Chapter 3 Flashcards
Access Provider (AP)
1 .A company (e.g., telephone
company) that provides a circuit
path between a service provider
(SP) and the client user. An AP
also can be the SP.
2. The operator of any facility
that is used to convey
telecommunications signals to
and from a client premises.
TDMM.* Page G-4
ACS
Access Control System
An interconnected set of
controllers managing the
entrance and exit of people
through secure areas.
TDMM.* Page G-3
AHJ
Authority Having Jurisdiction
The building official, electrical
inspector, fire marshal, or other
individuals or entities
responsible for interpretation
and enforcement of local
building and electrical codes.
TDMM.* Page G-14
BAS
Building Automation System
A control system consisting of
hardware (e.g., controllers, optical
fiber cabling, input/output devices)
and a software application or suite
of software applications that
automate the electrical,
mechanical, or other building and
facility subsystems.
TDMM: Page G-24
Demarcation Point
(Demarc or DP)
1 .A point where the operational
control or ownership changes.
(TIA)
2. The point of interface between
service providers (SPs) and
client facilities. Also referred to
as minimum point of entry
(MPOE).
TDMM.* Page G-54
EF
Entrance Facility
An entrance to a building for both
public and private network service
media, including wireless. This
includes the entrance point (EP) at
the building wall or floor, the
conduit or pathway, and continuing
on to the entrance room or space.
TDMM.* Page 3-52
EP
Entrance Point
The point of emergence for
telecommunications cabling
through an exterior wall, a floor,
or from a conduit. (TIA)
TDMM.* Page G-71
ER
Equipment Room
An environmentally controlled
centralized space for
telecommunications equipment
that usually houses an MC (CD)
TDMM.* Page 3-28
HC (FD)
Horizontal Cross-Connect
(Floor Distributor)
A group of connectors (e.g.,
patch panels, punch-down
blocks) that allow horizontal,
backbone, and equipment
cabling to be cross-connected
with patch cords or jumpers.
TDMM.* Page G-93
IC (BD)
Intermediate Cross-Connect
(Building Distributor)
The connection point between a
backbone cable that extends from
the main cross-connect (MC
[campus distributor (CD)] first-level
backbone) and the backbone cable
from the horizontal cross-connect
(HC [floor distributor (FD)] second-
level backbone).
TDMM.* Page G-100
MC (CD)
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 G-115
Service Provider (SP)
The operator of any service that
furnishes telecommunications
content (transmissions)
delivered over access provider
facilities. (T IA)
TDMM: Page G-173
TE
Telecommunications Enclosure
A case or housing for
telecommunications equipment,
cable terminations, and cross-
connect cabling.
TDMM.* Page 3-19
TR
Telecommunications Room
An enclosed architectural space
for housing telecommunications
equipment, cable terminations,
and cross-connect cabling.
TDMM.* Page 3-19
How are
telecommunications
spaces defined?
As rooms and areas where
telecommunications cabling
systems are terminated, cross
connected, and interconnected
to installed telecommunications
equipment
TDMM.* Page 3-1
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?
This type of access will limit
interruption to the building
tenants. Service for one tenant
will not interrupt the
other tenants.
TDMM: Page 3-1
Who should have access to a
locked telecommunications
space, area, or room?
*The owner’s maintenance
personnel
*Building management
*Common key/access control
credential holders
Each tenant
TDMM. Page 3-1
Name 2 strategies to limit
acoustic noise levels in a
telecommunications space.
1 .Locate noise-generating
equipment outside the
telecommunications space
whenever possible
2.Specify the use of sound barriers
if sources of unacceptable noise
cannot be located outside the
telecommunications space
TDMM.* Page 3-2
What should be the
minimum ceiling height in a
telecommunications
space?
-2.4 m (8 ft) AFF
TDMM.* Page 3-3
What is the recommended ceiling
height to consider using in a
telecommunications space?
-3 m (10 ft) AFF
TDMM.* Page 3-3
True or False
Suspended ceilings are
preferred in
telecommunications
spaces.
