The following are different types of modems:
External Modem
They are connected to the computer externally.
They are more expensive than internal modems.
They are easy to setup and need external power supply.
Internal modems
These are inserted into the main mother board.
They derive their power supply from the main computer.
They are cheaper than external modems.
They are difficult to set up than external modems
Wireless Modems:
They transmit the data signals through air with out the need of a cable.
They are also called as radio-frequency modems.
They are part of wireless local area networks
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