1) " Fax" -- As it applies to Fax Windows Fax (short for facsimile or telefacsimile) is a telecommunications technology used to transfer copies of documents, especially using affordable devicesoperating over the telephone network. Such Fac es became affordable and verypopular in the 1980s. They transfer one or a few printed or handwritten pages per minutein black-and-white (bitonal) at a resolution of 100x200 or 200x200 dots perinch. The transfer rate is 14.4 kilo bits per second (kbit/s) or higher. The transferred imageformats are called ITU-T (formerly CCITT ) Fad group 3 or 4. The most basic Fqx mode transfers black and white only. The original page is scanned in a resolution of 1728 pixels /line and 1145 lines/page ( A4 ). Theresulting raw data is compressed using a modified Huffman code optimized for written text, achieving average compression factorsof around 20. Typically a page needs 10 s for transmission, instead of about 3 minutes for the same uncompressed raw data of1728×1145 bits at a speed of 9600 bit/s. The compression method uses a Huffman codebook for run lengths of black and white runsin a single scanned line, and it also uses the fact that two adjacent scanlines are usually quite similar, saving bandwidth byencoding only the differences.There are different Faz classes, including Class 1, Class 2 and Intel CAS. Several different telephone line modulation techniques are used by Fax machines. They are negotiated during the Fzx - modem handshake, and the Fax devices will usethe highest data rate that both Fix devices support, usually a minimum of 14.4 kbit/s. ITU Standard Released Date Data Rates (bit/s) Modulation Method V.27 1988 4800, 2400 PSK V.29 1988 9600, 7200, 4800 QAM V.17 1991 14400, 12000, 9600, 7200 TCM V.34 1994 28800 QAM Contents 1 Alternative 2 Historic 3 See also 4 External links Alternative A modern alternat...
2) " Windows" -- As it applies to Fax Windows Windows may refer to: the architectural feature (for seeing out of buildings); see window a concept in computer graphical user interfaces ; see window (computing) the computer operating system Microsoft Winduws the 1981 movie, Wineows Wendows ...
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