GENERAL ENGINEERING AND APPLIED SCIENCES
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BUILDING TELEPHONE FACILITIES
Service entrance is define as wires or cables entering the building, terminated
to the main cross connecting point within the building from the nearest
telephone facility.
Types of Service Entrance
Aerial entrance – means of providing service aerially from a pole to a
building.
Size of entrance conduit shall not less than 50 mm in diameter.
Recommended initial conduit should be capable of handling the
ultimate telephone requirements of the building.
Generally, the maximum span from telephone pole to a building
should be 30m.
Minimum recommended separation:
Minimum clearances between telephone cable and power
entrance must be 1.0m radial distance.
Minimum clearance from ground level when crossing the street
must be 5.5m.
Minimum clearance over areas accessible to pedestrians only,
must be 3.5m.
Underground service entrance – provide mechanical protection and
minimize the need for possible subsequent repairs to the property.
Corrosion-resistant material/PVC duct.
Should not include more than 2-90degrees bends.
Metallic conduit – to be reamed, bushed and/or capped.
Minimum depth – 600 mm under areas used for vehicular traffic
inside private property.
Conduits placed on private property must not be terminated in jointuse manholes with electrical cables.
Conduits should be separated from power conduits by not less than:
300 mm in well-tamped earth
50 mm of concrete (17,237.5 kPA)
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GENERAL ENGINEERING & APPLIED SCIENCES
The size of underground entrance conduit within the building shall
be the same size as the service conduit outside the building and in
no case smaller than 75 mm in diameter when the service entrance
odes not require use of a service box or when installation requires
placement of conduit between the service box and curb line (toward
the company manhole or pole).
When to Use Handholes
For entrance cable NOT EXCEEDING 50 pairs (0.65 mm in
diameter).
For pull through or straight run entrance cable.
Minimum size of Handholes
For vehicular (meter) – 0.61 x 0.91 x 0.91
For non-vehicular (meter) – 0.61 x 0.91 x 0.73
When to Use Service Box
For entrance cable ABOVE 50 pairs (0.65 mm in diameter).
Minimum size of Service Boxes
For vehicular – 0.19 x 1.23 x 1.21
For non vehicular – 0.91 x 1.22 x 1.19
Note:
Minimum size of entrance conduit = 50 mm diameter
Minimum number of entrance conduits = 2
Main terminals may either be place in an indoor type DP or a cross- connect
point within the building. It is a point where cable from TELCO and the inbuilding distribution system are terminated.
Requirements:
Location should be dry and located as close as possible to the
central point of the riser cable distribution facilities.
Location should be equipped with adequate lighting, and located 2.6
m (min.) above floor finish.
Location should be accessible to authorized company personnel
even during off hours and under lock and key or the terminations
under lockable cover.
Location should have enough working space e in front of all
terminations. Normally 900 mm and away from all hazards.
Location should be closely protected in areas where possible
physical damage may arise.
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GENERAL ENGINEERING AND APPLIED SCIENCES
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Provide with a 12 mm diameter non-metallic conduit to an approved
ground connections, to house the 14 mm2 (4.2 mm diameter)
ground wire.
Types of Main Terminals
Main Telephone Terminal Cabinet (MTTC) – required for terminating
entrance cables using one or more terminal blocks.
Backboard color
White
Yellow
Blue
Terminals to be terminated
Entrance
House / Riser
Other special services (data, computer)
Main Distributing Frame (MDF) – generally recommended when entrance
cable requirements will exceed 300 pairs.
Riser System is define as the vertical and horizontal distribution of telephone
communication lines between two or more floors or adjoining premises on the
same floor of a building generally originating at or near the cabinet up to the
Telephone Terminal or outlet.
Types of Riser System
Open Riser – usually extends from the ground to the roof top of the
building with no floor separation similar to a ventilating shaft. Telephone
cable is not permitted in unless placed in metallic conduit.
