Chapter 6 Flashcards
1
Q
AWG
A
American Wire Gauge
A system used to specify wire
size. The greater the wire
diameter, the smaller
the AWG value.
TDMM.* Page G-8
2
Q
Balanced Twisted-
Pair
A
A multi-conductor
communications cable
composed of two or more
copper conductors twisted in a
manner designed to cancel
electrical interference.
TDMM.* Page G-78
3
Q
Bandwidth
A
A range of frequencies available
for signaling expressed in hertz
(Hz). It is used to denote the
potential information handling
capacity of the medium, device,
or system.
TDMM.* Page G-18
4
Q
Cable
A
1 .An assembly of one or more
insulated conductors or optical
fibers within an enveloping
sheath that may be screened or
unscreened.
2. The act of installing
communications cable.
TDMM.* Page G-27
5
Q
Cable Assembly
A
A cable that has connectors
installed on one or both ends.
TDMM.* Page G-27
6
Q
Capacitance
A
1 . The ability of an electronic
component to store electrical
energy.
2. The opposition to a change in
voltage.
TDMM: Page G-30
7
Q
Chromatic Dispersion
A
A result of the phenomenon that
the velocity of propagation in a
medium is frequency dependent,
which causes the frequency
components of a pulse to lose
phase coherence as it
propagates (e.g., transmitted
pulse will spread out as it
propagates).
TDMM: Page G-36
8
Q
Coaxial Cable
A
A cable consisting of a central
metallic inner conductor
separated from an enclosing
outer conductor by a dielectric
material. This material may be
solid, foam, suitable gas, or dry
air. The outer conductor
comprises a metallic braid, a foil
layer, or a combination
of braid and foil.
TDMM.* Page G-39
9
Q
Conductance
A
The measure of the ease with
which electrical current flows
through a conductor. Uniformly
distributed along the conductor
length, conductance varies as a
function of a conductor’s geometry
and the dielectric properties of the
materials surrounding the
conductor. One of the primary
parameters for transmission lines.
The inverse of resistance. The unit
of measure is siemens (S).
TDMM.* Page G-44
10
Q
Connector
A
A mechanical device used to
provide a means for aligning,
attaching, and achieving
continuity between conductors
or optical fibers.
TDMM.* Page G-45
11
Q
Crosstalk
A
The unwanted transfer of signal
from one or more circuits to
other circuits as a result of
electromagnetic interference
TDMM.* Page G-50
12
Q
Delay Skew
A
The difference in propagation
delay between any two balanced
twisted-pairs within the same
cable sheath. (T IA)
Usually used in reference to the
delay between the balanced
twisted-pair with the highest and
the lowest signal propagation
delay value.
TDMM.* Page G-54
13
Q
Dispersion
A
1 . The loss of signal resulting from
the scattering of light pulses as
they are transmitted through a
medium.
2. The widening or spreading out of
the modes in a light pulse as it
progresses along an optical fiber.
3. The characteristics of the sound
coverage field of a speaker.
TDMM.* Page G-60
14
Q
EMI
A
Electromagnetic Interference
Radiated or conducted
electromaanetic energy that has
an undesirable effect on
electronic equipment or signal
transmissions.
TDMM.* Page G-67
15
Q
Inductance
A
1 . The property of an electrical
force field built around a
conductor when current flows
through it.
2. The resistance to change in
current.
TDMM.* Page G-95
16
Q
Inside Plant (ISP)
A
Inside Plant
Infrastructure
(telecommunications) systems
(e.g., balanced twisted-pair cabling,
optical fiber cabling, coaxial
cabling, racks, cabinets, cabling
pathways, information outlets)
inside a building.
Telecommunications companies
refer to this as inside wire (IW) or
intrafacility cabling (IFC).
TDMM.* Page G-98
17
Q
Modal Dispersion
A
A characteristic of transmission
in an optical fiber that results
from different lengths of the
light paths taken by the many
modes of light as they travel
down the fiber from source to
receiver. Also called modal
distortion.
TDMM.* Page G-122
18
Q
NVP
A
Nominal Velocity of Propagation
The coefficient used to determine
the speed of transmission along
a cable relative to the speed of
light in a vacuum, typically
expressed as a percentage. Also
called phase velocity and velocity
of propagation.
TDMM.* Page G-130
19
Q
OTDR
A
Optical Time Domain
Reflectometer
An instrument that measures
transmission characteristics of
optical fiber by measuring the
backscatter and reflection of
injected light as a function of time.
Used to measure attenuation of
optical fiber, splices, and
connectors and locate faults.
TDMM.* Page G-734
20
Q
Optical Fiber
A
A transmission media using a
thin filament of glass or plastic
use to transport pulse light
signals. Its bandwidth is higher
than copper and not subject to
electromagnetic interference
(EMI). The optical fiber consists
of a central core (glass or
plastic) and an outer cladding.
TDMM.* Page G-734
21
Q
OSP
A
Outside Plant
1 . Telecommunications
infrastructure designed for
installation exterior to buildings
and is typically routed into the
entrance facility. (T IA)
2.Communications infrastructure
outside of the buildings/premises
usina underaround conduits and
vaulfs, direct-buried cable, aerial
plants, and wireless.
