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Fiber optic 123 Questions With
Correct Verified Answers
A fiber optic inspector microscope can increase the danger of high powerd light source by focusing the light out of a fiber into your eyes. - โ โ True A fiber optic power meter measures absolute power in dBm (dB reference to 1 mw) and when a light source measures insertions loss in dB. - โ โ True Confining light in a material by surrounding it by another material with lower refractive index is the phenomenon of - โ โ Total internal reflection The largest cause of attenuation in am optical fiber is - โ โ Scattering When we say 62.5/125 fiber what does "62.5" means? - โ โ Core size, diameter in microns When we say 50/125 fiber what does "125" mean? - โ โ Cladding size the diameter in microns An older multimode fiber design with a 50/125 micron core is now option in premises cabling system because it - โ โ Has a higher bandwidth which gives more distance capability with gigabit network In multimode fiber the attenuation of the fiber is __________ at 850 nm that's 1300 nm - โ โ Higher
Which of the following represent a singlemode fiber size? - โ โ 9/ Singlemode fiber has ______ bandwidth in both multimode and singlemode fiber - โ โ Greater What form of dispersion affect bandwidth in both multimode and singlemode fiber - โ โ Chromatic dispersion Most plastic optical fiber are - โ โ Large core step-index When you strip singlemode or graded index multimode mode glass fiber you are removing the - โ โ Primary buffer coating The outermost layer of protection for an optic fiber cable is - โ โ The jacket The proper method of pulling optical fiber is to attach the pull wire or tape to the - โ โ Strength members According to the text HYBRIDcables refer to cable that contain - โ โ Both singlemode and multimode optical fibers What type of fiber cable design allows for large number of fibers with ultra high density low cost small size diameters? - โ โ Ribbon When flexibility and ease of termination are priory the type of cable best suited is - โ โ Tight buffer What standard covers flammability requirements of fiber optic cables for installation in premises application - โ โ NEC 770. According to the text Composite cable refer to cable that contain - โ โ Both optical fiber and copper must be grounded
Fiber optic joints connectors or slices should have_________. - โ โ Hight mechanical strength and low loss To reduce _________ as well as loss the end of a connector is polished to a PC physical contact finish. - โ โ Reflectance Factory termination such as used for making patch cords generally use what method of attaching the connector to the cable. - โ โ Epoxy/polish What connector style is now specified in the TIA premises cabling standard TIA-568B.3? - โ โ Any connector standardize by FOCIS document. According to the text the connector in the following list with the BEST lower REFLECTANCE is the - โ โ SC-APC _______ termination type connectors do not need to be polished. - โ โ Cleave and crimp prepolished/splice Splices are most often used for - โ โ A permanent joint between two fiber If you need to joint two fiber together with the lowest loss and least amount of bak reflection which of the following should you choose? - โ โ Fusion splice Mass fusion splicing is normally used on what style of cable? - โ โ Ribbon Prior to cable plant acceptance or system turn-up standard require that _______ is use to measure the cable plant LOSS to ensure it is within the loss budget. - โ โ Light source and power meter (LSPM or OLTS
For insertion loss testing the fiber optic test source must match the _______ of the transmission system to make correct loss measurements. - โ โ Fiber type wavelength According to the text is is recommended that reference test cable be choose for their - โ โ LOW LOSS Which of the following parameter cannot be measured by OTDRs optical time domain reflectometer in fiber optic network> - โ โ Transmitter and receiver power For safety a fiber optic technician or installer should always wear _____ she working with optical fiber - โ โ Eyes protection Installation of fiber optic may require use of chemicals that can be considered hazardous. To ensure chemicals are used properly consult the appropriate _____. - โ โ Material Safety Data Sheet (MSDS During fiber optic installations the most common danger is cause by ______. - โ โ Fiber scraps or shards from the stripping and termination processes. What the fiber type is used in each of these applications? - โ โ Telecom outside plant SINGLEMODE Telecom FTTx SINGLEMODE CATV hybrid fiber coax network SINGLEMOde LAN fiber the the desk MULTIMODE GRADED-INDEX Consumer digital audio PLASTIC OPTICAL FIBER Resistance to water damage - โ โ Gel-filled and blacked cable
