ROC 3 Part 1 Practice Exam

These questions are part of the practice quiz. Start practicing

• What issue can arise from the improper use of nylon tie wraps on fiber-optic cables?
• What type of OTDR trace results from fusion splicing two fiber strands with dissimilar cores?
• In concatenated coding, which part arranges transport stream packet data into a matrix?
• How does an input converter compensate for fluctuations in received signal strength?
• Which factors contribute to a nonreflective OTDR trace signature?
• What is a common cause of higher losses in RFoG and PON FTTx systems?
• Why is it important to define responsibility for the restoration plan document?
• What does the OTDR help to identify when troubleshooting a fiber-optic system?
• What are the most common single-mode wavelengths used by OTDRs?
• Which of the following is true regarding forward and return sweeps?
• What is the desired output characteristic from a modulator?
• What is the key benefit to using a DOCSIS-based cable modem termination system (CMTS)?
• What is a significant concern when implementing passive combining?
• What typically comprises the user key in entitlement control messaging?
• When developing a fiber-optic network maintenance plan, what responsibility must be considered?
• What should be avoided when planning for fiber-optic restoration?
• What is the first responsibility of the fiber-optic field restoration coordinator (FRC)?
• What does the term “dead zone” refer to in optical fiber testing?
• What is the result when a fiber segment has excessive attenuation?
• Which of the following is true regarding FCC proof-of-performance?
• What role does maintenance play in ensuring optimum performance in a fiber-optic network?
• Which of the following is true regarding the return path?
• In the headend, the serial data interface (SDI) patch panel is used to route the SDI signal from a local origination studio to what device?
• What is the primary concern regarding improper bending of cables in fiber-optic systems?
• Which system component regulates output levels to avoid laser clipping?
• In fiber optics, what does PMD stand for?
• Which of the following is true in regards to the operating parameters of a fiber node?
• Where should the final test point be located in a headend?
• How is the index of refraction (IOR) calculated?
• According to the National Electrical Safety Code (NESC), drop cables must be placed at a minimum depth of how many inches?
• What device converts the optical signal to RF at the headend?
• Which component would be primarily focused on signal isolation?
• What can be located at the start of the knee on an OTDR trace?
• What is the purpose of an optical return loss test set?
• What should an OTDR operator do if distance measurement does not match cable jacket markings?
• What is a primary feature of the ALOHA protocol compared to TDMA?
• When the pulse width is increased on an OTDR, what is the result?
• In a fiber network, restoration planning is primarily aimed at:
• What is a key component to ensure effective communication during restoration?
• Who typically documents troubleshooting results in a restoration responsibilities diagram?
• Which performance measurements are included in fiber node acceptance tests?
• What features are combined into an optical loss test set?
• What is a key benefit of using an OTDR in fiber-optic troubleshooting?
• Which statement is true regarding additional optical attenuation?
• What function does a Rate Shaper perform in a digital signal?
• What is the primary purpose of the intermediate frequency (IF)?
• What does the laser array diagram indicate?
• What should be the criteria for forward RF output levels at the node?
• What should inspections of fiber-optic aerial and underground plants include?
• What is the first step to diagnose an isolated problem in a fiber-optic system?
• How does a DTV signal's decoder include closed captioning data when converting to analog?
• In PID assignments, which table includes all programming/services with assigned PIDs for scrambled programs?
• What role does backscatter play in OTDR measurements?
• What is typically affected by excessive levels on the return path?
• What is the main purpose of conducting a fiber-optic acceptance test?
• How does the DTV decoder handle dynamic range compression?
• Which class of optical transmitter is considered the safest for the human eye?
• What describes the staffing of network operation centers (NOC) in large metropolitan areas?
• What is the definition of multicasting in the context of OTA broadcasting of DTV content?
• What is true regarding aerial span replacements in outside plant fiber-optic restorations?
• Fiber-optic power meters used in FTTH networks must measure which two wavelengths?
• What length of fiber should be placed in a dead zone box according to industry standards?
• Which statement is true regarding optical fiber identifiers?
• According to standards, what is the bandwidth situation for a 256-QAM signal?
• What does acceptance testing in OTDR include?
• How does experience affect the timing sequence for restoration flow charts?
• What is preserved in the PSIP of digital video signals?
• What type of interface is common on an optical power meter besides RS-232 ports?
• What are possible causes of a reflective OTDR trace signature?
