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cable Flashcards

1
Q

The Headend receives multiple signals from outside sources. Which source requires line-of-sight?

A

Microwave

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2
Q

Using a signal level meter (SLM) to view an Analog signal, the video and audio information is carried on two separate frequencies. But when looking at a Digital signal, how many frequencies carry the video and audio information?

A

1

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3
Q

What two ways are Direct Feed signals sent to the Headend?

A

Fiber or Coaxial

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4
Q

Some cable systems use Hubs, or secondary Headends. How can Hubs send and receive information to each other, as well as to the Headend?

A

Microwave, Coaxial, or Fiber

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5
Q

The standard test performed on Digital signals to determine noise in a signal is the modulation error ratio (MER) test. When using the signal level meter (SLM), what is an acceptable MER for a 256 QAM signal?

A

32 dB

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6
Q

You have arrived at an installation, and greeted your customer. You verify the services to be installed, and begin your “site survey”. Once you have located the aerial TAP, you realize the distance from the TAP to the house is 185 feet. What type and size drop cable do you install?

A

. Series 11 messengered

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7
Q

The opposition to signal flow is known as _________

A

impedance

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8
Q

The amount of attenuation that a cable has is based on _________.

A

cable manufacturer specifications

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9
Q

You are at a reconnect and have found the aerial tap location. You check signal at the tap and the signal level is 5 dBmv. You connect the drop and check signal at the other end where the ground block is and you get a signal level of -2 dBmv. How much signal have you lost?

A

7 dB

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10
Q

After the RF signals are combined into one broadband signal in the Headend, what must happen to the signal before it can be transmitted over fiber-optic cable?

A

The signal must be converted to light

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11
Q

One of the three factors that defines a coaxial cables’ impedance is the ______________.

A

properties of the dielectric material

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12
Q

What are the three basic parts that make up an F-connector?

A

Body, nut, post

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13
Q

In a hybrid fiber-coaxial system:

A

the trunk is fiber, the feeder and drop system are coaxial

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14
Q

This computer is located in the Headend, and communicates directly to the cable modem in the customer premises.

A

CMTS

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15
Q

What tool do you use to check signal level at any given point in the drop system?

A

SLM

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16
Q

There are a few different types of house/drop amplifiers, but all of them are designed to raise signal levels. If a Cable Modem is not working properly, what type of amplifier could be causing the problem?

A

One-way amplifier

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17
Q

The signal loss from a splitters’ output port to another output port on that same splitter is known as ________.

A

. isolation

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18
Q

The primary function of line extenders is to extend signals farther down the feeder line into the service area. As they do this, what do line extenders add to the signal?

A

Noise and distortion

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19
Q

A two-way splitter divides the signal evenly across the two outputs. Approximately how much signal is lost from input to output on a two-way splitter?

A

4 dB

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20
Q

You have arrived at an install and realize that a cable must run through the space between the ceiling and the roof of the building, which is used for the HVAC system. What type of cable must you use?

A

CATVP

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21
Q

What expression is used for an absolute measurement of signal level/power?

A

dBmV

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22
Q

The direction of signal that flows from the Headend towards the customer premises is known as _______.

A

forward

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23
Q

A directional coupler __________.

A

divides the signal unevenly

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24
Q

What type of flooding compound is used in aerial drop cable?

A

. Non-flowing type
Your Answer
c. Flowing type

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25
Q

Between two points on the same cable, which frequency will have the LEAST amount of attenuation?

A

900 kHz

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26
Q

In a “Tree and Branch” design, which of the following is true?

A

Coaxial trunk and feeder is used to send the signal into the service area

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27
Q

What is the frequency range used for the Return path?

A

5 MHz - 47 MHz

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28
Q

Which two parts make up the underground drop endpoints?

A

TAP and groundblock

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29
Q

Which shovel would you use to hand bury a drop cable through a customers’ grass?

A

Sod-cutter

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30
Q

Which of the following steps would you perform to complete a reconnect at the TAP?

A

Apply a thin coat of silicone grease to the TAP port threads

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31
Q

The attachment hardware that you would install on the steel strand, near the TAP is called a _______.

A

span clamp

32
Q

A device that requires electrical power to operate is ________.

A

an active device

33
Q

When attaching a span clamp near the tap, how much clearance should you leave around the pole, and from the face of the pole?

A

30 inches

34
Q

You are at an install on a two-story home. You have to run the interior drop cable from the second floor to the first floor vertically inside the wall. Which type of jacketed cable do you install?

A

CATVR

35
Q

When installing a drop system at the customer’s location, which of the following is critical for the safety of the customer and the installer?

A

Bond the cable equipment to the common ground

36
Q

When you run cable through an existing conduit, where should you set the cable caddy?

A

. At the opposite end of the conduit from where you start the fish tape

37
Q

The output signals of a four-way splitter most closely resemble the output signals of __________

A

. a two-way splitter with another two-way splitter on each output port

38
Q

What is an example of an active device?

A

Drop amplifier

39
Q

Bonding is ___

A

when the cable system ground wire is attached to the same location as the other systems of the home

40
Q

When you install an aerial drop and have to attach to a sub-pole, what hardware needs to be installed on the pole

A

. J-hook

41
Q

Grounding is _

A

establishing an electrical connection to Earth ground

42
Q

If bonding to the #6 copper wire is not available, and you must bond to the electrical mast, what bonding hardware do you use?

A

A ground strap

43
Q

In a hybrid fiber-coax (HFC) system, what has to happen to the signal at the node on the return path?

A

It has to be converted to light

44
Q

When climbing the 28’ extension ladder, how many rungs from the top should you stop and check for voltage?

A

3

45
Q

You are reconnecting service at the customer location. You inspect the drop and replace and weatherproof a few connectors that no longer met quality standards. Inside the house, you examine the cables and connectors, and they look fine. What is the next step?

A

Ask the customer to turn on the TV

46
Q

What is the current standard for ANALOG TV systems in the United States

A

NTSC

47
Q

You are preparing to replace the drop cable for a single customer premises in a multiple dwelling unit (MDU). The cable was damaged during a recent building repair. While you are surveying the premises, you discover that the cable must run through overhead air ducts. What type of cable should you use?

A

Use plenum jacketed cable

48
Q

The drop cable you are installing is series 6 cable. What is the minimum size bonding wire that can be used with series 6?

A

14

49
Q

What are two factors that determine signal attenuation between two points along a cable?

A

Cable diameter and temperature

50
Q

What three factors are the primary determinants of a cables’ impedance?

A

The diameter of the center conductor, diameter of the outer conductor, and the properties of the dielectric foam

51
Q

The installation will involve connecting the TV, a VCR, and a Set-top box. Starting from the jumper from the wall, what is the proper order of the equipment?

A

Set-top box, VCR, TV

52
Q

The type of connection between the set-top box and the TV makes a difference in the quality of the video and audio. Of the connections listed below, which would provide the best quality video?

A

Component video

53
Q

The frequency range commonly used by cable providers is _____.

A

5 MHz - 1 GHz

54
Q

There are many safety precautions you should observe when you are running cable through a customers’ attic. In order to avoid falling through the ceiling, where should you walk while working in the attic?

A

On the ceiling joists

55
Q

When you attach cable to the exterior wall, you must place attachment points to avoid the possibility of harmonic reflections. What is the best way to avoid creating harmonic reflections?

A

Randomly vary the distance between the attachment points

56
Q

An example of a passive device is _______.

A

a directional coupler

57
Q

In a hybrid fiber/coax (HFC) system, what has to happen to the forward signal at the fiber node?

A

It has to be converted to electrical energy

58
Q

A directional coupler _______.

A

allows the majority of the signal to pass through, while tapping off a small amount

59
Q

In a T568A wiring configuration, which colored wire goes in pin 5?

A

White/Blue

60
Q

The process a cable modem must go through to be authorized for use in a cable network is known as ________.

A

Provisioning

61
Q

This type of filter creates more signal loss on the return. The purpose is to have the CMTS instruct a cable modem or eMTA to transmit return at a higher signal level

A

Step attenuator

62
Q

You arrive at the customer premises to install basic and standard programming. The customer tells you her TV only gets thirteen (13) channels.

A

Installing a STB will get her more channels

63
Q

What download speed is generally considered “High-Speed Data”?

A

640 kbps or faster

64
Q

How many pairs of wires are in a Quad-wire?

A

2

65
Q

When attaching cables and drilling holes in an MDU, you must get written permission. What is the documentation you need?

A

Right of Entry Agreement

66
Q

What is the standard aspect ratio for HDTV?

A

16:9

67
Q

The term DOCSIS stands for ________.

A

Data Over Cable Service Interface Specification

68
Q

For telephone service, you need a pair of wires to complete the positive and negative of the circuit. They are called the “tip” and “ring”. Which wires are positive and negative?

A

The “tip” is positive and the “ring” is negative

69
Q

A punch down block is made up of rows and columns to connect multiple lines. What is connected for a single phone line/number to work?

A

2 rows per line/number

70
Q

The phone company typically installs a box on the utility side of the house for their service drop and connections. What is that box called?

A

NID

71
Q

The minimum bending radius for coaxial cable is _________.

A

Approximately 10 times the cables diameter

72
Q

You know that you should follow the cable operator’s guidelines and local ordinances when checking a TAP and drop during a reconnect. What is the basis for most cable operator’s electrical standards?

A

NEC/NESC

73
Q

Within a MoCA system, the POE filter is designed to

A

block all frequencies above 1 GHz

74
Q

When a customer has an alarm system in the home, the phone service must be connected to the alarm panel. What device in the alarm panel is the phone service connected to?

A

RJ-31X

75
Q

The impedance of the female F-port on the back of a customer’s TV is _______.

A

75 ohms

76
Q

The coaxial cable must maintain an impedance of 75 ohm, and should never change. Without changing the impedance, the minimum bending radius is described as _________.

A

the tightest bend that can be safely applied to the cable, after it has been removed from the spool

Cable (1 decks)

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