Unlisted optical fiber cables are permitted to be installed within a building provided they originate outside the building. The Fiber Optic Association, Inc. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. Lead-in fibers are useful to locate short distance faults and making loss/attenuation measurement in real time mode. This document explains how to use lead-in fibers. Testing with an OLTS/LSPM can be conducted at one or more wavelengths, but at a minimum, it is recommended that testing be performed at the wavelength that the network will operate (for example 850 nm for a laser-optimized fiber network where a VCSEL will be used for data tra smission). To obtain accurate measurements for pre-terminated fiber cables, follow these steps: Cable Route Measurement: Measure the pathway length along the planned cable route using a measuring tape or laser distance meter. 110 in remote areas with lack of usual infrastructure for installation including the procedures of cable-route planning, cable selection, cable-installation scheme selection. bers to be terminated from cable to cable or from cable to pigtail assemblies.