Abstract—We investigate the signal propagation process in a chain of series-connected asynchronous threshold elements. The asynchronous nature of the elements is manifested in the fact that they can have varying duration of switching from a passive state to an active state and vice versa. The elements are reactive; i.e., they are excited as a result of external influences and become passive when there are no external influences. It is shown that, depending on the element on-off switching transient duration ratio, the duration of the signal passing through the chain can be preserved, increase, or decrease. In the last case, the signal does not pass through a sufficiently long chain. The conditions for the passage of a signal through the chain are stated.