False. Suspended ceilings are
not recommended in
telecommunications spaces
unless they are part of the
air cooling strategy.
TDMM.* Page 3-3
Name 2 potential negative
consequences of installing
excessively tall equipment or
racks in a telecommunications
space.
1 .May require special lighting
2.May require wider working
clearances
TDMM.* Page 3-3
Why is it important to
select a ceiling finish
that is light colored?
It enhances the room lighting.
TDMM.* Page 3-3
How much clearance
should be provided for the
installation and
maintenance of cabling
that is mounted on a wall?
-1 m (3.28 ft)
TDMM.* Page 3-3
What is the minimum
recommended depth that
should be provided for wall-
mounted equipment?
-150 mm (6 in)
TDMM.* Page 3-3
How much working
clearance (front and rear)
should be provided around
installed equipment?
-1 m (3.23 ft)
TDMM.* Page 3-3
What is the minimum
recommended side clearance
when equipment will be
mounted in the corners of a
telecommunications space?
-300 mm (12 in)
TDMM.* Page 3-3
True or False
If possible, sleeves, slots,
and conduits should be
located where they permit
cable terminations to be
performed from left to right.
True. If possible, sleeves, slots,
and conduits should be located
where they permit cable
terminations to be performed
from left to right.
TDMM.* Page 3-4
How far should a cable tray
located within the ceiling
protrude into a room?
05.4 mm (1 in) to mm (2 in)
without a bend
TDMM.* Page 3-4
How high should a cable
tray located within the
ceiling be placed when it
protrudes into a room?
Above -2.4 m (8 ft) high
TDMM.* Page 3-4
What is the minimum size
and number of sleeves to
be used for backbone
pathways for a TR, ER or EF?
At least four
103 mm (4 trade size) sleeves
TDMM.* Page 3-4
How should multiple
telecommunications
spaces on the same floor
be interconnected?
By at least two 103 mm (4 trade size)
conduits or a pathway that provides
equivalent capacity
TDMM.* Page 3-4
True or False
Doors for telecommunications
spaces are permitted to have a
lower fire rating than the
rest of the room.
False. Doors shall have the
same fire rating as the room.
TDMM.* Page 3-5
What should be the focus of
the fire protection system?
Prevention, early warning,
and containment
TDMM.* Page 3-7
Where should light
switches be located in
telecommunications
spaces?
Near the entrance to the space
TDMM.* Page 3-9
True or False
Dimmers and vacancy
sensors are recommended
for reducing energy
consumption in
telecommunications
spaces.
False. Dimmers and vacancy
sensors are not recommended
for use in telecommunications
spaces.
TDMM.* Page 3-9
How much light should be
provided within the
telecommunications
space?
-500 lx (46 foot-candles) in the
horizontal plane and
=200 lx (18.6 foot-candles) in
the vertical plane, measured
zl m (3.28 ft) AFF in the middle
of all aisles between cabinets
and racks
TDMM.* Page 3-9
Where should light
fixtures be located in
telecommunications
spaces?
A minimum of 0.6 m (8.5 ft) AFF
when possible and closely
coordinating with rack, cabinet or
enclosure placements
TDMM.* Page 3-9
How should
telecommunications
spaces in multi-floor
buildings be aligned?
Vertically aligned (stacked)
TDMM.* Page 3-9
What is an advantage of
using one or more load-
bearing walls to build the
telecommunications space?
Using one or more load-bearing
walls reduces the possibility of
relocating the space if the floor
or building is expanded or
altered in the future.
TDMM.* Page 3-9
What is the purpose of
locating a telecommunications
space as near as possible to
the center of the area to which
it will provide connectivity?
It minimizes the cable lengths
(between the space and
the work areas).
TDMM.* Page 3-9
What are the minimum
interior dimensions of a
telecommunications space
if the serving area is
—465 m2 (5000 ft2) or less?
-3 m (10 ft) by -2.4 m (8 ft)
TDMM.* Page 3-11, Table 3.1
What are the minimum
interior dimensions of a
telecommunications space
if the serving area is larger
than -465 m2 (5000 ft2)
and less than or equal to
-743 m2 (8000 ft2) ?
