Use color coding for fiber types to quickly identify cables. Yellow indicates single-mode fiber, while orange and aqua mark multimode fibers. This guide covers everything you need to know about 4 core fiber, including its internal structure, TIA standard color coding, and how to choose the right type. What is a 4 Core Optical Cable? A 4 Core Optical Cable is a fiber optic cable that contains four individual optical fibers within a single. Before printing labels for a single item, determine the information that each label requires. Misidentification can cause downtime, disrupt essential services, and create safety hazards in data centers. Poor labeling can create serious risks. ” This standard is adopted by; Telcordia GR-20 – Generic Requirements for Optical Fiber and Optical.