OS2 fiber supports distances up to 120 km and beyond without active signal regeneration, with extremely low attenuation (typically ≤ 0. 35 dB/km at 1310nm) and superior bandwidth potential. Multimode fiber features a larger core that allows multiple light paths (modes) to travel. This article explains the core differences between OS1 and OS2 singlemode fibers, as well as OM3, OM4, and OM5 multimode fibers—to help OEM clients, installers, and data center engineers make informed decisions. This guide dissects their technical nuances, evolution, and real-world applications. Fiber optic cables used in telecommunication are broadly categorized into two types – Multimode fiber and Single-mode fiber cables. The multimode fiber cable is prefixed with 'OM' and the Single-mode fiber cable is prefixed with 'OS'. In ISO/IEC 11801 and EIA/TIA standards five types of Multimode –. OS2 Fiber Optic Cables are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for OS2 Fiber Optic Cables. For jobs in that range, there are usually OM designs that are more cost-effective.