BDS02

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Rio Salado Community College *

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4

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Electrical Engineering

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Feb 20, 2024

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BDS02   1. If a 3.2MHz upstream channel is using 16 QAM at a symbol rate of 2.560 millions of symbols per second (MS/s), what is the amount of bandwidth available in Mbps?      a.  10.24  b.  5.12  c.  20.48  d.  8.192   view QuestionExp show TheAnsw e 2. Which of the following is a disadvantage of using hubs within an architecture?        a.  increased power requirements  b.  increased performance in the network  c.  decreased fiber requirements  d.  reuse of the frequency spectrum   view QuestionExp show TheAnsw e 3. What is the symbol rate of 256 QAM?      a.  5.36 MS/s @ 6MHz and 6.95 MS/s @ 8MHz  b.  2.56 MS/s @ 6MHz and 5.12 MS/s @ 8MHz  c.  3.84 MS/s @ 6MHz and 5.36 MS/s @ 8MHz  d.  1.28 MS/s @ 1.6MHz and  2.56 MS/s @ 3.2 MHz   view QuestionExp show TheAnsw e 4. Match the following two-way cable configurations.       Column A Your Answer   Column B   1.  Sub-Split 39210 39210,39211,392  =   b   39217,39214,392 a. 900 to 1050 MHz D   2.  Mid-Split 39211 39210,39211,392  =   c   39217,39214,392 b. 5 to 42 MHz DOCSIS (D) / 5 to 65 MHz EuroDOCSIS (ED)   3.  High-split 39212 39210,39211,392  =   d   39217,39214,392 c. 5 to 85 MHz D   4.  Top-split 39213  =   a   d. 5 to 200 MHz D
39210,39211,392 39217,39214,392   view QuestionExp show TheAnsw e 5. ** CORRECTED ** An HFC network is typically designed with:      a.  additional actives and passives as compared to a tree and branch system.  b.  higher gain amplifiers than compared to a tree and branch system architecture.  c.  a goal of producing a similar amount of distortions and noise as compared to a coax only architecture.  d.  power supply design based on a per fiber mile / kilometer basis.   view QuestionExp show TheAnsw e 6. Repeaters (amplifiers) are used in an optical system for:        a.  Signal loss compensation  b.  Reducing node size or homes passed (HP)  c.  Noise reduction  d.  Improving distortion levels   view QuestionExp show TheAnsw e 7. Name the architecture that places numerous fiber optic cable runs deeper into the HFC to optical node areas that are very small, and serve fewer number of homes passed (HP).      a.  RFoG  b.  Active Network  c.  GPON / RF Overlay  d.  Fiber deep   view QuestionExp show TheAnsw e 8. In a classic tree and branch architecture, the distribution plant includes ___________.      a.  Trunk and feeder cables  b.  Nodes  c.  Optical amplifiers  d.  Optical couplers and splitters   Show Explanation
view QuestionExp show TheAnsw e 9. True or False: Replacing the trunk cascade with an optical fiber link can significantly improve network reliability.     True False   view QuestionExp show TheAnsw e 10 . True or False: The number of amplifiers after the node is limited to the amount of distortion and noise they produce.     True False   view QuestionExp show TheAnsw e 11 . Which return / forward split offers the most amount of upstream bandwidth?      a.  sub  b.  mid  c.  high  d.  super   view QuestionExp show TheAnsw e 12 . In an HFC network, fiber replaces which portion of the tree and branch system architecture?      a.  coaxial distribution  b.  line extenders  c.  power supplies  d.  coaxial trunk   view QuestionExp show TheAnsw e 13 . The reliability of an HFC architecture increases ___. (Choose 2)       a.    As hard-line coax length increases    b.    As the number of active devices decreases    c.    As the number of customers decreases    d.    As the node size increases   view QuestionExp show TheAnsw e 14 . In an architecture where fiber replaces the coax and amplifiers, producing a node + 0 architecture, coax is retained in the "last mile
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(meter)."  What is the name of the architecture?      a.  Coax to the Curb  b.  Fiber to the Home  c.  Trunk and Feeder  d.  Radio Frequency over Glass   view QuestionExp show TheAnsw e 15 . An architecture in which a common signal source is distributed to many municipalities is referred to as:      a.  Multiplexing  b.  De multiplexing  c.  Point to Point  d.  Point to Multi-point   view QuestionExp show TheAnsw e 16 . What is the term that describes a series of amplifiers, where one amplifier feeds the next which feeds the next, etc.?   cascade 39240   view QuestionExp show TheAnsw e 17 . What is the total loss of a 400 meter piece of coaxial cable that has a loss of 4.1dB per 100 meters at 865 MHz?  Enter the answer in a single decimal place below.       16.4 219176 Complete the module quiz to assess your knowledge. The quiz is open book so you can use your course materials, references and the Internet but you should not consult other individuals. A passing score is 70%. If you do not pass the quiz you can review the course materials and retake the quiz.  
        BDS03   1. What is the bandwidth occupied by a North America downstream equivalent NTSC or DOCSIS digital signal? (in MHz)   6 39295   view QuestionExp show TheAnsw e 2. What is the function of a thermal coupler or thermal plug?      a.  To correct excessive excursions from channel to channel.  b.  To compensate for levels caused by changes in temperature.  c.  To amplify return signals.  d.  None of the above.   view QuestionExp show TheAnsw e 3. True or False: Since higher frequencies have a higher attenuation factor than lower frequencies, a negative RF slope is required.     True False   view QuestionExp show TheAnsw e 4. ** CORRECTED ** Standard cable spacing is established during cable system design for the spans between amplifiers. What determines this spacing? (Choose 2)       a.    voltage required by the amplifier    b.    signature of the amplifier (characteristics)    c.    attenuation properties of the coaxial cable    d.    location of the hub site    e.    availability of commercial power   view QuestionExp show TheAnsw e 5. Before the first stage of amplification, what is the plug-in used to attenuate the RF signal's lower frequencies greater the higher frequencies at the same RF level? (Hint: not flat loss)      a.  equalizers
 b.  pads  c.  attenuators  d.  shunts  e.  feedermakers   view QuestionExp show TheAnsw e 6. True or False: Frequency response is the plot of the loss or gain of a system across its operating frequency range.     True False   view QuestionExp show TheAnsw e 7. Which method is NOT used to direct power on an amplifier?      a.  fuse  b.  shunt  c.  switch  d.  potentiometer   view QuestionExp show TheAnsw e 8. The DC power supply of the amplifier converts the AC quasi-square wave to DC power. What is the AC voltage converted?      a.  24 or 27 volts  b.  60 or 90 volts  c.  110 or 120 volts  d.  48 volts   view QuestionExp show TheAnsw e 9. What is the typical power gain in dB for an HFC return amplifier?      a.  18 to 20 dB  b.  5 to 10 dB  c.  -8 to 8 dB  d.  0 dB   view QuestionExp show TheAnsw e 10 . What is the device that separates the forward band pass and return band pass from each other (and recombines) so they can be routed to the appropriate
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components within the amplifier station?      a.  diplex filter  b.  directional coupler  c.  line extender  d.  automatic gain control  e.  thermal plug-in   view QuestionExp show TheAnsw e 11 . Name the most efficient amplifier to amplify an input signal to high signal outputs with multiple legs.        a.  Mainstation  b.  Node  c.  trunk w/bridger  d.  Line Extender  e.  trunk   view QuestionExp show TheAnsw e 12 . Name the device that adjusts the tilt of the return amplifier, used in lieu of plug- in equalizers.      a.  gain control potentiometer  b.  pads or attenuators potentiometer  c.  input injection potentiometer  d.  slope control potentiometer   view QuestionExp show TheAnsw e 13 . A ferroresonant transformer steps 120vAC down to 60vAC or 90vAC. What type of waveform is produced?      a.  quasi- square  b.  sine  c.  square  d.  triangular   view QuestionExp show TheAnsw e 14 Match the following HFC active devices.
