Satellite and microwave-based services also require specific external receiver hardware, so the use of set-top boxes of various formats has never completely disappeared. Content, in this context, could mean any or all of video, audio, Internet web pages, interactive video games, or other possibilities. The signal source might be an Ethernet cable, a satellite dish, a coaxial cable (see cable television), a telephone line (including DSL connections), broadband over power lines (BPL), or even an ordinary VHF or UHF antenna. A consumer Palcom DSL-350 satellite-receiver the IF demodulation tuner is on the bottom left, and a Fujitsu MPEG decoder CPU is in the center of the board.