TDMM.* Page G-135
22
Q
Plenum
A
The areas throughout the building,
compartment, or chamber to
which one or more air ducts are
connected, forming part of the air
distribution system.
TDMM.* Page 6-27
23
Q
Resistance
A
A measure of opposition a
material offers to the flow of direct
current. Measured in ohms.
TDMM: Page
24
Q
Riser
A
Any vertical service ducts
(shafts and chambers) and the
interfloor passages of the
building subject to the
cable installation.
TDMM.* Page 6-27
25
What are the components
of a cabling system?
Cables, equipment cords, patch
cords, and connecting hardware
components
TDMM.* Page 6-1
26
What is the difference
between an equipment
cord and a patch cord?
1 .Equipment cords attach
directly to active equipment
(e.g., network switch,
computer).
2.Patch cords are used to cross-
connect passive cabling
infrastructure (e.g., patch panel
to patch panel).
TDMM: Page 6-1
27
Name the 2 general
environmental styles of
balanced twisted-pair and
optical fiber cabling.
1 .Outside plant (OSP)
2. Premises (Inside plant [ISP])
TDMM.* Page 6-1
28
Which IEC standard
specifies an international
classification system for
the sealing effectiveness of
enclosures for electrical
equipment against
intrusion into the
equipment of foreign
bodies and moisture?
IEC 60529
TDMM.* Page 6-2
29
What term does ISO/IEC
use to describe channel
and link performance?
Class
TDMM.* Page 6-3, Table 6.1
30
What term does ISO/IEC
use to describe cable and
connecting hardware
performance?
Category
TDMM.* Page 6-3, Table 6.1
31
What term does TIA
use to describe
performance levels for
cabling and cabling
components?
Category
TDMM.* Page 6-3, Table 6.1
32
What is the minimum
acceptable performance
level for network cabling?
Category 5e/cIass D
TDMM.* Page 6-3
33
What does BICSI
recommend as the
minimum performance
level for horizontal
balanced twisted-pair
cabling?
Category 6A/class EA
TDMM.* Page 6-3
34
Per TIA standards, what is
the maximum frequency at
which category 3 cable
can operate?
16 MHz
TDMM.* Page 6-4, Table 6.2
35
Per TIA standards, what is
the maximum frequency at
which category 5e cable
can operate?
100 MHz
TDMM.* Page 6-4, Table 6.2
36
Per TIA standards, what is
the maximum frequency at
which category 6 cable
can operate?
250 MHz
TDMM.* Page 6-4, Table 6.2
37
Per TIA standards, what is
the maximum frequency at
which category 6A cable
can operate?
500 MHz
TDMM.* Page 6-4, Table 6.2
38
Per ISO standards, what is
the maximum frequency at
which category 7/class F
cable can operate?
600 MHz
TDMM.* Page 6-4, Table 6.2
39
Per ISO standards, what is
the maximum frequency at
which category 7A/class F
cable can operate?
1000 MHz
TDMM.* Page 6-4, Table 6.2
40
Per ISO standards, what is
the maximum frequency at
which category 8.1/class I
cable can operate?
2000 MHz
TDMM.* Page 6-4, Table 6.2
41
Per ISO standards, what is
the maximum frequency at
which category 8.2/class II
cable can operate?
2000 MHz
TDMM.* Page 6-4, Table 6.2
42
ISO/IEC uses an x/y
designation to describe
balanced twisted-pair
cables. What do the letters
represent?
*X = Overall screen type
*Y = Individual pair screen type
TDMM.* Page 6-4
43
True or False
The ANSI/TIA standards
provide clear cable design
designations.
False. The ANSI/TIA standards
do not provide clear cable
design designations.
TDMM.* Page 6-4
44
What are the 2 most
frequently used ANSI/TIA
cable designations?
UTP
ScTP
TDMM.* Page 6-4
45
True or False
Cable design designations
can be applied to connecting
hardware in the same manner
as cable.
False. Designations cannot be
applied in the same manner to
connecting hardware because of
significant design differences.
TDMM.* Page 6-4
46
How should connecting
hardware be referenced
in general?
As unscreened or screened.
UTP, STP, or FTP may be
appropriate as well.
TDMM.* Page 6-4
47
What is the characteristic
impedance of balanced
twisted-pair cable?
100 ohms (±15 ohms)
TDMM.* Page 6-7
48
What conductor sizes are
used for balanced twisted-
pair cable?
22 to 26 AWG
TDMM.* Page 6-7
49
Name 3 components found
in all balanced twisted-pair
cabling.
1 . Solid or stranded conductors
2. Thermoplastic insulation
3. Outer jacket or sheath
TDMM.* Page 6-8
50
How is efficient
insulation defined?
As material where any loss of
the transmitted signal because
of loss associated with the
insulation is minimal
TDMM: Page 6-8
51
Name 2 factors that affect
the mutual capacitance of
a balanced twisted-pair
cable.
1 . The conductor's insulating
material
2. The insulation's thickness
TDMM.* Page 6-9
52
What does permittivity
indicate?
Insulation's ability to transmit
(or permit) an electric field
TDMM.* Page 6-9
53
Name the 4 primary
parameters that control the
transmission performance
of a cable.
1 .Resistance (R)
2. Conductance (G)
3. Inductance (L)
4. Capacitance (C)
TDMM.* Page 6-10
54
Name 6 secondary
parameters that affect the
transmission performance
of a cable.
