chapter 11 vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| assured forwarding | a forwarding specification
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| af | allows routers to assign data streams one of several priorization levels
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| analog telephone adapter | an internal or external adapter that converts analog telephone signals into packet switched voice signals and vice versa
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| differentiated service | a technique for ensuring quality of service by prioritizing traffic
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| expediated forwarding | a forwarding specification that assigns each data stream a minimum departure rate from a given node
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| ef | technique circimvents delays that slow normal data from reaching its destination on time and in sequence
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| endpoint | any client server or gateway communicating on the network
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| fax gateway | translate IP fax data into analog fax data and vice versa
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| fax gateway | emulate and interpret conventional fax signaling protocols when communicating with a conventional fax machine
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| fax over ip | a service that transmits faxes over tcp/ip network
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| h.225 | session layer call signaling protocol
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| h.225 | responsible for call or videoconferencing setup between two nodes on a VoIP network, indicating node status, requesting additional bandwith and call termionation
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| h.245 | a session layer control protocol
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| h.245 | responsible for controlling a session between two nodes
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| h.323 | describes an architecture and a suite of protocols for establishing and managing multimedia services sessions on a packet switched network
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| h.323 gatekeeper | authorize and authenticate terminals and gateways,manage bandwith,and oversee call routing,accounting and billing
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| h.323 gateway | a gateway that provides translation between network devices running h.323 signaling protocols and devices running other types of signaling protocols
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| h.323 terminal | any node that provides audio visual or data information to another node
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| h.323 zone | collection of h.323 terminals,gateways,and mcus that are managed by a single h.323 gatekeeper
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| internet telephony | the provisions of telephone service over the internet
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| ip-pbx | a private switch that accepts and interprets both analog and digital voice signalsconnects with both traditional pstn lines and data networks
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| ip-pbx | transmits and receives ip based voice signals to and from other network connectivity devices,routers and gateways
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| ip telephone | designed to transmit and receive only digital signals.used for VoIP on a tp/ip based networks
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| ip television | a serivce in which tv signals from broadcast or cable networks travel over packet switch networks
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| multipoint controlunit | a computer that provides support for multiple h.323 terminals, for ex several workstations participating in videoconferencing, and manages communication between them. also known as video bridge
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| media gateway | a gateway capable of accepting connections from multiple devices ,for example ip telephones,fax machines,
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| media gateway controller | a computer that manages mu,tiple media gateways and facilitates the exchange of call information between these gateways
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| media gateway control protocol | used for communication between media gateway controllers and media gateways
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| mgcp | defined in rfc 2507, the most popular media gateway control protocol used on converged networks
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| private branch exchange | a telephone switch used to connect calls within a private organization
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| proxy server | a server thataccepts requests for location information from user agents, then queries the nearest registrar server on behalf of those user agents
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| redirect server | a server that accepts and responds to requests from user agents and sip proxy servers for location information on recipients that belong to external domains
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| registrar server | a server that maintains a database containing information about the locations(network addressses) of each user agent in its domain.when a user agent joins the network it transmits its location information to the sip registrar server
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| resource reservation protocol | a QoS technique that attempts to reserve a specific amount of network resources for a transmission before the transmission occurs
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| real time transport protocol | a transport layer protocol used with voice and video transmission.operates on top of udp and provides information about packet sequence to help receiving nodes detect delay and packet loss.
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| real time transport protocol | assigns packets a timestamp that corresponds to when the data in the packet was sampled from the voice or video stream.this timestamp helps the receiving node synchronize incoming data
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| set top box | a device that decodes digital video signals and issues them to the tv.also communicate with content servers to manage video delivery
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| signaling | the exchange of information between the components of a network or system for the purposes of establishing,monitoring, or releasing connections as well as controlling system operations
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| session initiation protocol | a protocol suite codified by the ietf,in rfc 2543, as a set of session layer signaling and control protocols for multiservice,packet based networks.performs much the same functions as the h.323 signaling protocols perform.
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| sip | was developed as a more efficient alternative to h.323 ,before h.323 was revised to expedite its call setup functions.
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| softphone | a computer configured to act like an IP telephone.present the caller with a graphical representation of a telephone dial pad and can connect to a network via a LAN,wan,ppp dial-up connection or leased line
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| signaling system 7 | set of standards established by the itu for handling call signaling on the public switched telephone network
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| streaming video | a service in which video signals are compressed and delivered over the internet in a continuous stream so that a user can watch and listen even before all the data has been transmitted
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| toll bypass | a cost saving benefit that results from organizations completeing long distance telephone calls over their packet switched networks,bypassing tolls charges by common carriers on comparable pstn calls
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| unified messaging | the centralized management of multiple types of network based communications,such as voice,video and fax
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| user agent | a user agent client or user agent server
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| user agent client | end user devices such as workstation,cell phones.initiates a sip connection
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| user agent server | a server that responds to user agents requests for session initiation and termination
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| video on demand | a service in which a video stored as an encoded file is delivered to a viewer upon his request
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| video over ip | any type of video service,video conferencing,and streaming video,that delivers video signals over packet switched networks using the tcp/ip protocol suite
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| video phone | a type of phone that includes a screen and can decode compressed video and interpret transport and signaling protocols necessary for conducting videoconference sessions.
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| videoconferencing | the real time reception and transmission of images and audio among two or more locations
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| voice over atm |
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