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BICSI RCDD TDMMv14 > Chapter 5 - Horizontal Distribution Systems > Flashcards

Chapter 5 - Horizontal Distribution Systems Flashcards

1
Q

How should the usable floor area be divided in the ceiling zones method of ceiling distribution?

A

Usable floor area should be divided into zones of ~250 sq ft to 1000 sq ft each

How a zone is divided depends on the zone’s purpose. For Consolidation Points (CP)s, zones should be preferably divided by building columns. BAS zones depend on number of BAS, coverage areas per cable, and other device-related factors.

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2
Q

When using the ceiling zone method of pathway distribution for horizontal cabling, the raceways, conduits or cable trays should extend from the telecommunications spaces to the ____ of the zone.

a) any location along the perimeter
b) the midpoint

A

The midpoint.

And from there the pathway should extend to the top of the utility columns or wall conduit

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3
Q

What is PoH?

A

Power over HDBaseT. An alternate to PoE for the transmission of dc power and data simultaneously over balanced-twisted pair and other forms of communications cabling.

PoH was created by the HDBaseT Alliance which delivers a maximum of 95W over four pairs.

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4
Q

True or False
MUTOAs shall be located in fully accessible, permanent locations. Install MUTOAs in ceiling spaces, under access flooring and any obstructed areas.

A

False.
Do not install MUTOAs in ceiling spaces, under access flooring or any obstructed areas. MUTOAs shall not be installed in furniture unless that furniture is permanently secured to the building structure.

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5
Q

For balanced twisted-pair cabling, MUTOAs should be located at least ~___ from the Horizontal Cross-Connect (HC) (Floor Distributer FD).

A

15m (49ft)

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6
Q

The work area side of the MUTOA should be marked with the:

A) Maximum number of available ports
B) Served work area identifiers
C) Attached equipment cord identifiers
D) Maximum allowable work area equipment cord length

A

D) Maximum allowable work area equipment cord length

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7
Q

The working load capacity of a cable tray system is determined by?

A
  • Static load capacity of the tray

- Length of the support spans

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8
Q

When telecommunications cabling pathway runs parallel to power cabling pathways, it is recommended to provide a minimum of ____ separation.

A

2in

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9
Q

What is the maximum length for the work area cord using 24AWG MUTOA?

A

72ft

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10
Q

What is the maximum length for the work area cord using 26AWG MUTOA?

A

56ft

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11
Q

When designing a MUTOA environment, the maximum combined length of 26 AWG work area, patch, and equipment cords cannot exceed:

A

70ft

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12
Q

When designing a MUTOA environment, the maximum combined length of 24 AWG work area, patch, and equipment cords cannot exceed:

A

89ft

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13
Q

To ensure accessibility, ceiling-based pathways for horizontal cabling must be installed with a minimum of ___ clear vertical space above the ceiling tiles.

A

3in

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14
Q

Supports for ceiling-based pathways for horizontal cabling must be installed at intervals not exceeding ___ to minimize cable sag, and a minimum of ___ above the ceiling tiles.

A

not exceed 5ft, and minimum of 3in above ceiling tile

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15
Q

If sufficient space is available, how much space should be provided above the horizontal cable pathways in the ceiling?

A

Up to 6in should be provided between the cable pathway and the suspended ceiling.

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16
Q

Within the permanent link, the maximum cable length shall be no more than ____, regardless of the type of transmission media used.

A

295ft

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17
Q

Within the channel, the total length of cabling shall not exceed ____. In addition the total combined length of flexible cabling within the channel shall not exceed ___ except when longer work equipment cords are permitted in conjunction with a MUTOA.

A

328ft

33ft for flexible cabling

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18
Q

When utilizing balanced twisted-pair cabling, in addition to the requirements above, an individual balanced twisted-pair cord used within the channel but not within the permanent link shall be no longer than: ____ for 24AWG cords, and ____ for 26AWG cords.

A

16.5ft for 24 AWG cords

13ft for 26 AWG cords

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19
Q

The work area telecommunications outlet boxes should be located near an electrical outlet within ____ and installed at the same height.

A

1m (3.3ft)

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20
Q

For open office furniture openings for mounting faceplates should have a minimum clearance of ___.

A

1.2in

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21
Q

A single MUTOA can serve a maximum of ____ work areas.

A

12 work areas

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22
Q

MUTOAs should be located at least ___ from the HC (FD) to minimize the effects of multiple connections in close proximity on near-end crosstalk loss and return loss.

A

49ft

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23
Q

MUTOAs allow work area equipment cords to extend beyond ____, depending on the length of the horizontal cable.

A

16.5ft

24
Q

For balanced twisted-pair cabling, the CP should be located at least ____ from the HC (FD)

A

49ft

25
Q

What are the advantages of a Consolidation Point (CP)?

A
  • may be useful when open office furniture reconfiguration is frequent. CPs provide additional cabling system design flexibility for ICT distribution designers.
  • Can potentially decrease work area cabling installation time and the additional expense of materials when rearranging open office furniture and associated cabling
26
Q

What are the disadvantages of the Consolidation Point (CP)?

