BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT DTSTART:20250309T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20251102T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20250402T030102Z UID:CC172AF8-A958-4B41-816A-16E187C52A99 DTSTART;TZID=America/Los_Angeles:20250401T190000 DTEND;TZID=America/Los_Angeles:20250401T200000 DESCRIPTION:Voiceband modems convert a stream of digital symbols into audib le signals and transmit them over the Public Switched Telephone Network (P STN). The first voiceband modem was developed in 1958 and operated at 110 bits/s. Being subject to international standards developed by the Internat ional Union of Telecommunications\, Telecommunication Standardization Sect or (ITU-T)\, a body of the United Nations\, these modems consistently incr eased their transmission speeds within the next several decades. Every ste p in the standards process involved a major development in signal processi ng and communications\, such as various forms of adaptive equalization\, e cho cancellation\, and trellis coded modulation. These contributions appro ximately doubled the transmission speed of every step of the standardizati on process\, starting with 300 b/s in 1962 until about 28.8-33.6 kb/s in 1 996. Modem designers invoked Shannon's capacity formula and\, considering quantization noise occurring at the Analog-to-Digital conversion process i n the PSTN Central Office as additive white Gaussian noise\, decided that the channel capacity for such modems is about 36 kb/s. Yet\, towards the e nd of 1990s\, modems that operated at transmission speeds close to 56 kb/s \, known generally as 56K modems appeared. This talk will first give a bri ef history of voiceband modems\, and it will describe how it was possible to beat the Shannon capacity formula with the 56K modems. The underlying m odeling process and the related mathematics will be described. A history o f the development of the 56K modems will be presented and\, looking back s everal decades\, the technological\, as well as the economic and social im pact of these modems\, will be discussed.\n\nSpeaker(s): Ender Ayanoglu\, \n\nVirtual: https://events.vtools.ieee.org/m/466459 LOCATION:Virtual: https://events.vtools.ieee.org/m/466459 ORGANIZER:isayan@ieee.org SEQUENCE:7 SUMMARY:Beating the Shannon Limit: The Case of the 56K Modem URL;VALUE=URI:https://events.vtools.ieee.org/m/466459 X-ALT-DESC:Description: <br /><p>Voiceband modems convert a stream of digit al symbols into audible signals and transmit them over the Public Switched Telephone Network (PSTN). The first voiceband modem was developed in 1958 and operated at 110 bits/s. Being subject to international standards deve loped by the International Union of Telecommunications\, Telecommunication Standardization Sector (ITU-T)\, a body of the United Nations\, these mod ems consistently increased their transmission speeds within the next sever al decades. Every step in the standards process involved a major developme nt in signal processing and communications\, such as various forms of adap tive equalization\, echo cancellation\, and trellis coded modulation. Thes e contributions approximately doubled the transmission speed of every step of the standardization process\, starting with 300 b/s in 1962 until abou t 28.8-33.6 kb/s in 1996. Modem designers invoked Shannon's capacity formu la and\, considering quantization noise occurring at the Analog-to-Digital conversion process in the PSTN Central Office as additive white Gaussian noise\, decided that the channel capacity for such modems is about 36 kb/s . Yet\, towards the end of 1990s\, modems that operated at transmission sp eeds close to 56 kb/s\, known generally as 56K modems appeared. This talk will first give a brief history of voiceband modems\, and it will describe how it was possible to beat the Shannon capacity formula with the 56K mod ems. The underlying modeling process and the related mathematics will be d escribed. A history of the development of the 56K modems will be presented and\, looking back several decades\, the technological\, as well as the e conomic and social impact of these modems\, will be discussed.</p> END:VEVENT END:VCALENDAR