1、INTERNATIONAL TELECOMMUNICATION UNIONITU-TG.774.9TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU(02/2001)SERIES G: TRANSMISSION SYSTEMS AND MEDIA,DIGITAL SYSTEMS AND NETWORKSDigital terminal equipments Operations, administrationand maintenance features of transmission equipmentSynchronous Digital Hier
2、archy (SDH)configuration of linear multiplex sectionprotection for the network 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 bedifferen
3、ces between this 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
4、studying technical, 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 gro
5、ups which, in 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
6、and IEC.NOTEIn 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 Recommendati
7、on mayinvolve 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 th
8、is Recommendation, 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 da
9、tabase. ITU 2001All 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.774.9 (02/2001) Prepublished version 1Recommendation G.774.09“Sync
10、hronous Digital Hierarchy (SDH) configuration of linear multiplex sectionprotection for the network element view”SummaryThis Recommendation provides an information model for the Synchronous Digital Hierarchy (SDH)Network. This model describes the managed object classes and their properties for the c
11、onfigurationof the protection switching function, as defined in Recommendations G.805 and G.774.3 and asrelated to SDH transmission resources. These objects are useful to describe information exchangedacross interfaces defined in M.3010 Telecommunications Management Network (TMN)architecture for the
12、 configuration of the protection function. The protection switching scheme of anSDH network element is usually set up autonomously by the network element according to itsmake-up and mode of operation. When this is not possible, the information model defined by thisRecommendation will be used. Post-c
13、onfiguration management of the protection function isdescribed in Recommendation G.774.3.1. ScopeRecommendation G.774.3 defines an information model for management of fixed linear MultiplexSection Protection (MSP) groups. This Recommendation defines the object model that allows toconfigure flexible
14、linear MSP groups in accordance with the requirements described inRecommendation G.784. This model can be used to establish, modify and remove MSP groups forNetwork Elements that require external provisioning to configure their protection switchingschemes. The protection switching scheme of an SDH n
15、etwork element is usually set upautonomously by the network element according to its make-up and mode of operation. When thisis not possible, the information model defined by this Recommendation will be used. Post-configuration control of the protection function is carried out by means of the object
16、 model definedin Recommendation G.774.3.Structure of this RecommendationSubclause 5.1 provides an overview of the SDH protection configuration information model.Clauses 6-15 describe the information model using the notation mechanisms defined inRecommendation X.722 Guidelines for the Definition of M
17、anaged Objects. Clause 15 contains thesyntax definitions of the information carried in the protocol using Abstract Syntax Notation One(ASN.1) defined in Recommendation X.680-683. Naming and Inheritance are illustrated inAppendix I. Clauses 5-15 are normative; all other text is informative.2. Referen
18、cesThe 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 ofthi
19、s Recommendation 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 G.774.9 (02/2001) Prepublished version 2 ITU-T Recomme
20、ndation G.707 (2000), Network-node interface for the synchronous digitalhierarchy. ITU-T Recommendation G.773 (1993), Q-Interface protocols ITU-T Recommendation G.774 (2000), SDH management information model for the networkelement view. ITU-T Recommendation G.783 (1998), Characteristics of Synchrono
21、us Digital Hierarchy(SDH) equipment functional blocks. ITU-T Recommendation G.784 (1999), Synchronous Digital Hierarchy (SDH) management. ITU-T Recommendation G.803 (1997), Architectures of transport networks based on thesynchronous digital hierarchy (SDH). ITU-T Recommendation G.831 (1996), Managem
22、ent capabilities of transport networks basedon the synchronous digital hierarchy (SDH). ITU-T Recommendation G.958 (1994), Digital line systems based on SDH for use on opticalfibre cables. ITU-T Recommendation M.60 (1993), Maintenance terminology and definitions. ITU-T Recommendation M.2120 (1997),
23、Digital path, section and transmission system faultdetection and localisation procedures. ITU-T Recommendation M.3010 (2000), Principles for a telecommunication managementnetwork. ITU-T Recommendation M.3013 (2000), Considerations for a TelecommunicationsManagement Network. ITU-T Recommendation M.31
24、00 (1995), Generic network information model. ITU-T Recommendation Q.811 (1990), Q3-Lower layers protocols. ITU-T Recommendation Q.812 (1990), Q3-Higher layers protocols. ITU-T Recommendation Q.822 (1993), Stage 1, Stage 2 and Stage 3 description for theQ3-interface: performance management. ITU-T Re
25、commendation X.680 - X.683 (1997), Specification of Abstract Syntax Notation One(ASN.1). ITU-T Recommendation X.701(1997), Systems management overview. ITU-T Recommendation X.710 (1997), Common management information service. ITU-T Recommendation X.711(1997), Common management information protocol.
