In order to diferentiate between the tubes in the cables and the optical fibres in a loose tube, the tubes and fibres (more precisely: the primary coating) are given diferent colours. Subject to technical modification. By adopting the TIA/EIA‑598C standard, you gain a universal “language” of colors that speeds identification, reduces miswiring, and enhances safety across cable jackets, connectors, buffer tubes, and splice trays. The following definition of “standard” can be found in the ISO/IEC Guide 2:1996, definition 3. 2: 'A document established by consensus and approved by a recognized body.