.       Column A Your Answer   Column B   1.  Converts optical or light energy from the headend (or hub location) to an electrical RF form in the forward path. 21801 21801,21803,218  =   c   21804,2 a. Mainstation or trunk amplifier   2.  Restores signal loss of the electrical energy coming from the headend and produces the highest amount of noise with low distortion. 21803 21801,21803,218  =   a   21804,2 b. Line Extender or distribution amplifer   3.  Restores loss RF signal levels and produces the highest amount of gain compared to the other amplifier mentioned. 21805 21801,21803,218  =   d   21804,2 c. Node   4.  Part of the HFC distribution system that restore loss RF signal levels during travel from the headend, produce the highest amount of distortions. 21807 21801,21803,218  =   b   21804,2 d. Bridger amplifier   view QuestionExp show TheAnsw e 15 . Name a device used to correct irregularities such as peaks or valleys (peak to trough) caused by resonance in cable spans, connectors and passives.      a.  response EQ  b.  interstage  c.  plug-in pad  d.  gain control potentiometer   view QuestionExp show TheAnsw e 16 . Name the device used to establish the band split of the amplifier. (Hint: two words.)   diplex filter 39302   view QuestionExp show TheAnsw e 17 . Name a flat loss plug-in used to ensure the RF input levels to the preamplifier hybrid (gain stage) is equal at all identical amplifiers (unity gain) regardless of amplifier spacing.      a.  pad or attenuator  b.  equalizer  c.  power diplex  d.  trim device  
view QuestionExp show TheAnsw e 18 . What type of amplifier amplifies and passes signals from the headend to the customer? (Hint: closest to the customer)      a.  trunk amplifier  b.  distribution amplifier  c.  bridger amplifier  d.  hub amplifier   view QuestionExp show TheAnsw e 19 . ** CORRECTED ** What is the device that transfers heat from an amplifier's components to the amplifier's housing?     fins heat sink 39343   view QuestionExp show TheAnsw e 20 . ** CORRECTED ** Name the amplifier component used to provide an effective RF shield from ingress.     rf gasket housing 21813   view QuestionExp show TheAnsw e 21 . What is the semiconductor that produces an electrical output signal in response to an optical input signal?      a.  dark current  b.  photodiode  c.  resistor  d.  diplex filter   view QuestionExp show TheAnsw e 22 . What is the device used to route current in an amplifier?        a.  shunt
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 b.  pad  c.  EQ  d.  diplex filter  e.  AGC   view QuestionExp show TheAnsw e 23 . Name the device that separates or combines AC power and the RF broadband signals.      a.  power diplex  b.  diplex filter  c.  power supply  d.  a trim device  e.  response EQ   view QuestionExp show TheAnsw e 24 . True or False: In amplifiers without ALSC or AGC, a temperature monitoring circuit is used to account for the changing attenuation of the cable during weather changes.     True False   view QuestionExp show TheAnsw e 25 . The automatic level and slope control (ALSC) circuit maintains the proper tilt and output level despite changes in the input signals. What is common practice for tilt by operators for setting the upper frequencies vs. the lower frequencies?      a.  3 dB  b.  6 - 12 dB  c.  25 - 28 dB  d.  2 - 4 dB   view QuestionExp show TheAnsw e 26 . In the EuroDOCSIS/European return path spectrum, what band would a sub-split diplex filter produce?        a.  5 to 65 MHz  b.  5 to 42 MHz
 c.  5 to 88 MHz  d.  5 to 108 MHz   Show Explanation view QuestionExp show TheAnsw e 27 . Name an integrated or plug-in module used to amplify the DOCSIS 5 to 42MHz or EuroDOCSIS 5 to 65 MHz spectrum.      a.  return amplifier  b.  forward amplifier  c.  trunk amplifier  d.  line extender   view QuestionExp show TheAnsw e 28 . Name a passive uneven or unbalanced RF splitting device, with low loss from input to output port (insertion loss).      a.  diplex filter  b.  optical splitter  c.  line extender  d.  node  e.  directional coupler   view QuestionExp show TheAnsw e 29 . Name the device used to maintain constant output levels when the coaxial cable loss changes due to temperature changes.      a.  Thermal attenuators  b.  Diplex Filter  c.  Automatic Gain / Slope Control  d.  DC Power Supply   view QuestionExp show TheAnsw e 30 . Name the most efficient trunk amplifier in terms of low distortions used to amplify the cable signal.        a.  Mainstation  b.  Node
 c.  Distribution Amplifier  d.  Line Extender  e.  None of these   Show Explanation view QuestionExp show TheAnsw e   BDS04   1. A directional coupler 9 (DC-9) with an input of 15dBmV has a tap port output of ___ dBmV.   6 21946   view QuestionExp show TheAnsw e 2. What is the name of the isolation between the tap plate ports, designed to prevent interfering RF signals from neighboring customer signals to move between ports?      a.  port to port isolation  b.  input to output isolation  c.  port termination  d.  tap loss   view QuestionExp show TheAnsw e 3. Active devices such as amplifiers in an HFC contain devices to:      a.  detect concentricity in the cable  b.  convert analog "NTSC/PAL" signals to digital "ATSC/DVB"  c.  separate an AC signal from an RF signal  d.  measure bending radius of the coax cable a specific intervals   view QuestionExp show TheAnsw e 4. True or False: Feed-through and addressable are two types of directional taps used in one type of HFC architecture.     True False   view QuestionExp show TheAnsw e 5. Which of the following taps are available as self-terminating (no output port)? (Choose 2)
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       a.    4    b.    8    c.    11    d.    17    e.    23   view QuestionExp show TheAnsw e 6. What is the primary difference between a splitter and a directional coupler?      a.  A typical splitter divides input power into one equal outputs while a directional coupler divides input power into two unequal outputs.  b.  A typical splitter divides input power into two unequal outputs while a directional coupler divides input power into two equal outputs.  c.  A typical splitter divides input power into two equal outputs while a directional coupler divides output power into two unequal inputs.  d.  A typical splitter divides input power into two equal outputs while a directional coupler divides input power into two unequal outputs.   view QuestionExp show TheAnsw e 7. The RF signal level at the input to a tap plate is 30dBmV. You measure 15dBmV at the tap port of a tap plate. What is the dB loss value of this tap plate?      a.  17  b.  47  c.  32  d.  15  e.  2   view QuestionExp show TheAnsw e 8. This device facilitates adding AC power from a line power supply (LPS) onto coax cable while also allowing RF signals to pass along the same cable.      a.  power diplex  b.  power supply  c.  power inserter  d.  directional coupler  e.  addressable tap   view QuestionExp show TheAnsw e 9. Match the following characteristics common to many passive devices:       Column A Your Answer   Column B
  1.  Excess Loss 21924 21924,21  =   b   21929,21 a. Compares the tap port signal level to the input port signal level in units of dB.   2.  Insertion Loss 21926 21924,21  =   d   21929,21 b. Power consumed in the circuit.  The difference between the input power and the total output power.   3.  Tap Value 21928 21924,21  =   a   21929,21 c. The ratio expressed in dB between the signal entering a port and the signal reflecting from that port.   4.  Return loss 21930 21924,21  =   c   21929,21 d. Power loss in dB between the input port and the output port caused by power coupled to tap port and power consumed in the circuit.   view QuestionExp show TheAnsw e 10 . True or False: If a return loss value is relatively high, then the reflected signal is relatively low.     True False   view QuestionExp show TheAnsw e 11 . What is the unit of measure for specifying changes in signal level characteristics through passive devices?   decibel 21912   view QuestionExp show TheAnsw e 12 . ** CORRECTED ** Directional couplers and splitters route RF signals based on the principle of:      a.  induction  b.  capacitance  c.  impedance  d.  current flow   view QuestionExp show TheAnsw e 13 . Identify the correct notation for decibel-millivolt that is referenced to 1mV.      a.  dBm
 b.  dB  c.  dBmV  d.  decMV   view QuestionExp show TheAnsw e 14 . Levels attenuate by about ____ dB at each split of a tap plate or splitter bank.   3.5 39359   view QuestionExp show TheAnsw e 15 . Name a gasket that is designed to prevent RF signals from entering (ingress) or leaving (egress) a closed housing such as a power insert or amplifier.      a.  ingress  b.  RF integrity  c.  egress  d.  housing   view QuestionExp show TheAnsw e 16 . True or False: A power-passing tap plate passes AC power to the tap ports whereas a tap with a power bypass bar passes RF signal and AC power to the output port even if the faceplate is removed.     True False   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   Complete the module quiz to assess your knowledge. The quiz is open book so you can use your course materials, references and the Internet but you should not consult other individuals. A passing score is 70%. If you do not pass the quiz you can review the course materials and retake the quiz.           BDS05  
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1 . Match the following system maps.       Column A Your Answer   Column B   1.  strand 22012 22012,  =   c   22015,22 a. maps of the system as the designer has engineered it. They are the blueprints for constructing the plant.   2.  design 22014 22012,  =   a   22015,22 b. maps of the completed and current system plant, showing any changes or revisions that were made during construction and ongoing operation showing pole, amplifier and tap locations.   3.  as-built 22016 22012,  =   b   22015,22 c. maps of the aerial and underground routing of the various cables throughout the system, showing poles, strand location, trench routes, footages, and other data as needed   view QuestionExp show TheAnsw e 2 . What C/N ratio would you expect at the end of a cascade of 4 identical amplifiers if the first amplifier has a C/N ratio of 59 dB? Assume that the cascade is fed directly from a hub.      a.  53  b.  47  c.  44  d.  41   Show Explanation view QuestionExp show TheAnsw e 3 . What design map symbol is shown?      a.  Optical Node  b.  Line Extender  c.  Power Supply  d.  Headend transmitter   view QuestionExp show TheAnsw e 4 A chart used to display various information about a node, amplifier or a
. line extender at the time it was deployed in the HFC is called a:   tombstone 39409   view QuestionExp show TheAnsw e 5 . ** CORRECTED ** Name a cable design philosophy for amplifier spacing in the forward and return path, where the total loss of the amount of coax cable and passive device loss in the network before an amplifier will equal the gain of the amplifier.      a.  unity gain  b.  amplifier gain  c.  frequency gain  d.  loss / gain design   view QuestionExp show TheAnsw e 6 . Strand maps show: (Choose 3)        a.    strand locations    b.    trench routes    c.    tap locations    d.    streets   view QuestionExp show TheAnsw e 7 . Name a modulation scheme typically used in the forward path or downstream.      a.  64 QAM  b.  256 QAM  c.  QPSK  d.  16 QAM   view QuestionExp show TheAnsw e 8 . True or False: The noise figure (F) is the degradation of the S/N or C/N ratio and the amount of noise that an amplifier will contribute to total system S/N or C/N ratio as the signal passes through the HFC.     True False  
view QuestionExp show TheAnsw e 9 . True or False: Any change in the amplifier noise contribution will introduce a change in intermodulation distortions.     True False   Show Explanation view QuestionExp show TheAnsw e 1 0 . What design map symbol is shown in the diagram?      a.  2 way directional tap plate  b.  4 way directional tap plate  c.  8 way directional tap plate  d.  directional coupler   view QuestionExp show TheAnsw e 1 1 . How is the RF signal level at the input of all distribution amplifiers decided? (Choose 1)         a.    same as the trunk    b.    established by the system design    c.    same as bridger amplifier    d.    determined by node cascade   view QuestionExp show TheAnsw e 1 2 . If the number of identical amplifiers in a cascade is increased from 2 to 4 amplifiers, and the original 2 amplifiers produced a total C/N ratio of 51 dB, what would the total C/N ratio be at the end of the 4 amplifier cascade?      a.  49 dB
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 b.  47 dB  c.  48 dB  d.  45 dB   Show Explanation view QuestionExp show TheAnsw e 1 3 . ** CORRECTED ** Units of dBm are decibels relative to ___ mW of power; hence 0 dBm equals ___ mW of power.   1, 1 1 39413   view QuestionExp show TheAnsw e 1 4 . True or False: Consistent headend upstream or return levels are required regardless of the location of the source upstream or return signal.     True False   view QuestionExp show TheAnsw e 1 5 . According to the diagram, what is the output of the amplifier in dBmV?     21 39403   Show Explanation view QuestionExp show TheAnsw e 1 6 . An amplifier's measured output is worse than the designed output. How should you begin troubleshooting?
