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PROGRESSION CONSTRUCTION COORDINATOR II – III
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In what applications is a splice closure used? Splice Closures are used to protect optical fibers and splices against a full range of environmental changes in aerial installations or below ground in vaults. When preparing a fiber-optic cable for splicing, what is the purpose of removing approximately 2.5 cm (1 inch) of jacket and any armor that is present, from the end of the cable?When preparing a fiber-optic cable for splicing, what is the purpose of removing approximately 2.5 cm (1 inch) of jacket and any armor that is present, from the end of the cable? To access the cables rip cord and to check the cutting depth of the knife or ringing tool. What does water do to the glass core of an optical fiber? Water causes the glass core of the optical fiber to become opaque, which degrades the signal as its transported through the fiber. When preparing a splice closure, what should be done with the fiberglass rod strength member that runs down the center of loose-tube fiber optic cable? Trim the strength member back for convenience, but leave it long enough to be tightly clamped to a strain-relief lug in the closure. What is the purpose of splice trays inside splice closures? Splice trays are designed to provide protection for mechanical splices, fusion splice protectors, and optical splitters as well as provide storage for the required fiber slack.
How should the buffer tubes be secured in the closure? The buffer tubes should be secured with tie wraps to allow slight movement without pulling or stressing the optical fibers. How are optical splices secured in a splice tray? Retaining clips hold optical splices in place in a splice tray. What is the Purpose of Buffer tubes in a fiber optic cable? Buffer tubes protect and separate the optical fiber in smaller bundles When splicing fiber-optic cable, why is it a good safety practice to clean off fiber strippers and other hand tools after each use? To prevent the accidental transfer of fiber debris or fiber chips onto clean hands. Where would you expect to install a mid-entry splice in a fiber-optic cable network? A location where a select number of optical fibers need to be spliced, and the remaining buffer tubes and fibers remain untouched. Which type of fusion splicer is ideal for fiber-to-the-x (FTTx) splicing? The fixed V-Groove splicer. When would a mid-entry splice in a fiber-optic network be used?
The quality and attenuation value of a mechanical splice of optical fibers is dependent on which tool during the preparation process? The quality and attenuation value of the mechanical splice of optical fibers is dependent on the quality of the cleaving tool. What step should be performed at the beginning of every fusion splicing operation? Make a number of test splices to set up the fusion splicer and to verify the instrument's settings and calibration for both the environment and the type of fiber to be spliced. Which fusion splicer alignment method uses a camera to align the optical fibers before splicing? The profile alignment system (PAS) method. The National Electrical Safety Code (NESC) provides guidelines concerning which portion of the fiber- optic cable network? Minimum safety clearances between different conductors of overhead and underground electric supply and communications lines. What is a safety concern when aerial fiber-optic cable is installed between poles, even though there are no high-voltage power lines? The buildup of lethal amounts of static electricity on the fiber-optic cable that can discharge through a person on a ladder or some other conductor connected to ground. What is used in outside plant fiber-optic cable to protect and isolate the optical fibers from stress? Strength members and buffer tubes.
What is the purpose of grounding to earth? To protect against the adverse effects of lightning and assist in the reduction of static. What is the minimum amount of slack that must be provided for splicing fiber-optic cable in underground installations? 15 meters on both the inbound and outbound span. What information is documented at fiber-optic slack and splice locations? Incoming and outgoing sequential markings showing the cable's physical length. What can be attached to the pulling line to prevent the fiber-optic cable from twisting during installation? A break-away swivel. What are two critical factors for a successful installation of fiber-optic cable? Cable pulling tension and cable bend radius. What should be done to prevent the buildup of lethal amounts of static electricity on long lengths of aerial fiber-optic cable? Install grounding clamps, which connect the cable exterior and metallic messengers to a good solid ground at each pole site.
How is the high air speed blowing (HASB) method of installing fiber-optic cable in conduit different from other methods? There is no need for a pulling rope in the conduit before the cable is installed. Eliminating pulling lines using high air speed blowing (HASB) can achieve how much of a cost savings over conventional pulling techniques? More than 40%. When is it necessary to use the intermediate pull technique to install fiber-optic cable in conduit? When the cable route has multiple 90° bends throughout. When installing fiber-optic cable over coaxial cable, what should be done at the coaxial cable expansion loops? Secure the fiber-optic cable to the strand across the coaxial cable expansion loops using plastic cable ties or support straps. What are the two accepted methods for pulling fiber-optic cable off the cable reel as part of an aerial installation? The back-pull method and the drive-off method. What is an example of transport media in a telecommunications network?
Coaxial cable. Which answer best describes network topology? It's a sub-layer of network architecture that describes the physical and logical configuration of connected elements between the signal source and the network termination elements. What does a point-to-multipoint (P2MP) topology consist of? A P2MP topology consists of a host element connected through a splitter or optical coupler to two or more receiving elements. Which type of network topology allows troubleshooting a problem or switching around the problem to be accomplished easily from the central hub? Star. Which type of network topology has been focused primarily on alternative routing around cities and industrial areas? Ring. What is one reason why broadband cable operators install fiber-optic cable in stages instead of changing the infrastructure all at once? Changing the infrastructure all at once would cause too many service disruptions. What is the difference between the fiber-to-the-node (FTTN) and fiber-to-the-curb (FTTC) topologies?
