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NCS Certification > Entry Exam > Flashcards

Entry Exam Flashcards

1
Q

Which statement regarding NEXT is true?

A

Crosstalk is greatest at the near end (at the sender end)

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2
Q

What type of hard hat is recommended for Construction work?

A

Class E, Type 2

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3
Q

According to the TIA-569-D standard, what is the maximum length of conduit allowed between pull points in a horizontal cable system?

A

30 meters/100 feet

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4
Q

What must be done in order to operate a fusion splicer below 0 degrees?

A

Warm the splicing area

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5
Q

When testing cable, what does an asterisk (*) beside the NEXT value indicate?

A

The NEXT value is marginal

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6
Q

What size is the PBB (TMGB)?

A

0.25” x 4” x variable length

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7
Q

When viewed from the front of the patch panel, how are the WA cables routed on a two row 48-port hinged patch panel, that hinges towards the left?

A

All 48 cables are routed to the left side of the patch panel

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8
Q

What is the minimum diameter sheave (pulley) that is required for a 900 pair cable, 2.75” in diameter, if the bend radius for a multipair in 10 x OD?

A

55 inches

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9
Q

According to ANSI-568.0-D standard, what is the maximum installation pull/tensile load for a 4-pair cable?

A

25 lbf.

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10
Q

According to the TIA-569-D standard, what is the maximum number of 90º bends that may be placed between pull points of a horizontal conduit system?

A

2

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11
Q

Which of the jack pin/pair assignments is backward compatible with 2-pair USOC configuration?

A

T568A

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12
Q

Which firestopping material should be used to seal a round opening in a concrete wall?

A

Intumescent foam

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13
Q

A 100BASE-TX switch uses two 25-pair cables to connect to a patch panel. What is the minimum number of patch panel jacks needed to terminate the two cables?

A
  1. 12 for each cable
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14
Q

If a patch panel is 4 Us high, how much space in inches will it take up on the rack?

A

7 inches

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15
Q

What size of mechanical splice devices are required to splice a loose tube cable to a breakout cable?

A

250 µm - 900 µm

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16
Q

What is the minimum number of BBC’s (a.k.a., ground equalizer [GE]) required in a ten story building with two TRs per floor?

A

4

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17
Q

Which type of network topology require a central device?

A

Star topology

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18
Q

According to ANSI-568-C.2 standard, which of the following is a required certification field-test parameter?

A

Return Loss

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19
Q

Which firestopping material should not be used to seal a round opening in a concrete wall?

A

Self leveling caulk

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20
Q

A hybrid optical fiber loose-tube cable, with 6 strands per tube, has 24 SM strands in the first series of tubes. What are the colours of the strand and the tube of the MM fiber strand 18?

A

Red tube, white strand

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21
Q

An analog CCTV system is to be converted to digital. What infrastructure equipment is required to allow the use of some existing analog cameras?

A

A PoE Ethernet switch connected to a PoE powered video encoder

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22
Q

A bundle of cables in a TR are not labelled. What tool is used to identify the cables?

A

Toner/wand

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23
Q

When viewed from the front of the patch panel, how are the WA cables routed on a two row 48-port hinged patch panel, that hinges towards the left?

A

All 48 cables are routed to the left side of the patch panel

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24
Q

What is the nominal impedance of RG-58 (Series-58) cable?

A

50 Ω

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25
Q

A hybrid optical fiber loose-tube cable, with 6 strands per tube, has 24 SM strands in the first series of tubes. What are the colours of the strand and the tube of MM strand 24?

A

Black tube, white strand

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26
Q

What is done after fusing two fibers together?

A

Install splice protector

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27
Q

What instrument is required to measure the length of a coaxial cable?

A

Time domain reflectometer

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28
Q

What equipment is needed to find a defective fiber connector?

A

Visual fault locator

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29
Q

What is insertion loss?

A

Insertion loss is the same as attenuation

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30
Q

What is the allowable ampacity for a 24 awg, 75 ºC, 8 conductor Class 2 power and Data circuit, when using only 4 conductors and bundled with 1 other cable?

A

1.96 A

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31
Q

Which wire map test cannot be done with a basic continuity-type tester?

A

Split pairs

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32
Q

According to the ANSI-568.3-D standard, what is the identifying colour of a single mode optical fiber SC connectors?

A

Blue

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33
Q

When certifying a Cat. 6A direct attached link, or a.k.a., modular plug termination link (MPTL). How is the certifying equipment configured?

A

A link adapter at one end and a patch cord adapter at the other end

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34
Q

What equipment is needed to find an active fiber strand?

A

Fiber identifier

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35
Q

How many sheets of plywood are required in a TR located on an 80,000 ft² floor space, where the ratio of floor area to plywood is 75:1?