26、ITU-T Recommendation X.720 (1992) and Amd.1 (95) and Corr.1 (94), Information technology OSI Structure of Management Information: Management information model. ITU-T Recommendation X.721 (1993) and Corr. 1, 2, 3, and 4, Definition of managementinformation. ITU-T Recommendation X.722 (1992) and Amd.1
27、 (95), Amd.2 (97), Amd.2 (97) and Corr.1(96), Information technology OSI Structure of management information: Guidelines for thedefinition of managed objects. ITU-T Recommendation X.731 (1992) and Amd.1 (95), Corr.1 (95) and Corr1Amd1 (96), Statemanagement function. ITU-T Recommendation X.730 (1992)
28、 and Amd.1 (95) and Corr1Amd1 (96), Objectmanagement function.ITU-T G.774.9 (02/2001) Prepublished version 3 ITU-T Recommendation X.733 (1992) and Corr.1 (94), Amd1 (95), Corr1Amd1 (96) andCorr.2 (99), Alarm reporting function. ITU-T Recommendation X.734 (1992) and Corr.1 (94), Amd1 (95), Corr1Amd1
29、(96) andCorr.2 (99), Event report management function. ITU-T Recommendation X.735 (1992) and Amd.1 (95) and Corr1Amd1 (96), Log controlfunction.3. Terms and DefinitionsThis Recommendation uses the terms and definitions defined in Recommendations G.784, G.774and M.3100.4. AbbreviationsFor the purpose
30、 of this Recommendation, the following abbreviations are used:APDU Application Protocol Data UnitAPS Automatic Protection SwitchingCMIP Common Management Information ProtocolCMIS Common Management Information ServiceCTP Connection Termination PointISO International Organization for StandardizationIT
31、U International Telecommunication UnionLOS Loss of SignalMS Multiplex SectionMSP Multiplex Section ProtectionNE Network ElementOS Operations SystemOSI Open Systems InterconnectionPkg PackageRDN Relative Distinguished NameSDH Synchronous Digital HierarchySF Signal FailSTM-N Synchronous Transport Modu
32、le NTMN Telecommunications Management NetworkTP Termination PointTTP Trail Termination PointWTR Wait-to-RestoreITU-T G.774.9 (02/2001) Prepublished version 45. Multiplex-Section Protection configuration management model5.1 OverviewRecommendation G.774.3 defines a generic model for protection schemes
33、 and the specific modelfor SDH MS protection. The model defined in G.774.3 allows full operation and control of the MSprotection function for Network Elements that set up autonomously their protection switchingschemes, according to their make-up and mode of operation.Some Network Elements, due to eq
34、uipment flexibility, require external provisioning to determinethe configuration of their MS protection schemes, particularly as to the definition of the linesparticipating in the protection.This clause provides Managed Objects to support configuration of MS protection groups in SDHNetwork Elements.
35、This model is a compatible extension that supports external creation and deletion of SDH MSprotection groups and units to the model defined in Recommendation G.774.3.5.2 RequirementsThe information model defined in this Recommendation is based on the same approach as used inRecommendation G.774.3 th
36、at identifies generic objects to support general protection functionalrequirements plus specific subclasses for the particular purposes of Multiplex Section Protection.The functional requirements for configuration management of Multiplex Section Protection groupsmay be found in Recommendation G.784.
