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Dan2024 Study > NCT4 Jeopardy questions > Flashcards

NCT4 Jeopardy questions Flashcards

1
Q

Federal agency created to regulate electronic communications. Name and year created.

A

Federal Communications Commission (FCC) 1934

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2
Q

Signal impairment usually caused by jitter or instability in oscillators.

A

Phase Noise

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3
Q

Figure of merit derived from the number and severity of leaks in a cable system.

A

CLI (Cumulative Leakage Index)

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4
Q

Document that contains a snapshot of the interference potential to aircraft communications over a cable system.

A

Form 320

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5
Q

Method to collect leakage data using and airplane.

A

Fly-Over

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6
Q

E=IxR

A

Ohm’s Law

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7
Q

Two types of network power supplies used by Comcast.

A

Stand-by and Non-Stand-by

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8
Q

Design where one power supply powers all the actives in a node or multiple nodes.

A

Centralized Power

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9
Q

Best test for battery health.

A

Load Test

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10
Q

The two most common digital modulation schemes used by Comcast.

A

QPSK and QAM

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11
Q

These two modulation schemes allow multiple devices to share the same upstream on the Comcast HFC network.

A

TDMA (Time Division Multiple Access) and SCDMA (Synchronous Code Division Multiple Access)

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12
Q

This network amplifier is used to compensate for the higher loss in feeder and customer drops.

A

Bridger Amplifier

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13
Q

Used, along with the DSAM, for NON-INTRUSIVE isolation of ingress.

A

“I-STOP” or “Spark-Plug”

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14
Q

This map is similar to a street map and includes features such as lakes, rivers, streets, and boundaries.

A

Base Map

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15
Q

This map offers the layout of the system in a condensed form.

A

Tree Map

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16
Q

The two main manufacturers of coaxial cable.

A

CommScope and Trillogy

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17
Q

Used to counteract horizontal forces placed on poles by the strand.

A

Guys and Anchors

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18
Q

Passive device which divides the signal into two transmission lines in parallel.

A

Directional Coupler

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19
Q

Tool used to measure signals at specific tunable frequencies.

A

SLM (Signal Level Meter) or DSAM (Digital Signal Activation Meter)

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20
Q

Tool uses a dipole antenna to detect signal leakage and determine its direction.

A

Sniffer (Leak Detector)

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21
Q

Tool which accurately measures voltages in waveforms other than just sine waves.

A

True RMS (Root Mean Square) meter or RMS VOM (Volt Ohm Meter)

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22
Q

Tool used to find underground communications lines.

A

Cable Locator

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23
Q

This tool is used to determine the distance of a known fault from a specific location.

A

TDR (Time Domain Reflectometer)

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24
Q

This tool is used to determine the distance of a known fault in the optical fiber network.

A

OTDR (Optical Time Domain Reflectometer)

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25
Q

This resource tool can differentiate between plant problems and drop problems in the HFC network.

A

Scout Flux

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26
Q

This resource tool makes offline data management, markup, and synchronization effortless.

A

Spatial

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27
Q

This resource tool provides real time snapshot and maps all aspects of the network including power and facilities.

A

National Watchtower (NWT)

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28
Q

Thin wire wrapped around the fiber and coaxial cables to secure them to the strand.

A

Lashing Wire

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29
Q

Used to secure lashing wire.

A

Bug Nut (a.k.a. Lashing Wire Clamp)

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30
Q

This is the load bearing component of aerial coaxial cable.

A

Strand

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31
Q

This is the load bearing component of aerial drop cable.

A

Messenger

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32
Q

The strand is made of this.

A

Zinc Coated Galvanized Steel

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33
Q

The two most common sizes of strand.

A

1/4 inch and 3/8 inch

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34
Q

Breaking Weight for 1/4 inch strand

A

3900 Lbs.

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35
Q

Breaking Weight for 3/8 inch strand

A

6900 Lbs.

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36
Q

Weight per foot of 1/4 inch strand

A

0.121 LB per FT

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37
Q

Weight per foot of 3/8 inch strand

A

0.270 LB per FT

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38
Q

Used at locations where the cable is not attached to the strand by lashing wire.

A

Straps and Spacers

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39
Q

Minimal passing score for CLI according to the FCC.

A

64

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40
Q

Two types of voltages used by power supplies in the Comcast HFC network.