1.lnsertion loss
2.Crosstalk loss
3.Return loss (RL)
4.Propagation delay
5.Propagation delay skew
6.Nominal velocity of propagation (NVP)
TDMM.* Page 6-10
55
Name 4 mechanical
characteristics that may
influence transmission
performance.
1 . Tensile strength
2. Temperature rating
3.FlammabiIity rating
4.Environmental impact resistance
TDMM.* Page 6-10
56
True or False
Screened cables radiate less
electromagnetic energy than
unscreened cables.
True. Screened cables radiate
less electromagnetic energy
than unscreened cables.
TDMM.* Page 6-71
57
Name 2 common styles of
screening used in balanced
twisted-pair cables.
1.Foil
2.Braid
TDMM.* Page 6-11
58
Name 3 functions
performed by a cable
screen/shield.
1 .Reduces the level of the signal
radiated from the cable.
2.Minimizes the effect of
external EMI on the cable pairs.
3.Provides physical protection.
TDMM.* Page 6-11
59
Name 3 factors that
determine a screen's
effectiveness.
1. Material type
2. Thickness
3. Relative coverage
TDMM.* Page 6-11
60
What type of
electromagnetic field is
typically blocked by foil?
Higher frequency
(30 MHz and higher)
TDMM.* Page 6-11
61
What type of
electromagnetic field is
effectively blocked by
copper braid?
Lower frequency
(below 30 MHz)
TDMM.* Page 6-11
62
What type of
electromagnetic field is
effectively blocked by solid
metal tubing blocks?
Almost any electromagnetic fields
TDMM.* Page 6-71
63
What is the purpose of a
drain wire?
To drain the current
induced on the screen
TDMM.* Page 6-11
64
What type of screen provides
the highest level of protection
in an environment with
unusually strong effects from
relatively low-frequency EMI?
A combination of braid and foil
screens provides the highest
level of protection.
TDMM.* Page 6-12
65
What is the only type of
screen that is effective at
very low frequencies
(less than 1 kHz)?
Thick-wall metal conduit
TDMM.* Page 6-12
66
What type of screen is a
better choice in an
environment with unusually
strong effects from relatively
high-frequency EMI?
Foil screen
TDMM.* Page 6-12
67
True or False
Multipair screened cabling
is recognized for use in
horizontal and backbone
cabling applications.
False. Multipair screened cabling
is recognized for use in backbone
cabling applications only.
TDMM.* Page 6-12
68
Why do balanced twisted-
pair patch cords typically
have stranded conductors?
For added flexibility
TDMM.* Page 6-12
69
Balanced twisted-pair
patch cords that are
stranded may exhibit
_ percent to _ percent
more attenuation than
solid conductors.
Balanced twisted-pair patch cords
that are stranded may exhibit
20 percent to 50 percent
more attenuation than solid
conductors.
TDMM.* Page 6-12
70
What types of connectors
are typically used on the
ends of balanced twisted-
pair patch cords?
8-position, 8-contact (8P8C)
TDMM.* Page 6-12
71
What term is used to
describe cords that directly
attach to equipment on one
or both ends?
Equipment cord
TDMM.* Page 6-13
72
What term is used to
describe cords that attach
one set of connecting
hardware to another set of
connecting hardware to
form a cross-connection?
Patch cord
TDMM.* Page 6-13
73
Which type of patch cord, solid
or stranded conductor,
typically features better
insertion loss characteristics?
Solid
TDMM.* Page 6-13
74
Which type of patch cord, solid
or stranded conductor,
typically features better flex
life characteristics?
Stranded
TDMM: Page 6-13
75
What is the primary
difference between twisted-
pair and optical fiber cables?
Optical fiber uses pulses of light
to transmit signals whereas
balanced twisted-pair uses an
electron flow.
TDMM.* Page 6-74
76
Name the 2 classifications
of optical fiber cable.
1 .Singlemode
2.Multimode
TDMM.* Page 6-74
77
What is the core diameter
of a singlemode fiber?
8 to 11 um
TDMM.* Page 6-14
78
What is the approximate
cladding diameter of a
singlemode fiber?
125 um
TDMM.* Page 6-14
79
What are the common core
diameters for multimode
fibers?
50 um or 62.5 um
TDMM.* Page 6-74
80
What is the approximate
cladding diameter of a
multimode fiber?
125 um
TDMM.* Page 6-14
81
What 3 classification terms
are used to describe an
optical fiber cable?
1. Indoor/outdoor optical fiber
cable
2. Indoor optical fiber cable
3. Outdoor optical fiber cable
TDMM.* Page 6-76 .
82
What is the recommended use
for 62.5 um core fiber cable?
For extensions to existing
installations only
TDMM.* Page 6-16
83
What common wavelengths
are supported by multimode
optical fiber cable?
*850 nm VCSEL
*1300 nm LED
TDMM.* Page 6-76
84
What is the maximum distance
for running singlemode optical
fiber cable in structured
cabling systems?
3000m (9840 ft)
TDMM.* Page 6-17
85
What type of light source is
typically used with singlemode
optical fiber cable?
A laser light source
TDMM.* Page 6-17
86
What common wavelengths
are supported by singlemode
optical fiber cable?
