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Chapter 4 Flashcards

1
Q

Backbone Distribution
System

A

The part of the premises
distribution system that provides
connection between
telecommunications spaces.
TDMM.* Page 4-1

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2
Q

CO

A

Central Office
A common carrier switching center
office (also called public exchange)
that is conveniently located in areas to
serve subscriber homes and
businesses. It provides telephony
services (lines) that are connected on
a local loop. The CO contains
switching equipment that can switch
calls locally or to long-distance carrier
telephone offices.
TDMM.* Page G-34

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3
Q

EF

A

Entrance Facility
An entrance to a building for both
public and private network service
cables (including wireless),
including the entrance point of the
building and continuing to the
entrance room or space. (TIA)
TDMM: Page 4-1, Table 4.1

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4
Q

EFM

A

Ethernet in the Fist Mile
Term used to describe the
access network from the access
point to the subscriber’s
premises. Also referred to as
Ethernet in the last mile.
TDMM.* Page 4-53

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5
Q

ER

A

Equipment Room
An environmentally controlled
centralized space for
telecommunications equipment
that usually houses a main or
immediate cross-connect. (T IA)
TDMM.* Page 4-1, Table 4.1

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6
Q

HC (FD)

A

Horizontal Cross-Connect
(Floor Distributor)
A group of connectors that allow
equipment and backbone
cabling to be cross-connected or
interconnected with patch cords
or jumpers to horizontal cabling.
TDMM.* Page 4-2, Table 4.1

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7
Q

IC (BD)

A

Intermediate Cross-Connect
(Building Distributor)
The connection point between a
backbone cable that extends
from the MC (CD) [first-level
backbone] to the HC (FD)
[second-level backbone].
TDMM.* Page 4-2, Table 4.7

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8
Q

MC (CD)

A

Main Cross-Connect
(Campus Distributor)
The cross-connect normally
located in the (main) equipment
room for cross-connection and
interconnection of entrance
cables, first level backbone
cables, and equipment cables.
TDMM.* Page 4-2, Table 4.1

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9
Q

RMC

A

Rigid Metallic Conduit
A threaded metal raceway of
circular cross-section With
a coupling. RMC is the heaviest-
weight and thickest-wall steel
conduit.
TDMM: Page 4-42

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10
Q

TE

A

Telecommunications Enclosure
A case or housing that may
contain telecommunications
equipment, cable terminations,
or horizontal cross-connect
cabling. (TIA)
TDMM.* Page 4-1, Table 4.1

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11
Q

TR

A

Telecommunications Room
An enclosed architectural space
for housing telecommunications
equipment, cable terminations,
and cross-connect cabling. (T IA)
TDMM.* Page 4-7, Table 4.1

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12
Q

Name the 2 typical
functions a backbone
system provides
in a campus.

A

1 .Building connections between
floors in multi-story buildings
2.Campus connections in multi-
building environments
TDMM.* Page 4-1

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13
Q

Name 7 components of a
backbone distribution
system.

A

1 .Cable pathways
2. ERs that may contain HCs (FDs),
ICs (BDs), or MCs (CDs)
3.TRs that typically contain HCs (FDs)
4.TEs that typically contain HCs (FDs)
5.Entrance facility (EF)
6.Transmission media
7.Miscellaneous support facilities
TDMM: Page 4-1

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14
Q

Which component of the
backbone distribution
system provides routing
space for cables?

A

Cable pathways
TDMM.* Page 4-1, Table 4.1

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15
Q

Which component of a
backbone distribution
system usually houses the
main cross-connect (MC)?

A

Equipment room (ER)
TDMM.* Page 4-1, Table 4.1

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16
Q

Which component of a
backbone distribution
system is described as an
enclosed architectural
space for housing
telecommunications
equipment, cable
terminations, or horizontal
cross-connect cabling?

A

Telecommunications room (T R)
TDMM.* Page 4-1, Table 4.1

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17
Q

Which component of a
backbone distribution
system is described as a
case or housing that may
contain telecom equipment,
cable terminations, or
horizontal cross-connect
cabling?

A

Telecommunications enclosure
TDMM: Page 4-1, Table 4.1

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18
Q

Which component of the
backbone distribution
system serves as an
entrance to the building for
both public and private
network service cables?

A

Entrance facility (EF)
TDMM.* Page 4-1, Table 4.1

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19
Q

Name the 4 primary types
of transmission media that
can be used for backbone
cabling.

A

1 .Optical fiber
2.Balanced twisted-pair
3.Coaxial
4.Wireless
TDMM.* Page 4-2, Table 4.1

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20
Q

Name 5 examples of
connecting hardware that
can be used as
components of a backbone
distribution system.