A

60 Volts and 90 Volts

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41
Q

Intentionally formed in the cable to compensate for expansion and contraction due to temperature.

A

Expansion Loop

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42
Q

Connects the pole line hardware to the anchor.

A

Down Guy Wire

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43
Q

Buried metal device used to transfer force from the pole to the ground.

A

Anchor

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44
Q

Yellow plastic cover used to protect the guy and make it more visible.

A

Guy Wire Guard

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45
Q

Guy wire used at the end of the line.

A

Terminal Guy

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46
Q

Guy used when the strand changes direction.

A

Side Guy

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47
Q

Guy used to establish clearance using a stub pole.

A

Pole to Stub Guy

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48
Q

Guy using an in-line pole as an anchor.

A

Pole to Pole Guy or Span Guy

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49
Q

Guy uses horizontal strut to provide overhead clearance.

A

Sidewalk Guy

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50
Q

Guy used when straight poles are subjected to extreme sideward forces typically from wind.

A

Storm Guy

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51
Q

Anchor which is directly torqued into the ground causing minimal ground disturbance.

A

Screw Anchor

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52
Q

Anchor designed for soft soil.

A

Never Creep Anchor

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53
Q

Anchor designed to expand in holes bored into concrete or rock.

A

Rock Anchor

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54
Q

Connects the anchor to the down guy wire.

A

Anchor Rod

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55
Q

This device, usually a screw, connects the center conductor to an active or passive device.

A

seizure mechanism (seizure screw)

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56
Q

Tool which prepares coaxial cable for splicing.

A

Cable Coring Tool

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57
Q

In WD-40, what does “WD” stand for?

A

Water Displacement

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58
Q

Tool specifically designed to cut coaxial cable.

A

Banana Cutters

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59
Q

Tool used to cut wire with a diagonal head.

A

Diagonal Cutters

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60
Q

Tool used to cut wires and is a combination of 9 inch pliers and wire cutters.

A

Nines (side cutters)

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61
Q

Tool used to score the aluminum sheath of coaxial cable

A

pipe cutter

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62
Q

Tool uses plastic blades to prepare the center conductor of coaxial cable

A

Center Conductor Cleaner (Gator Tool)

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63
Q

Type of connector commonly used to attach coaxial cable to active and passive devices

A

Pin Connector

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64
Q

Connector used to connect two devices directly to each other

A

Housing to Housing adapter (H2H)

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65
Q

Adapter used to connect different sizes of coaxial cable

A

Universal Splice Block

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66
Q

Connector used to connect hardline coaxial cable to regular drop cable

A

Cable to F connector

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67
Q

Connector used to convert the threaded connector of a device into a female F connector

A

Pin to F connector

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68
Q

75 Ohm device used to end RF signal

A

75 Ohm Terminator

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69
Q

Material used to prevent moisture from entering the connector

A

Shrink Boot

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70
Q

Device used to prevent dangerous sag in strand during installation

A

Strand Brake

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71
Q

Device used to prevent unwanted pay-off of strand or cable from the trailer during installation

A

Reel Brakes

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72
Q

Portable bonding connection used during strand installation

A

Traveling Ground

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73
Q

Installation of pole hardware before the installation of strand

A

Pole Framing

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74
Q

Metal pulley used to assist in the strand installation

A

Snatch Block

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75
Q

Attaches the strand to the pole

A

Suspension Clamp

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76
Q

Two methods of strand installation are?

A

Stationary Reel and Drive Off (Moving Reel)

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77
Q

Used to form expansion loops into coaxial cable

A

Mechanical Bender

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78
Q

Used to measure the tension of cables

A

Dynamometer

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79
Q

This swivel will unlink at a specific tension to ensure that the cable pulled in not over-tensioned

A

Breakaway Swivel

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80
Q

Used to support multiple cables in independent rollers without a cable positioner

A

Multiple Cable Block

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81
Q

Used to support one cable prior to lashing

A

Single roller Block

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82
Q

Attached directly to the pole to support self-support cable during installation

A

Pole Mount Block

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83
Q

Single block with no roller

A

Economy Block

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84
Q

Used to route cable through inside or outside corners either 90 or 45 degrees during installation

A

Corner Block (90 or 45)