A

34 sheets

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36
Q

A 600-pair OSP feeder cable is terminated in a branch splice enclosure to two 300-pair OSP distribution cables. What is the minimum number of 25-pair straight connector modules for this enclosure?

A

24 modules

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37
Q

According to the TIA-569-D standard, what is the maximum allowable distance between non-continuous cable supports such as “J” hooks?

A

5 ft

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38
Q

Which one of the TIA standards would you refer to for information about the grounding and bonding requirements for telecommunications?

A

TIA-607

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39
Q

What is tested with a tier 2 optical fiber test?

A

Attenuation of cable elements

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40
Q

A fiber link indicates a loss of 10 dBm. How much light power is being received at the receiver?

A

100 µW

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41
Q

According to the TIA-569-D standard, what is the maximum length of conduit allowed between pull points in a horizontal cable system?

A

30 meters

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42
Q

When pulling a multi-pair cable, what is done to eliminate twisting?

A

Pull cable with a swivel

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43
Q

What is the colour sequence for a modular plug configured for T568B?

A

W-Orange, Orange-W, W-Green, Blue-W, W-Blue, Green-W, W-Brown, Brown-W

44
Q

How much shorter will the maximum permanent link length be when using 28 AWG ‘small conductor” cords with a derating factor of 92%?

A

82.8 meters
90 meters X 92% = 82.8 meters

45
Q

What type of backbone cabling configuration scheme is outlined in the TIA-568.0-D standard?

A

Star

46
Q

What must be done in order to operate a fusion splicer below 0 degrees?

A

Warm the splicing area

47
Q

According to the ANSI-568.0-D standard, what is the minimum bend radius for a 4-pair UTP?

A

4 times diameter

48
Q

What will happen to channel attenuation when a 62.5 µm fiber patch cord is connected to a 50 µm fiber?

A

Attenuation will be higher when the source is connected to the 62.5 µm fiber

49
Q

Which property of firestopping material causes it to absorb heat?

A

Endothermic

50
Q

Which combination of UTP performance characteristics requires that “length” is part of the specifications (e.g. 28.7 ohms/1000 ft.)?

A

DC resistance, insertion loss, and capacitance

51
Q

What is measured when testing fiber loss?

A

A difference ratio in power

52
Q

When testing cable, what does a pass with an asterisk (*) indicate?

A

The test result is closer to the test limit than the measurement accuracy of the tester, but the cable does achieve an overall pass.

53
Q

What is the logical sequence of tests to find faults on an active fiber channel?

A

Check link lights, fiber continuity, power meter & light source, OTDR

54
Q

Which is correct definition of a split pair?

A

A split pair is a transposition of two conductors of separate pairs

55
Q

Which type of network topology uses a terminator?

A

Bus topology

56
Q

How must a ground bus be installed?

A

Mounted on insulators, spaced 2” from the mounting surface

57
Q

Which of the following represents the abbreviation “Gb/s” ?

A

Gigabit per second

58
Q

an OSP cable connecting two buildings has the following colours identifying the last pair.
Black superbinder
Violet-brown binders
Violet-slate pair
What is the minimum number of 250-pair terminal blocks and the minimum number of 25-pair connector blocks required to terminate both ends of this cable?

A

16 terminal blocks and 144 connector blocks

59
Q

hich of the following cable pulling lubricants provide the lowest pulling tension?

A

Silicone based

60
Q

Installed on a CEA-310-E compliant 19” rack is the following equipment:
3(three) - Horizontal cable management panels, 19” x 1-3/4”
2(two) - Switch, 19” x 5-1/4”
2(two) - Modular pacth panels, 19” x 3-1/2”
How many rack units does all this equipment occupy?

A

13 rack units

61
Q

A 1900 m link of singlemode outdoor fiber operating at 1310 nm has 2 mechanical splices and 2 mated connectors. The component losses are as follows:
Fiber loss = 0.5 dB/km
Splice loss = 0.3 dB
Mated pair connector loss = 0.75 dB
What is the total loss of this link?

A

3.05 dB

62
Q

Which cable type has the equivalent fire rating of FT6?

A

CMP

63
Q

According to the TIA-568-B.3 standard, what is the attenuation specification for one optical fiber splice?

A

0.30 dB

64
Q

What is the relationship between wavelength and frequency?

A

Frequency is inversely proportional to wavelength

65
Q

What are two popular sizes of rack mounting screws?

A

10-32 and 12-24

66
Q

What equipment is required to bend a 4” rigid conduit?

A

Hydraulic pipe bender

67
Q

According to the ANSI-568.3-D standard, what is the identifying colour of a 62.5/125 µm mulimode optical fiber SC connector?

A

Beige

68
Q

According to the TIA-568-B.3 standard, what is the attenuation specification for one mated optical fiber connector pair?

A

0.75 dB

69
Q

What section in the CEC would you find the rules for Conductors for a Class 2 power and Data Circuits?

