OM4 multimode fiber optic cables have a core diameter of 50 microns, which allows them to transmit data over distances of up to 550 meters at a speed of 40 gigabits per second (Gbps), and up to 150 meters at 100 gigabits per second (Gbps). The color code for fiber optic cables is regulated by the This color coding is important for identifying individual fibers within a multi-fiber cable and for maintaining consistency in fiber. There are different types of fiber optic cables because each type is optimized for specific applications that have unique requirements for bandwidth, transmission distance, and environmental factors. Connector types play a crucial role in selecting the right cable for specific applications, as different connectors are designed for various environments, space constraints, and high-bandwidth. This standard is adopted by; Telcordia GR-20 – Generic Requirements for Optical Fiber and Optical Fiber Cable, Telcordia GR-409 - Generic Requirements for Indoor Fiber Optic Cable, the Rural Utility Service within 7 CFR1755. 900, the Insulated Cable Engineers Association Incorporated, (ICEA). Optical fiber works by guiding light down the fiber core due to variations in index of refraction between the core and cladding. Not included are many proprietary designs. Designs under development are listed below.