Fiber Install and Activation questions and answers 2023

Fiber Install and Activation questions and answers 2023Which standards organization is considered to be the creator of the worlds' most recognized communications standards, known as "recommendations"? The International Telecommunications Union (ITU) In which component in a fiber-optics communication system do changes to the intensity of the optical signal occur? The optical transmitter What is a drawback of using Fabry-Perot (F-P)lasers in high-speed data (HSD) networks? The emission of a number of discrete wavelengths or side modes. Why are laser diodes most effective when coupled to singlemode fiber? Its high coupled power, directionality, and speed. What are the factors that contribute to an optical receiver's sensitivity? Noise, responsivity, response time, linear response, back reflection, optical detector. What is a positive-intrinsic-negative (PIN) diode? An optical detector with current flow that is linear to the intensity of light photons, with one electron/hole pair created for every absorbed photon until saturation. What does the amplification process in an avalanche photodiode (APD) introduce into the electrical output of an optical detector? Noise What function does the detector in an optical receiver perform? Conversion of an optical carrier to an electrical signal, and demodulation of the modulated optical carrier. What happens if the optical signal exceeds the maximum specified input power into a photodetector? Nonlinear operation resulting in distortion, data errors, and signal loss. What is a characteristic of light in a laser beam? The laser beam consists of a limited range of wavelengths (monochromatic), with all light waves in phase (coherent light). Monitoring the status of optical nodes Involves the use of a node transponder that continuously monitors a number of critical functions. Digital return path transmissions Use dense wavelength division multiplexing (DWDM) digital return transmitters in hub-to-headend architectures. What is channel bonding? A 3.0 revision to DOCSIS that significantly increases upstream and downstream transport data rates. What is MPEG? A universally accepted standard for digital television, first released in 1992. Which of the following is true about optical nodes? They contain four main sections: the optical receiver, the RF amplifier module, the reverse optical transmitter, and the DC power supply. Internet protocol telephony systems in broadband cable networks Require a call management server, media gateway, signaling gateway, billing system, and CMTS. In a centralized server video-on-demand architecture The number of servers needed for video content storage is smaller than in the distributed server architecture. Which of the following statements about local ad insertion is true? Local ad insertion is performed usually by a video server. In regard to providing high-speed data service, The CMTS can provide a data transfer rate up to 38 Mbps, using 256-QAM in a single 6Mhz channel. Which of the following is true about the SONET transmission standard? SONET is the North American standard used for telephony applications. Why was the zero-dispersion point in single-mode fiber moved to 1,550 nm? To take advantage of the low intrinsic absorption and lower attenuation at 1550 nm in single-mode fiber What type of single-mode fiber is intended for fiber-to-the-home installations? The ITU-T G.657 bend-insensitive fiber (BIF) What are the primary causes of intrinsic loss in single-mode fiber? Material absorption and Rayleigh scattering. The phenomenon, total internal reflection, is what enables an optical fiber to guide light. What characteristic of optical fiber causes total internal reflection? The difference in refractive indexes, between cladding and core, causes light to be reflected off the cladding and back into the core along the optical fiber. Where would you expect Fresnel reflections to occur in a fiber-optic network? At connections and mechanical splices where the signal source is entering or exiting the cable. Chromatic dispersion is a combination of which two dispersions? Material and waveguide dispersion. What is one advantage and one disadvantage of single-mode fiber with a large mode field diameter? The larger the MFD, the easier it is to splice and connectrorize the fiber, although it becomes more sensitive to bending losses. What is the current standardized outside diameter of the cladding of single-mode fiber? It is 125 µm, with an accuracy of ±1 µm. What do diameter differences between spliced fibers look line on an optical time domain reflectometer? Gain in one direction and high loss in the opposite direction. Besides protection, what else must the coating on an optical fiber do? Function over a wide temperature range' be compatible with cable gels adhere to the glass cladding over the lifetime of the cable; and be mechanically strippable for splicing operations. How do technicians know the specific type of single-mode fiber used in a particular project? They have read the project's specification records.