Fiber Install and Activation 100% SOLUTIONS REVISED 2023//2024

Fiber Install and Activation 100% SOLUTIONS REVISED 2023//2024 Which standards organization is considered to be the creator of the worlds' most recognized communications standards, known as "recommendations"? - ANSWERS The International Telecommunications Union (ITU) In which component in a fiber-optics communication system do changes to the intensity of the optical signal occur? - ANSWERS The optical transmitter What is a drawback of using Fabry-Perot (F-P)lasers in high-speed data (HSD) networks? - ANSWERS The emission of a number of discrete wavelengths or side modes. Why are laser diodes most effective when coupled to singlemode fiber? - ANSWERS Its high coupled power, directionality, and speed. What are the factors that contribute to an optical receiver's sensitivity? - ANSWERS Noise, responsivity, response time, linear response, back reflection, optical detector. What is a positive-intrinsic-negative (PIN) diode? - ANSWERS 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? - ANSWERS Noise What function does the detector in an optical receiver perform? - ANSWERS 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? - ANSWERS Nonlinear operation resulting in distortion, data errors, and signal loss. What is a characteristic of light in a laser beam? - ANSWERS 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 - ANSWERS Involves the use of a node transponder that continuously monitors a number of critical functions. Digital return path transmissions - ANSWERS Use dense wavelength division multiplexing (DWDM) digital return transmitters in hub-to-headend architectures. What is channel bonding? - ANSWERS A 3.0 revision to DOCSIS that significantly increases upstream and downstream transport data rates. What is MPEG? - ANSWERS A universally accepted standard for digital television, first released in 1992. Which of the following is true about optical nodes? - ANSWERS 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 - ANSWERS Require a call management server, media gateway, signaling gateway, billing system, and CMTS. In a centralized server video-on-demand architecture - ANSWERS 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? - ANSWERS Local ad insertion is performed usually by a video server. In regard to providing high-speed data service, - ANSWERS 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? - ANSWERS 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? - ANSWERS 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? - ANSWERS The ITU-T G.657 bend-insensitive fiber (BIF) What are the primary causes of intrinsic loss in single-mode fiber? - ANSWERS 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? - ANSWERS 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? - ANSWERS At connections and mechanical splices where the signal source is entering or exiting the cable. Chromatic dispersion is a combination of which two dispersions? - ANSWERS Material and waveguide d