Usually single mode fiber optic patch cord are with 9/125 fiber glass and is yellow jacket color, multi mode fiber optic patch cord are with 50/125 or 62.5/125 fiber glass and is orange color. Fiber optic patch cords are used for linking the equipment and components in the fiber optic network. They are with various kinds of fiber optic connector types. The fiber optic patch cord types are classified by the fiber optic connector types. There are PC, UPC, APC type fiber patch cord; they are different because of the polish of fiber connectors.