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The FOT-ISP exam has 75 questions and runs 2 hours.
These 10 free FOT-ISP questions are organized by exam domain, so you can see how each part of the Fiber Optics Technician-Inside Plant (FOT-ISP) blueprint is tested. Reveal the answer and explanation under each question.
During a 1310 nm insertion-loss test, the measured one-cord reference is -4.0 dBm. The source data sheet lists a nominal output of -3.0 dBm. With the source setting and source connection undisturbed, the complete link measures -6.5 dBm. What insertion loss belongs in the acceptance record?
Correct answer: A - 2.5 dB
Two single-mode fibers have the same nominal core and cladding diameters but different specified mode-field diameters at 1310 nm. A technician obtains a sound fusion splice with well-aligned core centers. Which statement correctly describes the remaining possibility of intrinsic splice loss?
Correct answer: A - Their guided optical fields can overlap incompletely even when the core centers and claddings are accurately aligned.
A previously accepted single-mode link develops excess loss immediately after slack is redressed in a splice tray. With the link isolated from active equipment, OTDR testing reveals a new nonreflective loss at the tray that is much greater at 1550 nm than at 1310 nm. No fibers were cut or respliced. Which fault best fits these findings?
Correct answer: C - A tight slack loop causing macrobend loss.
An installer sees no light at a disconnected fiber and prepares to examine it with a direct-view microscope. The remote transmitter's status is unknown. What should the technician supervising the work do immediately?
Correct answer: B - Prevent direct viewing; isolate the source and verify the fiber is dark.
The specified optical fiber cable is nonconductive and will run exposed through a building's environmental-air plenum. No listed raceway or other installation exception is being used. Which jacket marking identifies the required plenum-rated cable?
Correct answer: D - OFNP
Freshly stripped and cleaned fibers repeatedly trigger a large cleave-angle warning before the fusion arc starts. The splicer's V-grooves and clamps are clean, the fibers are seated correctly, and the correct fiber program is selected. Which response addresses the most likely problem?
Correct answer: C - Inspect the cleaver blade and clamps, then prepare fresh cleaves.
A single-mode patch panel presents an SC/APC connection, while the receiver requires SC/UPC. Both interfaces must remain in place. Which patch-cord configuration provides compatible endface mating at both ends?
Correct answer: D - SC/APC at the panel; SC/UPC at the receiver.
One optical network terminal (ONT) in a passive optical LAN reports optical loss of signal. Its local power is normal. The other 15 ONTs on the same 1:16 splitter and optical line terminal (OLT) port remain registered with normal downstream optical levels. Where should fault isolation begin?
Correct answer: D - At the affected ONT, by measuring the downstream optical power arriving on its fiber.
A link's transmitter output is specified from -5 to -1 dBm, and its receiver accepts inputs from -17 to -3 dBm. The complete passive path loses 8.0 dB. The design requires an additional 3.0 dB reserve, and all reach and dispersion requirements are satisfied. Which power-budget assessment is correct?
Correct answer: C - Accept: 1.0 dB remains beyond the required reserve.
At the far end of a single-mode cable, an OTDR trace shows a connector reflection followed immediately by the noise floor. An adequate launch fiber is already connected at the near end. The technician needs to measure the far-end connection's loss, not merely locate it. What is missing from the setup?
Correct answer: B - A matching receive fiber extending beyond the far-end connection's attenuation dead zone.
The FOT-ISP exam also covers these domains. Drill them in the full free practice test:
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