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85
Q

Guides the cable from the reel to the strand during installation

A

Set Up Chute

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86
Q

Supports corner blocks or set up chutes in mid-span locations

A

Set Up Bracket

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87
Q

Used to lash cable to the strand

A

Cable Lasher

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88
Q

Allows more than one cable to be pulled into place when lashing directly to the strand

A

Multiple Cable Puller

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89
Q

Allows multiple cables to be pulled into place in overlash applications

A

Overlash Puller

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90
Q

Used to push equipment ahead of a pulled lasher

A

Cable Block Pusher (Shuttle or Shotgun)

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91
Q

Pushed in front of a lasher to uniformly position multiple cables for lashing

A

Magic box (Cable Positioner)

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92
Q

Used to place the cable into the lasher in drive off applications

A

Cable Guide

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93
Q

Used to lift blocks and cables into position

A

Lay Up Stick

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94
Q

Placed on the end of the lay up stick to prevent damage to cable

A

Cable Lifter (Lay up stick head)

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95
Q

Placed on the end of the lay up stick to place blocks midspan

A

Block Lifter

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96
Q

Minimum clearance for cable below power both at the pole and at midspan, give both answers.

A

40” at pole 30” at midspan

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97
Q

Minimum clearance for cable below the transformer

A

30”

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98
Q

The resistance of a circuit to the flow of AC alternating current

A

Impedance

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99
Q

Tension in the cable during installation cased by the mass of cable on the reel and reel brakes

A

Tail Loading

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100
Q

The mechanical bender is left in place until the next span is lashed by how far?

A

50 feet or 1/3 distance to next pole, whichever is longer

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101
Q

Method where expansion loops are located on the output side of the pole as indicated by feeder direction

A

Feeder Dominant

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102
Q

When two perpendicular strands end at the same pole

A

Double Dead End

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103
Q

Cable blocks are spaced by how far?

A

30 to 50 feet

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104
Q

Ends of the cable left extra for splicing

A

Cable Tail

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105
Q

Articles of the NEC dealing specifically with bonding and grounding, name both.

A

Article 250 General bonding and Article 820 Coaxial Cable bonding

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106
Q

Pipe usually made of PVC used to house and protect cable underground

A

Conduit

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107
Q

Protective covering for cable where it transitions from aerial to underground

A

Riser Guard

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108
Q

Required dimensions for riser guard at the pole

A

8 feet above ground 8 inches below ground

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109
Q

Required dimensions for riser guard at the house

A

4 feet above ground 8 inches below ground

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110
Q

Color code for underground locates for power

A

Red

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111
Q

Color code for underground locates for Gas

A

Yellow

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112
Q

Color code for underground locates for communication lines

A

Orange

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113
Q

Color code for underground locates for potable water

A

Blue

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114
Q

Color code for underground locates for irrigation and reclaimed water

A

Purple

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115
Q

Color code for underground locates for sewage and drainage

A

Green

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116
Q

Color code for underground locates for proposed excavation

A

White

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117
Q

Color code for underground locates for temporary survey markings

A

Pink

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118
Q

Highly visible material buried directly above the cable, answer name and depth.

A

Warning Tape at 12 inches below ground

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119
Q

In trenching applications, cable must be buried how far above power and how far below surface?

A

12 inches above power, 24 inches below surface

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120
Q

What is a Hog?

A

A missile

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121
Q

What is a Missile?

A

A Hog

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122
Q

International Telecommunications standard that permits high speed data transfer on an existing CATV system

A

DOCSIS

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123
Q

DHCP

A

Dynamic Host Configuration Protocol

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124
Q

CMTS

A

Cable Modem Termination SYSTEM

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125
Q

Converts RF to Ethernet and visa versa

A

CMTS (Cable Modem Termination System)

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126
Q

This is when there is no response from the CMTS to a modem ranging request

A

T3 timeout (typically upstream impairment)

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127
Q

This is when there is no response from the CMTS to a modem periodic maintenance request

A

T4 timeout (typically downstream impairment)

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128
Q

Bandwidth of a standard digital carrier

A

6mHz

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129
Q

Ability of the system to combine digital carriers in order to increase bandwidth

A

Channel Bonding

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130
Q

Connection point where optical signal is converted to RF to serve individual customers

A

Node

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131
Q

This is a series of Reed Solomon (RS) symbols

A

Codeword

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132
Q

Name and number all layers of the OSI model

A
  1. Physical 2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application
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133
Q