isopropyl alcohol Fiber optic power meter - โ โ Source or receiver power Source and meter or optical loss test set - โ โ Insertion loss Visual fiber tracer - โ โ Continuity cable tracing polarity Visual fault locator - โ โ Fault location close to end or cable OTDR - โ โ Fault location splice loss Inspection microscope - โ โ Connector fault polish scratche ect Fiber size - โ โ um or micron Wavelength - โ โ nm or nanometer Bandwidth - โ โ MHz or GHz Loss - โ โ dB Absolute power - โ โ dBm Cable jacket outside diameter - โ โ mm or inches Cable length - โ โ Feet or meter The place where backbone cabling and horizontal cabling meet is called the - โ โ Horizontal Cross Connect According to the current standards, the recommended topology for a cable layout is the topology - โ โ Star To a Network Cabling Specialist the acronym MAC means - โ โ Move, Add and Change
How many grades of cable are recognized for residential use - โ โ 2 Acceptable attenuation for fiber optic splice is - โ โ 0.3dB In which grade of cable is fiber optic cable classified - โ โ 2 When pulling fiber optic cable, there should be no more that _____ bends - โ โ 2 If you have to breach a firewall, when you are done you must: - โ โ Replace fire stopping materials If a conduit run is longer that 30 meters, install a: - โ โ Pull box The Power Meter used in the course has one operating wavelength - โ โ False Optical Enclosures store only cables that are in use - โ โ False Bend Radius defines the amount of bend that a cable can take before it is damaged - โ โ True To find out how far into the cable a problem may be, you can use a(n): - โ โ OTDR Most of the attenuation in a fiber optic system is caused by: - โ โ The connectors Mismatched fiber diameters lead to signal loss because: - โ โ Signals traveling from narrow to wide will be OK, but signals traveling from wide to narrow will not.
If a cleaved fiber appears like a light house when rolled in your fingers - โ โ Cleave it again Blank is when all of a mode of light is reflected down a fiber. - โ โ Total Internal Reflection Blank is the bending of light as it moves through different media - โ โ Refraction Blank is how light travels after it strikes an object and bounces off. - โ โ Reflection Blank is a number that is at least one that represents a comparison of how fast light travels in different media - โ โ Index of refraction Modal Dispersion is described as - โ โ Light reflecting on many different angles inside a fiber optic cable. The beam of light must be within the in order to enter the fiber and to be passed along the length of the fiber - โ โ Cone of Acceptance The type of splice that has the lowest attenuation is - โ โ Fusion If you have a cable with bundles of 6 fibers each, The fibers in Bundles 3 are numbered - โ โ 13- If the NEC says: You should.... Then it's - โ โ Advisory Which of the following is an optical detector - โ โ APD What type of cable can not be substituted for Conductive Riser Cable - โ โ Optical Fiber Conductive A 3dB gain in light brightness is - โ โ twice the brightness
On a blue print this symbol means - โ โ Cross connect Name the two most popular fiber optic splicing methods - โ โ Fusion and Mechanical Which fiber optic splices you can see light and adjust the splice accordingly - โ โ Mechanical The Fiber Cleaving Puck is - โ โ Used for securing the fiber while it is cleaved for splices Connectors designed to take up less room in an installation, allowing for more fibers to be terminated in the same space, are called - โ โ Small Form Factor Duplex connectors contain fibers - โ โ 2 This type of optical cable has the lowest protection rating - โ โ Restricted Application In fiber optics, A device that attaches two connectors of different type(for example: ST to SC) is called a - โ โ Hybrid adapter Fibers terminated in a cabinet or face plate are wrapped around a framework several times to maintain the proper - โ โ Bend radius
