As of the date of approval of this Recommendat
8、ion, ITU had/had not received notice of intellectualproperty, protected by patents, which may be required to implement this Recommendation. However,implementors are cautioned that this may not represent the latest information and are therefore stronglyurged to consult the TSB patent database. ITU 20
9、01All 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 ITU.ITU-T G.774.6 (02/2001) Prepublished version 1RECOMMENDATION G.774.06“SYNCHRONOUS DIGITA
10、L HIERARCHY (SDH) UNIDIRECTIONALPERFORMANCE MONITORING FOR THE NETWORK ELEMENT VIEW“SummaryThis Recommendation provides an information model for the performance monitoring ofSynchronous Digital Hierarchy (SDH) network. This model describes the managed object classesand their properties for the perfo
11、rmance monitoring function of unidirectional paths and sections, asdefined in Recommendation G.784 and as related to SDH network elements. These objects areuseful to describe information exchanged across interfaces defined in Recommendation M.3010Telecommunications Management Network (TMN) architect
12、ure for the management of theperformance monitoring function.1ScopeSDH Performance Monitoring Functions are used to monitor specified performance events ofspecified Termination Points managed objects and to report these performance data, as well asQuality Of Service Alarms to its managing system acc
13、ording to a given schedule.Recommendation M.2120 defines maintenance of transport network, Recommendation G.784defines the management of SDH-based network element. This Recommendation defines the objectmodel based on Recommendation Q.822 according to the requirements described inRecommendations G.78
14、4 and M.2120 with respect to unidirectional performance monitoring. Thismodel uses generic mechanisms defined in Recommendation Q.822. The information modelfor bidirectional performance monitoring is covered by Recommendation G.774.1. ThisRecommendation reuses functionality of Recommendation G.774.1
15、 wherever possible.Structure of this RecommendationSubclause 5.1 provides an overview of the unidirectional SDH performance monitoring informationmodel. Clauses 6-15 describe the information model using the notation mechanisms defined inRecommendation X.722, Guidelines for the definition of managed
16、objects. Clause 15 contains thesyntax definitions of the information carried in the protocol using Abstract Syntax Notation One(ASN.1) defined in Recommendations X.680 - 683. Naming and inheritance are illustrated inAppendix I. Clauses 5-15 are normative; all other text is informative.2 ReferencesTh
17、e following Recommendations and other references contain provisions which, through referencein this text, constitute provisions of this Recommendation. At the time of publication, the editionsindicated were valid. All Recommendations and other references are subject to revision: all users ofthis Rec
18、ommendation are therefore encouraged to investigate the possibility of applying the mostrecent edition of the Recommendations and other references listed below. A list of the currentlyvalid ITU-T Recommendations is regularly published. ITU-T Recommendation G.707 (2000), Network node interface for th
19、e synchronous digitalhierarchy. ITU-T Recommendation G.773 (1993), Protocol suites for Q-interfaces for management oftransmission systems ITU-T Recommendation G.774 (2000), SDH management information model for thenetwork element view. ITU-T Recommendation G.783 (1998), Characteristics of Synchronous
20、 Digital HierarchyITU-T G.774.6 (02/2001) Prepublished version 2(SDH) equipment functional blocks. ITU-T Recommendation G.784 (1999), Synchronous Digital Hierarchy (SDH)management. ITU-T Recommendation G.803 (2000), Architectures of transport networks based on thesynchronous digital hierarchy (SDH).
