Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Low Voltage Year 2 > Test 4 - Structured cable > Flashcards

Test 4 - Structured cable Flashcards

1
Q

Who establishes the flame rating for cables?

A

NEC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

floor pathways

A

underfloor duct
cellular floor
raised floor
underfloor conduit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Who develops procedures for testing cables?

A

UL - Underwriter laboratories

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

near end cross talk causes

A

poor termination

untwist pairs to much at termination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Where a telecommunications conduit is to be terminated in a device exposed to weather, care shall be taken to prevent the ___.

A

Ingress of moisture.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When a pair of wires is twisted, each of the wires will have nearly identical ___ with respect to ground. This results in almost no difference in the levels of ___ between the two wires

A

Electrical characteristics, induced voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

___ protection is provided either by heat coils or fuses.

A

over current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The performance requirements for Class F^ cables, connectors, basic links and channels are specified at frequencies between ___ Mhz.

A

600 to 1000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The two types of underfloor ducts are:

A

Single level, Two level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

___ is the ratio of the worst-case attenuation of pairs in a cable to the worst-case pair-to-pair NEXT.

A

Attention to crosstalk ratio (ACR)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

830

A

multimedia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

primary and secondary in CAT

A

tip - primary

ring - secondary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The performance testing requirements for Category 5 cables, connectors, basic links and achannels are specified at frequencies up to ___ Mhz.

A

100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The two conductors of a twisted pair are normally referred to as the ___ and the ___?

A

Ring conductor, Tip conductor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

___ is the undesired coupling of signal energy from a transmitting pair into a receiving pair.

A

crosstalk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Fiber bandwidth ___ (can/cannot) be adversely affected by installation procedures.

A

Cannot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Category 5e cables exhibit ___ insertion loss than Category 3 cables.

A

lower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

For 8-pin modular outlets, ____ is expressed in terms of worst case pair to pair crosstalk.

A

NEXT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

For a given cable, as frequency increases, NEXT ___ (increases/decreases).

A

decreases.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

For a given 8-pin modular outlet, as frequency increases, NEXT ___

A

Decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

TIA standard methods for terminating twisted pair cables on 8-pin modular outlets

A

568a

568b

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

The performance requirement fo Category 3 cables, connectors, basic links, and channels are specified at frequencies up to ___ Mhz.

A

16

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A plaster or drywall ceiling or other inaccessible areas ___ be used as distribution pathways.

A

shall not

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Modular patch panels are popular for

A

data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

___ inserts are factory-installed while ___ inserts are field-installed. All inserts should be ___ when service fittings are removed.

A

Preset, after set and capped.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

___ is a measure of how much a signal is reduced in amplitude or strenth as it is carried over a twisted pair or fiber.

A

Insertion loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Multi-conductor cables are ___?

A

for application dependent cabling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What kind of firestops incorporate metal frames containing elastomeric modules fitted to the cables with some method of applying compression to the assembly?

A

Mechanical firestops

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

___ is the undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair.

A

Power sum, attention to crosstalk ratio, far end

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Popular coaxial fittings include the ___-type(used extensively for cable TV), the ___-type(used in most data coaxial applications), and the ___-type(used for thick Ethernet).

A

F, BNC and N.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

A(n) ___ or ___ shall be placed in installed conduits.

A

Pull string, rope

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

In computer and equipment rooms, a floor system with modular panels supported by pedestals, with or without stringers, in called a(n) ___.

A

Access floor / Raised floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

A(n) ___ is typically installed at each end of a UTP backbone cable which has a corrugated aluminum shield over the core for the purpose of grounding the cable.

A

Bonding Clamp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Define delay skew.

A

Delay skew is the difference in the delay time for each of the pairs in a 4-pair cable.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

By allowing each of the pairs in a twisted pair cable to have a different twist lenth, the degree of ___ is reduced.

A

Pair to pair capacitive coupling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

___ has cells that become the distribution raceways. There are two types: ___ and ___.

A

Cellular floor, Steel and Concrete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

By allowing each of the pairs in a twisted pair cable to have a different twist length, the degree of ___ is reduced.

