Most Fiber cables don't Need to be Replaced. If installed and protected correctly against technical and environmental conditions, they can last: 25–50 years (outdoor plant infrastructure, long-haul wiring) 15–30 years (indoor building wiring systems) 10–20 years (FTTH plant drop. Most Fiber cables don't Need to be Replaced. But ask any veteran network engineer, and they will tell you a different story. Some fiber optic cables fail in 5 years, turning. The longevity of fiber optic cabling infrastructure has already exceeded 35 years since the first deployments and we expect the average lifetime will be much longer than 35 years based on the materials, technologies, and manufacturing processes used to produce modern, high quality optical fiber and. Fiber optic cables have a reputation for their prolonged lifespan, low maintenance need, and dependable quality. From FTTH optics to industrial applications, backbone transmission, and cloud data centers, fiber cables can last for decades under appropriate installation and handling. So, how often. After a fiber optic or premises cabling project is completed, there are almost always leftovers. Nobody can do an estimate that's 100% accurate, and being careful to ensure you have enough components to finish the job is really important, especially in an era of supply chain uncertainties and long. This article explores whether fiber optic cables will become obsolete and examines the factors influencing their longevity.