Chapter 3 - Telecommunications Spaces

Question 1

Light fixtures within telecommunications spaces should be located a minimum of ___ above finished floor (AFF).

A) 2.3m (7.5ft)
B) 2.4m (8ft)
C) 2.6m (8.5ft)
D) 3m (10ft)

Answer 1

C) 2.6m (8.5ft)

Question 2

What is the minimum light level in telecommunications spaces?

Answer 2

~ 500lux (46 foot candles) in the horizontal plane and ~200lux (18.6 foot candles) at 1m (3.28ft) above finished floor

Question 3

For a telecommunications space, if the serving area is 5000 sq ft or less, the room dimensions shall be at least?

Answer 3

10ft x 8ft

Question 4

For a telecommunications space, if the serving area is greater than 5000 sq ft and less than or equal to 8000 sq ft, the room dimensions shall be at least?

Answer 4

10ft x 9ft

Question 5

For a telecommunications space, if the serving area is greater than 8000 sq ft and less than or equal to 10,000 sq ft, the room dimensions shall be at least?

Answer 5

10ft x 11ft

Question 6

If the building is smaller than ____, it may be served b shallow rooms.

Answer 6

5000 sq ft

Question 7

If the building is smaller than _____, it may be served by wall cabinets, self-contained cabinets, or enclosed cabinets.

Answer 7

1000 sq ft

Question 8

If the minimum size requirements for a telecommunications space can not be met, then a minimum ___ depth, by ___width, by ___ height (inside dimensions) should be provided with a sliding or double 36 inch doors for every 240, 4-pair cable terminations served.

Answer 8

4ft D x 6ft W x 8.5ft H

Question 9

An equipment room (ER) typically houses what?

Answer 9

Usually houses a Main Cross Connect (MC) [Campus Distributer] or an Intermediate Cross Connect (IC) [Building Distributer]

Question 10

How much space should be allocated for each 4-pair balanced twisted pair circuit to be patched or cross connected?

Answer 10

4 sq in
Note when cabling requires surge protection, the recommended space allocation is two to four times larger than this for cross-connections

Question 11

How much space should be allocated for each optical fiber core/strand to be patched or cross connect?

Answer 11

2 sq in
Note: this space allocation is also appropriate for coaxial cable
Note when cabling requires surge protection, the recommended space allocation is two to four times larger than this for cross-connections

Question 12

True or False
An Equipment Room (ER) may provide any or all of the functions of a Telecommunications Room (TR) or an Entrance Facility (EF).

Answer 12

True

Question 13

Define a telecommunications room (TR).

Answer 13

A TR are generally considered floor-serving or tenant serving spaces that provide a connection point between backbone and horizontal infrastructures. The cabling found in a TR could be Horizontal Cross-connect (Floor Distributors), Intermediate Cross-connect (Building Distributor), and/or Main Cross-connect (Campus Distributor)

Question 14

Define a telecommunications Enclosure (TE)

Answer 14

A TE is a case or housing for telecommunications equipment, cable terminations, and cross-connect cabling. Typically limited to Horizontal Cross-connect (Floor Distributors)

Question 15

There should be at least one TR or ER per floor. If the usable floor space to be served exceeds ____, consider additional TRs.

Answer 15

10,000 sq ft.
Also will need more TRs if the cable length between the Horizontal Cross-connect and the telecommunications outlet location, including slack, exceeds 295ft.
For TRs that serve areas of office densit of less than one work area per 100 sq ft, a TR may serve larger areas than the 10,000 sq ft, provided the horizontal cable length requirements are met.

Question 16

What is the minimum ceiling height for telecommunications spaces?

Answer 16

8ft AFF

Consideration should be given to having a 10ft AFF (recommended)

Question 17

Wall mounted equipment should have a minimum of ___ depth of the wall.

Answer 17

6in

Question 18

A minimum side clearance of ___ is recommended at corners.

Answer 18

12 in

A clearance of ~1m (3.28ft) is recommended for telecommunications equipment

Question 19

Multiple telecommunications spaces on the same floor shall be interconnected with a minimum of ___ conduits or a pathway that provides equivalent capacity.

Answer 19

Two 4” Conduits

Question 20

The size and number of conduits or sleeves used for backbone pathways depend on the usable floor space served by the backbone distribution system. However at least ____ sleeves are recommended to serve a TR, ER, or EF.

