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DB > TDMM Chapter 5 > Flashcards

TDMM Chapter 5 Flashcards

1
Q

Access Point (AP)

A

Standalone hardware device that acts as a wireless communications device

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2
Q

ADA

A

Americans with Disabilities Act

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3
Q

AHJ

A

Authority having Jurisdiction

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4
Q

Alternating Current (AC)

A

A current flow that alternates periodically (usually sinusoidal) in magnitude and direction

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5
Q

CP

A

Consolidation Point
An interconnection point within the horizontal cabling system

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6
Q

EF

A

Entrance Facility

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7
Q

EMI

A

Electromagnetic Interference

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8
Q

ER

A

Equipment Room

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9
Q

HC (FD)

A

Horizontal Cross Connect (Floor Distributor)
A group of connectors (patch panel) that allows horizontal, backbone and equipment cabling to be cross connected

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10
Q

IC (BD)

A

Intermediate Cross Connect (Building Distributor)
The connection point between the MC (CD) and the HC (FD)

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11
Q

MC (CD)

A

Main Cross Connect (Campus Distributor)
The cross connect that allows for interconnection of entrance cable, first level backbone and equipment cables

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12
Q

MUTOA

A

Multiuser Telecommunications Assembly
Wall jacks where computers plug in

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13
Q

PON

A

Passive Optical Network
A point to multipoint network in which unpowered optical splitters are used to enable a single optical fiber strand to serve multiple end points

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14
Q

TE

A

Telecommunications Enclosure

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15
Q

Telecommunications Outlet Box

A

A housing used to hold telecom outlets/connectors

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16
Q

Telecommunications Outlet/Connector

A

A connecting device (eg data outlet/fiber adapter) in the work area

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17
Q

TP

A

Transition Point
A location where flat undercarpet cable connects to round cable

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18
Q

TR

A

Telecommunications Room

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19
Q

UTC

A

Undercarpet Telecommunications Cable
Flat cable designed to be installed directly on the surface of a floor under carpet or tiles

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20
Q

VOIP

A

Voice over Internet Protocol
Converts voice signals to packets and transmits over a network

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21
Q

WLAN

A

Wireless Local Area Network

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22
Q

Name three components of a horizontal distribution system

A
  • Horizontal Cabling
  • Horizontal Pathways
  • Telecom Spaces
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23
Q

True or False
The use of the term horizontal in the name of an element requires the element to be placed or installed parallel to the ground

A

False

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24
Q

How are horizontal pathways used?

A

To distribute, support and proved access to horizontal cabling

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25
Q

What is horizontal cabling?

A

The media contained within horizontal pathways

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26
Q

What is the purpose of a continous horizontal pathway?

A

To provide uninterrupted support and management of telecom cabling

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27
Q

What is a non continuous horizontal pathway?

A

The space between cable supports through which cables are placed

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28
Q

Name four applications that can be supported by horizontal cabling systems

A
  • Voice Services
  • Data Services
  • Audio and Video
  • Building Signaling
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29
Q

True or False
Horizontal cabling is often less accessible than backbone cabling?

A

True

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30
Q

What is the required topology for horizontal cabling?

A

Physical Star Topology

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31
Q

Name three exceptions to the requirement to use a physical star topology for horizontal cabling

A
  • A CP or MUTOA is used to connect to open office cabling
  • A TP is required to connect to under carpet cabling
  • Centralized optical fiber cabling is implemented from the MC (CD) to work areas
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32
Q

What is the minimum configuration for a horizontal cabling system?

A

Two telecom outlets in the work area, one for telephony the other data

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33
Q

What is the transmission channel within a horizontal cabling system?

A

The end to end transmission path between two points at which application specific equipment is connected

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34
Q

Name the three elements of the transmission channel

A
  • Permanant link cabling
  • Required patch, equipment and interconnection cords
  • Connection Points
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35
Q

What is the maximum number of connection points that are allowed in the channel model?

A

Maximum four connection points

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36
Q

name four types of connection points allowed in the channel model

A
  • Telecom outlets or MUTOAs
  • Connector of the first unit of connecting hardware at the HC (FD)
  • CP Connector (optional)
  • Connector of the second unit of connecting hardware at the HC (FD)
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37
Q

What is the permanent link?

