1) Broadcasting 2) Radio technology 
Datacasting (data broadcasting) is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital television, but may also be applied to digital signals on analog TV or radio. It generally does not apply to data which is inherent to the medium, such as PSIP...
Broadcasting of information and other data services via digital TV, often as a supplementary offering to enhance the appeal of digital TV channels.
Digital television allows for the transmission of not only digital sound and images, but also digita