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DB > TDMM Chapter 3 > Flashcards

TDMM Chapter 3 Flashcards

1
Q

Access Provider (AP)

A
  • A company that provides a service path between a service provider and the client user
  • Operator of a facility that is used to convey telecommunications signals to and from a client premises
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2
Q

ACS

A

Access Control System

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3
Q

AHJ

A

Authority Having Jurisdiction

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4
Q

BAS

A

Building Automation System

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5
Q

Demarcation Point (DP)

A
  • A point where the operation control or ownership changes
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6
Q

EF

A

Entrance Facility
An entrance to a building for both public and private network service media

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7
Q

EP

A

Entrance Point
The point of emergence for telecommunications cabling through an exterior wall, floor or conduit

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8
Q

ER

A

Equipment Room
An environmentally controlled or centralized space for telecommunications equipment that usually houses an MC (CD) or IC (BD)

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9
Q

HC (FD)

A

Horizontal Cross-Connect (Floor Distributor)
A group of connectors (patch panels, punch downs) that allow horizontal, backbone and equipment cabling to be cross connected with patch cords or jumpers

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10
Q

IC (BD)

A

Intermediate Cross-Connect (Building Distributor)
The connection point between a backbone cable that extends from the main cross connect (MC (CD)) and the backbone cable from the horizontal cross-connect (HC (FD))

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11
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, backbone and equipment cables

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12
Q

Service Provider (SP)

A

The operator of any service that furnishes telecommunications content delivered over access provider facilities

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13
Q

TE

A

Telecommunications Enclosure
A case or housing for telecommunications equipment, cable terminations and cross-connect cabling

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14
Q

TR

A

Telecommunications Room
An enclosed architectural space for housing telecommunications equipment, cable terminations and cross-connect cabling

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15
Q

How are telecommunications spaces defined?

A

As rooms and areas where telecommunications cabling systems are terminated, cross-connected and interconnected to installed telecommunications equipment

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16
Q

Why should a telecommunications space that serves multiple tenants be in a common space that can be accessed through a common corridor or outside door?

A

Limits interruption of building tenants.

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17
Q

Who should have access to a locked telecom space, area or room?

A
  • Owners maintenance personnel
  • Building Management
  • Common key/access control credential holders
  • Each tenant
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18
Q

Name two strategies to limit acoustic noise levels in a telecommunications space

A
  • Locate noise generating equipment outside the telecom space
  • Specify use of sound barriers if equipment cannot be relocated
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19
Q

What should be the minimum ceiling height in a telecom space?

A

8ft AFF

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20
Q

What is the recommended ceiling height to consider using in a telecom space?

A

10ft AFF

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21
Q

True or False
Suspended ceilings are preferred in telecom spaces?

A

False

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22
Q

Name two potential consequences of installing excessively tall equipment racks in a telecom space

A
  • May require special lighting
  • May require wider working clearances
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23
Q

Why is it important to select a ceiling finish that is light colored?

A

Enhances room lighting

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24
Q

How much clearance should be provided for the installation and maintenance of cabling that is mounted on a wall

A

3.28ft (1m)

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25
Q

What is the minimum recommended depth that should be provided for wall mounted equipment?

A

6in

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26
Q

How much working clearance (front and rear) should be provided around installed equipment?

A

3.28ft (1m)

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27
Q

What is the minimum recommended side clearance when equipment will be mounted in the corners of a telecom space?

A

12in

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28
Q

True or False
If possible, sleeves, slots and conduits should be located where they permit cable terminations to be performed from left to right

A

True

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29
Q

How far should a cable tray located within a ceiling protrude into a room?

A

1in to 2in without a bend

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30
Q

How high should a cable tray located within the ceiling be placed when it protrudes into a room?

A

8ft

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31
Q

What is the minimum size and number of sleeves to be used for backbone pathways for a TR, ER or EF?

A

At least four 4” sleeves

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32
Q

How should multiple telecommuncations spaces on the same floor be interconnected?

A

At least two 4” conduits or equivalent sized pathway

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33
Q

True or False
Doors for telecommunications spaces are permitted to have a lower fire rating than the rest of the room

A

False

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34
Q

What should be the focus of the fire protection system?

