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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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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 entran ce conduit = 50 mm diameter Minimum number of e ntrance 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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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 D istributing 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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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 clo set, which is 1200 m m or more in depth.
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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
Company Standards
– 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
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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 Cl o set
– 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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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
– 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.
System
Private Line or Le ased Line
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Raceways
GENERAL ENGINEERING & APPLIED SCIENCES
– 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 tu bing 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 Slee ve
– a circular opening through the floor structure to allow the passage of cables and wires.
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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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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 358 Loading Next Page
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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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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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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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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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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 363 Loading Next Page
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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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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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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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