• Before conducting a fiber test with an OTDR, what is essential to confirm?
• What is a critical component to adjust during the acceptance testing process of optical fibers?
• When using the center cut option to convert an HDTV signal to SDTV, what portion of the picture is typically cropped?
• What safety standard covers confined spaces?
• How have optical power meters evolved in terms of functionality?
• What does the optical return loss test set measure?
• What type of information must be preserved and distributed along with digital video signals?
• What do most models of laser light sources use to indicate operational status?
• What could happen if heavy ingress occurs in the return path?
• What do optical power meters primarily measure?
• What is a desirable feature of a routing switcher?
• What was the original application of the proprietary digital headend expansion interface (DHEI) protocol?
• Which of the following describes optical time domain reflectometer (OTDR) nonreflective signatures?
• What happens to the OTDR's ability to distinguish between events when pulse width is widened?
• What is the optical channel spacing of coarse wavelength division multiplexing (CWDM) systems?
• What can facilitate documentation during fiber restoration?
• To comply with manufacturer noise and distortion specifications, the modulator output level should be:
• What is one purpose of the convolutional coding in concatenated coding schemes?
• For which wavelengths should optical power meters be calibrated when testing fiber-to-the-user (FTTx) installations?
• A wavelength-isolating power meter is most commonly used in which type of installation?
• What issue does the Nyquist filter help to mitigate in signal transmission?
• What do optical power meters evaluate in a fiber-optic system?
• What is the term for the sum or difference frequencies generated when a local oscillator and input signal are mixed?
• What equipment can be used to identify problems in the fiber-optic network?
• What is the device that adjusts the data rate in a digital signal for optimal performance?
• What is the practical data rate of the asynchronous serial interface (ASI) after accounting for synchronization bytes?
• What key requirement must be met regarding safety codes during fiber restoration?
• What role does Automatic Gain Control serve in signal processing?
• What do test points help a technician diagnose without impacting?
• Who typically monitors critical network functions in NOC operations?
• Which test equipment determines the loss characteristics throughout a fiber?
• To make accurate measurements of reflective events, which method is preferred?
• How is the frequency of an analog channel identified?
• Which of the following can be a potential problem during aerial installations of fiber-optic cables?
• If return path levels are excessively high, what problem may occur?
• Which description accurately reflects fiber documentation?
• What must the entitlement management message (EMM) receive from the CA controller for decryption?
• What is a carrier in the context of signal modulation?
• Differential gain and phase errors primarily affect what aspect of the picture?
• When measuring transmit and receive power with an optical power meter, what must the technician ensure?
• Which configuration setting is NOT essential when programming an optical time domain reflectometer (OTDR)?
• What is true regarding reflections in an optical fiber?
• Which of the following is not a feature of Optical Time Domain Reflectometers (OTDR)?
• Modulator output levels should be set within what range?
• Where are Emergency Alert System (EAS) messages received from authorized sources delivered in the headend?
• What is required when handling micron or sub-micron dimensions?
• What is the typical data rate for an SDTV MPEG-2 signal after transcoding from HDTV?
• What is essential for acquiring a restoration posture for a fiber network?
• Which of the following is true regarding optical time domain reflectometers (OTDR)?
• What must a technician reference when measuring end-to-end attenuation?
• When testing a fiber-optic splitter with an OTDR, what would cause all splitter output ports to appear the same on the display?
• Which device transmits pulses of light into the fiber and detects the amount of reflected light?
• What is the term for the CMTS's ability to control the output level of customer premises equipment?
• When should the headend combining network design be reevaluated?
• Which of the following is true regarding dense wavelength division multiplexing (DWDM) systems?
• Which OTDR configuration setting must always exceed the length of the span under test?
• What common networking protocol is used as cable services transition from broadcast to switched services?
• When are splice points in the MPEG-2 Transport Stream created?
• Which type of testing would likely reveal issues with microbending in fiber optics?
• What is unique to a fiber break locator?
• What is a consequence of damage to the jacket of a fiber-optic cable during installation?
• What is the primary use of an optical fiber in communication?
• Which measurement is easier and more accurate when identifying reflective events?
• Which of the following ensures accurate measurements when using an OTDR?
• In OTDR terminology, what is 'dead zone' referred to?
• Why are digital upconverter input levels critical?
• What is the preferred method for planning proficiency training for fiber restoration?
• What is a potential consequence of not managing levels on the return path?
