 A single transport may carry conventional television channels, radio, teletext, and sometimes hidden channels carrying metadata or interactive services.In the United States, the standard for over-the-air digital transmissions is ATSC, digital cable is based on the worldwide DVB standard, DVB-C ("C" for cable) and transmission via satellite are based on the DVB-S ("S" for satellite) standard, all use multiplexes to deliver various channels to the viewer.Smaller and newer commercial networks, such as The CW and MyNetworkTV, are available in some markets as digital subchannels of stations affiliated with other networks rather than as standalone stations.