A

Pair to pair copacitive coupling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

The performance testing requirements for Category 6e cables, connectors, basic links and channels are specified ast frequencies up to ___ Mhz.

A

350-550

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Overvoltage protectors for use on UTP cables are designed to provide a(n) ___ path to ground.

A

low resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

List some guidelines that should be followed in general, but especially for Category 5e installations.

A

Do not untwist pairs. Remove as little jacket as necessary.

never bend kink or flatten

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Return Loss is measured in ___, with a higher number meaning a better cable.

A

DB

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Patch cords are primarily used for cross-connecting circuits in ___ environments.

A

data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Conduit shall be ___ to eliminate sharp edges and terminated with a(n) ___.

A

reared, insulated bushing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

___ is the ration of the worst-case attenuation of pairs in a cable to the worst-case pair-to-pair NEXT.

A

attenuation to crosstalk ratio (ACR).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Parameters used for defining the performance of cables and cpmponents are specified using the ___ as a unit of measurement.

A

decibel (db)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

A typical 100-pair 110-type terminal block can accommodate the termination of a maximum of ___ 4-pair cables.

A

24

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

Type 1 cable constists of ___ twisted pairs, each individually shielded with ___, with a(n) ___ outer shield surrounding the entire cable core and covered with a jacket.

A

22, Foil and Braided.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

List the four inter-building pathways.

A

Underground, Buried, Aerial and tunnel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

A conduit of ___ minimum diameter shall be used to interconnect telecommunications rooms located on the same floor.

A

3”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

For a given twisted pair cable, as frequency increases, crosstalk performance ___.

A

decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Define the word plenum

A

a compartment or chamber to which one or more air ducts are connected which forms part of the air distribution system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

Conduit through the floor shall be terminated ___ above the floor surface.

A

1 to 3 inches.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

PSACRF

A

The undesired coupling of signal energy from a number of simultaneous-transmitting pairs into a receiving pair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

___ is the undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair, measured at the opposite end of the cable from where the transmitter is located.

A

PSACRF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

300 pair terminal block is ____ type

A

110

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

delay skew

A

the disparity in the propagation delay between any two pairs within the same cable. (shorter and longer pairs)

57
Q

With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:

Riser within an office building

A

CMR

58
Q

For 8-pin modular outlets, NEXT is expressed in terms of worst case ___ crosstalk.

A

Pair to Pair

59
Q

List the methods of fire stopping

A 
mechanical devices
putty
caulks
cementious mortars and grouts
sprays
intumescent wraps
pillows bags and blocks
silicon fomes
60
Q

___ is the reduction of optical power as it propagates through an optical fiber.

A

attenuation

61
Q

___ are pathways embedded in concrete for cables and wires for services such as telecommunications and elecrical.

A

Underfloor duct system

62
Q

when a pair of wires is not ttwisted, each of the wires will not have identical ___ with respect to ground. This results in ___ levels of induced noise voltage on each of the wires.

A

Electrical characteristics, different

63
Q

Horizontal cable length maximums

A

patch panel to jack 90 meters

patch cord 10 meters

64
Q

horizontal pathways in ceiling

A

home run
zone
raceway
pokethrough

65
Q

The NEC requires cables to pass a test for combustion toxicology in order to be listed for plenum use?

A

No it has to meet UL standards

66
Q

Define ACRF

A

Attention to crosstalk ratio Far end.

crosstalk loss which is the undesired signal coupling between adjacent pair at the far end or cabling or a component.

67
Q

A(n) ___ consists of up to 90 meters of horizontal cabling, a connection at each end, up to two meters of test equipment cord from the main unit of the field tester to the local connection, and up to two meters of test equipment cord from the remote connection to the remote unit of the field tester.

A

Permanent link test configuration

68
Q

In order to allow both telecommunications and power cables in a cable tray or cable runway, they must be ___, as required by the Electrical Code.

A

Divided with barrier to allow separation between the two.