     a.  increase the transmit output of the hub LASER  b.  increase the gain of the amplifier  c.  check the input levels to the amplifier  d.  adjust the slope of the amplifier  e.  reduce the padding of the amplifier's output   view QuestionExp show TheAnsw e 1 7 . Each time the number of like amplifiers with similar input levels (pad, EQ, power) is doubled, the carrier to noise (C/N) gets ___ dB worse, 10 log (x).      a.  3.01  b.  1  c.  6.02  d.  2   Show Explanation view QuestionExp show TheAnsw e 1 8 . What is the C/N ratio at the output of a single amplifier with a noise figure (F) of 9 dB and an input power level of 12 dBmV? Assume termination noise of minus 59.2 dB.   62.2 39416   Show Explanation view QuestionExp show TheAnsw e 1 9 . Systems maps provide signal flow and are an important troubleshooting tool, so it is important to keep all maps: (Choose 1)        a.    up-to-date to avoid misinformation    b.    stored in the supervisor office    c.    only used by back office engineering    d.    changed as often as possible   view QuestionExp show TheAnsw e 2 0 . The C/N changes ___ dB for every 1 dB change in output power levels.   1
22026   view QuestionExp show TheAnsw e 2 1 . ** CORRECTED ** The C/N improves from every 1 dB that is added to the input of the amplifier above the noise figure (F); however, the CTB and XMOD get worse by ___ dB.   1 2 39406   view QuestionExp show TheAnsw e 2 2 . The difference between the RF carrier and average level of the noise floor is called:      a.  signal to valley  b.  modulation error ratio  c.  bit error rate  d.  carrier to noise   view QuestionExp show TheAnsw e 2 3 . According to the diagram, what is the dB gain of amplifiers 1, 2 and 3?       14.5 39400   Show Explanation view QuestionExp show TheAnsw e 2 4 . The difference between the most positive signal amplitude and the most negative signal amplitude levels of an electrical signal such as RF is called:      a.  peak to valley  b.  carrier to noise
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 c.  signal to noise  d.  wave to floor   Show Explanation view QuestionExp show TheAnsw e 2 5 . If the 256 QAM symbol rate is 5.36 millions of symbols per second (MS/s), what is the data rate in Mbps?      a.  42.88  b.  32.16  c.  21.44  d.  37.52   Show Explanation view QuestionExp show TheAnsw e 2 6 . An amplifier tombstone or data block on an RF design map includes which of the following information? (Choose 3)        a.    Amplifier Cascade    b.    Footage to Previous Amplifier    c.    Forward Equalizer    d.    DC voltage    e.    Reverse Diplex Filter   view QuestionExp show TheAnsw e   BDS Module 06 - Electrical Characteristics of Cable taken by Robert Benzakein    (view test intro) Complete the module quiz to assess your knowledge. The quiz is open book so you can use your course materials, references and the Internet but you should not consult other individuals. A passing score is 70%. If you do not pass the quiz you can review the course materials and retake the quiz.           BDS06   1. What is the ohm's law formula for resistance?
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     a.  R = E (V) / I  b.  R = I / E (V)  c.  R = I x E (V)  d.  R = P / I   view QuestionExp show TheAnsw e 2. Using ohm's law, calculate the current in a circuit where the voltage is 24 v and the resistance is 10 k ohms:      a.  4.2 mA  b.  2.4 A  c.  2.4 mA  d.  1-A   view QuestionExp show TheAnsw e 3. The creation of an electric charge or a magnetic field in material such as cable is called:   induction 39474   view QuestionExp show TheAnsw e 4. True or False: Capacitance blocks DC current, allowing AC current to pass.     True False   view QuestionExp show TheAnsw e 5. True or False: Coax cable kinks creates an impedance mismatch, the impedance of the source and load not matching, which may cause excess return loss or reflected RF signals.     True False   view QuestionExp show TheAnsw e 6. What are the effects of capacitance on a cable system? (Choose 3)        a.    suck out    b.    roll off    c.    allows DC current to pass    d.    ability to store electrical charge  
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view QuestionExp show TheAnsw e 7. Resistance is measured in:      a.  farads  b.  amperes  c.  voltage  d.  ohms   view QuestionExp show TheAnsw e 8. Which electrical quantities determine the impedance (Z) of a circuit: (Choose all that apply)        a.    resistance (R)    b.    capacitance (C)    c.    inductance (L)    d.    frequency (f)   view QuestionExp show TheAnsw e 9. Calculate the amount of voltage on a piece of coax cable with 0.8 amperes (I) of current.      a.  10.67 mV  b.  60 v  c.  93.75 v  d.  none of these   view QuestionExp show TheAnsw e 10 . True or False: An inductor is a coil wound wire in different diameters and coil sizes that allows AC to pass, but resists DC.     True False   view QuestionExp show TheAnsw e 11 . A function of the distance between the center conductor and the outer shield of a coaxial cable is referred to as:      a.  capacitance  b.  inductance  c.  impedance  d.  velocity of propagation   Show Explanation
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view QuestionExp show TheAnsw e 12 . The difference between dB and dBmV is:      a.  dB is a ratio with no specific unit of measure while dBmV is a specific signal level.  b.  dB is a measure of wattage while dBmV is a measure of voltage.  c.  dB refers to input and output signal levels while dBmV is a measure of internal signal- power consumption.  d.  None of the above.   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS07   1. Using ohm's law, calculate the current in a circuit where the voltage is 26v and the resistance is 2 ohm:      a.  0.08 A  b.  26 A  c.  13 A  d.  52 A   view QuestionExp show TheAnsw e 2. Using Joule's Law, calculate the power dissipated in a circuit with a voltage of 24v, resistance of 10K and current of 2.4 mA.      a.  56.7 mW  b.  5.76 mW  c.  57.6 mW  d.  65.7 mW   Show Explanation view QuestionExp show TheAnsw e 3. Which formula is INCORRECT?      a.  R = E / I  b.  E = R x I  c.  I = P x E  d.  E = P / I  
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view QuestionExp show TheAnsw e 4. The difference between dB and dBmV is:      a.  dB is a ratio with no specific unit of measure while dBmV is a specific signal level.  b.  dB is a measure of wattage while dBmV is a measure of voltage.  c.  dB refers to input and output signal levels while dBmV is a measure of internal signal- power consumption.  d.  None of the above.   view QuestionExp show TheAnsw e 5. 0 dBmV equals:      a.  1 millivolt peak measured across 75 ohms  b.  1 millivolt RMS measured across 75 ohms  c.  1 microvolt RMS measured across 75 ohms  d.  1 microvolt peak measured across 75 ohms   view QuestionExp show TheAnsw e 6. Using the decibel formula, calculate the dB ratio (gain) of an amplifier with an input that equals 6 watts and an output that equals 12 watts.      a.  3.01  b.  0.28  c.  -3.01  d.  0.68   view QuestionExp show TheAnsw e 7. In the positional number system, the value of a digit in a number is determined by the power of ___.   ten 22142   view QuestionExp show TheAnsw e 8. We use logarithms when comparing RF levels in a cable network because:      a.  The RF levels are extremely close in magnitude.  b.  The RF levels are vastly different in magnitude.  c.  There is a wide band of frequencies involved.  d.  The FCC requires it.
