Single-mode fiber optic plenum cables use OS2 9/125 fiber for long-distance signal transmission, including runs beyond 1,000 feet, and require components compatible with single-mode fiber. Multimode plenum cables use OM3 50/125 fiber and support 10 Gbps signals for distances up to 1,000 feet, making them well suited to many data, audio, and video installations.

Choose simplex for one fiber path, duplex for separate transmit and receive paths, breakout when individually jacketed fibers will be routed or terminated separately, and multi-strand cables when a project needs several fiber paths in a compact plenum-rated cable. Then select single-mode OS2 for longer-distance links, or multimode OM3 for applications such as data, audio, and video where the distance and bandwidth requirements fit its specifications.

Fiber optic plenum cables are designed for installation in plenum spaces used for environmental air returns, as well as in ducts and underground conduit, when the cable’s listing and construction match the application. Follow the cable manufacturer’s instructions and applicable local codes, including NEC Article 770 requirements for plenum installations, routing, support, and terminations.

Match the cable’s fiber type, strand configuration, and connector system to the equipment, using single-mode OS2 components with 9/125 fiber and multimode OM3 components with 50/125 fiber. Confirm that the transceivers and network devices support the cable’s mode, simplex or duplex layout, connector interface, and planned transmission requirements before installation.