What is FTN in networking?

Excuse me, could you elaborate on the meaning and function of FTN in the realm of networking? As a technology enthusiast, I'm particularly interested in understanding the nuances of various network protocols and their components. FTN seems to be a term that I've encountered but have not yet grasped fully. Is it a specific type of network architecture, a data transfer method, or perhaps a reference to a network service? Your insights into this would greatly enrich my understanding of modern networking practices. Thank you for your time and assistance in clarifying this matter.