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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 multicasting transmission process does not have any effect on onboard data speed for the mini-VSAT broadband network and the service also offers digital rights management or copyrighted material, giving access to Hollywood movies and television programs.
Radio stations serving every Arbitron market plus dozens of unrated markets are now providing listeners with digital AM and FM coverage, and, in many of these markets, broadcasting innovative new programming via HD2 multicasting.
Once multicasting is ready, the Web won't be just a different way to deliver radio shows.
And properly used, multicasting will allow television stations to reach out to their viewers, and increase their advertising revenues (which is the main reason for multicasting).
Multimedia Broadcasting and Multicasting in Mobile Networks discusses multimedia services, introducing the potentials and limitations of the multicasting and broadcasting technologies.
The excitement for these new products has been further heightened by the recent explosion of interest in multicasting, which allows FM stations to offer new programming channels.
264 Advanced Video Coding (AAC), Real Networks, Windows Media and Quicktime, VoD and IP multicasting, FttH, FttC, HFC, ADSL and WiMAX, MP3, Spectral Band Replication (SBR), Parametric Stereo and Scalable Lossless Coding, HILN, MPEG-7 metadata and MPEG-21 digital rights management standards (DRM).
First, it simplifies the infrastructure build-out of multicasting for BTV users.
Sigma will also be demonstrating the first-ever high definition IP Multicasting using ultra-wideband (UWB) over an extended range.
Nasdaq: HYPR), the premiere source for financial market data and data- delivery solutions, will use IP multicasting technology over Sprint's public Internet network to deliver HyperFeed 2000 consolidated datafeeds to the financial community.
Multicasting can be used in a range of applications such as updating the address books of mobile computer users, distributing company newsletters to mailing lists, and broadcasting streaming media to multicast group members.
Freeware Drive Cloning and Multicasting Product Features Exceed those of

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