Closed Riser – consist of a series of telephone terminal cabinets/closets
vertically or non-vertically aligned, usually beginning at the ground floor
and extending throughout the height of the building. The cabinets/closets
may be interconnected through the floors with the use of a slots, conduits
and pipe sleeves.
Types of Distribution System
Conduit system – provides concealment of the wires with the least
flexibility.
Under floor duct system – comprise of two components, distribution ducts
and feeder (header) ducts. Depending on floor structure, they may be
designed into a one or two-level system.
Ceiling system – serves the same floor where the cables (wires) are
placed within the ceiling and brought down to desk locations.
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GENERAL ENGINEERING & APPLIED SCIENCES
Cellular floor system – comprise of two distinct components, distribution
cells and feeder (header) ducts. Depending on the floor structure, the
distribution cells may be constructed of steel or concrete.
Unlimited access (raised floor) – is a floor assembly elevated with respect
to an existing area providing unlimited accessible space under the floor.
This has been used for computer rooms and office space.
Difference between Cabinet and Closet
Cabinet – is typically a box-type made of steel or fibre glass usually
prefabricated in standard sizes with cover and knockout holes, for in-building
telephone distribution. It is either flush or surface mounted.
Closet – is a room or shallow enclosure which is normally enclosed by a door
(or series of doors in the case of a shallow closet).
Two Basic Types
A shallow closet, which varies from 460 to 760 mm in depth.
A walk-in closet, which is 1200 mm or more in depth.
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GENERAL ENGINEERING AND APPLIED SCIENCES
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DEFINITION OF TERMS
Apparatus Closet
– a suitable enclosure large enough to
house key telephone systems apparatus,
power equipment and terminating
facilities for key telephone systems
stations and sevices, as well as central
closets, zone closets, or riser closets,
according to the design of the underfloor
raceway or riser system.
Building Cable
– refers to the physical cable within a
building. It may include both main cable
pairs and house cable pairs. It does not
include station wiring cable.
– refers to a portion of any building
equipment and rest rooms.
Building Core
Cable
– refers to the assembly of conductors
within a common protective sheath that
permits the use of conductors separately
or in group.
Cellular Floor Raceways
– an assembly of cellular metal or
concrete floor raceways units forming
part of a continuous floor structure.
Cellular Floor Unit
– a load-bearing floor unit containing
one or more longitudinal cells which may
be closed on all sides or open at top or
bottom.
Central Office
–
the
place
where
customer’s
communication lines are terminated and
where the equipment which interconnects
those lines is located.
– refers to the practices and procedures
established by the operating company to
Company Standards
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GENERAL ENGINEERING & APPLIED SCIENCES
install, maintain, move and rearrange
company equipment on private property.
Cordless Switchboard
– a system employing a relay-operated
switchboard through which connections
are made by manually operating lever
keys instead of plug ended cords.
Direct Station
– refers to a station connected to the
company central office through outside
plant facilities and central office system.
Distributing Frame
– a wall or floor-mounted vertical frame of
iron work used to protect and terminate
telephone cable terminals.
Entrance Cable
– refers to the company furnish cable
entering the building from the exchange
cable feed to the main cross connecting
point within the building.
Equipment Room
– a room designed to accommodate
PABX
(Private
Automatic
Branch
Exchange) equipment. On occasion, it
may also include automatic key
telephone
system
apparatus
and
terminating facilities.
Facilities
– refers to equipment, hardware, or
space provided to house communications
systems to operate tenant service.
Floor Closet
– refers to the collecting point designed
to terminate the cable wire and
equipment for a specific floor.
– refers to the portion of a floor area
served by a floor distribution terminal.
Floor Distribution Area
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GENERAL ENGINEERING AND APPLIED SCIENCES
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Floor Distribution Cable
– refers to the branch cable on the
various floors of a building which links the
floor distribution terminals to the riser
cable.
Floor Distribution Terminals
– the terminals in which the floor
distribution cable pairs terminate. They
are located at floor wiring centers.