A

Prevention, early warning and containment

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35
Q

Where should light switches be located in telecommunications spaces?

A

Near the entrance to the space

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36
Q

True or False
Dimmers and vacancy sensors are recommended for reducing energy consumption in telecommunications spaces

A

False

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37
Q

How much light should be provided within the telecommunications space?

A

46 FC measured between racks

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38
Q

Where should light fixtures be located in telecom spaces?

A

Minimum 8.5ft AFF and coordinated with rack layout

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39
Q

How should telecom spaces in multi floor buildings be aligned?

A

Stacked

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40
Q

What is an advantage of using one or more load-bearing walls to build the telecom space?

A

reduces the possibility of relocating the space if the building is altered or expanded in the future

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41
Q

What is the purpose of locating a telecom space as near as possible to the center of the area to which it will provide connectivity?

A

Minimizes cable runs

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42
Q

What are the minimum interior dimensions of a telecom space if the serving area is 5000ft2 or less?

A

10ft x 8ft

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43
Q

What are the minimum interior dimensions of a telecom space if the serving area is larger than 5000ft2 and less than or equal to 8000ft2

A

10ft x 9ft

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44
Q

What are the minimum interior dimensions of a telecom space if the serving area is larger than 8000ft2 and less than or equal to 10000ft2

A

10ft x 11ft

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45
Q

Where are small rooms permitted to serve as telecom spaces?

A

In buildings smaller than 5000ft2

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46
Q

Name three types of cabinets that may serve a building that is smaller than 1000ft2

A
  • Wall Cabinet
  • Self contained cabinet
  • Enclosed cabinet
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47
Q

If minimum size guidelines cannot be met for reasons outside the control of the ICT designer, what space guidelines should be followed instead?

A

Provide 4ft deep x 6ft wide x 8.5ft high for every 240 terminations served

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48
Q

How much termination space should be allocated for balanced twisted pair cables utilizing patch panel connections?

A

4 sq in for each 4pair circuit to be patched or cross connected

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49
Q

How much termination space should be allocated for optical fiber cables?

A

2 sq in for each optical fiber strand to be patched or cross connected

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50
Q

How much termination space should be allocated for coaxial cables?

A

2 sq in for each coaxial cable to be patched or cross connected

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51
Q

How much additional termination space may need to be allocated for the proper routing of cables, jumpers, equipment cords and patch cords?

A

Up to 20% more space

52
Q

Name the three factors that determine how much additional termination space is needed for proper cable routing

A
  • Mounting scheme used
  • Type and layout of connecting hardware used
  • Active equipment
53
Q

Name three forms of protection against containments in telecom spaces

A
  • vapor barriers
  • positive room pressure
  • absolute filters
54
Q

how much clear space should be above and below the top and bottom of the connecting hardware for cable management

A

5in

55
Q

what is the maximum length for patch cords, equipment cords or jumpers in an HC (FD)

A

16.5ft (5m)

56
Q

What is the maximum total length for patch cords/jumpers, equipment cords connected to the HC (FD)

A

33ft (10m)

57
Q

What is the maximum length for patch cords or jumpers that serve the MC (CD) or IC (BD)?

A

66ft (20m)

58
Q

What is the recommended height for racks, cabinets and enclosure?

A

7ft

59
Q

How many walls in a telecom space should be lined with AC grade or better void free plywood?

A

At least two

60
Q

How high should plywood be mounted in a telecommunications space?

A

8in AFF

61
Q

what type of telecom space is defined as an enclosed architectural space for housing telecom equipment, cable terminations and cross-connect cabling?

A

Telecommunications Room (TR)

62
Q

What type of telecom space is defined as a case or housing for telecom equipment, cable terminations, and cross-connect cabling?

A

Telecommunications Enclosure (TE)

63
Q

True or False
A TR is limited to serving one tenant?

A

False

64
Q

True or False
There is no maximum number of TRs or TEs that may be provided in a building

A

True

65
Q

Name the three types of cabling facilities that may be housed in a TR

A
  • HC (FD)
  • IC (BD)
  • MC (CD)
66
Q

Which type of cabling facility is used to make connections to the horizontal cabling in the TR and TE?