What is a design option for a broadband cable network to maximize the use of its optical fiber resources? Leasing Spare fibers. Which of these items should be identified on a route map? Parks Which type of map contains node information? Design Map How many meters of slack cable are typically used in an aerial installation? 15 - 25 meters What is one example of a stipulation in a franchise agreement that would affect network design? A 100% fiber-optic network When activating a fiber-optic network, which acceptance-testing stage includes adjusting attenuation levels for the first time? During equipment activation What information should always be included in fiber optic network documentation?
Fiber assignments. Why might a technician who is troubleshooting an outage in an optical network want to refer to the networks as-built documentation? It will help the Technician determine specific cable lengths. Which of these are concerns for radio frequency over glass (RFoG) and, fiber-to-the-x (FFTx) systems? Consideration of how and who will provide AC power to the optical network terminal (ONT) at the customer premisis What is true of the following types of uninterruptible power supplies (UPS)? The offline type routes incoming power directly to connected devices and switches to battery backup during a power interruption Why is - 48 VDC (volts of direct current) with a positive ground used by the telecommunications industry? The reverse polarity is a means of mitigating electrolytic corrosion on the outside plant. Which of the following is true of a centralized power node? It can provide sufficient power for a fiber-optic node, including outside plant amplifiers and customer premises network interface devices (NID) for telephony service.
Gigabit-capable PON (GPON) Which type of passive optical network (PON) architecture was formed to develop a cost effective, high- bandwidth, easy-to-provision solution for connecting businesses, schools, libraries, and customer local area networks to the public internet? Ethernet PON (EPON) What is the wavelength allocation for video distribution (RF overlay) in broadband PON (BPON) access systems? Between 1,550 and 1,560 nm Which element of a passive optical network (PON) consists of a downstream (forward path) optical transmitter, an upstream (return path) receiver, and a multiplexer/demultiplexer? Optical line terminal (OLT) What is it about radio frequency over glass (RFoG) that made broadband cable operators envision using it to make a seamless transition from the legacy hybrid fiber/coax (HFC) architecture over to a gigabit- capable passive optical network (GPON) or Ethernet passive optical network (EPON)? RFoG can operate in parallel with GPON and EPON, operating independent of the PON communications protocols and data rates. What is the core objective of the Data Over Cable Service interface specification (Docsis) Provisioning of Ethernet passive optical network (EPON), or DPoE, access architecture? To make the EPON elements appear and operate as DOCSIS elements to the existing DOCSIS-based back office provisioning operations.
What is one of the requirements that have been identified for next-generation access network architectures? Expanded troubleshooting capability. What is the maximum data rate the XG-PON1 (10G-PON) access architecture supports in the upstream? 2.5 Gbps The 10G-EPON access architecture supports two data rates in the upstream: what are they? 1 Gbps and 10 Gbps What is a benefit of using a point-to-point (P2P) topology instead of a point-to-multipoint(P2MP) topology? P2P topologies are more stable than P2MP topologies. Which of the following describe optical time domain reflectometer (OTDR) nonreflective signatures? Fusion splices, macrobends, and microbends. Fusion splices, macrobends, and microbends. 1,310 nm and 1,550 nm. Which class of optical transmitter is the safest to the human eye? Class 1
Divide the speed of light in a vacuum by the speed of light through an optical fiber. The National Electrical Safety Code (NESC) requires drop cables to be placed at what minimum depth? 18 inches. When troubleshooting radio frequency over glass (RFoG) and passive optical network (PON) FTTx systems that use longer wavelengths, what is the common cause of higher losses that should be addressed? Macrobends and microbends caused by improper bending and pinching of cables and patch cords. Which of the following is true about fiber network restoration planning? Responsibility for update and control of the restoration plan document must be defined or it will quickly become obsolete and useless. What can happen inside fiber-optic equipment room facilities? Failures can typically arise at patch panels, somewhere in opto-electronic systems, and because of installation practices. How is a restoration posture for a fiber network acquired? The basic resources required to respond to a major system outage are documentation, technical skill, and basic troubleshooting/repair equipment and materials. What is an important consideration in structuring a flow chart of basic restoration activities? The restoration plan prescribes the sequence of events described in the flow chart.
Which of the following is true when establishing a timing sequence or communication flow for a restoration flow chart? As experience in emergency restoration deployment is gained via actual deployments or rehearsals, the sequence time chart becomes more detailed and realistic. Which of the following is an important piece of a restoration planning questionnaire? A useful question might be, "What is the time allowance for service restoration from notification of the problem to restored service?" What is true of a diagram of restoration responsibilities? A lead technician would likely document troubleshooting results. What is the best way to plan proficiency training for fiber restoration? It is often best accomplished by simulating a fiber-optic cable failure. What is the purpose of the call list with regards to fiber-optic restorations? To provide quick access to the proper departments and staff required for restorations. What is the safety standard for confined spaces? The ANSI Z117.7 standard covers confined spaces. What is the first order of business for the fiber-optic field restoration coordinator (FRC)?
What is an advantage of having slack fiber-optic cable? When available during a restoration, it decreases down time and repair costs and omits additional splice attenuation.