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  view QuestionExp show TheAnsw e 9. 75 ohms is the characteristic impedance of coaxial cable used in cable networks. 1 mV signal across this impedance is equal to:      a.  1 bel  b.  3.01 dB  c.  0 dBmV  d.  10 mW   view QuestionExp show TheAnsw e 10 . What is the maximum distance of QR860 cable that can be used with a 25dB gain amplifier? QR860 has a cable loss 1.24dB/100' at 750 MHz. (Hint: Provide whole number as answer, no decimal places please.)     2016 39507   Show Explanation view QuestionExp show TheAnsw e 11 . An amplifier has an input signal of 0.3 milliwatts (mW) and produces an output of 1 milliwatts (mW). What is the dB gain? (use 2 decimal places)   5.23 22149   view QuestionExp show TheAnsw e 12 . What does an increase of 3 dB indicate?      a.  Doubling of power  b.  Halving of power  c.  A doubling or a halving of the power depending upon the direction of the change  d.  Change of the network's characteristic impedance   view QuestionExp show TheAnsw e 13 . True or False: An RF amplifier with 3.01 dB of gain will produce an output of 3 watts if its input is 1.5 watts.     True False   view QuestionExp show TheAnsw e  
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  I'm Done Reviewing Answers   Coaxial Cable taken by Robert Benzakein    (view test intro) Complete the module quiz to assess your knowledge. The quiz is open book so you can use your course materials, references and the Internet but you should not consult other individuals. A passing score is 70%. If you do not pass the quiz you can review the course materials and retake the quiz.           BDS08   1. SRL refers to the      a.  impedance variations of coax cable  b.  impedance variations of amplifiers  c.  impedance variations of connectors  d.  DC loop resistance   view QuestionExp show TheAnsw e 2. A section of coaxial cable is 75 feet long feeding a 4-way splitter at the customer location. Assume that the coaxial cable has an attenuation of 1.8 dB per hundred feet at 200 MHz. What would be the approximate dB attenuation at the splitter's output port at 200 MHz?      a.  1.35  b.  8.35  c.  4.85  d.  11.85   view QuestionExp show TheAnsw e 3. Reflections are caused by:      a.  improper connector terminations in the HFC resulting in an impedance mismatch  b.  the varying temperature of the environment  c.  manufactures using different types of coax dielectric material  d.  the losses at high and low frequencies   view QuestionExp show TheAnsw e
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4. Name the transfer of signal power from the point of input (source) to the point of output (load). (Hint: two words, lowercase)   pow er transfer 39519   view QuestionExp show TheAnsw e 5. True or False: Jacket bonding onto hardline coaxial cable does not increase RF shielding.     True False   view QuestionExp show TheAnsw e 6. ___ ___ ___ is used to describe the ratio of input power to reflected power and is expressed in decibels (dB). (Hint: three words)   structural return loss 39524   view QuestionExp show TheAnsw e 7. True or False: HELIAX air has greater attenuation than coax foam.     True False   view QuestionExp show TheAnsw e 8. A section of coaxial cable is 200 feet long feeding an 8-way splitter at the customer location. Assume that the coaxial cable has an attenuation of 5.5 dB per hundred feet at 752 MHz. What would be the approximate dB attenuation at the splitter's output port at 752 MHz?      a.  11  b.  22  c.  18  d.  14   view QuestionExp show TheAnsw e 9. What happens when water soaks into the cable's dielectric?      a.  all frequencies attenuation more  b.  high frequencies attenuation more  c.  low frequencies attenuation more  d.  AC frequencies attenuation more  
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view QuestionExp show TheAnsw e 10 . name the device that protects and prevents EMI (electromagnetic interference) and RFI (radio frequency interference) in a coax cable circuit.   shield 39521   view QuestionExp show TheAnsw e 11 . True or False: Coaxial cable attenuation has a flat loss across all frequencies.     True False   view QuestionExp show TheAnsw e 12 . True or False: Temporary fiber optic connections that carry AC need to have the same DC loop resistance.     True False   view QuestionExp show TheAnsw e 13 . A guideline for bending radius is ___ times cable diameter.   10 39550   view QuestionExp show TheAnsw e 14 . A break in the coax shield allowing signals to leak out is called:      a.  outgress  b.  ingress  c.  egress  d.  ongress   view QuestionExp show TheAnsw e 15 . Which of the following are components of the coaxial cable which will affect its impedance properties? (Choose 3)        a.    inner diameter of the shield    b.    outer diameter of the center conductor    c.    type of dielectric material    d.    DC loop resistance
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   e.    length of the coax    f.    diameter of the coax   view QuestionExp show TheAnsw e 16 . Mismatch occurs when any point in the RF distribution does not have a characteristic impedance of ___ ?.   75 22195   view QuestionExp show TheAnsw e 17 . A compound that allows small aberrations or cuts on the outside jacket of underground coax to be rendered harmless to the cable.   flooding 22215   view QuestionExp show TheAnsw e 18 . Reflected signals from an impedance mismatch mix with the RF signals to create a phenomenon called:      a.  standing waves  b.  structural return loss  c.  refracted waves  d.  ghosting in digital signals   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers BDS09   1. Refer to the diagram and select the 90 degree adapter.
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     a.  A  b.  B  c.  C  d.  D  e.  E  f.  F  g.  G   view QuestionExp show TheAnsw e 2. Refer to the diagram and select the splice connector.      a.  A
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 b.  B  c.  C  d.  D  e.  E  f.  F  g.  G   view QuestionExp show TheAnsw e 3. True or False: The rounder the cable end is, the harder it is for the coring tool to enter the cable to begin coring.     True False   view QuestionExp show TheAnsw e 4. True or False: A hardline coax connector that uses the center conductor to extend beyond the front of the connector may result in coax damage caused by the set screw.     True False   view QuestionExp show TheAnsw e 5. A jacket removal tool should be used to remove the jacket on a hardline cable and NOT a: (Choose 3)        a.    knife    b.    torch    c.    screw driver    d.    cable prep tool   view QuestionExp show TheAnsw e 6. True or False: An integral sleeve is used in some connectors to minimize RF leakage.     True False   view QuestionExp show TheAnsw e 7. Good hardline coaxial cable cores require at least ___ of straight cable to prevent damage.      a.  6 in or 15 cm  b.  12 in or 30 cm
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 c.  3 in or 8 cm  d.  none of these   view QuestionExp show TheAnsw e 8. True or False: The hardline connector has a center conductor guide on the mid-body to ensure proper length is achieved.     True False   view QuestionExp show TheAnsw e 9. Refer to the diagram and select the feed through connector.      a.  A  b.  B  c.  C  d.  D  e.  E  f.  F  g.  G   view QuestionExp show TheAnsw e 10 . Refer to the diagram and select the housing to housing connector.
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     a.  A  b.  B  c.  C  d.  D  e.  E  f.  F  g.  G   view QuestionExp show TheAnsw e 11 . Refer to the diagram and select the housing terminator connector.      a.  A
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 b.  B  c.  C  d.  D  e.  E  f.  F  g.  G   view QuestionExp show TheAnsw e 12 . Which of the following is used to remove conductor pre-coat? (Choose 2)        a.    knife    b.    glass cutter tool    c.    propane torch    d.    plastic tool    e.    plexi-glass tool   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS10   1. When testing the voltage of a series of batteries, they should be within ___ vDC of each other.   .3 22294   view QuestionExp show TheAnsw e 2. What device is used to insert power onto the coaxial cable for powering amplifiers and nodes?        a.    Line Power Inserter    b.    Line Power Supply    c.    Standby Power Supply    d.    Centralized Power Supply   view QuestionExp show TheAnsw e 3. ** CORRECTED ** Identify the most common type of powering using multiple power supplies to
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energize line power inserters (LPI), designed to feed power in both directions, upstream and downstream, from an insertion point in the HFC.      a.  central  b.  standby  c.  distributed  d.  power grid   view QuestionExp show TheAnsw e 4. This device passively combines RF signals with up to 90 vAC from a line power supply.       a.    LPS    b.    Standby power supply    c.    RFI    d.    Non standby power supply    e.    LPI   view QuestionExp show TheAnsw e 5. Name two disadvantages of a non-standby power supply.              a.    is dependent on the utility company    b.    less expensive than standby power supplies    c.    generators are required for backup powering    d.    does not require batteries   view QuestionExp show TheAnsw e 6. ___ power supplies contain batteries for supplying power output when utility power is interrupted.   standby 22274   view QuestionExp show TheAnsw e 7. Standby power supplies use___ vDC batteries providing 3 hrs of backup.