1310 nm
1490 nm
1550 nm
1625 nm
TDMM.* Page 6-17
87
Name 3 causes of attenuation
in optical fiber cable.
1 .GIass material, impurities, and
point defects
2.Macrobends and microbends
in the fiber strands
3.Nuclear radiation (point
defects) (only in rare cases)
TDMM.* Page 6-17
88
Optical fiber attenuation is _____
proportional to length
Optical fiber attenuation is
directly proportional to length.
TDMM.* Page 6-17
89
What does the modal
bandwidth of multimode
optical fiber provide?
A measure of the amount of
information an optical fiber is
capable of transporting
TDMM.* Page 6-78
90
How is the modal
bandwidth of multimode
optical fiber defined?
As the frequency at which the
light pulse amplitude drops 3 dB
at an -1 km (0.625 mi) distance
TDMM.* Page 6-18
91
How will increasing the length
affect the information-carrying
capacity of an optical fiber
cable?
Increasing cable length will lower
the information-carrying capacity
of the optical fiber cable.
TDMM.* Page 6-78
92
Name the 2 components
that are used to determine
overall bandwidth.
1 .Modal dispersion
2.Chromatic dispersion
TDMM.* Page 6-78
93
From a practical point of
view, how is the bandwidth
of singlemode optical fiber
described?
As unlimited
TDMM.* Page 6-78
94
Where is loose-tube optical
fiber cable primarily used?
Outdoors
TDMM.* Page 6-19
95
What is the most common
diameter for a loose-tube
optical fiber cable?
250 um
TDMM.* Page 6-19
96
What are the 2 main
functions of a cable jacket
on an optical fiber cable?
1 .Physical protection for the
optical fibers in the cables
2.EnvironmentaI protection for
the optical fibers in the cable
TDMM.* Page 6-79
97
Name 3 advantages of
loose-tube optical fiber
cable compared to tight-
buffered cables with the
same number of strands.
1 .A greater tensile strength and
more robust outer jacket
2.A greater resistance to low-
temperature effects on
attenuation
3.A cable jacket that expands
and contracts with changes in
temperature without affecting
the optical fiber
TDMM.* Page 6-20
98
Where is tight-buffered optical
fiber cable primarily used?
Inside buildings
TDMM.* Page 6-21
99
What is the most common
diameter for tight-buffered
optical fiber cables?
900 um
TDMM: Page 6-21
100
How does a tight-buffered
cable protect the optical fiber?
By supporting each strand of
glass with a buffer coating
extruded over the base optical
fiber's 250-pm acrylate coating
TDMM.* Page 6-21
101
Name the 3 predominate
types of coaxial cable.
1. Series-6
2. Series-11
3. RG 59
TDMM: Page 6-24
102
What is the characteristic
impedance of Series-6
coaxial cable?
75 ohms
TDMM.* Page 6-24
103
True or False
The metallic covering on
a coaxial conductor acts
as a screen.
False. The metallic covering
is not a screen—it is a
conductor in the circuit.
TDMM.* Page 6-24
104
What type of conductor
does a Series-6 coaxial
cable have?
Solid-center conductor
TDMM.* Page 6-24
105
What types of connectors
are used with Series-6
coaxial cable?
*F-style connector
*BNC connector
TDMM.* Page 6-24
106
What type of coaxial cable is
used in video backbone
applications?
Series-11 U
TDMM.* Page 6-25
107
Why is Series-11U coaxial cable the preferred choice for longer runs?
It has lower signal attenuation than Series-6.
TDMM.* Page 6-25
108
What is the characteristic
impedance of Series-11 U
coaxial cable?
75 ohms
TDMM: Page 6-25
109
What type of conductor
does a Series-11 U coaxial
cable have?
18 AWG stranded center
conductor
TDMM.* Page 6-25
110
What types of connectors
are used with Series-11 U
coaxial cable?
* F-style connectors
* N-style connectors
TDMM.* Page 6-25
111
The longer the cable length,
the ___ the attenuation.
The longer the cable length,
the greater the attenuation.
TDMM.* Page 6-25
112
How does the outside
diameter of a coaxial cable
affect attenuation?
For a given dielectric, the larger
the cable's outside diameter, the
lower the attenuation.
TDMM.* Page 6-25
113
What factor determines how
often signal needs to be
amplified in the network?
Attenuation
TDMM.* Page 6-25
114
True or False
A coaxial cable may be
selected by simply identifying
the physical size (series).
False. A coaxial cable cannot be
selected by simply identifying
the physical size (series); a full
understanding of the application
is necessary.
TDMM.* Page 6-26
115
What designation is
currently used for
coaxial cables used in
broadband applications?
Series-X
TDMM: Page 6-26
116
Name 6 factors the ICT
designer should consider
when designing a broadband
distribution system.
1 .Amplifier link budgets
2.Amplifier cascade limitations
3.EnvironmentaI factors
4.Drop length
5.Minimum levels of the signal to the house
6.Price
TDMM.* Page 6-26
117
What term is applied to
define the areas throughout
the building, compartment,
or chamber to which one or
more air ducts are
connected, forming part of
the air distribution system?
Plenum
TDMM.* Page 6-27
118
Why are plenum areas the
most dangerous in terms
of fire safety?