Header or Feeder Duct
– refers to the raceway of rectangular
cross-section that is placed within or just
below the floor and ties the distribution
duct or cell to the terminal or equipment
space.
Insert
– a circular or ellipsoid cross-section
opening into the distribution duct or cell,
from which the wires or cables emerge.
Local Station
– a station connected to a private
automatic branch exchange.
Poke Through
– a system where cables and/or wires
are placed within the ceiling space and
poked up through the fire resistant floor
structure to the office above.
Private Branch Exchange
System
–
an arrangement of equipment,
consisting of a group of telephone
stations connected with a switchboard or
other
switching
device
providing
telephone communications between the
stations.
– a circuit, furnished by the company,
terminating in telephone instruments,
keys or jacks which do not provide
exchange service.
Private Line or Leased Line
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GENERAL ENGINEERING & APPLIED SCIENCES
Raceways
– a general term which refers to pipe,
conduit, underfloor duct, heeder duct,
cellular floor, overfloor moulding, surface
wiring systems, wiring channels in
removable partitions, floor boxes and
floor fittings and any other channel for
holding wires and cables which is
designed expressly for and used solely
for this purpose.
Riser Closet
– a location where riser cables terminate
for further distribution through out the
floor. It may also serve as an apparatus
closet or satellite closet, dependent upon
the size of the building and the telephone
facilities involved.
Riser Conduit
– refers to non-combustible tubing which
encases the riser cable between
enclosed type metallic telephone terminal
cabinets.
Riser Shaft
– refers to a series of closets connected
by a slots or short conduit sleeves
between floors or an open shaft vertically
in a building.
Service Fitting
– a box mounted on the finished floor
that houses the connecting device for
communications.
Sleeve or Conduit Sleeve
– a circular opening through the floor
structure to allow the passage of cables
and wires.
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GENERAL ENGINEERING AND APPLIED SCIENCES
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Station
– refers to the telephone instrument,
consisting of a transmitter, receiver and
associated apparatus which permit
telephone conversations with other
stations.
Station Wiring
– refers to the final end link in connection
to communication equipment to company
cable facilities.
Terminals and Terminations
– points at which cable pairs are
connected to station wires or other cable
pairs by means other than cable splicing.
Under Floor Raceway
– any facility provided for the express
purpose of holding wires or cables and
located within or immediately below the
floor structure. Raceways may be of
metallic insulating material.
Usable Floor Area
– the portion of the floor area that is
rentable or usable. It includes such as
elevators,
stairways,
permanent
hallways, janitor’s room, toilet and other
fixed
construction
making
space
unavoidable for rental use. Usable floor
area is generally 20% less than the total
building floor areas.
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GENERAL ENGINEERING & APPLIED SCIENCES
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1.
Define as wires or cables entering the building, terminated to the main
cross connecting point within the building from the nearest telephone
facility.
A. drop wire
B. local loop
C. service entrance
D. subscribers loop
2.
A type of service entrance that serves as means of providing service
aerially from a pole to a building.
A. Aerial entrance
B. Underground entrance
C. Overhead entrance
D. Handhole
3.
The size of the aerial entrance conduit shall not be less than ____ in
dimeter.
A. 20mm
B. 30mm
C. 40mm
D. 50mm
4.
The maximum span from telephone pole to a building used in aerial
entrance should be _____.
A. 20m
B. 30m
C. 40m
D. 50m
5.
In aerial entrance, the minimum clearances between telephone cable
and power entrance must be ___ radial distance.
A. 2m
B. 3m
C. 4m
D. 1m
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GENERAL ENGINEERING AND APPLIED SCIENCES
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6.
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In aerial entrance, the minimum clearance from ground level when
crossing the street must be ____.
A. 4.4m
B. 3.3m
C. 5.5m
D. 6.6m
7.
In aerial entrance, minimum clearance over areas accessible to
pedestrians only, must be____.