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  12 39634   view QuestionExp show TheAnsw e 8. Be careful handling the power supply unit. The ferroresonant transformer which provides regulated power output generates a significant amount of ___.   heat 39628   view QuestionExp show TheAnsw e 9. What is shown in the diagram?        a.  central power supply  b.  standby power supply  c.  distributed power supply
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 d.  non standby power supply   view QuestionExp show TheAnsw e 10 . The placement of power insertion depends on the design of the distribution system and type of power supply used. What are the typical voltages used to power an HFC plant?      a.  30 volts or 60 volts  b.  60 volts or 90 volts  c.  90 volts or 120 volts  d.  120 volts or 240 volts   view QuestionExp show TheAnsw e 11 . Which two powering architectures are commonly used in coaxial cable networks? (choose 2)        a.    Distributed    b.    Standby    c.    Centralized    d.    Field Selectable   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS11   1. How many states does the binary numbering system offer?   2 22335   view QuestionExp show TheAnsw e 2. A modulation scheme that varies the frequency of a carrier is called:      a.  Amplitude Modulation  b.  Frequency Modulation  c.  Phase Modulation  d.  Quadrature Amplitude Modulation   view QuestionExp show TheAnsw e 3. The technique of varying the ___ of a carrier based on the characteristics of
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the baseband signal by referencing two carriers.      a.  phase  b.  frequency  c.  time  d.  amplitude   view QuestionExp show TheAnsw e 4. 1011 is equivalent to a decimal ___.     11 39639   view QuestionExp show TheAnsw e 5. This numbering system is the basis for QAM modulation encoding.     binary 39637   view QuestionExp show TheAnsw e 6. Match the following symbol bits.       Column A Your Answer   Column B   1.  QPSK 22325 22325,2  =   d   22328,2233 a. 4 bits / symbol   2.  16 QAM 22327 22325,2  =   a   22328,2233 b. 6 bits / symbol   3.  64 QAM 22329 22325,2  =   b   22328,2233 c. 8 bits / symbol   4.  256 QAM 22331 22325,2  =   c   22328,2233 d. 2 bits / symbol   view QuestionExp show TheAnsw e 7. True or False: BER is defined as the ratio of bits containing errors relative to the number of bits sent and received in a given time interval.     True False
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  view QuestionExp show TheAnsw e 8. A modulation scheme that depends on varying amplitude sidebands is called:      a.  Amplitude Modulation  b.  Frequency Modulation  c.  Phase Modulation  d.  Quadrature Amplitude Modulation  e.  Quadrature Phase Shift Keying   view QuestionExp show TheAnsw e 9. Order the following steps for A/D conversion.       Column A Your Answer   Column B   1.  Sample 22341 22341,2  =   b   22346,2234 a . 3   2.  Quantize 22343 22341,2  =   c   22346,2234 b . 1   3.  Encode 22345 22341,2  =   a   22346,2234 c. 2   view QuestionExp show TheAnsw e 10 . In the QAM signal, there are two carriers, I and Q, within the same frequency but differing in phase by ___ degrees.   90 22359   view QuestionExp show TheAnsw e 11 . True or False: Modulation symbol rate is sometimes called the baud rate.     True False   view QuestionExp show TheAnsw e 12 . Audio and video information are superimposed on an RF carrier by a process called:      a.  multiplexing
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 b.  modulation  c.  compression  d.  combining   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS12   1. True or False: Intermodulation (CSO, CTB, XMoD) from an amplifier is the result of its nonlinear operation.     True False   view QuestionExp show TheAnsw e 2. Express the composite second order beat distortions for the following channels: Carrier A is 55.25 MHz Carrier B is 175.25 MHz (Choose 2)        a.    120 MHz    b.    230.5 MHz    c.    105 MHz    d.    240.5MHz   Show Explanation view QuestionExp show TheAnsw e 3. Identify the units that indicate the power relative to the power of the main carrier frequency.      a.  dBm  b.  dBmV  c.  dB  d.  dBc   view QuestionExp show TheAnsw e 4. Distortion manifests as extra signals called ___.     beats 22388   view QuestionExp show TheAnsw e 5. True or False: Using a spectrum analyzer, cross modulation would be found in the 15.75 kHz (approx.) video sidebands.
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    True False   view QuestionExp show TheAnsw e 6. Match the following distortions.       Column A Your Answer   Column B   1.  The source of CTB. When three signals have mixed in a non-linear device to produce a distorted signal. 22390 22390,22392,223  =   c   22399,22 a. Cross Modulation Distortion   2.  The total effect of all third order products within one channel.   22392 22390,22392,223  =   e   22399,22 b. Composite Second Order   3.  Combining of two frequencies to produce a third frequency. 22394 22390,22392,223  =   d   22399,22 c. Discrete Third Order   4.  The total effect of all DSO products within one channel. 22396 22390,22392,223  =   b   22399,22 d. Discrete Second Order   5.  The transferring of signal information (intelligence) from one carrier to another. 22398 22390,22392,223  =   a   22399,22 e. Composite Triple Beat   view QuestionExp show TheAnsw e 7. Which of the following is a source of noise caused by random motion of electrons?       a.    Radiated noise    b.    Impulse noise    c.    Thermal noise    d.    Optical RF noise   view QuestionExp show TheAnsw e 8. Are intermodulation distortions input or output related?      a.  input  b.  output   view QuestionExp show TheAnsw e 9. If the output of an amplifier is changed by 1 dB the third order distortions change by ___ dBc.        a.  2  b.  1
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 c.  6  d.  3   view QuestionExp show TheAnsw e 10 . For every doubling of an amplifier cascade CTB and XMOD distortions increase by ___ dB in amplitude.   6 22376   Show Explanation view QuestionExp show TheAnsw e 11 . Express the composite triple beat distortion: (Choose 2)        a.    2xF1 - F2    b.    F1+F2    c.    F2-F1    d.    F2-F1+F3   Show Explanation view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS13   1. This component contains the return transmitter, transforming the RF signal into a light signal and transmits it back to the headend.      a.  amplifier  b.  power inserter  c.  node  d.  combiner   view QuestionExp show TheAnsw e 2. What is the most common method of upstream level balancing?      a.  network-wide flat loss or pad adjustment  b.  network-wide thermal noise adjustment  c.  network-wide automatic level control  d.  the use of filters or trap trim devices  
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view QuestionExp show TheAnsw e 3. True or False: Downstream is energy distribution vs. upstream, which is energy accumulation.     True False   view QuestionExp show TheAnsw e 4. The HFC is similar to the coaxial topology except that long trunk runs are replaced by ___ links.   fiber 39710   view QuestionExp show TheAnsw e 5. Impulse noise is caused by: (Choose all that apply)        a.    vehicle ignitions    b.    neon signs    c.    static from lighting    d.    power line switching transients    e.    household appliances    f.    excessive ingress   view QuestionExp show TheAnsw e 6. True or False: CPD does NOT effect the forward path.     True False   view QuestionExp show TheAnsw e 7. Contains the optical receiver which receives the light from the return transmitter.      a.  headend or hub  b.  optical node  c.  amplifier or line extender  d.  tap plate or conditioner  e.  street cabinet   view QuestionExp show TheAnsw e 8. What are the most common causes of common path intermodulation distortion (CPD)? (Choose 2)       a.    skin effect
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   b.    dissimilar metals that become corroded    c.    non terminated amplifier housing ports    d.    LASER clipping -- power levels too high    e.    poorly installed connectors   view QuestionExp show TheAnsw e 9. True or False: Combining MPEG-2 elementary streams (ES) for transmission over the metro or regional network is called an MPEG-2 transport stream (MPEG-TS).     True False   view QuestionExp show TheAnsw e 10 . A non-EuroDOCSIS return path uses a sub-split, which will produce a return path spectrum of:      a.  5 to 42 MHz  b.  5 to 65 MHz  c.  5 to 200 MHz  d.  5 to 238 MHz   view QuestionExp show TheAnsw e 11 . The digital signal frequency designation used by cable operators is:      a.  the upper frequency  b.  the center frequency  c.  the lower frequency   view QuestionExp show TheAnsw e 12 . While cable modems or embedded multimedia terminal adapters use QAM in the return, set top boxes use:      a.  FDMA  b.  QPSK  c.  QAM 64  d.  MPEG-TS  e.  DVB-C  
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view QuestionExp show TheAnsw e 13 . True or False: A consistent receive level is required at the headend regardless of location of the source upstream signals.     True False   Show Correct Answer view QuestionExp show TheAnsw e 14 . The measurement of impedance differences in dB.      a.  CSO  b.  CPD  c.  return loss  d.  CTB  e.  Hum   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers BDS14   1. Analog PAL uses a channel bandwidth of 8 MHz and analog NTSC uses a channel bandwidth of ___ MHz.   6 22418   view QuestionExp show TheAnsw e 2. A nibble is ___ bits.   4 22448   view QuestionExp show TheAnsw e 3. One million Hz is      a.  MHz  b.  KHz  c.  THz  d.  GHz   view QuestionExp show TheAnsw e 4. The number of waves that pass a fixed point per unit of time defines:
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     a.  amplitude  b.  phase  c.  frequency  d.  quadrature amplitude   view QuestionExp show TheAnsw e 5. The color burst signal is ___ MHz away from the NTSC video carrier.   3.58 22420   view QuestionExp show TheAnsw e 6. What is the bandwidth of a signal with an upper frequency limit of 275MHz and lower frequency limit of 267MHz?   8 22424   view QuestionExp show TheAnsw e 7. The audio carrier in an NTSC channel is located _____MHz above the video carrier.   4.5 39735   view QuestionExp show TheAnsw e 8. What is the bandwidth of a PAL TV channel?      a.  8 MHz  b.  6 MHz  c.  3.2 MHz  d.  1.6 MHz   view QuestionExp show TheAnsw e 9. Error correction such as FEC added to a QAM signal is called:      a.  payload  b.  overhead  c.  symbol rate
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 d.  data rate  e.  quality of service or QoS   view QuestionExp show TheAnsw e 10 . Frames are located at the ___ layer of the OSI model.      a.  data-link  b.  session  c.  transport  d.  physical   view QuestionExp show TheAnsw e 11 . What is the bandwidth of a NTSC TV channel?      a.  6 MHz  b.  8 MHz  c.  6.4 MHz  d.  3.2 MHz   view QuestionExp show TheAnsw e 12 . What is the channel bandwidth of a return signal? (Choose 3)        a.    1.6 MHz    b.    3.2 MHz    c.    6.4 MHz    d.    6 MHz    e.    8 MHz   view QuestionExp show TheAnsw e 13 . The FCC (or Ofcom in UK) requires that a minimum level of ___ dBmV be provided on an analog video channel to each subscriber terminal.   0 22496   view QuestionExp show TheAnsw e 14 To provide guide data and other information such as the virtual channel
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. mapping to frequency mapping to set-top boxes, a(n) ____ channel is used.      a.  forward  b.  out of band  c.  return  d.  over the top  e.  narrow cast   view QuestionExp show TheAnsw e 15 . Name a way of multiplexing several groups of carriers at different slots onto a single piece of coaxial cable for transmission in the return path. (Allows cable modems to communicate with the CMTS)      a.  FDM / FDMA  b.  ATDMA / TDMA / SCDMA  c.  WDM / DWDM  d.  CWDM / WDM   view QuestionExp show TheAnsw e 16 . The binary value "1001" is equal to a ___ decimal value.   9 22450   view QuestionExp show TheAnsw e 17 . An octet or byte is ___ bits.   8 22452   view QuestionExp show TheAnsw e 18 . A way of multiplexing several groups of carriers at different frequencies onto a single piece of coaxial cable for transmission in the forward path.      a.  FDMA  b.  ATDMA  c.  TDMA  d.  WDM
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 e.  DWDM  f.  CWDM   view QuestionExp show TheAnsw e 19 . Match the following filters.       Column A Your Answer   Column B   1.  High pass filter 22438 22438,22440,224  =   e   22443,2244 a . block a band of frequencies   2.  Low pass filter 22440 22438,22440,224  =   c   22443,2244 b . low pass filter preventing 1GHz and greater   3.  Band rejection filter 22442 22438,22440,224  =   a   22443,2244 c. all signals below a frequency   4.  Point of Entry (PoE) for MoCA 22444 22438,22440,224  =   b   22443,2244 d . pass a band of frequencies   5.  Band pass filter 22446 22438,22440,224  =   d   22443,2244 e . all signals above a frequency   view QuestionExp show TheAnsw e 20 . Layer 3 of the OSI model is called ___.      a.  data-link  b.  physical  c.  transport  d.  network   view QuestionExp show TheAnsw e 21 . True or False: A digital 6/8 MHz channel is multiplexed, representing a number of MPEG-2 compressed channels where a signal analog NTSC/PAL channel used to be.     True False   view QuestionExp show TheAnsw e
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22 . True or False: The relationship within a channel between amplitude and frequency is referred to as the frequency response.     True False   view QuestionExp show TheAnsw e 23 . An analog signal uses AM for video and this type of modulation for audio.      a.  FM  b.  AM  c.  PM  d.  QAM   view QuestionExp show TheAnsw e 24 . Over the air (OTA) vestigial sideband (VSB) transmission for analog removes ___ information.   sideband 22422   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS15   1. True or False: A line loop tester or brown meter finds faults in the telephone wires of the customer's home.     True False   view QuestionExp show TheAnsw e 2. When using the divide and conquer (or half-split method) troubleshooting method, if the signal level at a tap indicates a signal level below minimum, the next place to check would be:      a.  the input to the ground block or isolator  b.  the output of the amplifier upstream  c.  the output of the node  d.  the output of the headend LASER   view QuestionExp show TheAnsw e 3. When looking at the constellation of a QAM signal, the area in which each point of the constellation falls is called a ___ area.
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  decision 22623   view QuestionExp show TheAnsw e 4. True or False: The proper channel plan and channel type for the cable system is not required to be loaded on the H-DSA or SLM.     True False   view QuestionExp show TheAnsw e 5. Visual display of modulation errors on a QAM signal.      a.  constellation  b.  delta  c.  sine wave  d.  hay stack   view QuestionExp show TheAnsw e 6. The device used in a line power supply to transmit the status data upstream to a network operation center, headend or hub is called:      a.  transponder  b.  time domain reflectometer  c.  cable modem  d.  node   view QuestionExp show TheAnsw e 7. The resistance of a short piece of coax cable will read approximately ___ on an ohm-meter.   infinity 22536   view QuestionExp show TheAnsw e 8. Order the following steps of troubleshooting.       Column A Your Answer   Column B   1.  Analyze the Symptoms 22592 22592,22594,225  =   d   22595,2259 a . 2
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  2.  Isolate the source of the Problem 22594 22592,22594,225  =   a   22595,2259 b . 3   3.  Divide and Conquer 22596 22592,22594,225  =   b   22595,2259 c. 4   4.  Problem Resolution and/or Repair 22598 22592,22594,225  =   c   22595,2259 d . 1   view QuestionExp show TheAnsw e 9. Used to test analog plain old telephone system (POTS) lines. Tests such as making calls, measuring voltage or monitoring the line are conducted on the POTS lines.      a.  butt set  b.  signal level meter  c.  foreign voltage detector  d.  continuity tester   view QuestionExp show TheAnsw e 10 . How often should leakage equipment be calibrated?      a.  daily  b.  weekly  c.  monthly  d.  yearly   view QuestionExp show TheAnsw e 11 . What is going on with the constellation?
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     a.  too much noise, interference, or non-linearity  b.  coherent (discrete) interference  c.  over compression of signals  d.  phase noise   view QuestionExp show TheAnsw e 12 . The two pieces of test equipment most often used to troubleshoot an outage are: (choose 2)        a.    signal level meter    b.    volt ohm meter    c.    time domain reflectometer    d.    TV test set    e.    optical power meter   view QuestionExp show TheAnsw e 13 . True or False: When coax lines are close together, the signal from the locator is induced onto the parallel conductor making accurate location easy.     True False   view QuestionExp show TheAnsw e 14 . True or False: In digital signals, the carrier is suppressed for transmission (as compared to an analog) in the forward path.     True False  
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view QuestionExp show TheAnsw e 15 . A ___ is a device or tool that displays a plot of signal frequency versus signal amplitude, used to verify frequency response.      a.  spectrum analyzer  b.  signal leakage meter  c.  optical power meter  d.  time domain reflectometer  e.  volt ohm meter   view QuestionExp show TheAnsw e 16 . True or False: When no RF is available at a set-top box or cable modem, check levels at the station cabinet or tap plate.     True False   view QuestionExp show TheAnsw e 17 . A VOM or DMM can be used to test phone line:      a.  shorts or opens  b.  wiring mapping and color coding  c.  ringer equivalency number of interior wiring  d.  RF power levels   view QuestionExp show TheAnsw e 18 . True or False: Always check to see that the RF signal levels from the tap port or splitter bank meet system design specifications before attaching connections down stream.     True False   view QuestionExp show TheAnsw e 19 . After connecting the drop to the set-top box, no digital picture appears on the TV. What course of action should be down next?      a.  check RF levels on the drop  b.  verify channel settings on the TV for analog  c.  verify hookup -- component, HDMI, composite, etc...  d.  check the ground block or isolator  
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view QuestionExp show TheAnsw e 20 . What RF levels are commonly considered to be an indication of sufficient analog video level at the RF input of a TV set?      a.  0 to -5 dBmV  b.  0 to +10 dBmV  c.  +11 to +20 dBmV  d.  + 15 to +25 dBmV   view QuestionExp show TheAnsw e 21 . True or False: Channel plans in the SLM should be reloaded when channels are changed at the headend or hub.     True False   view QuestionExp show TheAnsw e 22 . Device used to locate damage, transmission line discontinuities, or impedance mismatches in coaxial cable by using distance and phase is called:      a.  QAM analyzer  b.  signal leakage detector  c.  atmosphere monitor  d.  time domain reflectometer   view QuestionExp show TheAnsw e 23 . True or False: Total system noise at the headend is greater than at any single source found downstream.     True False   view QuestionExp show TheAnsw e 24 . What is the problem associated with the donut constellation?      a.  phase noise  b.  too much noise, interference, or non-linearity  c.  coherent (discrete) interference  d.  carrier compression   view QuestionExp show TheAnsw e 25 True or False: Digital signal level readings are average power measurements.
