Overhead optical cables are mainly used for secondary trunk lines and below. If we can reduce failures and increase the service life of optical cables by carrying out communication optical cable construction in a. Overhead fiber optic cable are designed to be suspended from utility poles or dedicated structures, leveraging existing aerial infrastructure to minimize construction costs. Key advantages include: Cost. This TB is a thorough overview on OPGW encompassing its project management, its designs, its testing, its installations and its maintenance since its creation in the early 1980s.