Chapter 12 Flashcards
Easement
A right acquired by one party to
use land belonging to another
party for a specific purpose.
TDMM.* Page G-65
HH
Handhole
A structure similar to a small
cable can be pulled, but not
large enough for a person to
fully enter to perform work.
TDMM.* Page G-90
Innerduct
A non-metallic duct, either
circular or fabric mesh, placed
within a larger pathway. (T IA)
TDMM.* Page G-97
MH
Maintenance Hole
1 .A vault located in the around or
earth as part of an underground duct
system and used to facilitate placing,
splicing, and maintenance of cables,
as well as the placing of associated
equipment, in which it is expected
that a person will enter to perform
work.
2.A hole through which access to an
underground or enclosed structure
may be gained.
TDMM.* Page G-116
NI
Network Interface
The point of connection between
the AP network and private
network. Also referred to as the
demarcation point or DP.
TDMM: Page 12-23
OSP
Outside Plant
1 . Telecommunications
infrastructure designed for
installation exterior to buildings
and is typically routed into the
entrance facility. (TIA)
2.Communications infrastructure
outside of the buildings/premises
using underground conduits and
vaults, direct-buried cable, aerial
plants, and wireless.
TDMM.* Page G-135
Service Diversity
The placing of alternate facilities
to temporarily replace the main
system in case of failure.
TDMM.* Page 12-17
Underground
Facilities
Cables that are placed in
subsurface conduits using MHS,
handholes, and/or pull boxes as
access points to the cable.
TDMM.* Page 12-1
Name 3 critical factors to
consider when planning for
maintenance and future
growth for a property where
campus backbone
cables exist.
1 .Familiarity with the routes and
spaces
2.Working capacity versus spare
cable capacity
3.Cable composition
TDMM.* Page 12-1
Name 5 advantages of
underground conduits.
- Provide out-of-sight service and maintain the property’s aesthetic appearance
- Are adaptable for future facility placement
or removal without disturbing the property - Are economical over a long life
- Provide additional physical cable protection
- Minimize the need for possible subsequent repairs to the property when growth is required for existing facilities
TDMM.* Page 12-1
Name 4 disadvantages of
underground conduits.
- Have a high initial installation cost
- Require careful route planning
- Provide a possible path for water or gas to enter the building if improperly sealed
- Usually require more installation time than aerial or direct-buried
installations
TDMM.* Page 12-2
Name 3 advantages of
direct-buried cabling.
- Provides out-of-sight service
and maintain the property’s
aesthetic appearance - Usually has a low initial
installation cost - Can easily bypass
obstructions
TDMM.* Page 12-3
Name 2 disadvantages of
direct-buried cabling.
- May be inflexible for future
service reinforcement or
changes - Does not provide physical
protection to the cable sheath
TDMM.* Page 12-3
Name 2 advantages of
aerial pathways.
- Usually can be installed
quickly - Are readily accessible for
maintenance
TDMM.* Page 12-5
Name 5 disadvantages of
aerial pathways.
- Affect the aesthetic appearance of the property
- Are subject to traffic and pedestrian clearances
- Could damage building exterior
- Are susceptible to environmental conditions
- Can be time consuming and expensive if “make ready” is required to attach to poles owned by others
TDMM.* Page 12-5
Name 4 ways to bring
balanced twisted-pair cable
onto a customer’s property.
1 .Underground entrances
2.Buried entrances
3.Aerial entrances
4. Tunnel systems
TDMM.* Page 12-6
What factors are used to
determine how many
conduits and how large the
conduits need to be for a
given telecom
service entrance?
The number, size, and types of
cable to be used to serve the
telecommunications
service entrance
TDMM.* Page 12-6
What are BICSl’s
recommendations for the
number and size of
conduits for each
telecommunications
service entrance point?
Four 103 metric designator
(4 trade size) conduits
with at least one spare
103 metric designator
(4 trade size) conduit
TDMM.* Page 12-6
Why are innerducts
recommended when
optical fiber cables will be
used inside conduits?
