Compare and contrast the older multiplexing techniques such as frequency division and time division multiplexing with the newer techniques such as discrete multitone and orthogonal frequency division multiplexing. What appears to be the trend in these newer protocols?

As compared to new multiplexing techniques, older techniques like FDM frequency-division multiplexing (FDM) may be a technique by which the entire bandwidth available during a communication medium is split into a series of non-overlapping frequency sub-bands, each of which is employed to hold a separate signal.

Explanation:

Especially used for Radio and tv Broadcasting and TDM ( Time-division multiplexing (TDM) may be a method of transmitting and receiving independent signals over a standard signal path by means of synchronized switches at each end of the cable in order that each signal appears on the road only a fraction of your time in an alternating pattern, especially used for telegraphy) are simple; they'll be suffering from noise and their transmission speeds are high. New techniques are far more complex, they will be suffering from more noise and transmission speeds are very high as compared to older techniques.