The interactivity channel aspects of the Brazilian Digital Terrestrial Television Standards are described in document ABNT NBR 15607-1:2008 - Digital terrestrial television - Interactivity channel -Part 1: Protocols, physical and software Interfaces, published by ABNT, the Brazilian Association of Technical Standards (Associação Brasileira de Normas Técnicas) [REF].
The standard establishes the ways in which a receiver device can send information back to the broadcaster through different communication means.