-3 m (10 ft) by -2.74 m (9 ft)
TDMM.* Page 3-11, Table 3.1
What are the minimum
interior dimensions of a
telecommunications space
if the serving area is larger
than -743 m2 (8000 ft2)
and less than or equal to
-929 m2 (10,000 ft2) ?
-3 m (10 ft) by -3.4 m (11 ft)
TDMM.* Page 3-11, Table 3.1
Where are shallow rooms
permitted to serve as
telecommunications
spaces?
In buildings that are smaller than
-465 m2 (5000 ft2)
TDMM.* Page 3-11, Table 3.2
Name 3 types of cabinets that
may serve a building that is
smaller than 93 m2 (1000 ft2).
1 .Wall cabinets
2.Self-contained cabinets
3.Enclosed cabinets
TDMM.* Page 3-11, Table 3.2
If minimum size guidelines
cannot be met for reasons
outside the control of the
ICT designer, what space
guideline should be
followed instead?
If minimum space guidelines
cannot be met, provide
-1.2 m (4 ft) depth by
1 .83 m (6 ft) width by
-2.6 m (8.5 ft) height
(inside dimensions)
for every 240 four-pair cable
terminations served.
TDMM.* Page 3-11
How much termination
space should be allocated
for balanced twisted-pair
cables utilizing patch panel
connections?
-2580 mm2 (4 in2) for each
4-pair circuit to be patched or
cross connected
TDMM.* Page 3-12, Table 3.3
How much termination
space should be allocated
for optical fiber cables?
-1290 mm2 (2 in2) for each
optical fiber core/strand to be
patched or cross connected
TDMM.* Page 3-12, Table 3.3
How much termination
space should be allocated
for coaxial cables?
-1290 mm2 (2 in2) for each
coaxial cable to be patched or
cross connected
TDMM.* Page 3-12, Table 3.3
How much additional
termination space may
need to be allocated for the
proper routing of cables,
jumpers, equipment cords,
and patch cords?
Up to 20 percent more space
Page 3-12
Name 3 factors that
determine how much
additional termination
space is needed for proper
cable routing.
1 .Mounting scheme used
2. Type and layout of connecting
hardware used
3.Active equipment
TDMM.* Page 3-12
Name 3 forms of
protection against
contaminants in
telecommunications
spaces.
1 . Vapor barriers
2. Positive room pressure
3. Absolute filters
TDMM.* Page 3-13
How much clear space
should be above and below
the top and bottom of the
connecting hardware for
cable management?
=127 mm (5 in)
TDMM.* Page 3-14
What is the maximum
length for patch cords,
equipment cords, or
jumpers in an HC (FD)?
-5 m (16.5 ft)
TDMM.* Page 3-74
What is the maximum
length total length for patch
cords/jumpers, equipment
cords connected to
the HC (FD)?
-10 m (33 ft)
TDMM.* Page 3-14
What is the maximum
length for patch cords or
jumpers in addition to the
work area equipment cord
that serves the
MC (CD) or IC (BD)?
-20 m (66 ft)
TDMM.* Page 3-14
What is the recommended
height for racks, cabinets,
and enclosures?
—2.1 m (7 ft)
TDMM.* Page 3-14
How many walls in a
telecommunications space
should be lined with AC
grade or better, void-free
plywood?
At least 2
TDMM.* Page 3-16
How high should plywood
be mounted in a
telecommunications
space?
-200 mm (8 in) AFF
TDMM.* Page 3-76
What type of
telecommunications space is
defined as an enclosed
architectural space for housing
telecommunications equipment,
cable terminations, and cross-
connect cabling?
Telecommunications room (T R)
TDMM.* Page 3-19
What type of
telecommunications space
is defined as a case or
housing for
telecommunications
equipment, cable
terminations, and cross-
connect cabling?
Telecommunications enclosure
TDMM.* Page 3-19
True or False
A TR is limited to serving
one tenant.
