ITUTJ291Next generation settopbox cable architecture.docx

ITUTJ291Next generation settopbox cable architecture.docx

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ITUTJ291Nextgenerationsettopboxcablearchitecture

InternationalTelecommunicationUnion

ITU-T

J.291

TELECOMMUNICATION

STANDARDIZATIONSECTOR

OFITU

（11/2006）

SERIESJ:

CABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALS

Cablemodems

Nextgenerationset-top-boxcablearchitecture

ITUTRecommendationJ.291

ITU-TRecommendationJ.291

Nextgenerationset-top-boxcablearchitecture

Summary

ThisRecommendationdescribesthecablenetworkarchitecturecomponentofthenext-generationSet-Top-Box（STB）.WhencombinedwithcompanionITU-TRecsJ.290（J.stb-core-a）andJ.292（J.stb-mi-a）,thearchitecturedefinesacost-efficientplatformwithcapacityandflexibilitytosupportgrowthofon-demandvideo,highdefinitiondigitalTV,managedin-homenetworksconnectingawiderangeofconsumer-provideddevices,andfutureIPmultimediaservicesincludingIPvoice,videotelephony,andmultiplayergaming.ThisRecommendationreflectskeyfunctionalaspectsofthenextgenerationcableset-top-box,suchasacommonapplicationplatformandMPEGtransportincludingadvancedcodecs.

Source

ITUTRecommendationJ.291wasapprovedon29 November 2006byITUTStudyGroup 9（20052008）undertheITUTRecommendation A.8procedure.

FOREWORD

TheInternationalTelecommunicationUnion（ITU）istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector（ITU-T）isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.

TheWorldTelecommunicationStandardizationAssembly（WTSA）,whichmeetseveryfouryears,establishesthetopicsforstudybytheITUTstudygroupswhich,inturn,produceRecommendationsonthesetopics.

TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution 1.

InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.

NOTE

InthisRecommendation,theexpression"Administration"isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.

CompliancewiththisRecommendationisvoluntary.However,theRecommendationmaycontaincertainmandatoryprovisions（toensuree.g.interoperabilityorapplicability）andcompliancewiththeRecommendationisachievedwhenallofthesemandatoryprovisionsaremet.Thewords"shall"orsomeotherobligatorylanguagesuchas"must"andthenegativeequivalentsareusedtoexpressrequirements.TheuseofsuchwordsdoesnotsuggestthatcompliancewiththeRecommendationisrequiredofanyparty.

INTELLECTUALPROPERTYRIGHTS

ITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.

AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementersarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabaseathttp:

//www.itu.int/ITU-T/ipr/.

  ITU  2007

Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.

CONTENTS

Page

1Scope1

2References1

2.1Normativereferences1

2.2Informativereferences1

3Termsanddefinitions2

4AbbreviationsandAcronyms3

5Integratedmultimediaarchitecture4

5.1Referencearchitecturedescription4

5.2Attributesofanintegratedmultimediaarchitecture4

5.3Videoservicesarchitecture6

5.4DOCSISsignalling7

5.5Useofcoaxforin-homenetworking8

5.6Telemetryservices9

6Customerpremises9

6.1SubscriberVideoDevices（SVDs）10

7Head-endnetworkarchitecture10

7.1EvolutionoftheDOCSISCMTSandQAMmodulators13

7.2Sessionandresourcemanagementarchitecture15

AppendixI–Businessrequirementsforthecablenetworkarchitecture18

ITU-TRecommendationJ.291

Nextgenerationset-top-boxcablearchitecture

1Scope

ThisRecommendationdescribesthecablenetworkarchitecturecomponentofthenext-generationSTB.WhencombinedwithcompanionITU-TRecsJ.290andJ.292,thearchitecturedefinesacost-efficientplatformwithcapacityandflexibilitytosupportgrowthofon-demandvideo,highdefinitiondigitalTV,managedin-homenetworksconnectingawiderangeofconsumer-provideddevices,andfutureIPmultimediaservicesincludingIPvoice,videotelephony,andmultiplayergaming.

2References

2.1Normativereferences

None.

2.2Informativereferences

–ITU-TRecommendationJ.83（1997）,Digitalmulti-programmesystemsfortelevision,soundanddataservicesforcabledistribution.

–ITU-TRecommendationJ.94（1998）,Serviceinformationfordigitalbroadcastingincabletelevisionsystems.

–ITU-TRecommendationJ.112（1998）,Transmissionsystemsforinteractivecabletelevisionservices.

–ITU-TRecommendationJ.122（2002）,Second-generationtransmissionsystemsforinteractivecabletelevisionservices –IPcablemodems.

–ITU-TRecommendationJ.125（2004）,Linkprivacyforcablemodemimplementations.

