1、INTERNATIONAL TELECOMMUNICATION UNIONITU-TG.774.5TELECOMMUNICATIONSTANDARDIZATION 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)management of connection supervisionfunctionality (HCS/LCS) for the network elementviewCAUTION !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 bed
3、ifferences 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 responsib
4、le for 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 st
5、udy groups 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 wi
6、th ISO 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 Recom
7、mendation 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 approva
8、l of this 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 strongly urgedto consult the TSB pa
9、tent database. 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.774.5 (02/2001) Prepublished version 1RECOMMENDATION G.774.
10、05“SYNCHRONOUS DIGITAL HIERARCHY (SDH)MANAGEMENT OF CONNECTION SUPERVISION FUNCTIONALITY(HCS/LCS) 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 proper
11、ties for the managementof Connection Supervision Functionality (HCS/LCS), as defined in Recommendation G.783 2 andas related to SDH network Elements. These objects are useful to describe information exchangedacross interfaces defined in M.3010 5 Telecommunications Management Network (TMN)architectur
12、e.1. ScopeSDH Connection Supervision Functions are used to configure the supervision of higher and lowerorder path overhead independent from termination functions.Configuration is done by modifications of attributes of the relevant managed objects. Theseattributes are included by subclassing of exis
13、ting G.774 managed object Classes.The new objects defined in this Recommendation supersede those defined inRecommendation G.774.05 (1995). For each object class, attribute, action, notification, parameterdefined in this Recommendation it shall be indicated what the impacts upon the existingRecommend
14、ation G.774.05 (1995) are.Structure of this RecommendationSubclause 5.1 provides an overview of the SDH Connection Supervision information model. Clauses6 to 12 describe the information model using the mechanisms defined in X.722. Clause 15 containsthe syntax definitions of the information carried i
15、n the protocol using Abstract Syntax Notation One(ASN.1) defined in X.680 X.683. Naming and Inheritance are illustrated in informative AppendixI. Clauses 5 to 15 are normative; all other text is informative.2. ReferencesThe following Recommendations and other references contain provisions which, thr
16、ough 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 Recommendation are therefore encouraged to investigate the possibility of applyin
17、g the mostrecent edition of the Recommendations and other references listed below. A list of the currently validITU-T Recommendations is regularly published. ITU-T Recommendation G.707 (2000), Network-node interface for the synchronous digitalhierarchy. ITU-T Recommendation G.773 (1993), Q-Interface
18、 protocols. ITU-T Recommendation G.774 (2000), SDH management information model for the networkelement view. ITU-T Recommendation G.783 (1998), Characteristics of Synchronous Digital Hierarchy(SDH) equipment functional blocks.ITU-T G.774.5 (02/2001) Prepublished version 2 ITU-T Recommendation G.784
19、(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), Management capabilities of transport networks based onthe synchronous digital hierarchy (
20、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), Digital path, section and transmission system faultdetection and localisation proc
21、edures. 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.3100 (1995), Generic network information model. ITU-T Recommendation Q.811 (1990), Q
22、3-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 Recommendation X.680 - X.683 (1997), Specification of Abstract Syntax Notation One(A
23、SN.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. ITU-T Recommendation X.720 (1992) and Amd.1 (95) and Corr.1 (94), Information tech