False. A TR may serve only one
tenant, or it may serve
multiple tenants.
TDMM.* Page 3-19
True or False
There is no maximum
number of TRs or TES that
may be provided in a
building.
True. There is no maximum
number of TRs or TES that may
be provided in a building.
TDMM.* Page 3-19
Name the 3 types of
cabling facilities that may
be housed in a TR.
1.HCs (FDs)
2.ICs (BDs)
3.MCs (CDs)
TDMM.* Page 3-19
Which type of cabling
facility is used to make
connections to the
horizontal cabling in the TR
and the TE?
HC (FD)
TDMM.* Page 3-19
True or False
An EF may contain a TR.
True. An EF may contain a TR.
TDMM.* Page 3-20
What is the minimum
number of TRs for a floor
that does not contain
At least one. There shall be at
least one TR or ER per floor.
TDMM.* Page 3-21
What is a shallow room?
An enclosed space for
housing cable terminations,
cross-connect cabling, and
telecommunications equipment
TDMM.* Page 3-25
How many dedicated, non-
switched duplex
receptacles should be
available for equipment
power in each TE?
A minimum of 1
TDMM.* Page 3-26
What is the minimum light
requirement for a T E?
-538 lux (50 foot-candles)
TDMM.* Page 3-27
What is the maximum area
that should be served
by a single TE?
-334 m2 (3600 ft2)
TDMM.* Page 3-27
What is an equipment room?
An environmentally controlled
centralized space for
telecommunications equipment
that usually houses an MC (CD)
or an IC (BD)
TDMM.* Page 3-28
How do ERs differ
from TRs?
ERs are generally considered to
serve a building, campus, tenant,
or SP, whereas TRs serve a floor
area of a building.
TDMM.* Page 3-28
Name 4 reasons a building
would contain multiple ERs.
To provide one or more of the following:
1 .Separate facilities for different types of
equipment and services
2.Redundant facilities and disaster
recovery strategies
3.A separate facility for each tenant in a
multi-tenant building
4.A separate facility for each access
provider (AP) and service provider (SP)
TDMM.* Page 3-28
True or False
An ER may provide any or
all of the functions of a TR or an EF
True. An ER may provide any or all
of the functions of a TR or an EF.
TDMM.* Page 3-29
Name 3 components
commonly found in an ER.
1 .Active equipment
2.Cross-connect facilities
3.BASs or other building system
equipment
TDMM.* Page 3-30
Name 5 types of apparatus
typically housed in an ER.
1 .Power conditioning and backup
systems
2.Environmental controls
3.Telecommunications equipment
4.Fire suppression or smoke/heat
detection systems
5.Access control systems (ACSs)
and intrusion detection systems
(IDSs)
TDMM.* Page 3-30
Name the 4 most common
types of backbone
cabling/media.
1 .Balanced twisted-pair
2.Multimode optical fiber
3.Singlemode optical fiber
4.Coaxial
TDMM.* Page 3-37
Name 5 factors to consider
when performing an initial
assessment of an
ER design.
1 .Customer requirements
2. Telecommunications pathway
locations
3.Access provider (AP) and service
provider (SP) requirements
4. Environment/facility conditions
and resources
5.Building requirements
TDMM.* Page 3-31
What is the most basic
step in planning an ER?
Selecting a suitable location
TDMM.* Page 3-32
Name the 2 factors that
generally dictate the
amount of space allocated
for the ER.
1 .Size and variety of systems to
be installed
2.Size of the area that the room
will serve
TDMM.* Page 3-32
True or False
Layouts for cabling
pathways are generally
determined after the
location of ERs, EFs, and
TRs are established.
True. Layouts for cabling
pathways are generally
determined after the location of
ERs, EFs, and TRs are
established.
TDMM.* Page 3-33
If a separate access
provider (AP) space is
required, where should
it be located?
In or adjacent to the EF
Note: It may require a mesh
partition or locked cabinet.
TDMM.* Page 3-33
How much space should be
allocated for each access
provider (AP) in an EF?
