The LC-500 is a 500m launch cable that is used in conjunction with singlemode OTDR’s to compensate for the OTDR deadzone when measuring long cable spans.
Allows the technician to accurately characterize the insertion and return losses of the input and output connectors of a fiber link
Use of the LC - 500 Launch Cable When long fibers are being measured, the deadzone of the OTDR becomes longer because a wider pulse width is used to launch more light into the fiber. The increased amount of light allows the OTDR to probe longer fibers and links that may have loss events such as bad connectors or splitters. If a launch cable is not used the longer deadzone of the OTDR can overlap and mask events at the b eginning of the fiber under test.