A

1 .Connecting blocks
2.Patch panels
3.Patch cords and jumpers
4.Interconnections
5.Cross-connections
TDMM.* Page 4-2, Table 4.1

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21
Q

Name 4 examples of
miscellaneous support
materials that are needed
for the proper termination
and facilities installation of
backbone cables.

A

1 .Cable support hardware
2.Firestop
3.Bonding hardware
4.Protection and security
TDMM.* Page 4-2, Table 4.1

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22
Q

What term refers to a group of
connectors that allow
equipment and backbone
cabling to be cross-connected
or interconnected with patch
cords or jumpers to horizontal
cabling?

A

Horizontal Cross-Connect (HC)/
Floor Distributor (FD)
TDMM.* Page 4-2, Table 4.1

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23
Q

Which component serves as
the connection point between
the first level backbone and the
second
level backbone?

A

Intermediate Cross-Connect (IC)/
Building Distributor (BD)
TDMM: Page 4-2, Table 4.1

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24
Q

Which component is normally
located in the main ER for the
cross-connection and
interconnection of entrance
cables, first level backbone
cables, and equipment cables?

A

Main Cross-Connect (MC)/
Campus Distributor (CD)
TDMM.* Page 4-2, Table 4.1

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25
Name the 3 fundamental cabling topologies.
1 .Star 2.Ring 3.Bus TDMM.* Page 4-3
26
Name 5 types of hybrid cabling topologies.
1 .Hierarchical star 2.Star-wired ring 3.Clustered star 4. Tree and branch 5.Mesh TDMM.* Page 4-3
27
What topology is generally deployed for OSP cabling?
Star TDMM: Page 4-4
28
A star topology directly links all buildings requiring connection to the ____
MC (CD) TDMM.* Page 4-4
29
What is the ideal location for the MC (CD)
*Colocated with or close to the primary ER *At the center of the buildings being served. TDMM.* Page 4-4
30
Name 5 advantages associated with using a star topology for campus backbone cabling.
1 .Provides centralized facilities administration 2.Allows testing and reconfiguration of the systems topology and applications from the MC (CD) 3.Allows easy maintenance and security against unauthorized access 4.Provides increased flexibility 5.Allows the easy addition of future campus backbones TDMM.* Page 4-4
31
Name 2 disadvantages associated with using a star topology for campus backbone cabling.
1 .lntroduces single points of failure 2.Increases cost TDMM.* Page 4-4
32
What term is used to describe the tree-like structure where a trunk and branch relationship exists within a cabling topology?
Hierarchical TDMM.* Page 4-6
33
True or False The link from the MC (CD) to the IC (BD) may be an interbuilding or an intrabuilding link.
True. The link from the MC (CD) to the IC (BD) may be an interbuilding or an intrabuilding link. TDMM.* Page 4-6
34
What type of link is typically found between the IC (BD) and the HC (FD)?
An intrabuilding link TDMM.* Page 4-6
35
What configuration should the ICT designer consider when the distance from the switch to the last workstation exceeds the transmission limit?
Hierarchical star TDMM.* Page 4-7
36
What type of configuration should the ICT designer consider using when available pathways do not allow for all cables to be routed to an MC (CD)?
Two-level hierarchical star TDMM.* Page 4-7
37
Why are ring topologies being used for OSP operations?
Because they can support high-bandwidth transport applications TDMM.* Page 4-8
38
Name 3 benefits associated with using a ring topology.
1 .FauIt-tolerant redundant routing 2.Greater reliability and significantly less cabling service downtime 3.Flexible architecture TDMM.* Page 4-8
39
What 3 conditions must be met before a physical ring topology can be considered for connecting the intrabuilding ICs (BDs) and MCs (CDs)?
1 . The existing pathways must support it. 2. The primary purpose of the network is optical fiber distributed data interface, SONET, token ring, or reverse path Ethernet. 3. There is a redundant cable path. TDMM.* Page 4-9
40
When would a physical star/logical ring be used?
*When OSP designer determines that a physical ring route is not possible *When an existing cable will be used in a segment of the total project TDMM.* Page 4-11
41
Name 3 factors the ICT designer will use to determine if a clustered star topology is an appropriate solution.
1 .Electronics 2.Designer's survivability plans 3. Transmission budget selected at the MC (CD) and each node site TDMM.* Page 4-12
42
Name 3 advantages associated with using a clustered star topology.
1 .Allows for fault-tolerant redundant routing at route locations 2.May reduce design costs for the electronics and cables at the node sites 3. Takes advantage of the concentration of electronic equipment in a common location for network management operations and efficiency TDMM.* Page 4-12
