PD CLC/TR 50083-10-1:2014

Radio - A device used for listening to audio transmissions

Frequency - A term used to describe how often something is done

Frequency - A wave frequency is the number of times a wave repeats within a given time

Television - A device used for receiving moving images and sound

Cable - A series of wires bonded to form a single thread

Interactive - Interaction can take place between a person and a device

The British Standards Institution are a non profit making organisation, who produce standards and standard related services, for a variety of industries. The standards that they produce are used as a guideline or definition of the minimum levels certain services and product should reach. The standards are produced by BSI directly, following consultations and public enquiries. At shop.bsigroup.com, you can purchase a variety of standards. They stock documents for industries such as food and drink, engineering, building and construction, energy and utilities, transport and agriculture and farming. If you become a member of their site you can get huge discounts on their standards. They also offer training courses and conferences via their website, or you could take advantage of their online standards tools.