• What ensures digital receivers not controlled by the cable operator receive EAS messages?
• In digital channel signal testing, which direction can the tests be performed?
• What does negative polarity modulation indicate about the carrier level?
• What role does the resource manager play in edge QAM (EQAM) systems?
• Which connector port requires a 1.25 mm swab for cleaning on an OTDR?
• What is the function of the call list in fiber-optic restorations?
• Regarding optical power measurement, what is typically included in the input of optical receivers?
• Isolation of a splitter or directional coupler is measured with respect to which port?
• What distinguishes a reflectance measurement from an optical return loss (ORL) measurement?
• What function does an optical power meter serve in testing a fiber-optic plant?
• Which situation would necessitate the use of long loop AGC?
• What is the name of the fiber optic cable that has a connector on both ends?
• What device provides the best isolation of carriers in a headend?
• When testing the receiver portion with an optical power meter, which step is necessary?
• Which topology is primarily used in fiber-to-the-user (FTTx) networks that requires enhanced fiber color code management?
• What is the primary goal of the optical fiber acceptance test?
• What should be done when performing an optical fiber acceptance test?
• What can affect the accuracy of an OTDR measurement?
• Which system imbeds instructions for picture reconstruction when converting HDTV to SDTV?
• Which of the following is a factor that must be prepared for during fiber-optic restoration?
• For a device to operate as a mixer, what characteristic must it have?
• What identifies the frequency of a digital channel?
• Full-feature optical time domain reflectometers (OTDR) have which of the following options?
• What is installed on the output of a QAM modulator to prevent intersymbol interference?
• What are mainframe optical time domain reflectometers (OTDR) primarily used for?
• How should documentation be handled when changes are made to a fiber-optic network?
• What is an advantage of having slack fiber-optic cable available during restoration?
• Which of the following is a basic building block of fiber-optic systems?
• What is the focus of the fiber-optic restoration process?
• What happens when a patch cable is removed from a full-normal patch panel jack?
• How can an OTDR operator compare a new fiber trace with an old one?
• What is the protocol used to transport signals in the headend called?
• Which protocols are used for measuring audience viewership?
• What should be included when choosing the appropriate optical measurement for post-installation fiber-optic span tests?
• What is a correct safety measure in fiber restoration work?
• Which of the following statements is true regarding fiber optic connectors?
• What does optical return loss (ORL) define?
• What does the restoration plan dictate in a flow chart of activities?
• Which of the following statements reflects a principle of effective fiber-optic restoration?
• What compensating feature must a DTV-to-analog decoder adjust apart from program loudness adjustments and DRC?
• Optical time domain reflectometer (OTDR) displays and controls encompass which of the following?
• Why might some carrier frequencies be slightly offset?
• What type of amplifier is crucial for managing signal clipping issues?
• What is the change in data rate when transcoding HDTV to SDTV MPEG-2?
• What is the purpose of modulation within a headend?
• Which best describes the modulation process?
• What is the best practice for ensuring the integrity of outside fiber-optic splice enclosures?
• Which location in fiber-optic facilities is prone to failures?
• What is the third type of ancillary data prevalent in digital television (DTV) transmissions?
• Why was active format description (AFD) developed by SMPTE?
• What is an example of a useful question in a restoration planning questionnaire?
• How can an Emergency Alert System be integrated into a processor?
• Which device populates the encryption control field on programs for encryption in a conditional access system?
• Who is tasked with confirming the best setup locations for equipment in emergency repairs?
• What must an analog television receiver do to ensure content advisory data functions after decoding?
• In a system providing video-on-demand services, what determines the data input to the QAM modulator?
• What is typically the result of not managing digital upconverter input levels correctly?
• What data rate does the original serial data interface (SDI) standard for standard definition TV (SDTV) support?
• What happens when a laser light source is used to test fibers?
• What aspect of restoration is important to address to minimize outage duration?
• Which setting is often adjusted to ensure accurate distance measurements on an OTDR?
• In a temporary fiber-optic restoration, what is crucial for the restoration kit?
• How is the video signal modulated compared to the audio signal?
• What could contribute to unnecessary delays during fiber-optic restoration?
• Which of the following components connect the transmitter and receiver in a fiber-optic system?
• Which statement accurately describes the troubleshooting process for fiber-optic networks?
• Which wavelength is most sensitive to macrobends and microbends in fiber optics?