A

HC (FD)

67
Q

true or false
an EF may contain a TR

A

True

68
Q

What is the minimum number of TRs for a floor that does not contain an ER?

A

At least one

69
Q

What is a shallow room?

A

an enclosed space for housing cable terminations, cross-connect cabling and telecommunications equipment

70
Q

How many dedicated non-switched duplex receptacles should be available for equipment power in each TE?

A

A minimum of 1

71
Q

What is the minimum light requirement for a TE?

A

50 fc

72
Q

What is the maximum area that should be served by a single TE?

A

3600 sq ft

73
Q

What is an equipment room?

A

An environmentally controlled centralized space for telecommunications equipment that usually houses and MC (CD) or an IC (BD)

74
Q

How do ERs differ from TRs?

A

ERs are generally considered to serve a building, campus, tenant or SP whereas TRs serve a floor area of a building

75
Q

Name four reasons a building would contain multiple ERs

A

To provide one or more of the following:
- Separate facilities for different types of equipment and services
- Redundant facilities and disaster recovery strategies
- A separate facility for each tenant in a multi tenant building
- A separate facility for each access provider (AP) and service provider (SP)

76
Q

True or False
An ER may provide any or all of the functions of a TR or an EF

A

True

77
Q

Name three components commonly found in an ER

A
  • Active equipment
  • Cross-connect facilities
  • BASs or other building system equipment
78
Q

Name five types of an apparatus typically housed in an ER

A
  • Power conditioning and backup systems
  • Environmental controls
  • Telecom equipment
  • Fire suppression or smoke/heat detection systems
  • Access Control Systems and Intrusion Detection Systems
79
Q

Name the four most common types of backbone cabling/media

A
  • balanced twisted pair
  • multimode optical fiber
  • singlemode optical fiber
  • coaxial
80
Q

Name the five factors to consider when performing an initial assessment of an ER design

A
  • Customer requirements
  • Telecom pathway locations
  • Access Provider (AP) and service provider (SP) requirements
  • Environment/facility conditions and resources
  • Building requirements
81
Q

What is the most basic step in planning and ER?

A

Selecting a suitable location

82
Q

Name the two factors that generally dictate the amount of space allocated for the ER

A
  • size and variety of systems to be installed
  • size of the area that the room will serve
83
Q

True or False
Layouts for cabling pathways are generally determined after the location of ERs, EFs and TRs are established

A

True

84
Q

If a separate access provider (AP) space is required, where should it be located?

A

In or adjacent to the EF

85
Q

How much space should be allocated for each access provider (AP) in an EF?

A

At least 4ft x 6ft

86
Q

Name the two benefits of location the ER near the electrical service entrance

A
  • Aids in designing an optimal bonding and grounding (earthing) arrangement
  • Minimizes bonding and grounding (earthing) disturbances
87
Q

Who controls the access to an ER that is shared by multiple tenants?

A

The building owner or agent

88
Q

True or False
Whenever practicable, the ER should be located next to the mechanical room

A

False, an ER should not be located adjacent to a mechanical room

89
Q

What is the minimum amount of floor space that should be allocated for an ER?

A

10ft x 16ft

90
Q

What can the ICT designer use to determine the minimum size of the ER if the specific equipment that will be used is unknown?

A

The amount of floor space that the ER will serve

91
Q

What industry average is used to calculate space for work areas?

A

100 sqft

92
Q

What is the minimum permitted size for an ER that will serve fewer than 200 work areas?

A

150 sqft

93
Q

Name five factors that are used to determine the minimum working clearance around equipment in the ER

A
  • Voltage
  • Exposure of live parts
  • Equipment orientation
  • AHJ
  • Location of grounded parts
94
Q

How much floor area is typically required for equipment cabinets in an ER?

A

10 sqft of floor area plus an additional 10 sqft for working clearance

95
Q

What types of cable pathways are commonly used to route bulk cables within the ER?

A
  • Cable tray or ladder rack
  • Access Floors
96
Q

What is the minimum amount of access headroom that is required when a cable tray system is installed in an ER?

