👉 Rule of thumb: Use single-mode for long reach; use multimode for short distances in the same data center. PVC: Basic indoor use; not for air ducts. Riser (OFNR): Vertical shafts between floors. These may be LC, SC, ST, or MTP/MPO connectors, each designed for a specific type of equipment. What Is a Fiber Optic Patch Cord? A fiber optic patch cord (fiber jumper) is: Typical applications: A patch cord is the “bridge” that connects two fiber devices and lets them talk to each other. ZION Communication supplies both standard patch cords and custom assemblies to match your equipment. Correct patch-cord installation is essential for maintaining low insertion loss, stable return loss, and long-term reliability in both indoor and outdoor fiber networks.