Innerducts are used to ensure
that the maximum amount of
cables can be placed in
the conduit.
TDMM.* Page 72-6
Why is a copper conductor
added to a conduit that
contains optical fiber
cabling?
For locating purposes
TDMM.* Page 12-7
Why would an access
provider and customer-
owned cabling need to share
a telecommunications
service entrance?
To reduce installation costs
TDMM.* Page 12-71
Name 3 risks associated
with sharing an entrance
conduit.
- May reduce the access provider’s or the customer’s ability to provide additional cable into the EFS
- Could damage both cable sheaths by abrasion if they are not installed properly
- May not be permitted by the access provider and/or AHJ
TDMM.* Page 12-7
True or False. The AP is
required to build the EF for
any facility where the AP
supplied the conduit from
the property line to
the building.
False. The AP does not have to
build the EF. In fact, in some
instances, the AP may have the
right to require the occupants to
build the EF.
TDMM.* Page 12-7
How many 90-degree
bends can be included
between pulling points
when installing
underground entrances?
No more than 2
TDMM.* Page 72-8
True or False
A 90-degree bend may be
exceeded if innerduct is
included in the conduit.
False. A 90-degree bend should
never be exceeded.
TDMM.* Page 12-8
How many conduits should
a property owner provide
from a point in the building
to the property line if the
building is not on the
property line?
2 or more
TDMM.* Page 12-8
Whom should you call
before digging the pathway
for direct-buried cabling?
The local underground
utilities center
TDMM.* Page 12-9
Name 3 methods that
should be used to prevent a
trench from caving in.
1 .Shoring
2.Sloping
3.Stepping (benching)
TDMM.* Page 12-9
What is the maximum
depth for the lower steps in
a trench that is deeper than
-1.52 m (5 ft)
-1.2 m (4 ft)
TDMM.* Page 12-9
What is the minimum clearance from the edge of an excavated dirt pile to the nearest edge of a stepped trench that is deeper than -1.52 m (5 ft)
=0.6 m (2 ft)
TDMM.* Page 12-9
What should be done to
prevent a sunken trench
appearance after the trench
is refilled with the
excavated dirt?
It should be tamped down, and
the area should be revisited later
to ensure that the trench is solid
with the surrounding
undisturbed earth.
TDMM.* Page 12-9
Name 2 limitations for the use of an aerial entrance in a small building.
1 .Less than 300 pairs and
30.5 m (100 ft) less in length
2.No other telecommunications
facility entrances
TDMM.* Page 12-10
Name 5 problems that
make aerial entrances
“undesirable.”
1 .Lack of mechanical protection for
the facility
2. Effect on the aesthetics of the
building
3.Clearance requirements
4.Storm-loading requirements
5.Possible path of electrical exposure
allowing transient currents to enter
the building
TDMM.* Page 12-10
When an aerial entrance is used, what is the maximum span permitted between the last pole and the building?
-30.5 m (100 ft)
TDMM.* Page 12-10
What is slack span
construction?
A method of aerial cable
installation that reduces tension,
so no guying is required
at either end
TDMM.* Page 12-10
What is one of the main
safety considerations
associated with designing
an aerial entrance?
Ensuring proper clearance and
separation from electrical power
lines and traffic
TDMM.* Page 12-70
When the small-diameter
drop method is used to
attach aerial cable to a
building, what is used to
support the cable?
A drop hook attached to a
conduit mast
TDMM.* Page 72-12
When should the small-
diameter drop method
be used?
When there are only minimal
circuit requirements
TDMM.* Page 12-72
What is the maximum
distance an aerial cable
may extend above the
roof line?
101.6 mm (4 in)
TDMM. Page 12-72
What is a campus
arrangement?
A large tract of land with
multiple buildings rather than
one high-rise building
TDMM.* Page 12-15