Because they facilitate the fast
distribution of the flame and
combustion products (smoke
and gases) throughout
the building
TDMM.* Page 6-27
119
What term refers to any
vertical service ducts
(shafts and chambers) and
the interfloor passages of
the building subject to
cable installation?
Riser
TDMM.* Page 6-27
120
What locations are listed as
suitable for CMP cables?
Ducts, plenums, and other spaces
used for environmental air
TDMM.* Page 6-28
121
Why are CMR cables
required to have fire-
resistant qualities?
To prevent the carrying of fire
from floor to floor
TDMM.* Page 6-28
122
What locations are listed as
suitable for CMX cables?
Dwellings and raceways
TDMM.* Page 6-28
123
True or False
Type CMUC undercarpet
communications wires and
cables shall be listed as
being resistant to flame
spread.
True. Type CMUC undercarpet
communications wires and cables
shall be listed as being resistant to
flame spread.
TDMM.* Page 6-28
124
What types of cables have
an -LP designation?
Cables that are suitable for use in
high density POE applications
TDMM.* Page 6-28
125
What locations are listed as
suitable for OFNP and
OFCP cables?
Ducts, plenums, and other space
used for environmental air
TDMM.* Page 6-29
126
why are OFNR and OFCR
cables required to have fire-
resistant characteristics?
To prevent fire from spreading
from floor to floor
TDMM.* Page 6-29
127
Name the 2 fire safety
specifications that are
used in Europe.
*IEC 60332-1
*IEC 60332-3-24
TDMM.* Page 6-31
128
What term describes gas-
tight physical contact
between two conductors?
Insulation displacement contact
(IDC)
TDMM.* Page 6-33
129
What type of special tool is
typically required to create
an IDC connection?
Punch-down tool
TDMM.* Page 6-33
130
How is gas-tight contact
established in an IDC
connection?
By a cold weld and elimination
of the air gap between
the conductor and the IDC
TDMM.* Page 6-33
131
Name the 4 basic styles of
IDC connectors.
1.110-style
2.66-style
3.BIX-style
4. LSA-style
TDMM: Page 6-33
132
Name 4 reasons the 110-
style is the most popular
IDC connector.
1 . Compact design
2. Reliability
3. High transmission
performance capabilities
4. Relatively inexpensive to
manufacture
TDMM.* Page 6-33
133
How many termination
cycles can a 110-style IDC
connector complete before
its reliability degrades?
At least 200
TDMM.* Page 6-33
134
What is the disadvantage
of the 1 1 0-style IDC
connector?
It does not exist in screened
versions as a stand-alone
connector.
TDMM.* Page 6-35
135
Why has the 66-block, one
of the oldest industry
connectors, remained an
alternative for
telecommunications
applications?
Because of its high-density
termination design and simple
and inexpensive manufacturing
TDMM.* Page 6-36
136
True or False
It is possible to terminate
more than one conductor in
the same 66 contact.
True. It is possible to terminate
more than one conductor
in the same 66 contact, but such
practice is not recommended.
TDMM.* Page 6-36
137
Name 4 disadvantages of a
66-style IDC connector.
1. Does not exist in screened versions as a stand-alone connector
2. Covers a comparatively narrow range of transmission performance categories
3. Can exist only in the form of a 66-style connecting block
4. Has a limited number of applications
TDMM.* Page 6-39
138
Name 4 applications
supported by the 66-style
connector.
1 .Demarcation point connecting
hardware
2.Platform for circuit protection
3.Compact cross-connections
and interconnections in voice
and data applications
4.Metal conductor splicing
TDMM.* Page 6-39
139
How many termination
cycles can a BIX-style IDC
connector complete before
its reliability degrades?
At least 200
TDMM.* Page 6-39
140
Name 3 disadvantages of
the BIX-style connector.
1. lt is not widely used by the industry.
2. The conductor termination is performed with a special tool.
3. It is nonexistent in screened versions as a stand-alone connector.
TDMM.* Page 6-41
141
Name 3 reasons the
LSA-style connector is a
popular choice for voice
and data networks.
1 .Unique quality
2.Transmission performance
capabilities
3.UItimate termination density
TDMM.* Page 6-41
142
Name 3 disadvantages of
an LSA-style connector.
1 .Comparatively complex and
expensive design
2.Conductor termination is
performed with a special tool,
which is not always available
3.Not widely used by the data
communications industry
TDMM.* Page 6-43
143
Name the 2 parts of a
modular connector.
1 .Plug (male connector part)
2.Jack (female connector part)
TDMM.* Page 6-44
144
Where are 4P4C modular
connectors primarily used?
Telephone handset cords
TDMM.* Page 6-44
145
Where are 6P4C and 6P6C
modular connectors used?
Telephone and modem cords
TDMM.* Page 6-44
146
Where are 8P8C modular
connectors used?
Data communication lines
and patch cords
TDMM.* Page 6-44
147
How many mating cycles is
a PL 1 modular connector
rated to withstand without
failing?
750 mating cycles
TDMM.* Page 6-44
148
How many mating cycles is
a PL 2 modular connector
rated to withstand without
failing?
2500 mating cycles
TDMM.* Page 6-44
149
What is a modular plug?
A male telecommunications
connector for cables or cords
TDMM.* Page 6-45
150
What does the number of
positions indicate about a
modular plug?
