ANSI CTA-851-A-2006 Versatile Home Network (Formerly ANSI CEA-851-A).pdf

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1、 ANSI/CEA Standard Versatile Home Network ANSI/CEA-851-A July 2006 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating in

2、terchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA

3、 from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used

4、either domestically or internationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation

5、 whatever to parties adopting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA

6、Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the

7、applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEAs R7 Home Network Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2006 Technology CEBus uses the CAL language for control. CIM Common Information Model is the schema of the overall managed en

8、vironment. It is divided into a Core model, Common model and extended schemas. CIM Schema The schema representing the Core and Common models. Versions of this schema will be released by the DMTF over time as the schema evolves. Class A collection of instances, all of which support a common type; tha

9、t is, a set of properties and methods. The common properties and methods are defined as features of the class. For example, the class called Modem represents all the modems present in a system. Client One of the two parties in a VHNE relationship (the other one being the Servers). The Client uses VH

10、NE to obtain information and control/management information from the Servers. Common model A collection of models specific to a particular area, derived from the Core model. Included are the system model, the application model, the network model and the device model. Conditional Access The strategy

11、and process that denies access to services based on authorization or payment. Control The vertical plane, or stack, in the network protocol model, which contains all of the protocol layers that are specifically dedicated to providing control and signaling. Control function can be from user to device

12、s (user-to-device control), or between devices (device-to-device control). Core model A subset of CIM, not specific to any platform. The Core model is set of classes and associations that establish a conceptual framework for the schema of the rest of the managed Versatile Home Network CEA-851-A 11 C

13、EA environment. Systems, applications, networks and related information are modeled as extensions to the Core model. Device Discovery The action that determines the existence and attributes of devices in a network system. Action may be either automatically or manually initiated. Domain A virtual roo

14、m for object names that establishes the range in which the names of objects are unique. End Device An end device is a digital device in the home whose purpose is to provide some benefit (other than network service) to the end user. Ethernet A network technology defined by the IEEE 802.3 specificatio

15、n. Explicit Qualifier A qualifier defined separately from the definition of a class, property or other schema element (see implicit qualifier). Explicit qualifier names must be unique across the entire schema. Implicit qualifier names must be unique within the defining schema element; that is, a giv

16、en schema element may not have two qualifiers with the same name. Extended schema A platform specific schema derived from the Common model. An example is the Win32 schema. Feature A property or method belonging to a class. Firewall A device that is inserted between the premises network and the acces

17、s line to establish a controlled link and to erect an outer security wall or perimeter to protect the premises network from access line-based attacks and to provide a single choke point where security and audit can be imposed. FireWire The Apple trademarked name for the IEEE 1394 high-performance se

18、rial bus. Flavor Part of a qualifier specification indicating overriding and inheritance rules. For example, the qualifier KEY has Flavor(DisableOverride ToSubclass), meaning that every subclass must inherit it and cannot override it. Gateway A device that serves as a point of entry, generally from

19、a local network to a larger network; gateways may interface the networks at all seven layers of the OSI Reference Model. Generic CAL An expansion and enhancement of the CAL language that allows CAL to be used in home networks that are not based on CEBus. Home Network An in-home network, usually digi

20、tal, that implements communication between end devices in the home, and between end devices and devices external to the home through access lines. IEEE 1394 A high performance serial bus that provides both isochronous and asynchronous connectivity between devices. Implicit Qualifier A qualifier defi

21、ned as a part of the definition of a class, property or other schema element (see explicit qualifier). Indication A type of class usually created as a result of the occurrence of a trigger. Inheritance A relationship between two classes in which all the members of Versatile Home Network CEA-851-A 12

22、 CEA the subclass are required to be members of the superclass. Any member of the subclass must also support any method or property supported by the superclass. For example, Modem is a subclass of Device. Instance A unit of data. An instance is a set of property values that can be uniquely identifie

23、d by a key. ISO The International Organization for Standardization, a worldwide federation of national standards bodies. Isochronous transmission Data transmission in which the time between the arrival of contiguous data packets is closely matched to time between their transmission, an important att

24、ribute of streaming data such as audio and video. Key One or more qualified class properties that can be used to construct a name. One or more qualified object properties which uniquely identify instances of this object in a namespace. Managed Object The actual item in the system environment that is

25、 accessed by the provider. For example, a Network Interface Card. Message The abstract concept of an atomic unit of communication. In this specification, the term message does not denote any specific protocol structure; rather, it is used to denote an abstract communication concept. Meta model A set

26、 of classes, associations and properties that expresses the types of things that can be defined in a Schema. For example, the meta model includes a class called property which defines the properties known to the system, a class called method which defines the methods known to the system, and a class

27、 called class which defines the classes known to the system. Meta schema The schema of the meta model. Method A declaration of a signature; that is, the method name, return type and parameters, and, in the case of a concrete class, may imply an implementation. Minimal Client A Client VHNE implementa

28、tion that has no persistent server component and therefore cannot receive messages from a Servers. Model A set of classes, properties and associations that allows the expression of information about a specific domain. For example, a Network may consist of Network Devices and Logical Networks. The Ne

