This figure shows an illustration of an FDM above an illustration of a TDM.

The FDM consists of three layers positioned top to bottom. The top layer is shaded in gray and labeled 4KHz. The middle layer is white and unlabeled. The bottom layer is the same as the top layer. All three layers are labeled "Link."

The TDM is depicted as a row that has been divided up into multi-colored and numbered rectangles. A key at the bottom explains that "All slots labeled '2' are dedicated to a specific sender-receiver pair." The TDM begins, moving left to right, with a white slot labeled 1. Next is a dark blue slot labeled 2 (and which is further identified as a slot). Next is a light blue slot labeled 3, followed by a medium blue slot labeled 4. This pattern of white-dark blue-light blue-medium blue slots labeled 1, 2, 3, 4 is identified as a Frame. There are four frames in total.