A

8in

97
Q

What is the recommended amount of access headroom for a cable tray system that is installed in an ER?

A

12in

98
Q

True or False
All cable must be plenum rated when cooling or return air is provided under access flooring

A

True

99
Q

Name two characteristics of strapping, hooking and lashing that make them unsuitable (typically) for being the primary means of cable distribution within an ER

A
  • limited bulk cable capacity
  • Inablility to accommodate change
100
Q

What types of cable pathways are commonly used to allow telecommunications cables to enter and exit the ER?

A
  • slots and sleeves
  • conduits
101
Q

Sleeves and slots are the most common method for routing cable through building walls and floors. Why are sleeves preferred?

A

Sleeves are easier to firestop

102
Q

How many sleeves should be provided to run cable to an ER?

A

A minimum of four 4” sleeves with at least one spare sleeve

103
Q

Why should sleeves and slots be specified before the building is constructed?

A

Because cutting holes in existing concrete:
- is expensive
- can create dust and water damage
- can compromise structural integrity

104
Q

What is the purpose of using a bushing on the end of a conduit?

A

avoids damaging the cable sheath

105
Q

What components should be used if cable bends will be required near a conduit?

A

cable sheaves

106
Q

Name three reasons conduits are not recommended for use in an ER unless they are required by code

A
  • Expensive
  • Limited bulk capacity
  • Accommodate change poorly
107
Q

Why should ER cross-connects be located near the end of the backbone pathways?

A

minimizes the need for cable routing in the ER

108
Q

True or False
The ICT designer is usually responsible for designing and installing electrical power equipment in the ER

A

False

109
Q

Name five components that can be used to protect an ER from power flucuations

A
  • dedicated branch circuits
  • dedicated power feeders
  • power conditioning
  • backup power
  • effecting grounding and bonding
110
Q

What does a dedicated branch circuit serve?

A

A single outlet

111
Q

Why should an electrical power quality audit be performed before telecommunications equipment is installed?

A

To assess the need for additional power conditioning

112
Q

True or False
Backup power is strongly recommended for ERs

A

True

113
Q

Name three environmental requirements for telecom equipment

A
  • Temperature control
  • Humidity control
  • Dust and containment control
114
Q

Limit changes in temperature and humidity to around __ percent

A

Limit changes in temperature and humidity to around one percent

115
Q

Where should HVAC sensors and controls be located in an ER?

A

5ft AFF

116
Q

Name six alarms that should be installed (at a minimum) for the HVAC system for an ER

A
  • AC power loss
  • High and low temperature
  • High and low humidity
  • Smoke Detection
  • Compressor failure
  • Water flooding
117
Q

What is condensate

A

Moisture obtained through the air during the dehumidification process

118
Q

How often should belts and filters be checked as part of routine maintenance for the HVAC system in an ER?

A

Every 6 months minimum

119
Q

What should the ICT designer do to ensure that the warranties on equipment remain in force?

A

Follow manufacturers instructions and requirements exactly

120
Q

What should the ICT designer do in cases where site constraints make it impossible to follow the manufacturers instructions or requirements?

A

Consult the manufacturer for alternates that will not void the warranty and ask for acknowledgement in writing

121
Q

What should the ICT designer check after equipment installation for the ER is complete?

A
  • Workmanship for safety, standards and code compliance
  • Cleanup
  • Compliance with construction documents
122
Q

What is an entrance facility (EF)?

A

Entrance to a building for public and private network service media

123
Q

True or False
EFs must be located in a separate room from the ER

A

False

124
Q

Name three elements included in a service entrance

A
  • path that telecom entrance facilities follow on private or public property
  • single or multiple EPs to the building
  • termination point or DP
125
Q

Name four factors that influence the type and location of the entrance that will be used

A
  • type of facility being used
  • path the facility follows
  • building architecture
  • aesthetics
126
Q

Name four types of media that can enter an EF

A
  • balanced twisted pair copper
  • coaxial
  • optical fiber
  • wireless
127
Q

Name the three types of OSP facilities that can be used for a service entrance

A
  • Underground
  • Direct buried
  • Aerial

DB (19 decks)

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