A

Section 16

70
Q

What equipment is needed to find the length of optical fiber on a reel?

A

OTDR

71
Q

What is the maximum amount of cable jacket that may be removed when terminating Category 6 cable?

A

Only as much as necessary to terminate

72
Q

Which verification test result would result in an inaccurate, if the NVP was not set correctly?

A

Length

73
Q

Which connector uses IDC termination technology?

A

110 connector

74
Q

How is a direct attached link, a.k.a., modular plug termination link (MPTL) terminated?

A

A jack in the field and a plug at the HC

75
Q

What instrument is required to measure return loss per connection in an optical fiber link?

A

An optical TDR measurement unit

76
Q

What type of splice method is used if future rearrangement and maintenance is needed?

A

Foldback splice

77
Q

What value of dB represents a doubling of power?

A

3 dB

78
Q

A 850 m link of multimode fiber operating at 850 nm has 1 mechanical splice and 2 mated pair connectors. The component losses are as follows:
Fiber loss - 3.5 dB/km
Splice loss - 0.3 dB
Mated pair connector loss - 0.75 dB

A

4.78 dB

79
Q

What size is the PBB (TMGB)?

A

0.25” x 4” x variable length

80
Q

When testing cable, what does an asterisk (*) beside the NEXT value indicate?

A

The NEXT value is marginal

81
Q

Which statement is correct regarding jack/plug configuration as per ANSI-568.0-D standard?

A

T568B is optional and T568A is standard

82
Q

What equipment is needed to find the length of copper cable on a reel?

A

Time domain reflectometer

83
Q

According to the TIA-568.0-D standard, what is the maximum amount of conductor untwist for a Cat.3 cable?

A

3 inches

84
Q

Which property of firestopping material causes it to develop a hard char when heated?

A

Ablative

85
Q

According to the ANSI-568.3-D standard, what is the identifying colour of a laser optimized optical fiber SC connector?

A

Aqua

86
Q

According to the ANSI-568.3-D standard, what is the identifying colour of a APC optical fiber SC connector?

A

Green

87
Q

How is the position of fiber number 1 identified on an MPO connector?

A

The number one fiber is identified with a paint mark

88
Q

How is an outdoor wireless access point (WAP) connected in a location where there are no nearby AC power outlets?

A

Connect the WAP to a non PoE capable switch using a midspan device

89
Q

What is the minimum diameter sheave (pulley) that is required for a 900 pair cable, 2.75” in diameter, if the bend radius for a multipair in 10 x OD?

A

55 inches

90
Q

Given the distances of cabling need for the workstations below. How many boxes of cable are required to cable this floor section with 2 cables per workstation, including an allowance of 10% on each end?

A

7

90
Q

When plugging an MPO cord into active equipment (transceivers), what is the gender of the connector?

A

The cord connector needs to be female

91
Q

What size is the SBB (TGB)?

A

0.25” x 2” x variable length

92
Q

A PoE powered WAP is relocated beyond the reach of UTP cabling. What is needed to extend the reach?

A

Connect the WAP with UTP to a PoE powered UTP/fiber media converter

93
Q

Which property of firestopping material causes it to expand when heated?

A

Intumescent

94
Q

During the inspection of the fiber with a microscope, which one of the following finishes, though not perfect, may still be acceptable?

A

Minor scratches in cladding

95
Q

According to ANSI/TIA-568.3-D, which statement is correct regarding Tier 2 optical fiber testing?

A

Tier 2 testing is done after Tier 1 testing

96
Q

Which non-mechanical firestopping material should be used to temporarily seal an opening in a building?

A

Pre-manufactured pillows

97
Q

According to the TIA-569-D standard, what is the minimum vertical clearance required between a ladder rack in a ceiling and the ceiling tiles?

A

3 inches

98
Q

What splice method should be used on multipair cables, where the splices need to be maintained?

A

Fold back splice

99
Q

What are the sequences of steps used to troubleshoot a MM fiber connected to an active Ethernet hub?

A

Clean fiber connectors and check link lights

100
Q

When testing NEXT, what does “worst case margin” indicate?

A

The point (frequency) where NEXT test result is closest to the test limit

101
Q

An EF is located 20 meters from the exterior edge of a building. How many meters of non-FT rated outdoor fiber cable be installed into the EF?

A

In 17 meters of rigid conduit

102
Q

How is a “Type-B’ MPO cable configured?

A

The fiber from position 1 goes to position 12 at the other end

103
Q

How is a “Type-A’ MPO cable configured?

A

The fiber from position 1 goes to position 1 at the other end

104
Q

In a patch cord, what is the alternate colour of pair #1?

A

Green-Red

105
Q

According to the ANSI-568.3-D standard, how is a MM SC connector differentiated from a SM SC connector?

A

The MM connector is colour-coded beige and the SM connector is colour-coded blue

NCS Certification (10 decks)

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