The image of the PTTs was as suppliers of limited data communications, based on speech-quality circuits operating at low bit rates up to say 9600 bps, and in some countries this persists. However, in response both to competition from other suppliers and to the growing demands of the marketplace, many PTTs are now aggressive suppliers of innovative high-grade services, offering digital services with operating speeds over the full range from a few hundred bps up to tens or hundreds of Mbps, and with extensive interworking with other suppliers for both domestic and international traffic.
"PTT." A Dictionary of Computing. . Encyclopedia.com. (February 22, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/ptt
"PTT." A Dictionary of Computing. . Retrieved February 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/ptt
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"PTT." The Oxford Dictionary of Abbreviations. . Encyclopedia.com. (February 22, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ptt
"PTT." The Oxford Dictionary of Abbreviations. . Retrieved February 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ptt