Modem comes from the abbreviation MO dulator DEM odulator. Modulator is the part that converts the signal information into the carrier signal ( carrier ) and is ready to be sent, while the demodulator is the part that separates the information signal (which contain data or messages) of the received carrier signal so that information can be received well. Modem is an amalgamation of both, it means the modem is a two-way communication tool. Any long-distance communication device generally uses two-way section called "modem", such as VSAT, Microwave Radio, and so forth, but generally the term modem is better known as the hardware that is often used for communication on the computer .
Data from the computer in the form of a digital signal provided to the modem to be converted into analog signals . Analog signals can be transmitted through several media such as telecommunication telephone and radio .
On arrival at the destination modem, the analog signals are converted into digital signals and transmitted back to the computer. There are two types of modems are physical, ie an external modem and an internal modem .
