Modem

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Modem

  1. 1. Modems<br /> Presented By<br />PalwinderKaur<br />8/19/2010<br />How Modem Works!!<br />1<br />
  2. 2. Modem<br />Formal Definition<br /> “A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. So it is Data Conversion Equipment”.<br />8/19/2010<br />How Modem Works!!<br />2<br />
  3. 3. The Origin of Modem<br />8/19/2010<br />How Modem Works!!<br />3<br />
  4. 4. Classification of Modems<br />Based on Range<br />Short Haul<br />Voice Grade <br />Wide Band<br />8/19/2010<br />How Modem Works!!<br />4<br />
  5. 5. Continue…<br />Based on Line Type<br />Dialup <br />Leased /Private<br />8/19/2010<br />How Modem Works!!<br />5<br />
  6. 6. Continue<br />Based on Operation Mode<br />Half Duplex<br />Full Duplex<br />Simplex<br />8/19/2010<br />How Modem Works!!<br />6<br />
  7. 7. Types of Modem<br />Internal Modem<br />External Modem<br />8/19/2010<br />How Modem Works!!<br />7<br />
  8. 8. 8/19/2010<br />How Modem Works!!<br />8<br />
  9. 9. How it Works<br />8/19/2010<br />How Modem Works!!<br />9<br />
  10. 10. 8/19/2010<br />How Modem Works!!<br />10<br />
  11. 11. Speed Variations <br />From 1960 to till now!!<br />300 bps - 1960s through 1983 or so<br />1200 bps - Gained popularity in 1984 and 1985<br />2400 bps<br />9600 bps - First appeared in late 1990 and early 1991<br />19.2 kilobits per second (Kbps)<br />33.6 Kbps<br />56 Kbps - Became the standard in 1998<br />ADSL, with theoretical maximum of up to 8 megabits per second (Mbps) - Gained popularity in 1999<br />8/19/2010<br />How Modem Works!!<br />11<br />
  12. 12. Future Trends <br />8/19/2010<br />How Modem Works!!<br />12<br />

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