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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 ?
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.
The HP ProCurve IP Multicast enabled switches control delivery of quality multimedia multicast traffic to a networked PC or other network appliance.
Extending the reach of multicast technology to dedicated users opens new opportunities for business customers to send audio, video and other content over the Internet at a fraction of the cost of traditional unicast technology," said Ralph Montfort, director of dedicated access product marketing at UUNET.
The Advantages of Multicast Technology for Dial and Dedicated Connections UUcast enables information providers to simultaneously reach hundreds of thousands of users via a single transmitted stream of information.
In addition to video content, QVMC-Source also multicasts control and schedule information in the form of Program Guides.
set a new standard in video multicast streaming today with the announcement of QuickVideo MultiCast(TM) (QVMC(TM)) -- the first multicast streaming solution to provide individuals with server-based instant replay functions while they watch live video broadcasts at their desks.
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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