43
What type of topology is a linear configuration?
Bus topology TDMM: Page 4-13
44
What will happen if a break occurs along the route of a bus configuration?
All network communications will be lost. TDMM.* Page 4-13
45
What is a common application of the tree and branch topology?
Cable tv operations that use coaxial cabling TDMM.* Page 4-74
46
Name the 2 types of mesh network topologies.
1 .Fully connected 2.Partially connected TDMM.* Page 4-15
47
Why are fully connected mesh topologies not adopted for most networks?
1. Too expensive 2. Too complex TMM.* Page 4-15
48
Where are fully connected mesh topologies commonly used?
In provider and enterprise networks to connect their routers TDMM.* Page 4-15
49
What formula is used to calculate the number of nodes required for a fully connected mesh topology?
N=(x * (x-1))/2 N = Number of links x = Number of nodes TDMM.* Page 4-76
50
What is the minimum number of subscribers supported by the OLT?
16 per port TDMM.* Page 4-18
51
Where is the ONU assumed to be located?
The ONU is assumed to be outside the home. TDMM.* Page 4-19
52
Name 3 locations where Ethernet over PTP balanced twisted-pair cable might be a good fit.
1 .Established neighborhoods 2.Business parks 3.Multi-dwelling units (MDUs) TDMM.* Page 4-22
53
Why are load coils used?
To improve the (voice) transmission performance TDMM.* Page 4-23
54
What is a drawback associated with using load coils?
They increase the insertion loss of the transmission path outside the normal passband range. TDMM.* Page 4-23
55
How many levels of cross- connections are permitted in a backbone distribution system?
No more than 2 TDMM.* Page 4-27
56
When are direct connections between TRs permitted?
When the backbone distribution system is expected to meet the requirements for a bus or ring topology configuration TDMM.* Page 4-31
57
What are the 2 primary design options for building backbone?
1 .Star 2.HierarchicaI star TDMM.* Page 4-32
58
What is often the most cost-effective transmission medium for data systems?
Optical fiber TDMM.* Page 4-36
59
What is often the most cost-effective transmission medium for voice systems?
Balanced twisted-pair TDMM.* Page 4-36
60
True or False The MC (CD) shall be co- located In the ER with a PBX, security monitoring equipment, and other active equipment being served.
False. Although it is ideal to co- locate the MC (CD) in the ER with a PBX, security monitoring equipment, and other active equipment being served, it is not required and may not be possible. TDMM.* Page 4-37
61
True or False A building cabling system shall have only one MC (CD).
True. A building cabling system shall have only one MC (CD). TDMM.* Page 4-37
62
Name 4 factors to consider when selecting the transmission media to be used in a backbone distribution system.
1 .Flexibility of the medium with respect to supported devices 2.Required useful life of backbone cabling 3.Site size and user population 4.User needs analysis and forecast TDMM.* Page 4-38
63
What type of multimode fiber is recommended for backbone cabling systems?
OM4 or higher TDMM.* Page 4-38
64
Name the 2 most common configurations for Category 5e cable.
24 AWG or up to 22 AWG round, solid copper conductors with a nominal characteristic impedance of 100 ohm TDMM.* Page 4-38
65
Name the 3 categories of balanced-twisted cable that are specified for multipair backbone cabling.
1 .Category 3/Class C 2.Category 5e/Class D 3.Category 6/Class E TDMM.* Page 4-39
66
Name the 2 most common configurations for Category 5e cable.
.4 pair *25 pair TDMM.* Page 4-39
67
What is the cable length limitation for backbone cable in a voice system?
800m (2625 ft) TDMM.* Page 4-39
68
What is the length limit for cables between network equipment connections?
-100 m (328 ft) TDMM.* Page 4-39
69
True or False Optical fiber cable offers immunity to EMI and RFI.
True. Optical fiber offers immunity to EMI and RFI. TDMM.* Page 4-39
70
Whom should the ICT designer contact for guidance if the optical fiber backbone will be used for a unique specification?
The original equipment manufacturer (OEM) TDMM.* Page 4-40
71
What is the most common type of internal/inside backbone pathway?
Vertically aligned TRs with connecting sleeves or slots TDMM.* Page 4-41
72
Why is it considered desirable to "stack" TRs with other mechanical spaces?
Stacking makes the distribution of telecommunications cables more efficient because of shorter conduits, bonding, and cable runs. TDMM.* Page 4-41
73
Name 3 types of steel conduit that are commonly used in backbone distribution systems.
1.RMC 2.IMC 3.EMT TDMM.* Page 4-42
74
What is the benefit of specifying the use of RMC with PVC coating (both inside and outside) for underground pathways?
