Short for telefacsimile
?, the art and technology within
telecommunication for remotely copying images, especially affordable devices operating over the
telephone network. Such faxes became affordable and very popular in the
1980s. They transfer one or a few printed or handwritten pages per minute in black-and-white (bitonal
?) in a resolution
? of 200 dots per inch. The transfer rate is 14.4 kilobit per second or higher. The transfered image formats are called
CCITT fax group 3 or 4.