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.     True False   view QuestionExp show TheAnsw e 26 . In ground based CLI calculations, only those leakage levels of ___ or greater should be considered.      a.  50 or > µV/m at a distance of 10 ft / 3 m  b.  20 or > µV/m at a distance of 10 ft / 3 m  c.  15 or > µV/m at a distance of 100 ft /30.48 m   view QuestionExp show TheAnsw e 27 . The ___ ___ ___ is required to accurately use a TDR or OTDR.      a.  speed of light  b.  velocity of propagation  c.  structural return loss  d.  bit symbol rate   view QuestionExp show TheAnsw e 28 . The type of meter used to test downstream digital signal quality such as BER, MER or constellations, is called:      a.  time domain reflectometer  b.  signal leakage detector  c.  atmosphere monitor  d.  QAM analyzer   view QuestionExp show TheAnsw e 29 . The video carrier is ___ dB higher than an audio carrier in an analog signal.   15 39785   view QuestionExp show TheAnsw e 30 . A customer's installation is not working correctly. Where should the first RF reading be taken?      a.  at the street cabinet or tap plate
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 b.  at the wall plate  c.  at the last amplifier  d.  at the ground block or isolator   view QuestionExp show TheAnsw e 31 . The tool used to identify specific wires of twisted pair or station wire and their route at the location is called:      a.  continuity tester  b.  volt power meter  c.  reference cable modem  d.  toner and probe (trace)   view QuestionExp show TheAnsw e 32 . When using a VOM on a feeder/distribution coax, the amount of resistance measured in ohms across the center conductor and outer metal shield when a short circuit is present will likely be:      a.  close to zero  b.  infinte  c.  a high rating  d.  not relevant to shorts   view QuestionExp show TheAnsw e 33 . What is going on with the constellation?
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     a.  too much noise, interference, or non-linearity  b.  coherent (discrete) interference  c.  over compression of signals  d.  phase noise   view QuestionExp show TheAnsw e 34 . The picture on all TVs at the customer premises fluctuates from good to bad. Which item could be the cause?      a.  series 59 wire  b.  house amplifier plugged into an outlet on a wall switch  c.  customer TVs are defective  d.  splitter hit by lightening   view QuestionExp show TheAnsw e 35 . When using a handheld digital signal analyzer (H-DSA) or signal level meter (SLM) the difference between an analog's video and audio carrier levels are expressed as a ratio of dB called the:      a.  delta
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 b.  power  c.  sum  d.  difference   view QuestionExp show TheAnsw e 36 . Twisted pair wire bundles require a ___ for wire identification.      a.  wire mapper  b.  butt set  c.  VOM  d.  coax toner   view QuestionExp show TheAnsw e 37 . You are on an outage and find an amplifier with good RF input, no RF output, and no AC voltage. You should:      a.  replace the DC power pack  b.  check the design maps for powering configuration  c.  check to make sure that commercial power is available  d.  replace the line power inserter   view QuestionExp show TheAnsw e 38 . A signal leakage reading of 5 uV/M at 271 MHz has been detected from 30 feet away. What should you do?      a.  re-measured from a distance of 10 feet  b.  this is fine, no logging required  c.  check all the amplifiers and nodes  d.  this is fine, logging is required   view QuestionExp show TheAnsw e 39 . True or False: Group delay is defined as the rate of change of phase with respect to frequency, the amplitude ripple produces fine-grained phase ripple, which in turn may result in large group delay ripple.     True False   view QuestionExp show TheAnsw e
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40 . A ___ is a device that is used to measure the amplitude of a forward path signal.      a.  spectrum analyzer  b.  signal leakage meter  c.  optical power meter  d.  time domain reflectometer  e.  signal level meter   view QuestionExp show TheAnsw e 41 . True or False: The FCC rules require that all signal leakage of 20uV/meter measured at a distance of 10 feet in the aeronautical bands, must be logged and repaired.     True False   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS16   1 . ** CORRECTED ** What type of interference is displayed?   sparkles electric 22645   view QuestionExp show TheAnsw e 2 . What is happening here with the analog channel?
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     a.  low RF levels  b.  high MER levels  c.  too much power  d.  bad isolator or ground block or bonding   view QuestionExp show TheAnsw e 3 . A double image of the same picture in an analog television channel is called:      a.  ghost  b.  hum  c.  snowy or grainy  d.  motion smear   view QuestionExp show TheAnsw e 4 . This is a ___ modulation distortion.
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cross 22654   view QuestionExp show TheAnsw e 5 . Slow moving but identifiable patterns on the TV screen can be caused by:      a.  interfering signals  b.  noise  c.  low RF  d.  impedance mismatch  e.  high SRL   view QuestionExp show TheAnsw e 6 . This is a ___ order distortion.
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third 22651   view QuestionExp show TheAnsw e 7 . What may be the cause of this impairment on a single channel?
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     a.  improperly installed connectors or excessive splitters  b.  bad return amplifier  c.  poor combining at the headend  d.  poor grounding at the pedestal or street cabinet   view QuestionExp show TheAnsw e 8 . Ghosts may be leading (to the ___ of the stronger image) or following (to the ___).      a.  left, right  b.  right, left   view QuestionExp show TheAnsw e 9 . Here is an impairment called ___, caused by composite second order distortions.
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     a.  herringbone pattern  b.  hum  c.  macroblocking  d.  leading ghost   view QuestionExp show TheAnsw e 1 0 . True or False: A stationary vertical band in an analog picture may be an indicator of severe ingress.     True False   view QuestionExp show TheAnsw e 1 1 . The cause of horizontal rolling bars may be: hum 39829   view QuestionExp show TheAnsw e 1 2 . What is the cause of this distortion?
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     a.  a misadjusted amplifier, such as high output levels  b.  improper bonding / ground at the telephone pole or station cabinet  c.  low levels at the optical node  d.  defective customer TV   view QuestionExp show TheAnsw e 1 3 . True or False: Excessive intermodulation, low C/N or hum in a downstream digital signal typically will cause the picture to macroblock.     True False   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS17   1 . Sweep is a measurement of relative ___ from the headend multiplexer to an amplifier output.   gain 22694   view QuestionExp show TheAnsw e 2 . True or False: The phrase "sweep an amplifier" refers to the process of determining the frequency response by viewing a trace left by a variable frequency generator.     True False  
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view QuestionExp show TheAnsw e 3 . True or False: Poor sweep response will never effect noise and distortion performance of a network.     True False   view QuestionExp show TheAnsw e 4 . True or False: The FCC or OfComm does NOT require sweep and balance.     True False   view QuestionExp show TheAnsw e 5 . A sweepless system does not require a ___, a receiver in the HFC measures the amplitude of the available active carriers already on the system to create a frequency response trace.   transmitter 22696   view QuestionExp show TheAnsw e 6 . When sweeping downstream, peak to valley (trough) is the measure of what?      a.  The overall gain variation as a function of frequency  b.  The delta between the video and audio carrier in the worst channel  c.  The delta between the highest video carrier and the lowest digital carrier  d.  The highest and lowest video carrier   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers BDS18   1 . According to FCC regulations, in a system utilizing 500 MHz of bandwidth, the maximum allowable carrier level difference between any two channels at the customer's terminal is ___ dB.   12 22704   view QuestionExp show TheAnsw e 2 . What is the FCC minimum required signal level after 100 feet of drop cable attached to a tap? ___ dBmV
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  3 22706   view QuestionExp show TheAnsw e 3 . FCC rules state in part that semi-annual proof of performance tests for 24 hour signal amplitude must be conducted in January and ___.   july 22708   view QuestionExp show TheAnsw e 4 . The FCC's in-home standard allows a maximum hum modulation of ___ %.   3 22702   view QuestionExp show TheAnsw e 5 . Per the FCC, signal leakage measurements must be taken using a dipole antenna and must NOT exceed ________ uV/M at a distance of three meters.   20 22700   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers BDS19   1. Which are required steps of aerial installation of coaxial? (choose all that apply)        a.    secure permits required to do work    b.    loading the coax on the truck    c.    understand cable route    d.    all trucks are serviced prior to usage   view QuestionExp show TheAnsw e 2. Various types of ___ will be required for all strand-supported cable and self- supporting cable.   guying 22788  
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view QuestionExp show TheAnsw e 3. Match the clearances and separations used during aerial construction.       Column A Your Answer   Column B   1.  Power Lines 22741 22741,22743,227  =   e   22744,2275 a. 15.5 feet   2.  Public Roads 22743 22741,22743,227  =   a   22744,2275 b. 12 inches   3.  Pedestrian Traffic 22745 22741,22743,227  =   d   22744,2275 c. 3 feet   4.  Railroads 22747 22741,22743,227  =   f   22744,2275 d. 10 feet   5.  Peaked Roof Buildings 22749 22741,22743,227  =   c   22744,2275 e. 40 inches   6.  Telephone 22751 22741,22743,227  =   b   22744,2275 f. 23.5 feet   view QuestionExp show TheAnsw e 4. True or False: In some situations conduits can be used to bond cable to the electrical ground system, depending on the conduit type and code requirements.     True False   view QuestionExp show TheAnsw e 5. The ground and bonds at a pole are specified by the:      a.  cable company  b.  telephone company  c.  electric company  d.  pole owner  e.  contractor installing services on the pole   view QuestionExp show TheAnsw e 6. What is the dimensions of the expansion loop separation from the strand?