37、5.2.1 Generic protection configuration requirementsThe general functional requirements for the configuration of protection schemes are: the ability for a managing system to establish a protection scheme, indicating the protectionmode (revertive/non revertive), the entities participating in the prote
38、ction, their role(protecting/protected), and possibly their priority;1 the ability for a managing system to modify a protection scheme, adding or removingentities and/or modifying their protection characteristics (role and priority); the ability for a managing system to suppress a protection scheme.
39、5.2.2 Specific SDH MS linear protection configuration requirementsThe specific functional requirements for the configuration of SDH MS protection schemes are: the ability for a managing system to specify the type of protection(unidirectional/bidirectional) and to enable or disable the K1, K2 protoco
40、l whenestablishing a protection scheme;1 the ability for a managing system to specify the channel number and priority (high/low)associated to each protection line and optionally control extra-traffic on each protection linewhen establishing or modifying a protection scheme.1_1These parameters can be
41、 configured when establishing the protection scheme. Subsequentmodifications may be achieved by using Recommendation G.774.3.ITU-T G.774.9 (02/2001) Prepublished version 55.3 Model overviewThe information model specified in this Recommendation defines a generic object(protectionCoordinator) that inc
42、ludes the actions (namely establishProtection, modifyProtection,dismissProtection), necessary to configure a generic protection scheme.A subclass of protectionCoordinator (sdhMSProtectionCoordinator) is then defined for the specificpurposes of SDH MS Protection configuration. Such object class inher
43、its all of the actions andbehavior defined in the protectionCoordinator superclass and specifies the additional informationneeded to establish or modify a protection scheme in the particular case of SDH MSP.6. Managed Object Class definitions6.1 Protection CoordinatorprotectionCoordinator MANAGED OB
44、JECT CLASSDERIVED FROM “Recommendation X.721”:top;CHARACTERIZED BYprotectionCoordinatorPkg PACKAGEBEHAVIOUR protectionCoordinatorBeh;ATTRIBUTESprotectionCoordinatorId GET;ACTIONSestablishProtection protectionConfigurationError,dismissProtection removeProtectionError,modifyProtection protectionConfig
45、urationErrorremoveProtectionError;REGISTERED AS g774-09MObjectClass 1;protectionCoordinatorBeh BEHAVIOURDEFINED AS*This object class allows the management system to configure the protection schemes of a network element.Instances of this class or of its subclasses are created at system start-up and c
46、an never be deleted.*;6.2 SDH MS Protection CoordinatorsdhMSProtectionCoordinator MANAGED OBJECT CLASSDERIVED FROM protectionCoordinator;CHARACTERIZED BYsdhMSProtectionCoordinatorPkg PACKAGEBEHAVIOUR sdhMSProtectionCoordinatorBeh;ACTIONSestablishProtection mSPGroupConfigurationParametermSPUnitConfig
47、urationParametermSPConfigurationError,modifyProtection mSPUnitConfigurationParametermSPConfigurationError;REGISTERED AS g774-09MObjectClass 2;sdhMSProtectionCoordinatorBeh BEHAVIOURDEFINED AS*This object class is used specifically to configure SDH MS protection schemes. Only one instance can be crea
48、ted inone NE.When the establishProtection action is successfully performed one sdhMSProtectionGroup instance and asmany sdhMSProtectionUnit instances are created as specified by the action information. TheunreliableResourcePointer of each sdhMSProtectionUnit will point to the unprotectedCTP indicate
49、d bythe unreliableObjects field of the action information. The reliableResourcePointer will point to theprotectedTTP connected to the unprotectedCTP, unless the protectionUnit is protecting and extra-traffic is not required or not supported. In this case the reliableResourcePointer is NULL.ITU-T G.774.9 (02/2001) Prepublished version 6UnprotectedCTPs and protectedTTPs are anyhow instantiated for sections which can potentially beincluded in a protection group irrespective whether protection is actually present
