We will principally talk about the basic functions of the modem. We will state the actual modems extensions, exploring for that the actual (and future) transmission technologies. We will concentrate on primarily three different classes of modems, that is intelligent modems, high-speed modems and wireless modem technology. In this project for each selected class of modems, we will explore the potential state of the art. We’ll attempt to explore different specifications from different vendors and analyse comparatively.

A modem is an essential piece of hardware to enable a user to connect to the Internet by normal telephone lines-it enables the users computer to send and receive information through their telephone lines. Combining the two words, modulator and demodulator derives the name “Modem”. They consist either of a box of electronics connected to your computer by a cable (an external modem), or a card which fits inside your computer (an internal modem). They also have a telephone line

· Phase modulation (PM) is most typically used in modems, where four phases (90 degrees apart) double the data bandwidth by transmitting two bits at time (which are referred to as dibits). The use of phase offers a degree of freedom in addition to frequency and its appropriate when the number of available frequencies is restricted.

· Frequency modulation (FM) is not nearly as sensitive to amplitude-related problems because information is encoded in the frequency of the signal rather than in the amplitude.

socket. Modems must be compatible with your computer type, so if you buy one, make sure you’ve got the right software and computer cable for your type of computer. We have all seen at one time or another modems that come with software that allows your computer to send and receive faxes, or even act as a telephone answering machine.

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