The connector's width
TDMM.* Page 6-46
151
What does the number of
contacts installed into the
available positions indicate
about a modular plug?
The maximum number of
conductors the connector
can terminate
TDMM.* Page 6-46
152
Name 2 disadvantages of a
modular plug.
1 .lt has design-limited
transmission performance.
2.Mechanical contact results in
a limited lifecycle.
TDMM.* Page 6-47
153
What is a modular plug's
typical application?
Equipment cords and
patch cords
TDMM.* Page 4-47
154
What is a modular jack?
A female telecommunications
outlet/connector (socket) that
may be keyed or unkeyed and
may have 4, 6, or 8 contact
positions
TDMM.* Page 6-48
155
Name the 3 types of
eight-position pin/pair
assignments used with
modular jacks.
1.T568A
2.T568B
3.USOC-8
156
Name 5 advantages of
modular jacks.
1 .Most widely used jack design in
data communications
2.Highest-density jack design
3.1nexpensive and easy to
manufacture.
4.Wide variety of configurations.
5.Comparatively high transmission
performance characteristics
TDMM.* Page 6-50
157
Name 2 disadvantages of
modular jacks.
1 .lt has design-limited
transmission performance.
2.Mechanical contact results in
a limited lifecycle.
TDMM.* Page 6-50
158
Name 4 typical applications
for modular jacks.
1 .Work area telecommunications
outlet/connectors
2.Patch panel connectors
3.Prewired connecting blocks
and panels
4.Active equipment input and
output connectors (ports)
TDMM.* Page 6-51
159
What type of connector is
the key system telephone
connector?
50-position miniature ribbon
connectors
TDMM.* Page 6-51
160
What type of special tool is
needed to terminate
50-position miniature
ribbon connectors?
Butterfly tool
TDMM.* Page 6-51
161
True or False
The 50-position miniature
ribbon connectors are
standardized by structured
cabling standards.
False. The 50-position miniature
ribbon connectors are not
standardized by structured
cabling standards, but they are
still widely used as adapters for
connection of certain styles of
active equipment to
telecommunications cabling.
TDMM.* Page 6-53
162
What transmission
performance categories are
available for 50-position
miniature ribbon
connectors?
Category 3, 5, and 5e
TDMM.* Page 6-53
163
Name 3 advantages of
50-position miniature
ribbon connectors.
1 .Widely used in
telecommunications and data
communications industries
2.High density of connections
3.Wide range of designs and
configurations covering many
applications.
TDMM.* Page 6-54
164
Name 2 typical applications
of 50-position miniature
ribbon connectors.
1. Telecommunications
equipment interfaces and
cords
2. Data communications
equipment interfaces and
cords
TDMM.* Page 6-54
165
Name the 5 basic types of
connecting hardware used
with balanced twisted-pair
cabling systems.
1 . Telecommunications
outlets/connectors, including
multiuser outlets
2.Patch panels
3.Connecting (wiring) blocks
4.Cable assemblies
5.Splices
TDMM.* Page 6-55
166
What type of hardware
serves as the end point of
the horizontal cabling?
Balanced twisted-pair
outlets/connectors
TDMM.* Page 6-55
167
Name the 3 main elements
of a telecommunications
outlet/connector assembly.
1 .Mounting box
2.Mounting plate or faceplate
3.Connector
TDMM.* Page 6-56
168
What is an outlet module?
A telecommunications jack
installed into the connecting
hardware housing or on its
printed circuit board
TDMM.* Page 6-56
169
What is the purpose of
balanced twisted-pair
outlets/connectors?
To connect active
telecommunications equipment
to the cabling at work areas
TDMM.* Page 6-57
170
What is a patch panel?
An administration point in the
cabling where the cable is
terminated to connecting
hardware mounted in a panel
assembly that accepts patch
cords
TDMM.* Page 6-57
171
What is the main purpose
of a patch panel as
connecting hardware?
To provide high-density, readily
accessible, reliable, and durable
connection fields in termination
spaces and their counterparts in
specialized telecommunications
systems
TDMM.* Page 6-57
172
Name 3 factors that
determine a patch panel's
design.
1 .Mounting method
2.Style of connector module
3. Transmission medium style
TDMM.* Page 6-58
173
What design detail is
common to all styles of
patch panels?
A steel front panel that serves as
a support for the internal
circuitry and a mounting base
for the connectors
TDMM.* Page 6-58
174
How many connections
(ports) are available in a
high-density patch panel?
48 per 1 RMU
TDMM.* Page 6-58
175
How is cable strain relief
accomplished in a
patch panel?
By using tie wraps or hook-and-
loop straps on a cable
management bar that is
installed at the rear of
the patch panel
TDMM.* 6-59
176
Name 4 typical applications
of patch panels.
1 .lnterconnection connecting
hardware in telecommunications
spaces
2.Cross-connection connecting
hardware in telecommunications
spaces
3.Multiuser telecommunications
outlet assemblies
4.CP and HCP connecting
hardware
TDMM.* Page 6-60
177
What is the maximum
category of transmission
performance that can be
supported by a 66-style
block?
Category 5e
TDMM.* Page 6-61
178
How are cross-connects
created on 66-style blocks?
With bridging clips or cross-
connect jumpers
TDMM.* Page 6-62
179
Name the 3 parts of a
66-style connecting block.
