This procedure can be used to measure the optical loss between any two passively-connected points, including end terminations, of a multimode optical fiber cable plant. The optical fiber cable plant, as the term is used here, may consist of optical fiber cables, connectors, mounting panels, jumper cables, and other passive components, but may not include active components. An example of the cable plant could be a portion of an LED-based local area network. This could include optical switches or couplers, but would exclude gain elements in the connected path.