Tight buffer, distribution, and breakout cables in LSZH and PVC — single mode and multimode for in-building networks. Although they can do the same job in some instances, the different construction methods make each of them better suited to certain tasks and budgets. The core of the fiber is made of a highly transparent material, which allows the light to travel through it with minimal attenuation or loss of signal. While copper-based solutions (such as Cat5e/Cat6 for twisted pair or RG-6 for coaxial) have long served as workhorses for local and. Fiber optic cabling is the backbone of modern high-speed networks, carrying data as pulses of light across campuses, data centers, metro links, and long-haul infrastructure.