The PVC coating prevents long-term rust. TDMM.* Page 4-42
75
Name 2 ways that IMC differs from RMC.
1 .Has a thinner wall thickness than RMC 2.Weighs about 1/3 less than RMC TDMM.* Page 4-43
76
What is the lightest-weight metallic conduit manufactured for use in backbone distribution systems?
EMT ("thin wall") TDMM.* Page 4-43
77
What is the required height for a curb for a slot?
A minimum of =25.4 mm (1 in) TDMM.* Page 4-43
78
How far are sleeves permitted to extend above floor level?
*Minimum of -25.4 mm (1 in) *Maximum of mm ( 3 in) TDMM.* Page 4-43
79
Why should you leave at least =25.4 mm (1 in) sleeves and the wall or Other sleeves?
To allow room for bushings TDMM.* Page 4-43
80
Name 2 potential negative consequences of placing sleeves too far from the wall.
1 .May become a tripping hazard 2.May create too great a cable span from the sleeve to the backboard/tray TDMM.* Page 4-43
81
Per the TDMM, what is the baseline requirement for sleeves per floor?
Four 103 metric designator (4 trade size) sleeves + one additional 103 metric designator (4 trade size) sleeve for each 3716 m2 (40,000 ft2) of usable floor space TDMM.* Page 4-44
82
What is the maximum number of rows of sleeves that should be used?
The number should be restricted to 2 whenever practicable. TDMM.* Page 4-45
83
True or False Slots should be designed to have the widest depth permitted.
False. Preference should be given to narrower depths whenever possible. TDMM.* Page 4-46
84
Who is responsible for approving the location and configuration of slots?
Structural engineer TDMM.* Page 4-46
85
Who is typically responsible for directing cable shaft use
Building managers TDMM.* Page 4-46
86
True or False Backbone cable pathways are permitted in elevator shafts.
False. Backbone cable pathways cannot be located in elevator shafts. TDMM.* Page 4-46
87
Whom should the ICT designer consult for information about the maximum vertical rise distance of a cable?
Cable manufacturer TDMM.* Page 4-47
88
Whom should the ICT designer consult when questions arise about floor penetrations?
The building's licensed structural engineer TDMM.* Page 4-47
89
Name 3 potential negative consequences of cable that has been installed without the proper support.
1 .Slippage between the cable core and the sheath 2.Stretching of copper conductors and breakage of the optical fiber strands 3.Broken cable, which can then fall through the pathway and damage other cables and equipment or possibly result in personal injury TDMM.* Page 4-47
90
How many cable ties should be used per floor to secure a backbone cable to a vertical steel support strand?
A minimum of 3 TDMM.* Page 4-48
91
What is optical fiber strand count?
The number of optical fibers installed in the cable plant TDMM.* Page 4-49
92
What is the most common application for optical fiber backbone cabling?
Multiplexed transmission TDMM.* Page 4-50
93
Name 4 reasons to include spare optical fibers when installing optical fiber backbone cabling.
1 .Maintenance 2.Redundancy 3.Segregated applications 4.Future applications TDMM.* Page 4-50
94
Name the 2 mounting methods for indoor backbone cabling hardware
1 .Rack mounted 2.Wall mounted TDMM.* Page 4-51
95
Name 4 locations where rack-mounted hardware is commonly used.
1 .Data centers 2.Equipment rooms (ERs) 3.Computer rooms 4. Telecommunications rooms (TRs) TDMM.* Page 4-51
96
When is wall-mounted hardware used for a backbone distribution system?
When rack space is not available or equipment must be wall mounted TDMM.* Page 4-51
97
Name 3 design factors to consider for indoor hardware.
1 .Splicing hardware 2. Terminating hardware 3.Patch panels TDMM.* Page 4-51
98
Where is indoor hardware most commonly used in a backbone distribution system?
In cable terminations TDMM.* Page 4-51
99
Name 3 factors used to determine splicing hardware.
1 .Mounting requirements 2.Optical fiber count 3.Splicing method TDMM.* Page 4-51
100
Name 4 factors that must be known in order to specify terminating hardware.
1 .Location 2.Cable type 3. Termination method 4.Copper pair count or fiber strand count TDMM.* Page 4-51
101
Name 2 factors used to determine how much space is needed for a patch panel.
1 .Number of links terminated 2.Space needed for growth TDMM.* Page 4-52
102
What is the benefit of interconnecting the cable plant to the applications equipment via patch cords?
This method minimizes accidental damage to the backbone cable. TDMM.* Page 4-52
103
What is the purpose of EFM?
To specify the functionality required for the subscriber access network TDMM.* Page 4-53
104
Why is the first mile significant?
It is the critical connection between business and residential users and the public network. TDMM.* Page 4-53

MJ Class (23 decks)

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