Tuesday, March 15, 2011

communications and networks

hye you alls...
did you know what is MODEM ??


                                            analog signals                                                  digital signals




to convert the digital signals to analog signals we need a modem.

MODEM is shorts words from modulator demodulator.

term:
modulation- - -  process of converting from digital to analog.
demodulation- - - process of converting from analog to digital.
   
   In IT modem
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





types of modems



 telephone modem


 DSL modem

 cable modem
 wireless modem

Modem functions:




   

Best regards,

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