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(1) To transmit data to multiple recipients on the network at the same time using one transmission stream to the switches, at which point data are distributed out to the end users on separate lines.

Contrast with Unicast
A "unicast" is a separate transmission stream from source to destination for each recipient. When sending large volumes of data, multicast saves considerable bandwidth over unicast.

Contrast with Broadcast
A "broadcast" is a transmission to every node reachable on the network or subnet, rather than to a specific list of nodes as in a multicast. See IP multicast, IGMP and SRM.

(2) In digital television broadcasting, to send multiple standard TV (SDTV) programs in the allotted bandwidth, rather than one high-definition TV (HDTV) program.

References in periodicals archive ?
In social networking, multicast is the delivery of a data or information to a group of recipients concurrently in a single transmission from the sender.
This paper is organized as follows: Section II discusses optimized task scheduler in multicast routing, Section III shows the study and analysis of the existing multicast routing techniques in social network, Section IV identifies the possible comparison between them and Section V concludes the paper, key areas of research is given to optimize the communication path over huge group of elements with multicast scalable secure routing.
The multicasts can be viewed by accessing the Film Scouts Web site at http://www.
The first Web site in the world to create original programming exclusively on the Internet, Film Scouts brought its viewers the first live broadcasts, IP multicasts and, for their Cannes coverage, the first-ever sponsored net event.
Commercially available since October 1997, UUcast has enabled content providers to transmit and efficiently distribute content over the Internet through the cost-effective, efficient means of multicast technology, reaching all of UUNET's domestic dial access users.
In addition to video content, QVMC-Source also multicasts control and schedule information in the form of Program Guides.
DataCast Combines Pub/Sub and IP Multicast Technologies
StarBurst's IP multicast technology ensures fast, reliable delivery of
The IP Multicast Initiative, which is backed by membership drawn from the vendor and user communities, will promote the deployment of an industry-standard bandwidth-conserving technology known as IP Multicast.
In addition to the reseller arrangement and equity investment, the two companies will collaborate on developing future standards-based multicast protocols, and multicast and multimedia management tools.
The IP/TV Viewer presents a list of scheduled multicasts at the recipient's desktop and displays the audio/video programs, providing controls that let the user "channel surf" among programs.
The IP Multicast Summit is the industry's only technical conference focused on the technologies, business and management of Multicast in IP networks.

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