Frequency-Division Multiplexing (FDM) is a technique used to combine multiple analog signals into a single signal over a single cable. FDM is used to increase the capacity of a cable, allowing multiple signals to be sent simultaneously over the same cable.
FDM works by assigning each signal a different carrier frequency. The multiple signals are then merged together into a single signal with a broad range of frequencies. This combined signal is then transmitted over the cable. The signal is received at the other end of the cable and then demultiplexed, meaning that each signal is separated back out into its original frequency range.
The use of FDM allows a single cable to carry multiple signals. This is useful when multiple analog signals need to be sent over the same cable. It can also be used to increase the capacity of a single cable, as more signals can be sent over the same cable at once.
FDM is commonly used for cable television, as it allows multiple analog signals to be sent over a single coaxial cable. It is also used to transmit telephone calls over landlines, as it allows for multiple calls to be sent over the same line at once.
Overall, FDM is a useful technique for combining multiple analog signals into a single signal. It allows more signals to be sent over the same cable, increasing the capacity of the cable. This technique is commonly used for cable television and telephone calls over landlines.