A

The cabling that extends from the HC (FD) to the telecom outlet

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38
Q

What is the maximum number of connection points permitted in a permanent link?

A

No more than three

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39
Q

What is the maximum number of consolidation points (CPs) permitted within a permanent link?

A

No more than one

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40
Q

How does the cross connection method connect active equipment to the horizontal cabling system?

A

Cross connection is a method where two connecting hardware units are linked by patch cords or jumpers and used to connect active equipment to the horizontal cabling system

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41
Q

What term is used to describe the passive connection of cabling segments of the horizontal and backbone systems?

A

Cross connections

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42
Q

How does an interconnection connect horizontal cabling to active equipment?

A

the horizontal cabling is terminated on the connecting hardware (patch panel) and an equipment cord is used to interconnect the connecting hardware to the active equipment

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43
Q

Name the two benefits of using an interconnection vs a cross connection

A
  • no need for a second unit of connecting hardware and patch cords
  • saves rack/wall space
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44
Q

When are interconnections allowed in the HC (FD)

A

Only when the centralized optical fiber topology is used

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45
Q

Why are application specific devices required to be kept external to the horizontal cabling system?

A

facilitates use of cabling for generic network and service requirements

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46
Q

Why is UTC (under carpet) not recommended for use in telecom systems?

A

Negative aspects related to performance

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47
Q

What are the two components of a UTC system?

A
  • UTC cabling
  • TP where the UTC cabling connects to the horizontal cabling
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48
Q

What is a bridged tap?

A

An old method used to divide one physical comm line into several to support multiple analog subscribers

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49
Q

Why are bridged taps not allowed in a balanced twisted pair system?

A

Risk of decreased performance

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50
Q

If a bridged tap is required to support an analog signal in a specific area, how should it be installed?

A

With an adapter placed external to the permanent link work area connector

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51
Q

True or False
Splicing is not generally permitted within the horizontal cabling system

A

True

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52
Q

When is splicing permitted in a horizontal cabling system?

A

When joining fiber cabling to connecting hardware in the HC (FD)

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53
Q

What types of multimode optical fiber are allowed in horizontal cabling systems?

A

OM3, OM4, OM5

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53
Q

What categories of four pair balanced twisted pair cabling and corresponding connecting hardware are allowed in horizontal cabling systems?

A
  • 5E, 6, 6A, 7, 7A, 8
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54
Q

What types of singlemode optical fiber are allowed in horizontal cabling systems?

A
  • OS1a, OS2
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55
Q

What is the maximum permitted cable length within a permanent link?

A

295ft

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56
Q

What is the maximum permitted length for a 24AWG balanced twisted pair cord that is used within a channel but not within the permanent link?

A

16.5ft

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57
Q

What is the maximum permitted length for a 26AWG balanced twisted pair cord that is used within a channel but not within the permanent link?

A

13ft

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58
Q

What is the purpose of providing cable slack in a horizontal cabling system?

A

Future changes in cable system configuration

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59
Q

How much cable slack is recommended for twisted pair cabling that is terminated in the TR?

A

Enough to reach the farthest corner of the TR plus distance from floor to ceiling without exceeding 295ft

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60
Q

How much cable slack is recommended for optical fiber cabling terminated in the TR?

A

Enough to reach the farthest corner of the TR plus distance from floor to ceiling and an additional 10ft slack without exceeding 295ft

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61
Q

How much cable slack for twisted pair terminated in a work area?

A

1ft

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62
Q

How much cable slack for optical fiber terminated in a work area?

A

3.3ft

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63
Q

What are work areas?

A

Spaces in a building where occupants normally work and interact with their telecom equipment

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64
Q

Name four components that are typically used to accommodate the equipment in a work area

A
  • Telecom outlet/connector
  • Work area equipment cords
  • MUTOAs and CPs
  • WAPs
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65
Q

Name the two key elements of open office cabling

A
  • MUTOA
  • CP
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66
Q

What term describes the connecting device in the work area on which horizontal cabling terminates

A

Telecom outlet/connector

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67
Q

In most cases what type of connector is required for terminating 4 pair balanced twisted pair cabling?