A
  • Generally increase the original installation time and expense of additional materials
  • Add additional labeling requirements
  • May contribute to the complexity of testing and troubleshooting of the installed horizontal cabling
  • May degrade the transmission characteristics
27
Q

A conduit from the TR should not extend to more than ___ and shall not extend to more than ___ telecommunications outlet boxes.

A

Should not extend to more than two

Shall not extend to more than three

27
Q

A conduit from the TR should not extend to more than ___ and shall not extend to more than ___ telecommunications outlet boxes.

A

Should not extend to more than two

Shall not extend to more than three

28
Q

The nominal diameter for the cross-sectional area of a cable or conduit is:

A

cross sectional area = 0.785 x d2

29
Q

The minimum bend radii for conduit that is greater than 2in or when used for optical fiber shall be __ times the internal diameter of the conduit.

A

10 times

30
Q

The minimum bend radii for conduit that is less than 2in shall be __ times the internal diameter of the conduit.

A

6 times

31
Q

A third bend may be acceptable in a pull section without derating the conduit’s capacity if what is true?

A

Only needs one of the statements below to be true.

  • The total run is not longer than 33ft
  • the conduit size is increased
  • one of the bends is located within 12 in of the cable feed end
32
Q

Standard floor height access floors are ____ or higher.

A

6 in

33
Q

Low-profile access floors are less than ____ in height. They are often used where structural limitations are encountered.

A

6in

34
Q

Access floors with modular floor panels have panel sizes from ___ to ___ square.

A

18in to 24in

35
Q

Use of freestanding systems should be restricted to installations with finished heights of ___ or less.

A

12 in

36
Q

For low-profile floors, cable or cable pathways shall be provided a clearance of at least ____.

A

0.75in

37
Q

For standard-height access floors, the minimum finished height of access flooring should be at least ___ minimum clearance above the structural floor, with a recommended clearance of ____. Where multiple systems will be installed under the raised floor, considerations should be given to minimum ___ clearance above the structural floor.

A

6in minimum clearance
8in minimum recommended
12in suggested when multiple systems are installed

38
Q

An environment where plenum is used for HVAC, the finished floor height shall be ___ or greater for access flooring.

A

12in

39
Q

Regardless of the height of the finished floor, a minimum of ____ of free space should exist between the top of the cable tray side rails to the bottom of the access floor.

A

2 in

40
Q

For horizontal distribution in ceiling spaces, allow for a minimum of ___ of clear vertical space above conduits and cables.

A

3in

41
Q

For horizontal pathways in ceiling spaces, allow for a minimum of ___ of clear vertical space above the tray or raceway for overhead ceiling cable tray or raceway systems.

A

12 in

42
Q

In the ceiling zones method of ceiling distribution, the usable floor area should be divided into zones of ___ to ___ each.

A

250 sq ft to 1000 sq ft

43
Q

Ceiling conduits, raceways, cable trays and cabling shall be suspended from or attached to the structural ceiling or walls, the pathway shall be installed with at least ___ of clear vertical space above the ceiling tiles and support channels (T-bars) to ensure accessibility.

A

3in

44
Q

Non-continuous supports for cable pathways are installed at intervals not exceeding ___ to minimize cable sag while keeping cables a minimum of ___ above ceiling grid.

A

5ft intervals

3in above ceiling grid

45
Q

For cables running through j-hooks they will have a maximum of ___ between cables on the vertical plane.

A

max 1 ft.

46
Q

Cable tray supports shall be placed within ___ on each side of any connection to a fitting.

A

2ft

47
Q

For conduits serving one or two telecommunications boxes an inner diameter of ___ or greater is recommended. For three boxes ____ or greater is recommended.

A

1in for one to two boxes

1.25in for three boxes

48
Q

The practical capacity for telecommunications cabling in perimeter raceways is between ___ and ___ fill, depending on cable bending radius.

A

20percent and 40 percent fill

49
Q

Furniture and horizontal initial pathway capacity should not exceed __ of the pathway cross section. A maximum of ___ pathway fill is allowed to accommodate unplanned additions after initial installation.

A

40 percent of pathway cross section

max of 60 percent fill

50
Q

For open office modular furniture, when telecommunications cabling pathway runs parallel to electrical pathways, the recommendation is a minimum of ___ separation.

A

2in

51
Q

Maximum height allowed for side reach telephones is ____

A

48in

52
Q

Minimum height for ADA for all electrical and communication systems receptacles on walls shall be___

A

15in AFF

53
Q

Maximum height for ADA for side reach telephones if obstructed by something 24inW x 34inH is ____

A

46in

54
Q

For ADA if forward reach occurs over an obstruction (20in to 25in) the maximum height shall be ____

A

44in

55
Q

In newly constructed or altered facilities, ___ of the public telephones shall be equipped with volume controls.

A

25 percent

56
Q

A maximum of ___ splice(s) is/are permitted in an individual optical fiber horizontal cabling channel.

A

two

BICSI RCDD TDMMv14 (22 decks)

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