Optical fiber is used by many telecommunications companies to transmit telephone signals, internet communication, and cable television signals. Researchers at Bell Labs have reached a record bandwidth–distance product of over 100 petabit × kilometers per second using fiber-optic communication. This article enumerates several advantages of delivering cable television on optical fiber, with prime focus on increased throughput and higher quality images. It defines a minimum leve e fiber optic cabling extends between buildings. Although the standard covers premises installations, many of the provisions included here ar SI/ NFPA 70, the National Electrical Code (NEC). Fiber cables come in two main types: Single-Mode Fiber: Designed for long-distance data transmission.