A

8P8C type modular connector

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68
Q

Name the three most common multimode and singlemode optical fiber connectors

A
  • SC
  • ST
  • LC
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69
Q

What is the minimum number of telecommunications outlets required for each work area?

A

One outlet with a minimum of two recognized connectors per outlet

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70
Q

What size telecom outlet box is required to accommodate one or two 1in conduits?

A

Minimum 4x4x2.25

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71
Q

The work area telecom outlet shall be located within ___ of an electrical outlet

A

3.3ft

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72
Q

What is the purpose of a MUTOA?

A

to connect more than one user to the horizontal cabling system

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73
Q

What is the maximum number of work areas that can be served by one MUTOA?

A

twelve

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74
Q

The use of a MUTOA cabling design option allows work area equipment cords to extend beyond ___

A

16.5 ft

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75
Q

Do not use 24 AWG work area equipment cords with lengths that exceed ___

A

72 ft

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76
Q

What is the maximum allowable length of balanced twisted pair cabling when using a MUTOA?

A

295ft

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77
Q

What is the total length of a balanced twisted pair channel when using a MUTOA?

A

328ft (100m)

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78
Q

Why should MUTOAs be installed 49ft from the HC (FD) when balanced twisted pair cabling is used?

A

To minimize the effects of multiple connections in close proximity on near end crosstalk loss and return loss

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79
Q

What is the functional difference between a CP and a MUTOA in the open office environment?

A

the CP introduces an additional connection for each horizontal cabling run

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80
Q

name four spaces where CPs can be located if permitted by codes, standards and regulations

A
  • suspended ceilings
  • access floors
  • modular office furniture
  • work area
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81
Q

how many CPs are permitted in the same horizontal cable run?

A

no more than one

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82
Q

which CP layout offers the highest degree of flexibility?

A

CPs located on all columns

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83
Q

Which CP layout offers the lowest degree of flexibility?

A

CPs located on columns close to the building core

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84
Q

how easily do CPs located in a checkerboard order accommodate change?

A
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85
Q

which type of CP layout does not accommodate changes easily?

A

CPs located near the building core

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86
Q

what type of CP layout tends to use the shortest work area equipment cords?

A

CPs located on all columns

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87
Q

What is a WLAN AP?

A

network device located in areas of a building or campus and placed in relatively close proximity to where users interact with their wireless devices

88
Q

the HDBaseT alliance created a power over HDBaseT (PoH) standard that delivers a maximum of ___W over four pairs

A

95w

89
Q

What are the levels of specifications for HDBaseT?

A

HDBaseT 1.0 and 2.0 which have the same power specifications

90
Q

What is the maximum power at the source for PoE type 1?

A

15.40w

91
Q

What is the maximum power at the source for PoE type 2?

A

300mA

92
Q

What is the maximum power at the source for PoE type 3?

A

600mA

93
Q

What is the maximum power at the source for PoE type 4?

A

100w

94
Q

What is the maximum current per pair for PoH?

A

1000mA

95
Q

what is the maximum operating temperature for cabling?

A

140 degrees F

96
Q

what cable jacket temperature rating is recommended for cabling that will be used in BAS/BMS?

A

167 degrees F

97
Q

what is the minimum recommended category of balanced twisted pair cabling for AV systems?

A

shielded category 6A

98
Q

what size conductors are recommended for lighting systems?

A

23awg min/ 22awg

99
Q

what is the minimum recommended category of balanced twisted pair cabling for WLAN systems?

A

category 6A

100
Q

patch cords smaller in diameter than ___ awg shall not be used to support delivery of power

A

28 awg

101
Q

how does temperature rise affect the electrical performance of a cable?

A

temperature rise causes electrical performance of the cable to degrqde

102
Q

what is the maximum number of cables in a cable bundle?

A

24 cables

103
Q

name the three factors used to determine NEC ampacity ratings for balanced twisted pair cabling

A
  • bundle size
  • conductor diameter (awg)
  • cable temp ratings
104
Q

what is the most common cable temp rating?

A

60 degrees C (140 degrees F)

105
Q

how is PoE transmitted?

A

using common mode voltage on the cable pairs

106
Q

why are metal body 8P8C connectors recommended for PoE applications instead of plastic ones?