A. 3.5m
B. 5.5m
C. 4.5m
D. 6.1m
8.
A type of service entrance that provides mechanical protection and
minimize the need for possible subsequent repairs to the property.
A. Aerial entrance
B. Underground entrance
C. Overhead entrance
D. Handhole
9.
An underground entrance’s minimum depth under areas used for
vehicular traffic inside private property is
A. 800 mm
B. 600 mm
C. 900 mm
D. 700 mm
10. For underground entrance, conduits should be separated from power
conduits by not less than ____ in well-tamped earth:
A. 300 mm
B. 100 mm
C. 50 mm
D. 150 mm
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GENERAL ENGINEERING & APPLIED SCIENCES
11. For underground entrance, conduits should be separated from power
conduits by not less than ____ of concrete
A. 300 mm
B. 100 mm
C. 50 mm
D. 150 mm
12. The size of underground entrance conduit within the building shall be no
case smaller than ____in diameter when the service entrance does not
require use of a service box.
A. 50 mm
B. 75 mm
C. 65 mm
D. 45 mm
13. The use of handholes will be permitted for entrance cable not exceeding
____ pairs.
A. 20
B. 40
C. 30
D. 50
14. The minimum size for vehicular handholes is
A. 0.61m x 0.91m x 0.91m
B. 0.61m x 0.91m x 0.73m
C. 0.19m x 1.23m x 1.21m
D. 0.91m x 1.22m x 1.19m
15. The minimum size for non-vehicular handholes is
A. 0.61m x 0.91m x 0.91m
B. 0.61m x 0.91m x 0.73m
C. 0.19m x 1.23m x 1.21m
D. 0.91m x 1.22m x 1.19m
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GENERAL ENGINEERING AND APPLIED SCIENCES
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16. The use of service box will be permitted for entrance cable exceeding
____ pairs. The minimum size for service-box is
A. 0.61m x 0.91m x 0.91m
B. 0.61m x 0.91m x 0.73m
C. 0.19m x 1.23m x 1.21m
D. 0.91m x 1.22m x 1.19m
17. The minimum size for service-box is
A. 0.61m x 0.91m x 0.91m
B. 0.61m x 0.91m x 0.73m
C. 0.19m x 1.23m x 1.21m
D. 0.91m x 1.22m x 1.19m
18. The minimum size for an entrance conduit is
A. 20mm
B. 30mm
C. 40mm
D. 50mm
19. The minimum number of entrance conduit is
A. 1
B. 2
C. 3
D. 4
20. It is a point where cable from TELCO and the in-building distribution
system are terminated.
A. drop wire
B. terminal wire
C. main terminals
D. service box
21. The location of the main terminal must be equipped with adequate
lighting, and located at a minimum distance of ______above floor finish.
A. 1.3 m
B. 2.3 m
C. 1.6 m
D. 2.6 m
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GENERAL ENGINEERING & APPLIED SCIENCES
22. The location of the main terminal should have enough working space in
front of all terminations. Normally _____away from all hazards.
A. 900 mm
B. 800 mm
C. 1000 mm
D. 700 mm
23. A main terminal required for terminating entrance cables using one or
more terminal blocks.
A. Main Telephone Terminal Cabinet (MTTC)
B. Main Distributing Frame (MDF)
C. Riser System
D. Service Box
24. The backboard color for Main Telephone Terminal Cabinet (MTTC) used
other special services is:
A. white
B. yellow
C. black
D. blue
25. The backboard color for Main Telephone Terminal Cabinet (MTTC) used
as an entrance is:
A. white
B. yellow
C. black
D. blue
26. The backboard color for Main Telephone Terminal Cabinet (MTTC) used
for risers is:
A. white
B. yellow
C. black
D. blue
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GENERAL ENGINEERING AND APPLIED SCIENCES
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27. A main terminal generally recommended when entrance cable
requirements will exceed 300 pairs.
