In this illustration of FDM, the circuit is depicted as a block shape that is segmented into three horizontal bands; the top band is gray, the middle band is white, and the bottom band is gray. The gray bands are labeled "4KHz." The block itself is labeled "Link," and the width of the block, from top to bottom, is labeled "Frequency."

In this illustration of TDM, the circuit is depicted as a long rectangle that is divided up with vertical lines into many small segments. These segments are numbered 1-4 and color-coded: 1 is white, 2 is dark blue, 3 is light blue, and 4 is a medium shade of blue. Individual segments are labeled "Slot" and the groupings of fours are labeled "Frame." A key notes that: "All slots labeled '2' are dedicated to a specific sender-receiver pair." The entire circuit, from left to right, is labeled "Time."

In this illustration of TDM, the circuit is depicted as a long rectangle that is divided up with vertical lines into many small segments. These segments are numbered 1-4 and color-coded: 1 is white, 2 is dark blue, 3 is light blue, and 4 is a medium shade of blue. Individual segments are labeled "Slot" and the groupings of fours are labeled "Frame." A key notes that: "All slots labeled '2' are dedicated to a specific sender-receiver pair." The entire circuit, from left to right, is labeled "Time."