21、 ITU-T Recommendation G.831 (2000), Management capabilities of transport networksbased on the synchronous digital hierarchy (SDH). ITU-T Recommendation G.958 (1994), Digital line systems based on SDH for use onoptical fibre cables. ITU-T Recommendation M.60 (1993), Maintenance terminology and defini
22、tions. ITU-T Recommendation M.2120 (1997), PDH path, section and transmission system andSDH path and multiplex section fault detection and localisation procedures. ITU-T Recommendation M.3010 (2000), Principles for a telecommunications managementnetwork. ITU-T Recommendation M.3013 (2000), Considera
23、tions for a telecommunicationsmanagement network. ITU-T Recommendation M.3100 (1995), Generic network information model. ITU-T Recommendation Q.811 (1997), Lower layer protocol profiles for the Q3 and xinterfaces. ITU-T Recommendation Q.812 (1997), Upper layer protocol profiles for the Q3 and xinter
24、faces. ITU-T Recommendation Q.822 (1994), Stage 1, stage 2 and stage 3 description for theQ3-interface: performance management. ITU-T Recommendation X.680 (1997), Information technology - Abstract Syntax NotationOne (ASN.1): Specification of basic notation. - X.683 (1997), Information technology -Ab
25、stract Syntax Notation One (ASN.1): Parameterization of ASN.1 specification. ITU-T Recommendation X.701 (1997), Information technology - Open SystemsInterconnextion - Systems management overview. ITU-T Recommendation X.710 (1997), Information technology - Open SystemsInterconnextion - Common managem
26、ent information service. ITU-T Recommendation X.711 (1997), Information technology - Open SystemsInterconnextion - Common management information protocol : Specification. ITU-T Recommendation X.720 (1992) and Amd.1 (95) and Corr.1 (94), Informationtechnology - OSI - Structure of Management Informati
27、on: Management information model. ITU-T Recommendation X.721 (1997), Information technology - Open SystemsInterconnection - Structure of management information : Definition of managementinformation. ITU-T Recommendation X.722 (1992) and Amd.1 (95), Amd.2 (97), Amd.2 (97) andCorr.1 (96), Information
28、technology - OSI - Structure of management information:Guidelines for the definition of managed objects. ITU-T Recommendation X.730 (1992) and Amd.1 (95) and Corr.1, Amd.1 (96),Information technology - OSI - Structure of management information: Object managementfunction. ITU-T Recommendation X.731 (
29、1992) and Amd.1 (95), Corr.1 (95) and Corr.1, Amd.1(96), Information technology - OSI - Structure of management information: Statemanagement function.ITU-T G.774.6 (02/2001) Prepublished version 3 ITU-T Recommendation X.733 (1992) and Corr.1 (94), Amd.1 (95), Corr.1, Amd.1 (96)and Corr.2 (99), Infor
30、mation technology - OSI - Structure of management information:Alarm reporting function. ITU-T Recommendation X.734 (1992) and Corr.1 (94), Amd.1 (95), Corr.1, Amd.1 (96)and Corr.2 (99), Information technology - OSI - Structure of management information:Event report management function. ITU-T Recomme
31、ndation X.735 (1992) and Amd.1 (95) and Corr.1, Amd.1 (96),Information technology - OSI - Structure of management information: Log control function. ANSI T1.231-1997 - American National Standard for Telecommunications - DigitalHierarchy - Layer 1 In-Service Digital Transmission Performance Monitorin
32、g. ITU-T Recommendation X.739 (1993), Information technology - Open SystemsInterconnection - Systems Managemen: Metric objects and attributes.3 Terms and DefinitionsThis Recommendation uses the terms and definitions defined in Recommendations G.784, G.774and M.3100.4 AbbreviationsFor the purpose of
33、this Recommendation, the following abbreviations are used:AIS Alarm Indication SignalBBE Background Block ErrorCSES Consecutive Severely Errored SecondCTP Connection Termination PointEBER Excessive Bit Error RatioES Errored SecondFEBBE Far-End Background Block ErrorFEEB Far-End Errored BlockFEES Far
34、-End Errored SecondFESES Far-End Severely Errored SecondISO International Organization for StandardizationITU International Telecommunication UnionLOF Loss Of FrameLOS Loss Of SignalMS Multiplex SectionNCSES Number of Consecutive Severely Errored SecondsNE Network ElementOS Operations SystemOSI Open
35、 Systems InterconnectionPkg PackageQOS Quality of ServiceRDN Relative Distinguished NameITU-T G.774.6 (02/2001) Prepublished version 4RS Regenerator SectionSDH Synchronous Digital HierarchySES Severely Errored SecondSPI Synchronous Physical InterfaceSTM-N Synchronous Transport Module NTMN Telecommun