1 .Base equipped with two
mounting tabs
2.Contact-holding body frame
with two fanning strips
3.66-style contacts
TDMM.* Page 6-62
180
What is an optional
component of a 110-style
connecting block?
Standoff legs
TDMM: Page 6-64
181
Does the 1 1 0-style wiring
block contain an IDC?
No. The IDC for this style of
termination application is in the
2-pair (C-2), 3-pair (C-3), 4-pair
(C-4), and 5-palr (C-5)
connecting block, which is
punched down on top of the
1 1 0-style wiring block.
TDMM.* Page 6-64
182
What special tool is needed
to terminate on a
110 block?
A single-position or multipair
punch-down tool
TDMM.* Page 6-64
183
What pair increments are
available for BIX-style
connecting blocks?
50
* 250
* 300
* 900
TDMM.* Page 6-66
184
Name the 4 basic LSA-style
block configurations.
1 .Disconnect modules
2. Connect modules
3.Switching modules
4. Feed-through modules
TDMM.* Page 6-68
185
What pair increments are
available for LSA-style
connecting blocks?
8
10
20
TDMM.* Page 6-68
186
What is the purpose of an
LSA-style connect module?
To provide a continuous link
between the cable and the
cross-connect wiring
TDMM.* Page 6-69
187
What is the purpose of an
LSA-style disconnect
module?
To allow temporary or
permanent disconnect
of the circuit
TDMM.* Page 6-69
188
What is the purpose of an
LSA-style switching
module?
To allow for high-density
termination and patch cables
TDMM.* Page 6-69
189
What is the purpose of an
LSA-style feed-through
module?
To provide a continuous link
between the feeder and the
jumper for high-density
terminations in small areas
TDMM.* Page 6-69
190
What does hybrid mean
when applied to equipment
cords and patch cords?
That the cords have dissimilar
connectors on each end of the
assembly
TDMM.* Page 6-71
191
What correction factor is
used to determine insertion
loss parameters for cable
assemblies with 24 AWG
conductors?
1.2 (20 percent) to
1.5 (50 percent)
TDMM.* Page 6-72
192
What correction factor is
used to determine insertion
loss parameters for cable
assemblies with 26 AWG
conductors?
1.5 (50 percent)
TDMM.* Page 6-72
193
Name 2 advantages of a
cable assembly.
1 .Compact and inexpensive
device for interconnections and
cross-connections
2.Available in multiple
configurations and
transmission performance
levels and categories
TDMM.* Page 6-72
194
Name 3 typical applications
of a cable assembly.
1 .Cross-connections in data and
analog transmission systems
2.1nterconnections in data and
analog transmission systems
3.Connections to test
instruments
TDMM.* Page 6-72
195
What is a balanced twisted-
pair splice?
A device that permanently
joins conductors
TDMM.* Page 6-73
196
How many conductors can
be terminated by a single-
pair splice connector?
2 to 3
TDMM.* Page 6-74
197
How many cable pairs can
be spliced with a multipair
splicing module?
Up to 25 pairs
TDMM: Page 6-74
198
Name 3 advantages of a
balanced twisted-pair
splice.
1.ls widely used in OSP and
premises cabling for
connection, splitting, and re-
routing of cabling segments
2.Provides a cost-effective
method of connection
3.Can be used in a wide range of
applications
TDMM.* Page 6-75
199
Name the 2 typical
applications for a balanced
twisted-pair splice.
1 .Connectorization applications
2.Cabling plant applications
TDMM.* Page 6-76
200
True or False
Optical fiber connectors
and adapters are generally
not specified by cabling
industry standards.
True. Optical fiber connectors
and adapters are generally not
specified by cabling industry
standards.
TDMM.* Page 6-77
201
Name the 3 common types
of optical fiber interfaces.
1 .LC connector
2.SC connector
3.ST compatible
TDMM.* Page 6-77
202
What can be used to
convert a simplex LC
connector to duplex?
A clip
TDMM.* Page 6-77
203
Who establishes the
bandwidth and return loss
of an optical fiber cable?
Manufacturer
TDMM.* Page 6-77
204
What is the only transmission
characteristic that can easily,
reliably, and repeatedly be
measured in the field with
handheld devices?
Attenuation
TDMM.* Page 6-77
205
What type of device is
recommended for pass/fail
determination of optical
loss budgets?
Power meter and
light source
TDMM.* Page 6-77
206
How does the size of an
LC-style connector
compare to the size of an
SC-style connector?
An LC-connector is about
half the size of an SC-style
connector.
TDMM.* Page 6-80
207
What is the disadvantage
of the SC-style optical fiber
connector?
It does not feature
an SFF design.
TDMM.* Page 6-82
208
What prevents an ST-style
connector from rotating?
A key
TDMM.* Page 6-83
209
Name the 2 primary
splicing methods for
optical fiber.
1 .Mechanical
2.Fusion
TDMM.* Page 6-85
210
Name 2 benefits of fusion
splicing compared with
mechanical splicing.
1. Reduced loss (attenuation)
2. Reduced reflectance
TDMM.* Page 6-85
211
What is the minimum
return loss for spliced
multimode fiber?
20 dB
TDMM.* Page 6-87
212
What is the minimum
return loss for spliced
singlemode fiber?