A. Main Telephone Terminal Cabinet (MTTC)
B. Main Distributing Frame (MDF)
C. Riser System
D. Service Box
28. Defined as the vertical and horizontal distribution of telephone
communication lines between two or more floors or adjoining premises
on the same floor of a building generally originating at or near the cabinet
up to the Telephone Terminal or outlet.
A. Main Telephone Terminal Cabinet (MTTC)
B. Main Distributing Frame (MDF)
C. Riser System
D. Service Box
29. A riser system usually extends from the ground to the roof top of the
building with no floor separation similar to a ventilating shaft. Telephone
cable is not permitted in unless placed in metallic conduit.
A. Open Riser
B. Elevated Riser
C. Closed Riser
D. Underground Riser
30. A riser system that consists of a series of telephone terminal
cabinets/closets vertically or non-vertically aligned, usually beginning at
the ground floor and extending throughout the height of the building.
A. Open Riser
B. Elevated Riser
C. Closed Riser
D. Underground Riser
31. Type of distribution system that provides concealment of the wires with
the least flexibility.
A. Conduit system
B. Under floor duct system
C. Ceiling system
D. Cellular floor system
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32. Type of distribution system scomprise of two components, distribution
ducts and feeder (header) ducts. Depending on floor structure, they may
be designed into a one or two-level system.
A. Conduit system
B. Under floor duct system
C. Ceiling system
D. Cellular floor system
33. Type of distribution system that serves the same floor where the cables
(wires) are placed within the ceiling and brought down to desk locations.
A. Conduit system
B. Under floor duct system
C. Ceiling system
D. Cellular floor system
34. Type of distribution system comprises of two distinct components,
distribution cells and feeder (header) ducts. Depending on the floor
structure, the distribution cells may be constructed of steel or concrete.
A. Conduit system
B. Under floor duct system
C. Ceiling system
D. Cellular floor system
35. It is a floor assembly elevated with respect to an existing area providing
unlimited accessible space under the floor. This has been used for
computer rooms and office space.
A. Unlimited access (raised floor)
B. Closet
C. Cabinet
D. Conduit system
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GENERAL ENGINEERING AND APPLIED SCIENCES
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36. It is typically a box-type made of steel or fibre glass usually prefabricated
in standard sizes with cover and knockout holes, for in-building
telephone distribution.
A. Unlimited access (raised floor)
B. Closet
C. Cabinet
D. Conduit system
37. It is a room or shallow enclosure which is normally enclosed by a door
(or series of doors in the case of a shallow closet).
A. Unlimited access (raised floor)
B. Closet
C. Cabinet
D. Conduit system
38. A closet which varies from 460 to 760 mm in depth.
A. Shallow closet
B. walk in closet
C. Deep closet
D. raised closet
39. A closet which which is 1200 mm or more in depth.
A. Shallow closet
B. walk in closet
C. Deep closet
D. raised closet
40. A suitable enclosure large enough to house key telephone systems
apparatus, power equipment and terminating facilities for key telephone
systems stations and sevices, as well as central closets, zone closets, or
riser closets, according to the design of the underfloor raceway or riser
system.
A. Cabinet
B. Apparatus Cabinet
C. Apparatus Closet
D. Closet
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GENERAL ENGINEERING & APPLIED SCIENCES
41. Refers to the physical cable within a building that does not include
station wiring cable.
A. building cable
B. inside wire
C. inside drop
D. service drop
42. An assembly of cellular metal or concrete floor raceways units forming
part of a continuous floor structure.
A. Conduit system
B. Under floor duct system
C. Ceiling system
D. Cellular floor raceways
43. A load-bearing floor unit containing one or more longitudinal cells which
may be closed on all sides or open at top or bottom.
A. box
B. closet
C. cabinet
D. cellular floor unit
44. The place where customer’s communication lines are terminated and
where the equipment which interconnects those lines is located.
A. trunk office
B. central office
C. toll station
D. tandem office
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