36、ications Management NetworkTP Termination PointTR Threshold ResetTTP Trail Termination PointUAS Unavailable Second5 Performance Management Model5.1 OverviewThis subclause provides Managed Objects required to support management of unidirectionalperformance monitoring in SDH Network Elements.This mode
37、l defines subclasses of the generic currentData and historyData object classes fromRecommendation Q.822 for each kind of monitoring point. For each type of monitoring point, twosubclasses of currentData are defined. One is defined for either a 15-minute count or 1-day countperiod, and provides impli
38、cit clearing of threshold crossing alarms at the end of each granularityperiod. The other subclass is only relevant to 15-minute counting and performs explicit clearing ofthreshold alarms (Threshold Reset) at the end of a clear 15-minute period (refer to 2.3.4.2/M.2120).History information could eit
39、her be collected as part of historyData instances or one of itssubclasses or as an eventRecord or one of its subclasses contained in a log. Utilization of a log isnot mandatory in this Recommendation.The threshold reset (TR) mechanism used in this Recommendation corresponds to the resetthreshold rep
40、ort (RTR) of G.784.5.2 RequirementsThe unidirectional SDH Performance Monitoring functions shall provide for: the ability for a managing system to request the collection of the various Performanceevents relating to a given monitored entity for a given collection period; the ability for a managing sy
41、stem to suspend/resume the performance data collection for agiven monitored entity (or set of entities); the ability for a managing system to instruct the NE to reset the performance monitoringcounters for a given monitored entity (or set of entities); the scheduling of performance collection activi
42、ty within specified time periods, for a givenmonitored entity (or set of entities); the ability for a managing system to request the performance monitoring counters for agiven monitored entity (or set of entities); the ability for a managed system to send event reports to a managing system to notify
43、 theresults of the performance data collection, at the end of the collection period;ITU-T G.774.6 (02/2001) Prepublished version 5 the ability for a managing system to instruct the NE to maintain Performance historical datafor a specified duration, under specified conditions; the ability for a manag
44、ing system to instruct the NE to remove specific Performancehistorical data; the ability for a managing system to instruct the NE to establish thresholding criteria for agiven monitored entity (or set of entities); the ability for a managed system to send Quality Of Service Alarms upon thresholdviol
45、ation of a performance counter of a monitored entity.In order to fulfil the needs for maintenance-based collection and error performance-basedcollection, the following register sets are required for performance management evaluation:Starting and ending of a unidirectional unavailability period has t
46、o be reported by the instance of themanaged object class that hold the 24-hour counts (near end or far end).Maintenance-based collection for Regenerator SectionsThe detailed definitions for the required parameters are included in Recommendation G.784. Whilethe optional requirements are defined in ei
47、ther Recommendation G.784 or ANSI Standard T1.231.These requirements are covered by this Recommendation.Required Register sets are: 17 (16+1) 15-minute near-end registers for BBE, ES, and SES;2 (1+1) 24-hour near-end registers unidirectional for BBE, ES, and SES.Optional Register sets are: 17 (16+1)
48、 15-minute near-end registers for ESA, ESB, OFS (SEFS) and UAS;2 (1+1) 24-hour near-end registers unidirectional for ESA, ESB, OFS (SEFS) and UAS.Maintenance-based collection for Paths and Multiplex SectionsThe detailed definitions for the required parameters are included in Recommendation G.784, wh
49、ilethe optional requirements are defined in either Recommendation G.784 or ANSI Standard T1.231.These requirements are covered by this Recommendation.Required Register sets are: 17 (16+1) 15-minute near-end registers for BBE, ES, and SES; 17 (16+1) 15-minute far-end registers for BBE, ES, and SES;2 (1+1) 24-hour near-end registers unidirectional for BBE, ES, and SES; 2 (1+1) 24-hour far-end registers unidirectional for BBE, ES, and SES.Optional Register sets are: 17 (16+1) 15-minute near-end registers for ESA, ESB, FC and UAS; 1