–ITU-TRecommendationJ.126（2004）,EmbeddedCableModemdevicespecification.

–ITU-TRecommendationJ.128（2005）,Set-topgatewayspecificationfortransmissionsystemsforinteractivecabletelevisionservices.

–ITU-TRecommendationJ.179（2005）,IPCablecomsupportformultimedia.

–ITU-TRecommendationJ.197（2005）,HighlevelrequirementsforaDigitalRightsManagement（DRM）bridgefromacableaccessnetworktoahomenetwork.

–ITU-TRecommendationJ.200（2001）,Worldwidecommoncore–Applicationenvironmentfordigitalinteractivetelevisionservices.

–ITU-TRecommendationJ.201（2004）,Harmonizationofdeclarativecontentformatforinteractivetelevisionapplications.

–ITU-TRecommendationJ.202（2005）,HarmonizationofproceduralcontentformatsforinteractiveTVapplications.

3Termsanddefinitions

ThisRecommendationdefinesthefollowingterms:

3.1asynchronoustimedivisionmultipleaccess（A-TDMA）:

Avariantontheprotocolforwirelesscommunication,usedinDOCSIS2.0.

3.2cablemodemterminationsystem（CMTS）:

Locatedatthecabletelevisionsystemheadendordistributionhub,whichprovidescomplementaryfunctionalitytothecablemodemstoenabledataconnectivitytoawide-areanetwork.

3.3downloadableconditionalaccesssystem（DCAS）:

Atechnologyfordownloadingconditionalaccessintosoftwareonaset-topbox;thisisaneffortunderwayatCableLabsanddueforpublicationin2006.

3.4DOCSISsignalling:

DOCSISsignallingasdefinedinITU-TRecsJ.125andJ.126.DOCSISisthetermforasystemordevicecompliantwithanyoneoftheCableTelevisionLaboratories,Inc.（"CableLabs"）seriesofspecificationslocatedat:

3.5DSG:

TheDOCSISSet-topGatewayisaninterfacedefiningsignallingtoandfromaDOCSISmodemembeddedinacableset-topdevice.

3.6Digitalstoragemediacommandandcontrol（DSM-CC）:

DSM-CCisfordevelopingcontrolchannelsassociatedwithMPEG2streams.

3.7EdgeQAM:

AdevicethatprovidesQAMmodulationtoincreasecapacityinexistinglegacycablenetworks.

3.8IPCable2Home:

ThedomaininMediaHomeNetthatiswellboundedandspecifiedbasedonInternetProtocolLayer3interoperability,asopposedtootherdomainsthatcanbeindependently,arbitrarily,orprivatelydesignedtoanindividualmanufacturer'sspecification.

3.9IPCablecom:

AnITU-TprojectthatincludesanarchitectureandaseriesofRecommendationsthatenablethedeliveryofreal-timeservicesoverthecabletelevisionnetworksusingcablemodems.

3.10J.200series:

ITU-TRecommendationforWorldwidecommoncore –Applicationenvironmentfordigitalinteractivetelevisionservices.J.200isthecommoncoreunderlyingOpenCableApplicationsPlatform（OCAP）intheUnitedStates.

3.11mediagatewaycontrolprotocol（MGCP）:

AprotocolusedwithinaVoiceoverIPsystem.

3.12multiprogramtransportstream（MPTS）:

Atransportstreamwithmultipleprograms.

3.13OpenCableApplicationsPlatform（OCAP）:

ThemiddlewarestandardforUnitedStatescableset-tops;J.200WorldwidecommoncoreisapartofOCAP.

3.14packetidentifier（PID）:

Uniqueintegervalueusedtoidentifyelementarystreamsofaprograminasingle-ormulti-programMPEG-2stream.

3.15realtimetransportprotocol（RTP）:

Atransportprotocolforreal-timeapplicationsdefinedinITUTRec.H.225.0.Itisdesignedforreal-timetransmissionofaudioandvideodata.

3.16SynchronousCodeDivisionMultipleAccess（S-CDMA）:

Avariantoftheprotocolusedforwirelesscommunication,usedinDOCSIS2.0.

3.17sessioninitiationprotocol（SIP）:

Anapplication-layercontrol（signalling）protocolforcreating,modifying,andterminatingsessionswithoneormoreparticipants.ThesesessionsincludeInternettelephonecalls,multimediadistribution,andmultimediaconferences.

3.18simpleobjectaccessprotocol（SOAP）:

Alightweight,XML-basedprotocolforexchangeofinformationinadecentralized,distributedenvironment.

3.19singleprogramtransportstream（SPTS）:

Atransportstreaminwhichthereisasingleprogram.

3.20telemetryservice:

Remotemonitoringofdataforpurposessuchasenergymanagementorsecur