A

metal improves hear dissipation

107
Q

why should 50 micron gold plated tines be specified for PD modular connectors and parch cords?

A

connectors and patch cords without gold plating will fail earlier when uses for PoE

108
Q

what drawback is associated with deploying large numbers of PoE switches?

A

significant wasted power

109
Q

what is an advantage of specifying the use of midspan devices?

A

they offer power to PoE devices on legacy switches

110
Q

why should power injectors be located as close as possible to the receiving equipment or device

A

minimize power loss and heating of cabling

111
Q

Name the three methods for connecting work areas to a centralized cross connect

A
  • pull through cables from the centralized cross connect
  • interconnection cabling in a floor serving telecom space
  • spliced cabling in a floor serving telecom space
112
Q

Where is the pull through method typically used?

A

In small one or two story buildings with a limited number of users

113
Q

Where is the backbone cabling method typically used?

A

In larger buildings where permanently routed backbone cables would minimize disruption to firestop assemblies when adding new users

114
Q

True or False
A centralized optical fiber cabling installation can be deployed between buildings or across campus

A

False, centralized means in a building

115
Q

What is the recommended length limit for pull through method

A

1000ft maximum or maximum length for the application, whichever is smaller

116
Q

Name the three primary components of an FTTO system

A
  • passive cabling
  • containment system
  • active network equipment
117
Q

Describe the construction of a pre terminated assembly

A

a 2 strand fiber cable that has been terminated with LC connectors on one side

118
Q

How many work areas are served by a micro switch?

A

1 to 2

119
Q

What topology serves as the basis of an FTTO system?

A

Centralized cabling topology

120
Q

True or False
The FTTO design does not use any active equipment in the floor TR or TE

A

True

121
Q

Name four variants of redundancy possible in the FTTO design

A
  • Variant 1: classical FTTO with cascading via balanced twisted pair cable
  • V2: classical with cascading via optical fiber cable
  • V3: dual homing - double fiber connections
  • V4: dual homing - single fiber connection
122
Q

What is a PON?

A

Point to Multipoint network architecture in which unpowered optical splitters are used to enable a single fiber strand to serve multiple end points

123
Q

Name three advantages of a PON

A
  • reduces physical cabling
  • minimizes telecom space requirements
  • reduces electrical power needed
124
Q

Name the five primary PON variations

A
  • BPOND (legacy)
  • GPON
  • EPON
  • 10GPON
  • 10G-EPON
125
Q

What enables bidirectional communications over one strand of optical fiber as well as multiplication capacity in PON systems?

A

WDM technology

126
Q

What is commonly referred to as the aggregation point for PON architecture?

A

Optical Line Terminal (OLT)

127
Q

Which components acts as the user interface for the PON system?

A

Optical Network Terminal (ONT)

128
Q

Name the two commonly deployed enterprise PON ONTs

A
  • 4 port desktop ONT
  • Faceplate style ONT
129
Q

What is the maximum channel attenuation for IEEE 802.3 EPON?

A

20 dB

130
Q

What is the maximum supported distance for IEEE 802.3 EPON?

A

6.2 mi

131
Q

What is the maximum channel attenuation for ITU G.987 10GPON?

A

31 dB

132
Q

What is the maximum supported distance for ITU G.987 GPON?

A

25 mi

133
Q

What is the purpose of the passive optical splitter?

A

To split the single fiber output from each PON link existing the OLT to a variety of splitter ratio outputs

134
Q

What split ratio is typically used for enterprise PON deployments?

A

1:32

135
Q

What serves as the permanent link of a PON?

A

A simplex singlemode optical fiber cabling connection

136
Q

What is usable floor space?

A

The building area used by occupants for their normal daily work functions

137
Q

How much space is commonly allocated for an individual workspace?

A

100 sq ft

138
Q

How much total floor space should be allocated for every BAS outlet?

A

250 sq ft

139
Q

How many cables should be provided for each system or coverage area in a BAS?

A

1 cable

140
Q

Telecom outlets should not be placed back to back in adjacent rooms, why?

A

compromises sound barrier and firestop

141
Q

Why are telecom boxes mounted at the same height as electrical outlet boxes?

