92Patch cordA fiber that has connectors at both ends is called a patch cord. A patch cord connects one optical deviceto another for signal routing. Patch cords fall into single-mode and multi-mode patch cords.• Single-mode patch cord—The jacket is yellow. It permits transmission over longer distances.• Multi-mode patch cord—The jacket is orange. It permits transmission over shorter distances.Patch cords are classified into SC, LC, FC, and so on based on interface type. The length of a patch cordcan be 0.5 m (1.64 ft), 1 m (3.28 ft), 2 m (6.56 ft), 3 m (9.84 ft), 5 m (16.40 ft), 10 m (32.81 ft), and soon.Pigtail cordA pigtail cord is an optical fiber that has an optical connector on one end and a length of exposed fiberon the other. The end of the pigtail is fusion spliced to a fiber, connecting the fiber cable and transceiver.Pigtail cords fall into single-mode (yellow) and multi-mode (orange), and can also be classified into SC,LC, FC, and so on based on interface type.Fiber connectorFiber connectors are indispensable passive components in an optical fiber communication system. Theyallow the removable connection between optical channels, which makes the optical system debuggingand maintenance more convenient and the transit dispatching of the system more flexible.Figure 50 SC connectorFigure 51 LC connectorPrecautions• Make sure the fiber connector and fiber type match the transceiver module type.
