At present there are millions of users in Spain to enjoy television through cable technology. Such technology is beginning to settle in our country in 70 years, but their development does not occur until the year 1995 with the arrival of the Telecommunications Act by cable.

Today, there are seven operators offering this service in Spain: Auna, Ono, Euskaltel, Telecable, Retecal and Tenaria. Companies are more important Ono and Auna covering the vast majority of Spanish territory, in addition to offering integrated services de banda ancha, telephone, Internet and television, as well as some interactive services.

Such technology is basa in a fiber-optic network through which is the transmission of voice, data, still images, video, sound, other formats. It is characterized inter alia, by the great speed at which transmits signals and the quality of resolution it offers.

The ability of cable networks makes it possible, in television services, in addition to offering traditional television programs, instant connections through the Internet, video on demand and other user additional interactive services.

Through the means of transmission, which is bidirectional, it is possible to use the same cable network to communicate with the header-TV operator and this provides the ease of recruiting films, send e-mails or SMSs, use interactive services between other benefits from the same screen TV.