FOA CFOS/O case studies
FOA CFOS/O · Put your knowledge to work in context.
The FOA CFOS/O is the Fiber Optic Association's specialist certification in outside plant fiber optics, one of the CFOS specialist credentials that build on the association's base CFOT certification. FOA describes itself as an international non-profit educational association chartered to promote professionalism in fiber optics through education, certification and standards, and as an internationally recognized certifying body for fiber optics. The FOA CFOS/O case studies are 5 cases and about 2,334 words.
1Air-Blowing Stall at 860 m on a 1,200 m Duct Route
A crew is air-blowing a 48-fiber microcable (8.0 mm OD, 0.9 kg/m) into a proved 40/33 mm HDPE duct along a 1,200 m suburban route. The duct has two 90° swept bends, one with a 4 m radius, and was rodded and foam-pigged the previous day.
550 words, about 3 min2Bidirectional OTDR Splice Loss and IOR Fault Location
An OTDR trace at 1310 nm on a 12.4 km single-mode OSP link records a splice at 6.180 km as 0.42 dB from the A end and 0.05 dB from the B end. The fiber IOR is 1.468, but the OTDR was set to 1.500.
447 words, about 2 min3Field-Installable Connector and Fusion Splice Defects
At a building entrance, a 24-fiber single-mode OSP cable is terminated with field-installable SC/APC connectors. OTDR and light-source testing show three connectors with 0.85-0.95 dB insertion loss; the other 21 measure 0.20-0.30 dB.
428 words, about 2 min4Aerial ADSS Span Clearance and Hardware Selection
A utility plans a 300 m aerial span of 48-fiber ADSS cable across a two-lane road. The existing pole is 11 m tall; the proposed attachment is at 9.0 m.
440 words, about 2 min5Manhole Entry, Cable Bend Radius, and Pull Tension
A two-person crew arrives at a 1.2 m diameter, 4.5 m deep manhole to splice a 48-fiber cable. The gas detector shows 8% LEL and 12 ppm H2S; oxygen is 20.4%.
469 words, about 2 min