A

uniform appearance and accessibility in the work area

142
Q

A conduit run should have no single bend greater than ___ degrees

A

90 degrees

143
Q

A conduit run should not contain an aggregate of bends in excess of __ between pull boxes

A

180 degrees

144
Q

What is the length limitation for continuous sections in a conduit run?

A

100ft

145
Q

What is a conduit body?

A

A conduit coupling that has a removable cover

146
Q

What is the primary purpose of a conduit body?

A

To give access to or change direction of the conduit system

147
Q

Name the three most common styles of conduit body

A
  • 90 degree bend
  • T configuration
  • C or straight line fitting
148
Q

What formula is used to calculate the cross sectional area of a cable or conduit?

A

Cross Sectional Area = 0.785x d squared

149
Q

How should the pathway design be adapted if the conduit run requires more than two 90 degree bends?

A

Add pull boxes

150
Q

How should the pathway design be adapted if the conduit run requires a reverse bend?

A

Add pull boxes at each angle from 100 to 180 degrees

151
Q

Name three instances where a third bend may be permitted in a conduit run

A
  • total run is not longer than 33 ft
  • conduit size is increase
  • one bend is within 12 in of the cable feed end
152
Q

Name two requirements for placing a pull box in a ceiling space

A
  • Pull box must be listed for that purpose
  • Ceiling panel must be marked and removable
153
Q

What is the minimum length for a pull box?

A

16 times the diameter of the largest conduit

154
Q

What are the depth and width requirements for the pull box?

A

Must be adequate for fishing, pulling and looping cable

155
Q

True or False
A slip sleeve should be used as a splice location?

A

False

156
Q

What term refers to a sheet metal housing that is placed over an opening in a conduit run?

A

Gutter

157
Q

What is the advantage of underfloor conduit systems?

A

Low installation cost for areas with only a few outlets

158
Q

Name the two general types of access floors

A
  • standard height floor
  • low profile floor
159
Q

What is the most common type of access floor?

A

Standard height floor

160
Q

How are low profile floors defined?

A

Floors less than 6 in high

161
Q

What are the four typical components of an access floor?

A
  • steel footings
  • pedestals
  • floors with or without stringers
  • modular floor panels
162
Q

What are the three major purposes of stringered systems?

A
  • to brace pedestals
  • to provide additional support for panels
  • facilitates frequent removal and replacement of floor panels
163
Q

What is the sole support for panels in freestanding and cornerlock access floors?

A

Pedestals

164
Q

What is the finished height restriction for freestanding systems?

A

12 in or less

165
Q

What is the recommended clearance for cable or cable pathways in low profile floors?

A

0.75 in

166
Q

What is the minimum clearance for standard height floors in a general office area?

A

6 in above structural floor

167
Q

What is the recommended clearance for standard height floors in a general office area?

A

8 in above structural floor

168
Q

What is the recommended minimum clearance for standard height floors in a general office area when multiple systems will be installed?

A

12 in above structural floor

169
Q

What is the required finished floor height where the plenum will be used for HVAC?

A

12 in or greater

170
Q

How much free space is required between the top of the cable tray side rails and the underside of the stringers?

A

Minimum of 2 in

171
Q

What two common types of building structures should be considered when planning access flooring for new and existing buildings?

A
  • depressed slab
  • normal slab
172
Q

What materials should be used to cover floor panels in a computer room?

A

High pressure laminate, vinyl or other durable tiles

173
Q

What materials should be used to cover floor panels in an office?

A

Factory laminated carpet or no material

174
Q

What is the uniform load capacity for a medium duty ER?

A

100 lbf/sqft

175
Q

What is the concentrated load capacity for a medium duty ER?

A

2000 lbf

176
Q

What is the uniform load capacity for a medium duty general office?

A

50 lbf/sqft

177
Q

Name two causes of dynamic load?

A
  • accidental impact
  • rolling objects
178
Q

Name four methods of containment for main runs

A
  • dedicated routes
  • enclosed raceway distribution
  • cable trays
  • cable matting
179
Q

How much clear vertical space is needed above conduits in a ceiling space?

A

Min 3in

180
Q

How much clear vertical space is needed above raceways in a ceiling space?