69
Q

Telecommunications rooms shall be provided with the following (List 7 items):

A 
1 wall with 3/4 in plywood
no false ceiling
2 20 amp 120v outlets
36x80 in door access
access to outside GEC
painted light color to eliminate dust
50 foot candles 3 ft off the door
70
Q

List the types of cables recognized for use in a horizontal cabling system.

A

4 Pair 100 Ohm unshielded twisted pair.
4 Pair screened twisted pair. (SCTD)
2 Fiber mullti-mode optical fiber cable, either 32.5/125 or 50/125mm.
COAX

71
Q

With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:

Stud wall within an office building

A

CM

72
Q

When cables are placed above a ceiling and conduits or cable trays are not used, the cables shall have supports located on ___ center.

A

5 foot

73
Q

For a given cable, as frequency increases, attenuation ___

A

increases

74
Q

There are ___ pairs in each binder group of a multi-pair UTP backbone cable.

A

25

75
Q

For a given twisted pair cable, as frequency increases, attenuation ___.

A

increases.

76
Q

770

A

fiber

77
Q

A horizontal run of conduit can serve a maximum of ___ outlets.

A

3

78
Q

Equipment rooms shall be located away from ___, such as transformers, motors and generators.

A

electromagnetic interference

79
Q

With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:

residential basement

A

CMX

80
Q

return loss

A

the ratio of transmitted signal to the reflected signal of cabeling expressed in dB.

81
Q

The performance requirements for Category 6 cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.

A

250

82
Q

fiber connectors

A

st sc lc

83
Q

List five pathways and/or spaces recognized by the 569-B Standards for Single Tenant buildings.

A

Wireless service entrance pathway, Back bone pathway, Horizontal pathway, Tie pathway, Access provider space and Service provider space.

84
Q

Overvoltage protectors for use on UTP cables are designed to provide a(n) ___ path to ground.

A

low resistance

85
Q

A structured cabling system is a(n) ___?

A

cohesive way of organizing a cabling system.

86
Q

The bandwidth of a multi-mode fiber is expressed in ___.

A

MHz per KM

87
Q

Backbone pathways shall not be located in ___.

A

Elevator shaft.

88
Q

Which type of overvoltage protection operates faster than conventional protectors, provides balanced operation and is more reliable than conventional protectors units?

A

Solid State

89
Q

___ set the minimum requirements for installing conduit.

A

Appropriate electrical code.

90
Q

Define propagation delay

A

Propagation delay is the length of time it takes for a signal to travel to its destination.

91
Q

66 block how many cables

A

12 4 pair cables

92
Q

For a given outlet, as frequency increses, attenuation ___.

A

Increase

93
Q

NEXT is the undesired coupling of energy from the ___ pair into the ___ pair.

A

Transmitting conductor pair, receiving conductor pair.

94
Q

Return Loss is measured in DB with a higher number meaning a ___ cable.

A

better

95
Q

With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:

Plenum of an office building

A

CMP

96
Q

List some uses for multi conductor cable

A 
A syncronous data terminal.
Electronic access control system.
Fire alarms.
Security systems.
Environmental controls.
Nurse call systems.
97
Q

Power and telecommunications cables installed in tray shall be installed per the ___.

A

NEC

98
Q

___ conduit is not recommended because of cable abrasion problems and the length should be less than ___.

A

Flex and 20’.

99
Q

The minimum bend radius, under no-load conditions, for a 4-pair UTP cable shall be ___ times the cable diameter.

A

4

100
Q

Within a 300 pair UTP backbone cable, there are ___ binder groups. Show work.

A

300/25=14 binders

101
Q

In high-speed data environments, connections among terminal blocks, patch panels and equipment ports is usually accomplished with ___.

A

UTP patch cords

102
Q

In horizontal cabling, bridged taps are ___

A

Not allowed

103
Q

A problem with traditional carbon block protectors is that a build-up of carbon dust can cause a(n) ___ for the conductor it is supposed to protect.

A

path to ground

104
Q

___ cables are used in vertical passages connecting one floor to another

A

Riser

105
Q

___ is a measurement of the amount of signal energy that is reflected back to a transmitter as it travels down a twisted pair, encountering impedance discontinuities.