35 dB
TDMM.* Page 6-87
213
Where is optical fiber
pigtail splicing commonly
used?
In premises cabling
environments
TDMM.* Page 6-87
214
Name the 2 application
areas for optical fiber
patch panels.
1 .Rack mounted
2.Wall mounted
TDMM.* Page 6-89
215
Name 3 factors that are
used to determine the style
of optical fiber splicing
hardware.
1 .Mounting requirements
2.Optical fiber strand count
3.Splicing method
TDMM.* Page 6-93
216
What is the splice insertion
loss allowance for network
cabling standards?
0.3 dB per splice
TDMM.* Page 6-94
217
Name the 2 reasons that
optical fiber splicing
hardware is typically used.
1 . To join two discrete optical
fibers as part of a system
design and installation
2. To repair a break in one or
more damaged optical fibers
strands
TDMM.* Page 6-94
218
Name 3 popular styles of
coaxial connectors.
1 .BNC-style connector
2.F-style connector
3.N-style connector
TDMM.* Page 6-95
219
Why should screw-on and
hex connectors be avoided
in commercial installations?
They should be avoided
because of their performance
characteristics. They create
intermittent problems that can
be difficult to troubleshoot
TDMM.* Page 6-95
220
What type of connector is
recommended to ensure
data transfer?
Captive-pin connector
TDMM.* Page 6-95
221
What is the standard
connector for use on RG59,
Series-6, and Series-II cables?
F-style connector
TDMM.* Page 6-95
222
Why are BNC connectors
the most common coaxial
cable connector?
Because of their reliability
and ruggedness
TDMM.* Page 6-96
223
Name the 3 elements of a
typical BNC-style connector.
1. Ferrule
2. Connector body
3. Silver- or gold-plated center pin
TDMM.* Page 6-96
224
Where are 50-ohm BNC
connectors used
most often?
In the audiovisual industry
as a connector for
RF antenna signals
TDMM.* Page 6-97
225
Which type of BNC
connector is most
common?
75-ohm
TDMM: Page 6-97
226
Name the 3 BNC-style
connector designs used in
data network applications.
1 .T-connector
2.Barrel connectors
3. Terminators
TDMM.* Page 6-97
227
Name the 3 versions of the
BNC-style connector
(from a connectorization
point of view).
1 .Crimp
2. Three-piece
3.Screw-on (not recommended)
TDMM.* Page 6-97
228
Typically, a 50-ohm connector
is specified for use at
frequencies up to _ GHz.
Typically, a 50-ohm connector is
specified for use at frequencies
up to 4 GHz.
TDMM.* Page 6-98
229
Typically, a 75-ohm connector
is specified for use at
frequencies up to — GHz.
Typically, a 75-ohm connector is
specified for use at frequencies
up to 2 GHz.
TDMM.* Page 6-98
230
What is the disadvantage
of a BNC-style connector?
Field installation requires
special tools.
TDMM.* Page 6-98
231
What is the most widely
used style of coaxial
connector for residential
cable service?
F -style
TDMM.* Page 6-99
232
True or False
F-style connectors can be
used with cables that have
a stranded center
conductor.
False. F-style connectors cannot
be used with cables that have a
stranded center conductor
because they do not have
center pins.
TDMM.* Page 6-99
233
Why are one-piece F-style
connectors gaining favor?
Because of their higher
bandwidth capabilities for
satellite and broadband
cable installations
TDMM.* Page 6-99
234
What acts as the center pin
for an F-style connector?
The cable's solid center
conductor
TDMM.* Page 6-99
235
F-style connectors have
75-ohm impedance match
up to _ GHz.
F-style connectors have
75-ohm impedance match
up to 1 GHz.
TDMM.* Page 6-100
236
Name 2 disadvantages of
the F-style connector.
1 .lt is less reliable than the
BNC-style connector.
2.Field installation of some
constructions requires
special tools.
TDMM.* Page 6-700
237
Name 2 typical applications
of the F-style connector.
1 .Video transmission and
distribution systems
2.Antenna systems
TDMM.* Page 6-100
238
Name the 3 designs
of N-style connectors that
are used for data network
applications.
1 .Male connectors
2.Barrel connectors
3. Terminators
TDMM.* Page 6-101
239
What bandwidth do
N-style connectors support?
11 GHz to 18 GHz
TDMM.* Page 6-101
240
Name 3 advantages of an
N-style connector.
1 .Provides the highest
bandwidth among coaxial
connectors
2.Easy to use
3.Reliable style of connector
TDMM.* Page 6-102
241
Name 3 disadvantages of
an N-style connector.
1 .Field installation requires
special tools.
2.1t has a narrow range of
different design options.
3.1t is not widely used in analog
and digital transmission
systems.
TDMM: Page 6-102
242
Name 5 typical applications
for N-style connectors.
1 .Land mobile systems
2.WireIess data transmission
systems
3.Paging and cellular systems
4.Cable TV headend systems
5.Antenna systems
TDMM.* Page 6-102
243
Name the 3 basic types of
coaxial connecting
hardware.
1 . Telecommunications outlets/
connectors
2.Patch panels
3.Cable assemblies
TDMM.* Page 6-103
244
Name the 3 elements of a
coaxial outlet.
1 .Mounting box
2.Mounting plate or faceplate
3.Connector
TDMM.* Page 6-104