Unit of measurement in the physical layer of the OSI model

A

bit

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134
Q

Unit of measurement in the Data Link layer of the OSI model

A

frame

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135
Q

Unit of measurement in the network layer of the OSI model

A

packet

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136
Q

Units of measurement in the transport layer of the OSI model

A

Segment or Datagram

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137
Q

Unit of measurement in the Session, Presentation, and Application layers of the OSI model

A

data

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138
Q

List, in order, the order of priorities for network maintenance tasks (NT4)

A
  1. Outages 2. Priority Plant Faults 3. Service Call Clusters 4. RTM 5. Plant faults (demand) 6. General Maintenance Work (preventative)
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139
Q

Circuits to direct AC power onto specific output legs of a network amplifier

A

Power Passing Chokes

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140
Q

Connector used for a low resistance connection to complete a circuit and allow power to pass

A

Shunt (fuse)

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141
Q

Minimum safe distance from 300 VAC power

A

avoid direct physical contact

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142
Q

Minimum safe distance from 300-750 VAC power

A

12 inches

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143
Q

Minimum safe distance from 750-2000 VAC power

A

18 inches

144
Q

Minimum safe distance from 2000-15000 VAC power

A

24 inches

145
Q

Minimum safe distance from 15000-37500 VAC power

A

36 inches

146
Q

Minimum safe distance from 37500-87500 VAC power

A

42 inches

147
Q

Minimum safe distance from 87500-121000 VAC power

A

48 inches

148
Q

Minimum safe distance from 121000-140000 VAC power

A

54 inches

149
Q

Combining AC voltage from two different network power supplies, resulting in damage

A

Bucking Power

150
Q

HFC plant design where the output of each active in the forward path is the same

A

Unity Gain

151
Q

HFC plant design where the input of each active in the return path is the same

A

Unity Gain

152
Q

I-Stop is manufactured by

A

Trillithic

153
Q

“Sparkplug” is manufactured by

A

Signal Vision

154
Q

This lets the XOC know that service will be interrupted and checks for any active 911 calls

A

TSI (Temporary Service Interruption)

155
Q

Fieldview uses a single frequency for telemetry data. This is known as what?

A

Narrow Casting

156
Q

This converts 60 or 90 volts AC to 24-28 volts DC

A

Power Pack

157
Q

This is defined as two or more Comcast Xfinity customers without service due to the same root cause.

A

Outage

158
Q

Difference, in dB, of a signal injected into one output port of a device and measured on another output port of the device.

A

Port to Port Isolation

159
Q

Name the three portions of the HFC network.

A

Transportation, Distribution, Drop

160
Q

Name the active devices in the Comcast HFC network.

A

Nodes, Amps, LE’s, Power Supplies

161
Q

Converts optical signal to RF in a neighborhood.

A

Node

162
Q

List the four components of a node.

A

Optical Receiver(s), Optical transmitter(s), Power Supply, and Forward/return Amp Module(s)

163
Q

Separates or combines the forward and return signals.

A

Diplex Filter

164
Q

Percentage of optical modulation driving a laser transmitter

A

Optical Modulation Index

165
Q

Provides a “flat” input to the first stage amplification in an amplifier

A

Input Equalizer (or also Cable Simulator if clarification is requested)

166
Q

Component that has attenuation that replicates the normal attenuation of cable.

A

Cable Sim (Cable Simulator) or Cable Equivalency

167
Q

Component that has attenuation opposite to that of normal cable

A

Equalizer

168
Q

This changes the gain and tilt of an amplifier to hold the output constant based on input levels

A

ALS (automatic level and slope)

169
Q

This changes the gain of an amplifier based on fluctuating input levels

A

AGC (automatic Gain Control)

170
Q

RF carrier used bit the ALS or AGC to maintain a constant output level.

A

Pilot Carrier

171
Q

This uses temperature changes to increase or decrease the output of an amplifier

A

Thermal Level Control

172
Q

Used in amplifiers to compensate for frequency response “signatures” of passive and active devices.

A

Mop Up

173
Q

RF portion of the cable plant fed from a node.

A

Node Service Area

174
Q

Process of injecting a signal into an amplifier test point to set up the return portion of the amplifier.

A

Return Sweep

175
Q

Aeronautical Navigation Frequency ranges.

A

108 to 137 MHz and 225 to 400 MHz

176
Q

FCC rules for aeronautical bands in cable systems where average signal strength is 38.75 dBmv or more.

A

76.610

177
Q

FCC rules regarding fly-over and ground based leakage monitoring

A

76.611

178
Q

FCC rules regarding offset frequencies

A

76.612

179
Q

FCC rules regarding harmful interference requiring immediate repair

A

76.613

180
Q

FCC rules regarding leakage monitoring and the recording of leaks and leak repairs

A

76.614

181
Q

FCC rules regarding adding or changing a carrier in the aeronautical bands

A

76.615

182
Q

FCC rules regarding specific emergency frequencies

A

76.616

183
Q

FCC rules regarding customer equipment and any device connected to the RF plant

A

76.617

184
Q

The frequencies regularly associated with LTE

A

700 to 800 MHz

185
Q

Maximum allowable seasonal and diurnal signal level variation according to DOCSIS specification

A

8dB (+/- 4dB)

186
Q

Maximum allowable egress according to FCC for frequencies below 54 MHz

A

15 microvolts per meter at 30 meters

187
Q

Maximum allowable egress according to FCC for frequencies between 54 and 216 MHz

A

20 microvolts per meter at 3 meters

188
Q

Maximum allowable egress according to FCC for frequencies above 216 MHz

A

15 microvolts per meter at 30 meters

189
Q

List all information required in the CLI log according to FCC.

A

Date found, Location, Cause, Strength of leak, distance to leak, date repaired, and measurement after repair

190
Q

Fly over is performed at what altitude, according to FCC.

A

1500 feet or 450 meters

191
Q

Plant design topology where signals are sent long distances by trunk cables and has branches for signal to be sent to customers.

A

Tree and Branch

192
Q

Typical wavelengths used by Comcast for forward and return signals in the fiber optic network

A

1550 nm Forward 1310 nm Return

193
Q

Network Architecture where nodes, hubs, or headends may be connected with fiber optic cables to provide redundancy or increased reliability.

A

Ring Architecture

194
Q

The distance between two points of like phase in a waveform

A

Wavelength

195
Q

This is the attenuation in single mode fiber for 1310 nm wavelength

A

0.35 dB/Km

196
Q

This is the attenuation in single mode fiber for 1550 nm wavelength

A

0.25 dB/Km

197
Q

Three components of fiber.

A

Core, Cladding, and Coating

198
Q

Diameter of fiber core.

A

8 to 10 microns

199
Q

Diameter of fiber cladding.

A

125 microns

200
Q

Diameter of fiber coating.

A

250 microns

201
Q

Minimum diameter of a fiber.

A

125 microns (coating is removed during splicing)

202
Q

Compares the speed of light through a material to the speed of light in a vacuum.

A

Index of Refraction

203
Q

Compares the speed of a RF signal trough a cable to the speed of light in a vacuum.

A

Velocity of Propagation

204
Q

Occurs when light in continually reflected between two materials with different refractive indices.

A

Total Internal Reflection

205
Q

The RF distribution system contains?

A

Coax cable, actives, and passives

206
Q

GaAs

A

Gallium-Arsenide

207
Q

Separates or combines the RF signal with AC current.

A

Power Diplex

208
Q

Attenuates the signal in an amplifier to bring it into acceptable range.

A

Pad

209
Q

Used in an amplifier to compensate for the unequal loss of signal due to frequency.

A

Equalizer

210
Q

Converts AC power to DC in an amp.

A

Power Pack

211
Q

A design where the loss of the cable and all of the passives after an amp is equal to the gain of the amp.

A

Unity Gain

212
Q

List all the factors of attenuation in coaxial cable.

A

Frequency, Center Conductor size and material, Sheath Material, Dielectric Material, Spacing between Center Conductor and shield, Temperature

213
Q

This Map depicts the pole locations and pedestal locations and all the lengths in between.

A

Strand Map

214
Q

This map displays the locations of all equipment, including the headend and hubs as well as amps, power supplies, and taps.

A

Design Map

215
Q

Displays any corrections or changes to the original design, or as the result of a “walk out”.

A

As-Built Map

216
Q

Displays the optical transmitters, nodes, fiber footages, of the optical network.

A

Fiber Map

217
Q

Two main types of coaxial cable

A

P-series, and QR (Quantum Reach)

218
Q

Three types of loss in a device

A

Insertion loss, Isolation Loss, Return Loss

219
Q

Effect of the structure of the coaxial cable in signals.

A

Structural Return Loss

220
Q

Impedance of coaxial cable used by Comcast.

A

75 ohms

221
Q

Attenuation per 100 ft. at 750 MHz for .500 P-Series cable

A

2.17 dB per 100 ft.

222
Q

Attenuation per 100 ft. at 750 MHz for .625 P-Series cable

A

1.78 dB per 100 ft.

223
Q

Attenuation per 100 ft. at 750 MHz for .750 P-Series cable

A

1.53 dB per 100 ft.

224
Q

Attenuation per 100 ft. at 750 MHz for .875 P-Series cable

A

1.36 dB per 100 ft.

225
Q

Attenuation per 100 ft. at 750 MHz for 1.000 P-Series cable

A

1.23 dB per 100 ft.

226
Q

Formula for attenuation of ANY frequency, given a known attenuation at a single frequency.

A

Attenuation = Square root of (Any Freq/Known Freq) times the Attenuation of known frequency

227
Q

This information is required for proper operation of a TDR.

A

VoP (Velocity of Propagation) and Impedance (75 ohms)

228
Q

These devices require power to operate.

A

Actives

229
Q

These do not require power and always attenuate signal.

A

Passives.

230
Q

List all passives used in coaxial cable.

A

Taps, DC’s, Line Splitters, In Line EQ’s, In Line Conditioners, and Power Inserters

231
Q

Used to extract specific amounts of signal and connect to customers drops

A

Taps

232
Q

Passive signal splitting device with a minimal through loss and a specified tap loss

A

DC (Directional Coupler)

233
Q

Passive device that splits the signal into two or three output ports.

A

Line Splitter

234
Q

0dBmv equals what voltage at 75 ohms?

A

1 milivolt across 75 ohms or 1000 microvolts across 75 ohms

235
Q

1mv across 75 ohms equals what dBmv?

A

0 dbmv

236
Q

Passive device available in several values, contains an EQ, Diplex, and Power passing choke

A

In Line EQ

237
Q

Passive device containing fuses or shunts, and Low Pass filters

A

Power Inserter

238
Q

Formula for calculation of loss.

A

Total Loss = Cable loss + Passive Loss (Loss is always answered as positive dBmv, i.e. 10 dbMv loss)

239
Q

This device only uses IPv6 OR IPv4 addressing.

A

Single Stack Device (cable modem)

240
Q

This device uses both IPv6 and IPv4 addressing.

A

Dual Stack Device

241
Q

Defined as the electromotive force or pressure that causes electrons to flow in a circuit.

A

Voltage

242
Q

Defined as the flow of electrons through a conductor

A

Current

243
Q

Defined as the opposition of a material to the flow of electrons

A

Resistance

244
Q

The difference in voltage between two points.

A

Potential

245
Q

The direction of an electrical field in a radiated wave.

A

Polarity

246
Q

Electrical current in which the polarity is periodically reversed.

A

AC (Alternating Current)

247
Q

Name the four AC waveforms used in cable.

A

Sine Wave, Square Wave, Quazisquare Wave, and Sawtooth Wave.

248
Q

One complete wave is called what?

A

Cycle

249
Q

Number of cycles per second is called what?

A

Frequency

250
Q

This German physicist first produced radio waves.

A

Hertz (Heinrich Rudolph Hertz)

251
Q

Physical distance of a cycle.

A

Wavelength

252
Q

The amount of time of a cycle.

A

Period

253
Q

Peak value of a waveform.

A

Amplitude

254
Q

Defined as the position of the amplitude as related to time.

A

Phase

255
Q

Defined as Current over time.

A

Power

256
Q

Formula for calculating Watts of power

A

Current X Voltage

257
Q

Defined as the resistance per unit length given in ohms.

A

Loop Resistance

258
Q

InGaAs

A

Indium-Gallium-Arsenide

259
Q

Term used to describe a lead-acid or gel-cell battery that no longer has the ability to hold a charge

A

Sulfated

260
Q

ANSI standard for hard hats

A

Z-89

261
Q

ANSI standard for hot gloves

A

Z-87

262
Q

Connecting directly to earth or a device with negative potential equal to earth

A

Grounding

263
Q

Connecting to the grounded portion of an electrical system

A

Bonding

264
Q

All new power supply batteries are now this type.

A

Gel-Cell

265
Q

Term used to describe a transformer reducing the voltage

A

Step Down

266
Q

Term used to describe converting DC voltage to AC voltage

A

Inverted

267
Q

Allows only higher frequency RF to pass

A

High Pass Filter

268
Q

Allows only the lower frequency signal, such as AC power, to pass.

A

Low Pass Filter

269
Q

Term used to describe the surge protection included in most power inserters.

A

Amp Clamp

270
Q

Design where multiple power supplies are distributed within a node.

A

Distributed Power

271
Q

This company is contracted to handle all HAZMAT in the field.

A

3E

272
Q

The exponent, or power, to which a number must be raised to produce a given number

A

Logarithm

273
Q

Formula for C/N in dB

A

C/N in dB = 10xlog(carrier level in dB/noise floor in dB)

274
Q

Formula for C/N in microvolts

A

C/N in mv = 20xlog(signal voltage/noise floor voltage)

275
Q

1 volt equals how many dBmv?

A

60 dBmv

276
Q

Discontinuous signal who’s various states are discrete intervals apart.

A

Digital Signal

277
Q

Device used to convert an analog signal to a digital signal.

A

Digitizer

278
Q

Number of bits per second

A

Bit Rate

279
Q

Number of changed digital states per second.

A

Baud (not baud rate)

280
Q

Continuous signal or carrier that varies in amplitude or frequency as a function of the changes at its input.

A

Analog Signal

281
Q

The process of converting analog signal to digital.

A

Analog to Digital Conversion (ADC)

282
Q

Three steps of analog to digital conversion are?

A

Sampling, Quantization, Encoding

283
Q

Analog audio carrier is how far from the analog video carrier?

A

3.5 MHz

284
Q

Modulation scheme where the amplitude is varied according to the value of the signal.

A

Amplitude Modulation

285
Q

Modulation scheme where the frequency is varied according to the value of the signal.

A

Frequency Modulation

286
Q

List the five most common modulation schemes used in cable.

A

ASK FSK PSK QPSK QAM

287
Q

Modulation of the Pathtrak telemetry frequency.

A

FSK

288
Q

Unwanted outside RF signals entering the coaxial cable network.

A

Ingress

289
Q

Unwanted sum and or difference in the signatures of frequencies resulting from the mixing of signals.

A

Beat

290
Q

Carrier to beat ratio of ______ is considered to be negligible.

A

57dB (NOT dBmv) (Assume analog unless specified as digital)

291
Q

Return path impairment characterized by the significant elevation of the noise floor.

A

CPD Common Path Distortion

292
Q

Chemical change caused by a reaction with oxygen, such as rust.

A

Oxidation

293
Q

A component signature of a single signal that is an integer multiple of the frequency.

A

Harmonics

294
Q

Caused by the random activity of the atoms that make up any part of a circuit at any temperature above absolute zero.

A

Thermal Noise

295
Q

Noise added to the return path due to the lack of or improper termination.

A

Termination Noise

296
Q

Baseline C/N value for thermal noise in analog calculations where the bandwidth is 6 MHz.

A

-59.2 dBmv

297
Q

Baseline C/N value for thermal noise in a digital QAM carrier

A

-31.73 dBmv

298
Q

This is defined as the noise added to the signal by the design of the amplifier, specified by manufacturer.

A

Noise Figure

299
Q

If the input level of an amp equals the noise figure of the amp, what is the output C/N?

A

59.2 dB (NOT dBmv)

300
Q

If the input level of an amp is 5 dBmv above the noise figure of the amp, what is the output C/N?

A

64.2 dB (59.2+5)

301
Q

If the input C/N of the first amp in an 8 like-amp cascade is 60.03 dB, what is the output C/N from the last amp?

A

51 dB (60.03 - 3.01 - 3.01 - 3.01)

302
Q

This term specifically describes the carrier to noise of digital carriers.

A

Carrier to Composite Noise

303
Q

List the five types of signal distortions in cable.

A

DSO (Discrete Second Order) CSO (Composite Second Order) DTO (discrete Third Order) CTB (Composite Triple Beats) and XMOD (Cross Mod)

304
Q

This distortion is twice the frequencies of two carriers plus and minus the frequencies of both carriers.

