Fiber Test and Maintenance Test Exam Questions And Answers Verified 100% Correct

Fiber Test and Maintenance Test Exam Questions And Answers Verified 100% Correct When programming an optical time domain reflectometer (OTDR) - ANSWER Configuration settings include index of refraction (IOR), pulse width, range, wavelength, dead zone, event dead zone, masking, noise floor, and loss variables. In optical time domain reflectometer (OTDR) terminology, - ANSWER Acceptance testing consists of checking two-point attenuation, the index of refraction vs. the actual cable length, and zooming in to correctly place markers. The optical fiber acceptance test - ANSWER Is the best opportunity to adjust the fiber's index of refraction (IOR) to match the sequential markings of the cable jacket prior to installation. What is the result of increasing (making wider or longer) the pulse width on an opticla time domain reflectometer (OTDR)? - ANSWER The OTDR's range increases and its ability to distinguish closely spaced events decreases. What is the best course of action for the optical time domain reflectometer (OTDR) operator when the distance measurement for a strand of fiber doesn't match the sequential distance markings on the outside of the cable jacket? - ANSWER Adjust the index of refraction (IOR) setting on the OTDR until the measured distance matches the sequential distance markings. What is the difference between a reflectance measurement and an optical return loss (ORL) measurement with an optical time domain reflectometer (OTDR)? - ANSWER A reflectance measurement measures an individual component and an ORL measurement measures the sum of all components. When cleaning the optical power of an optical time domain reflectometer (OTDR), which connector port requires the use of a 1.25mm swab? - ANSWER Lucent connector (LC) Optical time domain reflectometer (OTDR) signatures - ANSWER Include reflective, nonreflective, gain, roll-off, and ghost types. When performing an optical acceptance test, - ANSWER Organize the fibers by color, per the TIA-598-A standard. Choosing the appropriate optical measurement for post-installation fiber-optic span tests - ANSWER Includes splice loss, attenuation measurements of fiber segments, component reflectance, optical splitters, accumulated loss, dual wavelength testing, bidirectional testing, and pass/fail When testing a fiber-optic splitter with an OTDR what would cause all the splitter output ports to look the same on the OTDR's display? - ANSWER An equal percentage fiberoptic splitter with all the same drop lengths. What are possible causes of OTDR trace signatures? - ANSWER Connectors, mechanical splices, optical planar splitters, and fiber ends. What are possible causes of a nonreflective OTDR trace signature? - ANSWER Fusion splices, macrobends, microbends, and fused biconical taper (FBT) splitters Which OTDR configuration setting must always exceed the length of the span under test? - ANSWER Range. What type of OTDR trace results when two fiber strands with dissimilar cores are fusion spliced together? - ANSWER A gain and loss signature. What length of fiber should be encased in a dead zone box according to industry standards? - ANSWER 20 times the length of the OTDR's shortest pulse width. How can an OTDR operator compare an old fiber trace with a new one? - ANSWER Overlaying a new trace on top of a previously saved trace. What does the laser array diagram show? - ANSWER The number of optical transmitters, splitters, couplers, and receivers in the headend. Additional optical attenuation - ANSWER Can be obtained by use of an in-line optical attenuator. Some manufacturers provide a front panel interface allowing the user to add or remove optical attenuation. Digital channel signal testing - ANSWER Should be performed in both the downstream and upstream paths and should include bit error rate and modulation error rate performance measurements. Fiber-optic power meters used in fiber-to-the-home (FTTH) networks should be able to measure which of the following two additional wavelengths? - ANSWER 1,490 nm and 1,625 nm. What do optical power meters measure? - ANSWER The optical output power of the laser transmitter and the input optical power level at the receiver What is an optical return loss test set used for? - ANSWER Measuring the amount of reflected energy from the fiber's internal Rayleigh scattering and Fresnel reflections. An optical power measurement - ANSWER Of the input on most optical receivers used in the broadband cable industry is accomplished by including a DC voltage test point. What criteria should be met when setting up the optical return path? - ANSWER First, the technician at the receiver location (headend)should measure and document the optical input power level (measured in dBm) using a power meter Fiber node acceptance tests - ANSWER Include performance measurements such as carrier-to-noise ratio (C/N), composite second order (CSO), composite triple beat (CTB), and hum modulation. Which description of fiber documentation below is correct? - ANSWER The fiber route diagram is a quick reference diagram of the fiber distribution network What do effective fiber-optic restoration plans acknowledge? - ANSWER Three separate types of activities: identification, location, and resolution. When working with specialized tools to troubleshoot and fix a fiber-optic system - ANSWER An OTDR transmits pulses of light into the fiber, then detects and measures the amount of reflected light. In regard to the different fiber-optic test sets, which of the following statements is true? - ANSWER The optical return loss test set is used to measure the amount of reflected energy caused by Fresnel reflections. Regarding the various pieces of fiber-optic troubleshooting test equipment, - ANSWER Optical power meters determine the overall loss of an optical fiber, but the OTDR can display the fiber's loss characteristics throughout. As you begin to identify trouble within fiber-optic systems, it's important to consider which of the following? - ANSWER No matter how complex, all systems are composed of point-to-point links consisting of a source(transmitter) and a detector (receiver) connected by an optical fiber. When testing the optical receiver portion of an optical link with an optical power meter, - ANSWER Disconnect the jumper from the input to the receiver, clean the optical connectors, and connect the receiver jumper to the power meter.