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     a.  6 inches or 15 cm  b.  12 inches or 30 cm  c.  18 inches or 45 cm  d.  24 inches or 60 cm   view QuestionExp show TheAnsw e 7. All cables installed in the outside plant (OSP) should be ___ before cable connectors are installed.   tested 22786   view QuestionExp show TheAnsw e 8. What type of pedestal is shown?      a.  Line Extender / Splitter / Tap plate  b.  Tap plate / Splitter
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 c.  Tap Mounted to Stake  d.  Trunk Amplifier Pedestal   view QuestionExp show TheAnsw e 9. Economy blocks are used to support a ___ cable prior to lashing.      a.  group of cables  b.  dual  c.  single  d.  strand   view QuestionExp show TheAnsw e 10 . True or False: Grounding and bonding equipment must be listed by a federal executive department, NOT an independent agency.     True False   view QuestionExp show TheAnsw e 11 . Poor bond strength between the dielectric and the center conductor of a coax cable:      a.  creates kinking of the coax more easier  b.  makes cable connectorization easier  c.  allows grounding, bonding or isolation to have a lower wattage  d.  changes the minimum bending radius   view QuestionExp show TheAnsw e 12 . During the safety check, the integrity of any cable telecommunications equipment used during construction is verified. Which of the following would be involved in a safety check? (Choose 3)        a.    pole risers    b.    pole guying    c.    dead ending on poles    d.    pole material   view QuestionExp show TheAnsw e 13 . Dynamometers measure the pulling ___ applied to cables.
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  tension 22735   view QuestionExp show TheAnsw e 14 . The best method to install coaxial cable that will have the least visible damage to a road surface.      a.  trenching machine  b.  boring machine  c.  plowing machine  d.  bucket truck   view QuestionExp show TheAnsw e 15 . A ___ swivel is used to allow cables or conduits being pulled to swivel and will ensure that the recommended pulling tension is not exceeded.   breakaway 22772   view QuestionExp show TheAnsw e 16 . Lashing is done when the coax is being paid out during this installation method.      a.  drive-off method  b.  back-pull method  c.  push-pull method  d.  dead ending   view QuestionExp show TheAnsw e 17 . True or False: Before pulling out cable onto the strand, make sure all guying is installed properly.     True False   view QuestionExp show TheAnsw e 18 . Name of the equipment shown.
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     a.  set-up chute  b.  Cable Lasher  c.  Cable Overlash Puller  d.  Multiple Cable Puller   view QuestionExp show TheAnsw e 19 . Required to minimize the potential difference between the systems ___.      a.  ground the cable shield to a structures electrical system  b.  couple the cable shield to a structures electrical system  c.  secure the cable shield to a structures electrical system  d.  reduce the hum on the line   view QuestionExp show TheAnsw e 20 . True or False: To prevent the end of a lashing wire from accidentally causing a serious injury, end of the lashing wire must be covered by the lashing wire clamp.     True False   view QuestionExp show TheAnsw e 21 This device is used to route cables through inside or outside corners up to 90º, to ensure the cable does NOT exceed its minimum bending radius.
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.      a.  corner block  b.  bender Board  c.  reel brakes  d.  economy block   view QuestionExp show TheAnsw e 22 . The use of dissimilar materials in certain environments (such as soil) is likely to cause ___ of the less noble metal, and should be considered in the selection of individual components.      a.  galvanic corrosion  b.  ingress  c.  structural return loss  d.  egress  e.  a buildup of voltage   view QuestionExp show TheAnsw e 23 . Expansion loops should be on the ___ side of all active and passive devices.      a.  output  b.  input   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers   BDS20   1. True or False: An attempt should be made to build a history of each amplifier for future; this can be a useful tool for troubleshooting or predicting potential future problems.     True False   view QuestionExp show TheAnsw e 2. Which of the following is NOT an active device verification test?      a.  Power-up test  b.  Frequency response test
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 c.  Return loss test  d.  Structural return loss test   view QuestionExp show TheAnsw e 3. Match each of the following active device verification tests to its purpose.       Column A Your Answer   Column B   1.  Power-up test 39890 39890,39891,39  =   b   39895,39 a. checks the flatness of the device   2.  Return loss test 39891 39890,39891,39  =   c   39895,39 b. checks the operation of the power supply and associated circuits prior to installation   3.  Frequency response test 39892 39890,39891,39  =   a   39895,39 c. checks the impedance match of all the ports on the device   view QuestionExp show TheAnsw e 4. Isolation between passive device ports should be greater than ___ dB.      a.  15  b.  18  c.  22  d.  27   view QuestionExp show TheAnsw e 5.   When should system performance verification be done?      a.  Immediately upon completion of construction  b.  After inspection by the local regulatory agency  c.  After rough balance and sweep testing are completed  d.  After rough balance and before sweep testing are completed   view QuestionExp show TheAnsw e 6. Which of the following is NOT a commonly performed test for coaxial cable?      a.  Structural return loss test
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 b.  Attenuation vs. temperature test  c.  Impedance/TDR test  d.  Frequency vs. attenuation test   view QuestionExp show TheAnsw e 7. True or False: Amplifiers should always be configured so that they can be installed in any location.      True False   view QuestionExp show TheAnsw e 8.   True or False: An initial rough balance is used to set the approximate level and tilt of the RF signals.      True False   view QuestionExp show TheAnsw e 9.   True or False: Verification of the coaxial cable is done after construction since the cable is ready to install upon receipt from the manufacturer.     True False   view QuestionExp show TheAnsw e 10 . True or False: The frequency response test for passive devices checks the components’ ability to pass the desired frequencies without excessive attenuation in any portion of the frequency spectrum.     True False   view QuestionExp show TheAnsw e     I'm Done Reviewing Answers  
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The following data are transmitted in a serial communication system (P is the parity bit). What parity is being used in each case? a. ABCDEFGHP = 010000101 b. ABCDEFGHP = 011000101 c. ABCDP = 01101 d. ABCDEP = 101011 e. ABCDEP = 111011
Q12: CSMA/CD is a protocol used in what Data Link Layer protocol? a. Polling b. Token Passing bus c. Token Passing ring d. Ethernet e. TDMA f. FDMA g. CDMA h. None of the above
Given that the base address is FoH. 1. Create a new asm project “Lab2_Q1.asm". Assume that port A of 8255A PPI is connected to 8085. Write assembly code to send the value of FFH to FoH. Enter a delay of 2 ms for each transmission.
•An ISP is granted a block of addresses starting with 190.100.0.0/16. The ISP needs to distribute these addresses to two groups of customers as follows: •The first group has 64 customers; each needs 128 IP addresses. •The third group has 128 customers; each needs 64 IP addresses. • Write at least the first and last IP addresses for the first two and last two customers in each group.
Question is under attachment.
A digital signaling system is required to operate at 9600 bps. a. If a signal element encodes a 4-bit word, what is the minimum required band-width of the channel? b. Repeat part (a) for the case of 8-bit words.
Question II 1- Suppose AHU is allocated a block of IP address: 200.23.16.0/20. Based on your knowledge on IP addressing, answer the following questions: How many hosts at maximum can AHU supply with public IP addresses? Suppose there are 8 colleges that AHU needs to distribute the IP addresses to Suppose the IP address demand from each college is the same. What will be the block of IP addresses allocated to each college? How many hosts can each college supply with public IP addresses? (e) Suppose there are 6 colleges that AHU needs to distribute the IP addresses to. Two of the colleges request twice as much IP addresses as the other 4. What will be the block of IP addresses allocated to each college? How many hosts can each college supply with publie IP addresses?
a) i) Determine the number of bits per level required when using FSK with 4 different frequencies and QAM with a constellation of 256 points. ii) We want to digitise a signal that contains frequencies between 100 Hz and 1500 Hz, assuming 16 bits per sample. The digitised signal will be transmitted using a QPSK process. Determine the bit rate and the level rate. iii) We need to send 210,000 bits per second over a noiseless channel using 128- QAM. Determine the required bandwidth.
Question 2 Incorrect Mark 0.00 out of 1.00 P Flag question In a self-bias n-channel JFET, the operating point is to be set at Ip = 1.5 mA and Vps =10 V. The JFET parameters are IDss= 5 mA and Vp = 2 V. Given that VDD = 20 V. The value of Rs required for the circuit is Select one: a. 60.3 kohms b. 603 ohms c. 60.3 ohms d. 603 kohms Your answer is incorrect. The correct answer is: 603 ohms
EEE
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