MODEM.

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Presentation transcript:

MODEM

WHAT IS MODEM? Modem , short for modulator- demodulator is an electronic device that converts computer`s digital signals into specific frequencies to travel over telephone or cable television lines. At the destination, the receiving modem demodulates the frequencies back into digital data. Computers use modems to communicate with one another over a network.

How modem works? modems are computer hardware typically used to transmit digital data over a phone line. The working of modems can be easily understood from this.

TYPES OF MODEMS

DSL(DIGITAL SUBSCRIBER LINE) MODEM DSL modems are the type of modems used to connect a PC to the internet. the foremost advantage of DSL is its ability to use the phone line to make or receive calls while connected to the INTERNET.

DSL MODEM

ADSL (ASYMMETRIC DIGITAL SUBSCRIBER LINE) MODEM ADSL modem provides faster downloading than uploading. ADSL service is like an “always on” connection that cannot be left connected indefinitely. Like dial up modem it also uses a standard telephone line but it does not tie up the line.

ADSL

SDSL (SYMMETRICAL DIGITAL SUBSCRIBER LINE) MODEM SDSL modems works on SDSL lines that provide equal bandwidth in both directions. These modems use voice traffic lanes to expand bandwidth, and therefore aborting the possibility of a conversation when the SDSL modem is connected. For this purpose a dedicated phone line is required.

CABLE MODEM Cable modems are the types for modems that uses cable TV wiring instead of the phone line to provide internet connectivity. Cable modems mainly deliver broadband internet access in the form of cable internet taking the benefit of the HIGH BANDWIDTH of a cable television network. Cable modems work on the same principle as the DSL modem.

CABLE MODEM

SAT MODEM (SATELLITE MODEM) One of the least common types of cable modem is a satellite modem. It is a wireless modem converting digital data into radio waves to communicate with a satellite dish. Sat modems can be of great help for businesses or people in rural areas that do not yet have DSL or cable service offerings.

SAT MODEM

EXTERNAL MODEM It is the second term we have to consider from different types of computer modem. An External modem can be used to the same purpose and in the same conditions as internal computer modem. However external modem is a small box that uses other kind of interfaces to be connected to the computer.

EXTERNAL MODEM

END!!