The intent of this procedure is to determine the crosstalk ratios between any two optical paths in a cable@ connectorized cable@ splice or similar device. In addition@ the device's contribution to the crosstalk in a system may be determined. The effectiveness of the material surrounding the optical conducting device in restricting light paths to other elements may also be measured. However@ note that the test methods of FOTP-180 should be used to measure crosstalk in fiber optic couplers (branching devices) and in similar devices of this class.