A

DSO (Discrete Second Order)

305
Q

This distortion manifests itself as a vertical bar in an analog picture.

A

XMOD (Cross Mod)

306
Q

This distortion manifests itself as a horizontal bar in an analog picture.

A

Hum Bar

307
Q

Acceptable carrier to hum ratio according to Comcast standards

A

2%

308
Q

Acceptable carrier to hum ratio according to FCC standards

A

3%

309
Q

Measurement of the desired signal vector point to the root mean square of the actual landing point.

A

MER (Modulation Error Ratio)

310
Q

Measurement of the signal power versus the error power

A

MER (Modulation Error Ratio)

311
Q

Defined as a function of the transit time across a circuit.

A

Group Delay

312
Q

This reveals every physical error in the network that influences transmitted signals.

A

Sweep Trace

313
Q

Two basic types of RF TDR.

A

Waveform TDR and Digital TDR

314
Q

Span of cable at the beginning of a TDR trace caused by the time lag of the pulse width.

A

Dead Zone

315
Q

Used to test for the presence of invisible light on a fiber optic cable.

A

Photosensitive Card

316
Q

ANSI standard that categorizes LASERs into various classes.

A

Z-136

317
Q

Method used to deactivate and mark one end of a line in order to allow safe work at the other end of the line.

A

Lock Out Tag Out

318
Q

Transportation of multiple wavelengths of light through a single mode fiber.

A

WDM Wave Division Multiplexing

319
Q

Transportation of over 32 different wavelengths of light in a single mode fiber.

A

DWDM Dense Wave Division Multiplexing

320
Q

Three basic parts of an optical link

A

Transmitter, Medium (fiber), and Receiver

321
Q

Three types of optical transmitters.

A

FP, DFB, and YAG (Fabrey-Perot, Distributed Feedback, and Yttrium Aluminum Garnet)

322
Q

Network architecture where each endpoint is connected with a single link.

A

Star Network

323
Q

Network where every workstation is connected through a common path and all data must flow through every station.

A

Bus Network

324
Q

Network where data is passed around until it reaches the correct workstation.

A

Ring Network

325
Q

Two types of digital transport.

A

Asynchronous and Synchronous

326
Q

Three parts of a packet.

A

Header, Payload, Trailer

327
Q

Visible light

A

390nm to 780nm

328
Q

The loss of power between the optical transmitter and the optical receiver.

A

Loss Budget

329
Q

Formula for conversion of dB to mW

A

mW = 10 raised to the power of (dB/10)

330
Q

FCC requires POP tests how often?

A

Color performance test every three years, all other POP tests twice a year.

331
Q

Visible light in terahertz (THz)

A

384 to 769 THz

332
Q

Two types of fusion splicers.

A

LID (Local Injection and Detection) and Profile alignment

333
Q

Two types of optical splices.

A

Fusion and mechanical

334
Q

List the steps for splicing in order.

A

Prepare the cable, Prepare the enclosure, Route the fiber, Clean and Cleave, Splice and Protect, Seal the enclosure.

335
Q

Three types of fiber connectors.

A

UPC, APC, LCSC

336
Q

Ohm’s Law

A

E=IxR

337
Q

TDMA

A

Time Division Multiple Access

338
Q

ATDMA

A

Advanced Time Division Multiple Access

339
Q

SSID

A

Service Set Identifier

340
Q

TCP/IP

A

Transmission Control Protocol/ Internet Protocol

341
Q

UDP

A

Universal Datagram Protocol

342
Q

OSI

A

Open Systems Interconnection (model)

343
Q

LTE

A

Long Term Evolution

344
Q

ALS

A

Automatic Level and Slope

345
Q

AGC

A

Automatic Gain Control

346
Q

ADU

A

Automatic Driver Unit

347
Q

OMI

A

Optical Modulation Index

348
Q

LASER

A

Light Amplification by StimulatED Emission of Radiation

349
Q

ANSI

A

American National Standards Institute

350
Q

FTTF

A

Fiber To The Feeder

351
Q

FTTC

A

Fiber To The Curb

352
Q

FTTH

A

Fiber To The Home

353
Q

LAN

A

Local Area Network

354
Q

MAN

A

Metropolitan Area Network

355
Q

WAN

A

Wide Area Network

356
Q

CRAN

A

Converged Regional Area Network

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