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OCAP is based on the Globally Executable MHP (GEM)-standard, and was defined by Cable Labs. Because OCAP is based on GEM, it has a lot in common with the Multimedia Home Platform (MHP)-standard defined by the DVB-project. OCAP is based on Java . At present two versions of the OCAP standard exist:
GLOBALLY EXECUTABLE MHP MHP ( Multimedia Home Platform ) was developed by the DVB Project as the world's first open standard for interactive television. It is a Java-based environment which defines a generic interface between interactive digital applications and the terminals on which those applications execute. MHP was designed to run on DVB platforms but there was a demand to extend the interoperability it offers to other digital television platforms. This demand gave rise to GEM, or Globally Executable MHP, a framework which allows other organisations to define specifications based on MHP. One such specification is OCAP, the Open Cable Application Platform created by CableLabs which has been adopted by the US cable industry. In OCAP the various DVB technologies and specifications that are not used in the US cable environment are removed and replaced by their functional equivalents, as specified in GEM. On the terrestrial broadcast side, Cablelabs and ATSC have worked together to define a common GEM-based specification, ACAP, which will ensure maximum compatibility between cable and over-the-air broadcast receivers. ACAP has recently been elevated to the status of "ATSC Proposed Standard" and cooperation with DVB is on-going. Both OCAP and ACAP services are now on air in South Korea. SEE ALSO
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