The ability to broadcast messages to one node or a select group of nodes.

sending messages from one host to many hosts that are addressed as such

When you send out data (such as your voice on a Web phone) to a few receivers you've identified and selected, it's called multicasting.

mechanism which efficiently delivers video, audio and data streams from one source to many receivers without huge bandwidth requirements on the network and applications server. The stream is duplicated at routers throughout the network and can be transmitted to a potentially unlimited number of receivers in a similar way to traditional television and radio broadcast.

Term given to the sharing of the digital television channel among 2, 3, 4 or more individual programs and/or data services

In a network, a technique that allows data to be simultaneously transmitted to a selected set of destinations.

This is the most efficient delivery of information to multiple destinations simultaneously. Multicasting uses packet-switched transmissions so that multiple users receive the broadcast signal. Internet Relay Chat is a popular example.

Conferencing applications that typically use packet-switched transmission to broadcast a signal that can be received by multiple recipients, all of whom are listening on a single multicasting address.

Transmitting information to more than one recipient using technologies such as teleconferencing and videoconferencing.

Sending data to a specific group of destinations at once.

Directing a message or a packet to some subset of all stations on a network by the use of a special destination address.

Transmission of more than one program on the same channel, using such techniques as subcarriers and the formats provided in ATSC digital broadcasting.

A process in which a message is sent by one host to multiple hosts, such as when a video conference is broadcast to several hosts on the Internet.

A technique of using a single Digital Off-Air channel to deliver multiple sub-channels is called multicasting. DTV broadcasters can choose to use all of there bandwidth for one high-definition program or they might subdivide the channel, giving most of the bandwidth to one high-def program (at a slightly reduced picture quality), and use the remaining bandwidth for one standard-definition program at a much lower picture quality. Alternatively, the broadcaster might deliver several standard-definition programs at the same time; all at a lower video quality.

The ability for a broadcaster to deliver multiple program streams on a single digital television channel. For example, on channel 2 you could watch standard definition program streams 2-1, 2-2, 2-3 or 2-4. During dayparts, when the television station is broadcasting high definition programs, the multicasting option goes away.

sending messages to a specified group

Sending data, audio or video simultaneously to a number of end users. Data Broadcasting (noted above) is one form of multicasting.

The ability to send more than one program or data service within the allotted channel spectrum. Digital channels can squeeze up to four channels into their spectrum. For example, WCET will soon multicasts programming on channel 34. Viewers in that service area with digital sets simply tune to channel 34 and then choose among four different services: 34-1, 34-2, 34-3, or 34-4.

Often used in online learning, it is an application that broadcasts from one computer to many computers online.

the ability to send more than one channel of programming within the allotted channel spectrum. While analog channels have traditionally used a standard amount of spectrum (represented by each click on your tuner dial), digital channels can squeeze four or more channels into their spectrum. (See also simulcast.) For example, KET currently multicasts programming on channel 46 in Lexington. Viewers in that service area with digital sets simply tune to channel 46 and then choose among four different services: 46-1, 46-2, 46-3, or 46-4.

Generally, multicasting refers to propagation from one source to only a subset of potential destinations. It also means a technique for simultaneously sending multiple DTV programs on a single channel. The frequency used to carry a single analog television program can be used to carry up to six digital programs.

The division of a station's broadcast signal into sub-channel s of programming or data services...

Multicasting is the opposite of broadcasting. When sending a packet out on the network, a packet is sent to each computer playing on the network. This has a big drawback though. Whereas with broadcasting each player sends out one update, with multicasting each player has to send a message to each other player in the simulation. See also: Broadcasting.

The ability to transmit multiple standard-definition programs simultaneously using a single digital broadcast channel.

The transmission of information to more than one recipient. For example, sending an e-mail message to a list of people. Teleconferencing and videoconferencing can also use multicasting.

Transmitting a message to multiple recipients at the same time. A point-to-many networking model in which a packet is sent to a specific address, and only those computers that are set to receive information from this address receive the packet.

Because DTV allows you to pack more information into the allotted signal using compression, we can transmit multiple channels in the same bandwith instead of just one. Think of the broadcasting bandwith as a multi-lane freeway. You can run a big, flashy, wide-load truck carrying an HDTV program and take up all the lanes, or you can send multiple compact cars down the same freeway, each carrying an SDTV program.

The ability of broadcasters to include more than one program within the broadcast stream. Discretionary use of bandwidth enables broadcasters to choose between sevderal SD (standard definition) programs or one HD (high definition) program in addition to some amount of discrentionary data.

A technique in which two or more minor channels (TV programs) are simultaneously broadcast on one major channel. Multicasting can also be used to send more than one audio program on a single channel.

Sending a packet that can be received by multiple recipients, all of whom are listening on a single multicast address.

The process by which a message is sent to a set of logically related nodes by means of a single, designated address. In a LAT network, the group of related nodes are terminal servers, which receive service announcements by means of a multicast address.

Because digital television allows you to pack much more information into the allotted signal, we can transmit multiple channels on the same bandwidth instead of just one. Think of a broadcasting bandwidth as a multi-lane freeway. You can run a big, flashy, wide-load truck carrying HDTV and take up all of the lanes, or you can send multiple compact cars down the same freeway, each carrying specialized programming. When not broadcasting KCTS-DT HDTV on the majority of the bandwidth, KCTS multicasts three SDTV program streams on its digital channel 41: KCTS-DT, KCTS-DT Plus, and KCTS-DT Learns. These channels are broadcast in standard definition television (SDTV) programming.

Broadcasting information, such as audio or video, over the internet to multiple selected recipients. Unlike webcasting, only those selected to receive the multicast can access the information.

Broadcasting several programs at once via DTV on a single channel. Eventually, a WHYY-DT viewer might be able to receive Sesame Street or Nova at the same time, and choose the program preferred.

Option made possible by digital technology to allow each digital broadcast station to split its bitstream into 2, 3, 4 or more individual channels of programming and/or data services.

An Internet protocol for distributing the same digital files from one computer to multiple other computers at the same time.

A "live" stream sent out to multiple viewers in real-time instead of from a file that is stored on a server and sent out when requested.

The ability of one network node to send identical data to a number of end servers on the multicast backbone. For large amounts of data, IP multicasting is more efficient than normal Internet transmissions because the server can broadcast a message to multiple recipients simultaneously.

"An audio, video, email, or application broadcast over the web, from one computer to many."

Broadcasting several DTV programs at once on a single channel. A KQED-DT viewer might be able to receive Sesame Street and Nova at the same time, and choose the program s/he prefers by selecting that "channel" from our digital bouquet.

Subdividing the digital audio portion of a radio station's signal to send out different kinds of programming simultaneously. A multicasting station could, for example, broadcast Top 40 programming as their analog and primary digital format, while multicasting an additional digital-only channel for Oldies, and a third digital channel for News/Talk.

The transmission of a video or audio stream from one sender to multiple users. See MBONE.

The process of sending a message simultaneously to more than one destination on a network.

Simultaneous distribution of data to a defined subset of all receive points in a network. The subset may be redefined for each transmission and range from one to all receive points.

This is the process of transmitting more then one program over the air at the same time on the same channel. When stations are given their channel for DTV broadcasting they are allocated a specific amount of bandwidth. If they are not using the full amount of bandwidth, they can squeeze more programs OTA through that same channel. These channels are denoted by hyphens, such as 29-1, 29-2 and so on instead of what you might be used to as one channel on 29. Some stations are broadcasting one SDTV and one HDTV channel without much picture quality loss in the High Definition program.

The transmission of messages from a single sender to many recipients.