29、twork Devices may have attachment associations to each other, and may have member associations to Logical Networks. Model Path A reference to an object within a namespace. MPEG-2 A digital video compression standard developed by the Moving Picture Experts Group. Name Combination of a Namespace path

30、and a Model path that identifies a unique object. Namespace An object that defines a scope within which object keys must be unique. Versatile Home Network CEA-851-A 13 CEA Namespath Path A reference to a namespace within an implementation that is capable of hosting CIM objects. Network Management Th

31、e operation or system that is responsible for managing a network (or a portion of the network) providing access to a wide variety of information regarding network configuration, performance and status. Network Protocol A link-layer independent protocol at level 3 of the 7-layer OSI Reference Model t

32、hat allows devices on diverse link-layer networks to communicate with each other. OSI Reference Model The Open Systems Interconnection Reference Model, developed by ISO, that defines a layered architecture in which each of seven layers performs specified tasks that are used by the layer above to eff

33、ect communication between devices. Payload A protocol structure encapsulating a set of logical VHNE operations delivered at discrete intervals. A payload is a single instance of an XML document formatted according to the protocol definitions contained in this specification. Polymorphism A subclass m

34、ay redefine the implementation of a method or property inherited from the associated superclass. The property or method is thereby redefined, even if the superclass is used to access the object. For example, Device may define availability as a string, and may return the values “powersave,” “on” or “

35、off.” The Modem subclass of Device may redefine (override) availability by returning “on,” “off,” but not “powersave.” If all Devices are enumerated, any Device that happens to be a modem will not return the value “powersave” for the availability property. POTS Plain Old Telephone Service, analog vo

36、iceband telephone service. Property A value used to characterize an instance of a class. For example, a Device may have a property called status. Provider An executable that can return or set information about a given managed object. Qualifier A value used to characterize a method, property, or clas

37、s in the meta schema. For example, if a property has the qualifier KEY with the value TRUE, the property is a key for the class. Receiver Generic term referring to the target of an VHNE payload. The term Receiver is used when it is possible for either the Client or the Servers to be the party receiv

38、ing the payload. Reference Special property types that are references or “pointers” to other instances. Request A message asking for the performance of an operation. Requests in VHNE are messages carried by payloads. Requestor Generic term referring to the initiator of an VHNE payload request. Resid

39、ential Gateway A device that mediates between one or more access network Versatile Home Network CEA-851-A 14 CEA technologies and one or more home network technologies. Responder Generic term referring to the recipient of an VHNE payload request. Response A message containing the results of an opera

40、tion. Responses in VHNE are messages carried by payloads. Routing The process of directing information towards their ultimate and intended destination based on a knowledge of the network topology, the network-addressing scheme and in some cases of network traffic levels. In connection-oriented netwo

41、rks this involves the process of selecting a connection path at the time of connection-oriented environments. Schema A namespace and unit of ownership for a set of classes. Schemas may come in forms such as a text file, information in a repository, or diagrams in a CASE tool. Scope Part of a Qualifi

42、er specification indicating with which meta constructs the Qualifier can be used. For example, the Qualifier ABSTRACT has Scope (Class Association Indication), meaning that it can only be used with Classes, Associations and Indications. Scoping Object Objects which represent a real-world managed ele

43、ment, which in turn propagate keys to other objects. Sender Generic term referring to the originator of a VHNE payload. The term Sender is used when it is possible for either the Client or the Servers to be the party sending the payload. Servers One of the two parties in a VHNE relationship (the oth

44、er one being the Client). Servers use VHNE to send information and control/management information to the Client. Service A definition of interface provided by a service and how to access it. There may be many independent services between a Server and a Client. Service Offer A proposed set of paramet

45、ers for a particular service. Signature The return type and parameters supported by a method. Stream OMG Definition A stream is a set of flows of data between objects, where a flow is a continuous sequence of frames in a clearly identified direction. Stream Interface OMG Definition A stream interfac

46、e is an aggregation of one or more source and sink flow end-points associated with an object. Subclass See Inheritance. Superclass See Inheritance. Top Level Object A class or object that has no scoping object. Transaction Security The operation or process that ensures the integrity, i.e., completio

47、n, restart, rollback, and roll forward of a sequence of events related in a fixed chronological series of transactions on a networked system. Trigger The occurrence of some action such as the creation, modification or deletion of an object, access to an object, or modification or access to a propert

48、y. Triggers may also be fired as a result of the Versatile Home Network CEA-851-A 15 CEA passage of a specified period of time. A trigger typically results in an Indication. Twist In the context of fiber connections, the transposition of fibers at a connector, so that the “receive” fiber and the “tr

49、ansmit” fiber are correctly oriented. Twisted Pair A communication medium that uses two copper wires twisted helically to reduce crosstalk and radio frequency emission and susceptibility. UI User Interface - the unit that handles the users service selection Unsolicited Message A protocol mechanism used in VHNE to provide a way for a Server to initiate communication to a Minimal Client. VHN Media Controller A device that presents a VHN Media Player or VHN Media Server control functions and status information. It also acts as a control mechanism for media management, transp