A

Min 12in

181
Q

What size zones are used with the ceiling zones method?

A

Into ~250 sqft to ~1000 sqft zones

182
Q

How much space should be between a suspended ceiling and cabling pathways?

A

Up to 6 in

183
Q

What is the maximum interval spacing that can be used between non continuous cable supports? (j hooks)

A

5ft

184
Q

What is a utility column?

A

A post used by a ceiling distribution system

185
Q

Name two requirements for concealing cabling behind walls

A
  • An unimpeded vertical path
  • A pull cord
186
Q

How are cable tray systems commonly used?

A

As distribution systems for cabling within a building

187
Q

What type of cable tray consists of two side rails connected by individual transverse rungs or stringers?

A

Ladder

188
Q

What type of cable tray has a ventilated bottom with side rails?

A

Ventilated trough

189
Q

How wide is a ventilated channel cable tray?

A

No more than 6in

190
Q

What type of cable tray is an open tray having a central rigid spine with cable support ribs along the length at 90 degree angles?

A

Spine

191
Q

What is a basket tray?

A

A cable tray made of a welded steel wire mesh

192
Q

Name four types of cable tray fittings

A
  • Elbows
  • Reducers
  • Crossovers
  • Tees
193
Q

Name five types of accessories used with cable trays

A
  • Covers
  • Hold down devices
  • Dropouts
  • Conduit Adapters
  • Dividers
194
Q

What determines a cable tray systems load capacity?

A
  • Static load capacity of the tray
  • Length of the support spans
195
Q

Name three items that are installed to support cable trays

A
  • cantilever brackets
  • trapeze supports
  • individual rod suspension brackets
196
Q

Trays and wireways are usually supported on __ centers unless they are designed for greater spans

A

5ft centers

197
Q

A support shall also be placed within ___ on each side of any connection to a fitting in cable tray

A

2ft on each side

198
Q

True or False
Cable trays may be used as walkways, ladders or support for personnel

A

False

199
Q

Where are messenger or support strands used?

A

In ceiling voids, crawl spaces, tunnels and areas with unfinished, exposed or structural ceilings

200
Q

How are perimeter pathways often used?

A

to serve work areas where telecom devices can be reached from walls or partitions

201
Q

What is the practical capacity for telecom cabling in perimeter raceways?

A

Between 20 and 40 percent fill, depending on cable bending radius

202
Q

Where should perimeter raceways be used?

A

Small floor areas where the majority of telecom service will be along walls

203
Q

Name three types of molding raceways

A
  • picture molding for use in rooms
  • wood or eaves trough metal molding for use in hallwys
  • baseboard and crown molding
204
Q

What is the recommended separation between telecom and electrical pathways running in parallel?

A

Min 2in

205
Q

Name the two purposes of a poke thru device

A
  • Maintain floor fire rating
  • Provide power and telecom cabling to open spaces
206
Q

How many interior TTYs must be provided in a covered shopping mall?

A

1, regardless of amount of phones

207
Q

What locations in a hospital are required to provide TTYs on a public phone?

A
  • Emergency room
  • Waiting room
  • Recovery room
208
Q

Where are TTYs required in bus and rail facilities?

A

At the entrance to the facility

209
Q

Where are TTYs required in an airport?

A
  • Concourse within the security area
  • Baggage claim area
210
Q

What percentage of the first 100 rooms of a hotel must be equipped with a TTY?

A

4 percent

211
Q

Under the ADA what is the maximum high side reach for unobstructed high side reach telephones?

A

48in

212
Q

Under the ADA what is the maximum high forward reach for unobstructed forward reach telephones?

A

48in

213
Q

What is the universal installation height for telephones?

A

48in

214
Q

Under the ADA how many public telephones in a newly constructed facility must be equipped with volume control?

A

25 percent

215
Q

What does TTY stand for?

A

Teletypewriter

216
Q

True or False
Unless a state law or local building code adopts the ADA requirements, state and local building inspectors will not enforce the law

A

True, ADA is a civil rights law. Unless it is a state law or local building code it is not enforceable

217
Q

How is the ADA enforced?

A

By action of an aggrieved party (lawsuit)

DB (19 decks)

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