AIR - An innovative and integrated wireless network aimed at offering Triple Play services (Voice over IP, broadband Internet and digital TV)

Source of TV and RA programs in the AIR system are digital and/or analog satellite/terrestrial/cable TV and RA programs, received through satellite and terrestrial antennas or through cable. The satellite demodulator converts the received signal on the 1. Interfrequency to ASI output (in the case of digital receiver) or to analog signal (audio and video) in the case of analog receiver. In the case of an analog receiver, video and audio are then digitalized through MPEG2 encoders (ASI output provides the MPEG2 format directly). The MPEG 2 encoder can define a higher compression rate if needed. Signals received in digital format can not be additionally compressed.

The MUX digital multiplex equipment multiplexes 4 to maximum 9 (depending on the compression rate) TV and RA programs in digital MPEG2 format, received through an ASI or SPI interface. The MUX adds to ASI or SPI stream an additional data channel received from the IP DVB inserter (channel coding information).

The AIR CODING system (SCRAMBLER) provides the operator with the possibility of preventing unauthorized access to the air distribution services and provides better data transmission protection. AIR coding system offers flexibility of providing individual TV and RA program scheme to each separate user in the system. The AIR coding system is connected via the AIR IP inserter to the RF transport stream.