A

Return loss

106
Q

EO

A

equipment outlet

107
Q

List the three parts of a 110 block.

A

Mounting legs, wiring block and connecting block.

108
Q

800

A

telephone

109
Q

725

A

data transmission

110
Q

Category 5e outlets exhibit ___ attenuation than Category 3 outlets at 16 Mhz.

A

Lower

111
Q

___ boxes are intended to be used for splicing in addition to being used for pulling cable.

A

Splice

112
Q

What method of fire stopping should be considered when there is and area where cable activity occurs on a regular basis?

A

pillows

113
Q

What’s the purpose of fire stopping

A

prevent the spread of fire, smoke,water through a fire rated wall or floor. restore fire rating after penetration.

114
Q

What kind of cables can be used in office spaces to connect from a wall jack to a computer?

A

Communications General Purpose Cables

115
Q

820

A

cable tv

116
Q

8 pin to pair relationships

conductor color

568a

568b

A

white, blue, orange, green, brown

A
5, 4, 3, 6, 1, 2, 7, 8

B
5, 4, 1, 2, 3, 6, 7, 8

117
Q

110 block how many cables

A

24 4 pair cables

118
Q

A building owner wishes to have several telecommunications cables and some power cables direct buried between two buildings located on his property, separated by a distance of 130 feet. In which document will you look for safety requirements for this installation?

A

NEC safety manual

119
Q

The undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair is expressed in terms of ___.

A

Power sum attenuation to crosstalk ratio.

120
Q

For 1/2” to 2” conduit, the minimum bend radius shall be ___ times the diameter of the conduit. For conduit over 2” in diameter, the minimum bend radius shall ___ times the diameter of the circuit. For conduit containing fiber optic cables, the minimum bend radius shall be ___ times the dimeter of the conduit.

A

6, 10 and 10.

121
Q

Telecommunications systems, media and buildings are ___.

A

Dynamic

122
Q

Who publishes the NEC every three years?

A

NFPA - National fire protection association

123
Q

backbone cabeling

A

cable connecting hardware between telecommunication rooms, equipment rooms and entrance facilities

124
Q

Pull boxes ___ be used for splicing cables over 2.5” in diameter.

A

shall not

125
Q

The total opposition to alternating current flow of a twisted pair is called the ___?

A

Impedence

126
Q

A minimum of ___ of headroom shall be provided and maintained above a cable tray.

A

1 foot

127
Q

The performance requirements for Category 5e cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.

A

100

128
Q

760

A

fire alarm

129
Q

What connector is used most often in broadband data applications

A

F-Type

130
Q

For what is putty fire stopping ideal?

A

Providing and instant fire stop and retrofitting work in occupied areas.

131
Q

___ is the undesired coupling of signal energy from a transmitting pair into a receiving pair, measured at the opposite end of the cable from where the transmitter is located.

A

Power sum, attention to crosstalk ratio, for end

132
Q

No section of conduit shall be longer than ___ or contain more than ___ 90* bends between pull points or boxes.

A

100ft

2

133
Q

50 pair terminal block is ____ type

A

66

134
Q

The performance requirements for Category 6^ cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.

A

500

135
Q

Generally, the minimum finished floor height of an access floor is ___. However, when the area under the floor is used as a plenum for HVAC, such as in a controlled computer room, the minimum finished floor height should be ___.

A

6”, 12”

136
Q

A(n) ___ consists of up to 90 meters of horizontal cable, a work area equipment cord, a telecommuications outlet, an optional consolidation connection close to the work area, and two cross-connect connection in the telecommunications room

A

Channel test configuration

137
Q

What connector is used most often in closed circuit TV applications

A

BNC

138
Q

Header ducts in a cellular floor system are those ducts which connect the ___ to the ___.

A

Distribution cells, Telecom cells

139
Q

The TIA/EIA-569 Standard is a(n) ___ document. The standard is subject to ___ and ___ as warranted vy advances in building construction techniques and telecommunications technology.

A

Living, revision and updating.

Low Voltage Year 2 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions