An interactive VOD television service was proposed as early as 1986 in Japan, where there were plans to develop an "Integrated Network System" service. It was intended to include various interactive services, including videophone, home shopping, tele-banking, working-at-home, and home entertainment services. However, it was not possible to practically implement such an interactive VOD service until the adoption of DCT and ADSL technologies made it possible in the 1990s. In early 1994, British Telecommunications (BT) began testing an interactive VOD television trial service in the United Kingdom. It used the DCT-based MPEG-1 and MPEG-2 video compression standards, along with ADSL technology.