At least 1.2 m by -1.83 m
(4 ft by 6 ft)
TDMM.* Page 3-33
Name 2 benefits of locating
the ER near the electrical
service entrance.
1 .Aids in designing an optimal
bonding and grounding
(earthing) arrangement
2.Minimizes bonding and
grounding (earthing)
disturbances
TDMM.* Page 3-35
Who controls the access to
an ER that is shared by
multiple tenants?
The building owner or agent
TDMM.* Page 3-35
True or False
Whenever practicable, the
ER should be located next
to the mechanical room.
False. An ER should not share
space or be located adjacent to
a mechanical room or any other
space that is subject to any
adverse environmental
conditions.
TDMM.* Page 3-36
What is the minimum
amount of floor space that
should be allocated
for an ER?
-3 m (10 ft) by -4.9 m (16 ft)
TDMM.* Page 3-37
What can the ICT designer
use to determine the
minimum size of the ER if
the specific equipment that
will be used is unknown?
The amount of floor space that
the ER will serve
TDMM.* Page 3-39
What industry average is
used to calculate space for
work areas?
-9.3 m2 (100 ft2)
TDMM.* Page 3-39, step 1, NOTES
What is the minimum size
permitted for an ER that
will serve fewer than
200 work areas?
-15 m2 (1 60 ft2)
TDMM.* Page 3-39
Name 5 factors that are
used to determine the
minimum working
clearance around
equipment in the ER.
1 . Voltage
2.Exposure of live parts
3.Equipment orientation
4.AHJ
5.Location of grounded parts
TDMM.* Page 3-40
How much floor area is
typically required for
equipment cabinets
in an ER?
-0.9 m2 (10 ft2) of floor area plus
an additional =0.9 m2 (10 ft2) for
working clearance
TDMM.* Page 3-40
What types of cable
pathways are commonly
used to route bulk cables
within the ER?
*Cable tray or ladder rack systems
Access floors (raised floors)
TDMM. Page 3-42
What is the minimum
amount of access
headroom that is required
when a cable tray system is
installed in an ER?
-203 mm (8 in)
TDMM.* Page 3-42
What is the recommended
amount of access headroom
for a cable tray system the is
installed in an ER?
-305 mm (12 in)
TDMM.* Page 3-42
True or False
All cable must be plenum
rated when cooling or
return air is provided under
access flooring.
True. When cooling or return air
is provided under access
flooring, all cabling must be
plenum rated.
TDMM.* Page 3-42
Name 2 characteristics of
strapping, hooking, and
lashing that make them
unsuitable (typically) for
being the primary means of
cable distribution
within an ER.
1 .Limited bulk cable capacity
2.Inability to accommodate change
TDMM.* Page 3-43
What types of cable pathways
are commonly used to allow
telecommunications cables to
enter and exit the ER?
*Slots and sleeves
Conduits
TDMM. Page 3-44
Sleeves and slots are the
most common method for
routing cable through
building walls and floors.
Why are sleeves preferred?
Sleeves are preferred because
they are easier to firestop.
TDMM.* Page 3-44
How many sleeves should
be provided to run cable
A minimum of four 103 mm
(4 trade size) sleeves with at
least one spare Sleeve
TDMM.* Page 3-44
Why should sleeves and
slots be specified before
the building is constructed?
Because coring (cutting) holes
through existing concrete:
*Is expensive
*Can create dust or water damage
Can compromise structural
integrity
TDMM. Page 3-44
What is the purpose of
using a bushing on the
end of a conduit?
It helps to avoid damaging
the cable sheath.
TDMM.* Page 3-44
What component should be
used if cable bends will be
required near a conduit?
Cable sheaves
TDMM.* Page 3-44
Name 3 reasons conduits are
not recommended for use in
an ER unless they are
required by code.
They are generally not
recommended because they:
*Are expensive
*Have limited bulk capacity
Accommodate change poorly
TDMM. Page 3-44
Why should ER cross-connects
be located near the end of the
backbone pathways?