24、nology 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 (95), Amd.2 (97), Amd.2 (97) and Corr.1(96), Information technology OSI Structure
25、 of management information: Guidelines for thedefinition of managed objects. ITU-T Recommendation X.730 (1992) and Amd.1 (95) and Corr1Amd1 (96), Objectmanagement function. ITU-T Recommendation X.731 (1992) and Amd.1 (95), Corr.1 (95) and Corr1Amd1 (96), Statemanagement function. ITU-T Recommendatio
26、n X.733 (1992) and Corr.1 (94), Amd1 (95), Corr1Amd1 (96) and Corr.2(99), Alarm reporting function. ITU-T Recommendation X.734 (1992) and Corr.1 (94), Amd1 (95), Corr1Amd1 (96) and Corr.2(99), Event report management function. ITU-T Recommendation X.735 (1992) and Amd.1 (95) and Corr1Amd1 (96), Log
27、controlfunction.ITU-T G.774.5 (02/2001) Prepublished version 33. Terms and DefinitionsThis Recommendation uses the terms and definitions defined in Recommendations G.784, G.774and M.3100.4. AbbreviationsFor the purpose of this Recommendation, the following abbreviations are used:AIS Alarm Indication
28、 SignalCTP Connection Termination PointEBER Excessive Bit Error RatioFERF Far End Receive FailureHCS Higher Order Connection SupervisionHPA Higher Order Path AdaptationLCS Lower Order Connection SupervisionNE Network ElementMSA Multiplex Section AdaptationOS Operations SystemSDH Synchronous Digital
29、HierarchyTMN Telecommunications Management NetworkTTP Trail Termination PointVC Virtual Container5. Connection supervision information model5.1 Overview5.1.1 HCS and LCS may be provided in the case of an open HPC respective LPC (unusedconnection). This case is modelled by connected AU3/4CTP respecti
30、ve TUxCTP. Therefore: the HCS is modelled by “supervisedAU3/4CTP”. These classes are subclasses of AU3/4CTPof G.774 which currently model only the MSA function; the LCS is modelled by “supervisedTU3/2/12/11CTP”. These classes are subclasses ofTU3/2/12/11CTP of G.774 which currently model only the HP
31、A function.5.1.2 If an instance of an AU3/4CTP or TUxCTP has to be created (only possible as aconsequence of the creation of a superior TTP or as a side effect of payload configuration see Recommendation G.774.02) and the equipment is able to provide HCS/LCS functionality (seeR3.), instead of (Recom
32、mendation G.774) CTPs, the supervised CTPs should be createdautomatically.5.1.3 The (de-)activation of HCS/LCS is modelled using the attribute generatorEnabled for theunequipped generator subfunction and the attribute monitorActive for the path overhead monitorsubfunction. These attributes allow the
33、 independent management of both subfunctions (requirementR4.).5.1.4 The (de-)activation of HCS/LCS in the supervised CTP objects does not influence thebehaviour derived from Recommendation G.774 (MSA, HPA). A SET-operation ofgeneratorEnabled or of monitorActive to TRUE may be rejected depending upon
34、 the dynamicITU-T G.774.5 (02/2001) Prepublished version 4situation of the specific network element if it supports the connection supervision function with lessthan 100%. This results from requirement R5.5.1.5 Performance measurement of the connection supervision functionality of supervised CTPs(Sin
35、k or Bidirectional) can be done using a subclass of currentData which is applicable for pathtermination (see Recommendation G.774.01). This subclass provides the parameters backgroundblock errors, errored seconds, severely errored seconds and unavailable seconds (some are optionaland are also provid
36、ed for the far end). If the attribute monitorActive of a CTP has the value FALSEduring a part of a PM period the performance data is not reliable. This should be indicated by theattribute suspectIntervalFlag in the currentData object.5.2 RequirementsThe features of HCS/LCS (defined in Recommendation
37、 G.783) which influence the modellingapproach are summarized below:R1 The connection supervision function includes the monitoring of parts of HO/LO-POH to getalarms and performance information about the path segment sub function H/L-POM (PathOverhead Monitor).R2 The connection supervision function i
