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The allocation of frequency bands to different users is shown in Figure 2.įiber-optic communications require a different kind of multiplexer called a wavelength division multiplexer (WAD). It suffers the problem of cross talk, and intermodulation distortion may take place.įDM is used in amplitude modulation (AM) and FM broadcasting, public telephone networks, and cable TV network systems. Here a large number of signals can be transmitted simultaneously. It does not need synchronization between the transmitter and receiver. Sometimes there is a possibility of cross talk because all the users use the transmission medium at the same time.įDM is used for analog signal transmission. But each of the users is allocated with different frequencies for transmission for avoiding the signal interference. #Advantages And Disadvantages Of Serial And Parallel Data Transmission fullIn FDM all users use the same common channel at full time. Each of these bands is used to carry a separate signal. #Advantages And Disadvantages Of Serial And Parallel Data Transmission seriesIn FDM the total bandwidth available in a communication medium is divided into a series of nonoverlapping frequency bands. Here the transmitter side performs multiplexing, and the receiver side performs demultiplexing. In the receiver side, the opposite process is carried out which is known as demultiplexing which extracts the individual channel signals. Multiplexing circuits are called multiplexer or MUX.įrequency division multiplexing is a networking technique which combines many signals into a single one and then transmitted the combined signal through a common communication channel. In order to transmit various signals over the same channel, it is essential to keep the signals apart to avoid the interference between them, and then it can be easily separated at the receiving end.ĭomains in which multiplexing can be accomplished are time, phase, frequency wavelength, etc. In general multiplexing is a technique in which several message signals are combined into a composite signal so that these can be transmitted over a common channel. ![]() Even though the transmission occurs on the same channel, they do not necessarily occur at the same instant. Thus the cost of transmission can be reduced. This channel can be a physical medium like a coaxial, metallic conductor or a wireless link and will have to handle multiple signals at a time. The advantage of multiplexing is that we can transmit a large number of signals to a single medium. If digital signals are multiplexed, then this type of multiplexer is called digital multiplexer. If analog signals are multiplexed, then this type of multiplexer is called analog multiplexer. ![]() We can be able to multiplex analog or digital signal. Multiplexing is the process of transmission of information from more than one source into a single signal over a shared medium. ![]()
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