Because it will minimize the
need for cable routing in the ER
TDMM.* Page 3-44
True or False
The ICT designer is usually
responsible for designing
and installing electrical
power equipment in the ER.
False. The ICT designer is
usually not responsible for
designing and installing
electrical power equipment;
however, the ICT designer shall
be capable of specifying
electrical power requirements
for the ER.
TDMM.* Page 3-45
Name 5 components that
can be used to protect an ER
from power fluctuations.
1 .Dedicated branch circuits serving
individual outlets
2.Dedicated electrical power
feeders
3.Power conditioning
4.Backup power
5. Effective telecommunications
bonding and grounding (earthing)
infrastructure
TDMM.* Page 3-45
What does a dedicated
branch circuit serve?
A single outlet utilizing a
dedicated phase, neutral, and
ground conductor
TDMM.* Page 3-46
Why should an electrical
power quality audit be
performed before
telecommunications
equipment is installed?
To assess the need for
additional power conditioning
TDMM.* Page 3-47
True or False
Backup power is strongly
recommended for ERs.
True. Because of the mission
critical nature of the ER, it is
strongly recommended that
backup power be provided in the
event of power failure.
TDMM.* Page 3-47
Name 3 environmental
requirements for
telecommunications
equipment.
1 . Temperature control
2.Humidity control
3.Dust and containment control
TDMM.* Page 3-48
Limit changes in
temperature and humidity
to around — percent.
Limit changes in
temperature and humidity to
around 1 percent.
TDMM.* Page 3-49
Where should HVAC
sensors and controls be
located in an ER?
Ideally -1.52 m (5 ft) AFF
TDMM.* Page 3-49
Name 6 alarms that should
be installed (at a minimum)
for the HVAC system
for an ER.
1 .ac Power loss
2.High and low temperature
3.High and low humidity
4.Smoke detection
5.Compressor failures
6.Water flooding
TDMM.* Page 3-49
What is condensate?
Moisture obtained through the
air during the dehumidification
process
TDMM.* Page 3-49
How often should belts and
filters be checked as part
of routine maintenance for
the HVAC system in an ER?
At least every 6 months
TDMM.* Page 3-49
What should the ICT
designer do to ensure that
the warranties on
equipment remain in force?
The ICT design should follow the
manufacturer’s instructions and
requirements exactly to ensure that
the warranties remain in force.
TDMM.* Page 3-50
What should the ICT design
do in cases where site
constraints make it
impossible to follow the
manufacturer’s instructions
or requirements?
Consult the manufacturer
about alternatives that will
not void the warranty; then ask
that the manufacturer
acknowledge any acceptable
alternatives in writing.
TDMM.* Page 3-50
What should the ICT
designer check after
equipment installation for
the ER is complete?
*Workmanship for safety,
standards, and code
compliance
*Cleanup
Compliance with construction
documents
TDMM. Page 3-51
What is an
entrance facility (EF)?
An entrance to a building for
both public and private network
service media, including
wireless. This includes the
entrance point (EP) at the
building wall or floor, the conduit
or pathway, and continuing on to
the entrance room or space.
TDMM.* Page 3-52
True or False
EFS must be located in a
separate room from the ER.
False. An EF may be located in a
separate room or within the ER.
TDMM.* Page 3-52
Name 3 elements included
in a service entrance.
1 .Path that telecommunications
entrance facilities follow on
private or public property
2.Single or multiple EPs to the
building
3. Termination point or DP
TDMM.* Page 3-52
Name 4 factors that
influence the type and
location of the entrance
that will be used.
1 . Type of facility being used
2.Path the facility follows
3.Building architecture
4.Aesthetics
TDMM.* Page 3-52
Name 4 types of media
that can enter an EF.
1 .Balanced twisted-pair copper
2.Coaxial
3.Optical fiber
4. Wireless
TDMM.* Page 3-53
Name 3 types of OSP
facilities that can be used
for a service entrance.
1 .Underground
2.Direct-buried
3.Aerial
TDMM.* Page 3-53
