IT Topic4

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Sunday, 1 March 2020

Modem




Modem
Do modulation
D2A and A2D converter
Mode+demod=modem










3 types of modems
External  direct connect modem
Internal direct connect modem

Acoustic coupler modem






External dcm are housed in external cabinet
Internal dcm are plugged in pc slot or on board
Fewer cables less expensive
Both have own processor , storage, and communication circuit for dial , answer ,disconnect.


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