38、ncludes the generation of supervisory unequippedHO/LO-POH with a Path Trace sub function H/L-UG (Unequipped Generator).R3 The connection supervision function may be optional.R4 The connection supervision function shall be able to be set into the INACTIVE state and theACTIVE state (independent for HP
39、OM and HUG respective LPOM and LUG).R5 The connection supervision function may be supported for a specific equipment at the sametime in the range of 0% to 100%.6. Object classesThis clause provides replacement managed object class definitions for the existing RecommendationG.774.05 (1995). Any manag
40、ed object class replaced by one in this clause is considered to bedeprecated. The reasons for the replacement of a managed object class are as follows:1) The replaced managed object class is faulty and must be fixed.2) The replaced managed object class includes an attribute, package, notification or
41、 actionwhich has been re-registered in this or another Recommendation.3) The replaced managed object class inherits from a managed object class which has been re-registered in this or another Recommendation.In each case where a class is replaced the new class will be registered within this Recommend
42、ation.The textual label for the class will be revised to include the text “R1“. For example in the revision ofthe G.774.05 (1995) managed object class “au4SupervisedCTPBidirectional“, the revised label willbecome “au4SupervisedCTPBidirectionalR1“.Below is a table of classes deprecated from Recommend
43、ation G.774.05 (1995) and the G.774.05classes which replace them:Deprecated G.774.05 (1995) Classes Replacement G.774.05 Classesau4SupervisedCTPBidirectional au4SupervisedCTPBidirectionalR1au4SupervisedCTPSink au4SupervisedCTPSinkR1au3SupervisedCTPBidirectional au3SupervisedCTPBidirectionalR1au3Supe
44、rvisedCTPSink au3SupervisedCTPSinkR1tu3SupervisedCTPBidirectional tu3SupervisedCTPBidirectionalR1tu3SupervisedCTPSink tu3SupervisedCTPSinkR1tu2SupervisedCTPBidirectional tu2SupervisedCTPBidirectionalR1ITU-T G.774.5 (02/2001) Prepublished version 5tu2SupervisedCTPSink tu2SupervisedCTPSinkR1tu12Superv
45、isedCTPBidirectional tu12SupervisedCTPBidirectionalR1tu12SupervisedCTPSink tu12SupervisedCTPSinkR1tu11SupervisedCTPBidirectional tu11SupervisedCTPBidirectionalR1tu11SupervisedCTPSink tu11SupervisedCTPSinkR16.1 Administrative Unit 4 CTP Bidirectional with HCSau4SupervisedCTPBidirectionalR1 MANAGED OB
46、JECT CLASSDERIVED FROM “Recommendation G.774“:au4CTPBidirectionalR1,au4SupervisedCTPSinkR1,au4SupervisedCTPSource;CHARACTERIZED BYvc3-4SupervisionBidirectionalPackage;REGISTERED AS g774-05MObjectClass 19 ;6.2 Administrative Unit 4 CTP Sink with HPOMau4SupervisedCTPSinkR1 MANAGED OBJECT CLASSDERIVED
47、FROM “Recommendation G.774“:au4CTPSinkR1;CHARACTERIZED BYvc3-4SupervisionSinkPackageR1;REGISTERED AS g774-05MObjectClass 20 ;6.3 Administrative Unit 4 CTP Source with HUGau4SupervisedCTPSource MANAGED OBJECT CLASSDERIVED FROM “Recommendation G.774“: au4CTPSource;CHARACTERIZED BYvc3-4SupervisionSourc
48、ePackage;REGISTERED AS g774-05MObjectClass 3;6.4 Administrative Unit 3 CTP Bidirectional with HCSau3SupervisedCTPBidirectionalR1 MANAGED OBJECT CLASSDERIVED FROM “Recommendation G.774“:au3CTPBidirectionalR1,au3SupervisedCTPSinkR1,au3SupervisedCTPSource;CHARACTERIZED BYvc3-4SupervisionBidirectionalPa
49、ckage;REGISTERED AS g774-05MObjectClass 21 ;6.5 Administrative Unit 3 CTP Sink with HPOMau3SupervisedCTPSinkR1 MANAGED OBJECT CLASSDERIVED FROM “Recommendation G.774“:au3CTPSinkR1;CHARACTERIZED BYvc3-4SupervisionSinkPackageR1;REGISTERED AS g774-05MObjectClass 22 ;6.6 Administrative Unit 3 CTP Source with HUGau3SupervisedCTPSource MANAGED OBJECT CLASSITU-T G.774.5 (02/2001) Prepublished version 6DERIVED FROM “Recommendation G.774“: au3CTPSource;CHARACTERIZED BYvc3-4SupervisionSourcePackage;REGISTERED AS g774-05MObjectC
