Native format - Some DTVs will convert the 18 ATSC formats into 1 or 2 formats and will draw only those. For these sets, the `native' format is - 1. the formats the set will draw or - 2. the original format. (These are contradictory definitions, but they reflect current practice. 1 is probably the preferred meaning.)

Over-the-air Broadcast (OTA) - Also called Terrestrial Broadcast. The delivery of TV and radio signals, using UHF/VHF frequencies, directly to consumer devices. Broadcasts may be either analog or digital.

MMDS - Multichannel, Multipoint Distribution System. A wireless cable system capable of being encoded for pay-per-view and subscriber services.

IEEE 1394 - Also called Firewire or iLink. Originally a serial bus for PCs, 1394 may or may not become the interconnection standard for DTV products. It is competing with DVI. IEEE 1394 is a spec for a hardware interconnect plus a software shell. But additional software, such as HAVi, is required for connected units to actually talk to each other. Some day 1394 may dramatically simplify the way DTV products interconnect.

D/A - Conversion of digital signals to analog signals. Most set-top boxes decode the digital signals broadcast and then convert them to analog signal for interconnection to the display device.

Transponder - A satellite channel. There is often one program per transponder. Some transponders are wider than 6 MHz and can carry more than one NTSC program. Several digital channels can fit on one transponder.

HDTV - High Definition Television - HDTV is a TV system having approximately twice the vertical and horizontal picture resolution of today's NTSC TV and having a wide aspect ratio of 16 - 9. Two HDTV formats are currently in use; (a) 1920 pixels per line and 1080i lines per frame and (b) 1280 pixels per line and 720p lines per frame. HDTV can be recognised by its spectacular picture resolution, freedom from annoying artefacts and impressive 5.1 channel surround sound.

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