Answer 20

Four 4” sleeves

Question 21

What is the equation to calculate the total heat load to be coordinated with the mechanical engineer?

Answer 21

Power (W) x 3.412 = BTU [calorie]/hr

Question 22

The ICT designer should plan for:

- A minimum clear space of ____ above and below the top and bottom of the connecting hardware for cable management

Answer 22

5 in

Question 23

To allow access to wall and rack, cabinet or enclosure spaces for terminations, do not mount termination hardware closer than ____ to any corner

Answer 23

6 in

Question 24

Cross-connect fields, patch panels, and active equipment in telecommunications spaces shall be placed to allow cross-connections and interconnections via jumpers, patch cords, and equipment cords whose lengths per channel do not exceed: ___ for patch cords, equipment cords or jumpers in the HC (FD).

Answer 24

5m (16.5ft)

Question 25

Cross-connect fields, patch panels, and active equipment in telecommunications spaces shall be placed to allow cross-connections and interconnections via jumpers, patch cords, and equipment cords whose lengths per channel do not exceed: ___ total for patch cords/jumpers, equipment cords connected to the HC (FD), plus the work area equipment cord.

Answer 25

~10m (33ft)

Question 26

Cross-connect fields, patch panels, and active equipment in telecommunications spaces shall be placed to allow cross-connections and interconnections via jumpers, patch cords, and equipment cords whose lengths per channel do not exceed: ___ for patch cords or jumpers that serve MC (CD) or IC (BD).

Answer 26

~20m (66ft)

Question 27

Racks, cabinets, or enclosures are recommended to have a height of ____ and have a rial size and top flange width of ___.

Answer 27

Height of ~2.1m (7ft) and width of ~483mm (19in)

Note: Some mounting systems require rack widths greater than 19in

Question 28

Plywood in telecommunications spaces should be ___ high, with a minimum thickness of ___. It should also be mounted ___ AFF.

Answer 28

8ft high, minimum thickness of 0.75in, and mounted 8in AFF.

Question 29

Receptacles should be mounted ___ AFF and placed at intervals of ____ around perimeter walls.

Answer 29

6in AFF, and 6ft intervals

Question 30

When designing the layout of a TR, if a substantial portion of the TR is dedicated to backbone cable distribution, then you should:

Answer 30

Include space for splicing and ladder racking

Question 31

When designing the layout of a TR, if special telecommunications services are provided, then you should:

Answer 31

allow additional space for cross-connect equipment

Question 32

When designing the layout of a TR, if more than one tenant is served from the same TR, then:

Answer 32

Provide clear separation and identification of each tenant’s equipment and terminations

Question 33

When designing the layout of a TR, if an EF is housed at the same location, then:

Answer 33

Include space for cabling protection, grounding (earthing) enclosures, and splice cases

Question 34

A telecommunications enclosure (TE) should have a minimum light level of ____.

Answer 34

50 foot candles

Question 35

A Telecommunications Enclosure should serve an area not greater than ____.

Answer 35

3600 sq ft

Question 36

When calculating space for cable termination for TRs, add ____ for cable runs, jumpers, cords.

Answer 36

20%

Question 37

What is the minimum space that should be allocated for an equipment room (ER)?

Answer 37

10ft x 16ft

Question 38

How would you determine the minimum size of an ER?

Answer 38

1. Divide usable floor space by 100 sq ft to determine number of work areas. If unknown, deduct 20 percent of total floor area to estimate usable floor space.
2. Divide total floor space by 250 sq ft to determine number of BAS devices that the ER will serve.
3. Multiply number of work areas by 0.75sq ft and the number of BAS devices by 0.25sq ft to determine ER size

Note: If fewer than 200 work areas, ER shall be no less than 150 sq ft.

Question 39

How much access headroom is required for cable trays? What is the minimum and recommended?

Answer 39

Minimum 8in

Recommended 12in

Question 40

HVAC sensors and controls shall ideally be placed ____ AFF in the ER.

Answer 40

5ft

Question 41

HVAC systems in the ER should be routinely maintained at a minimum every ____, to check belts and filters and provide lubrication to moving parts.

Answer 41

6 months

Question 42

Typical equipment cabinets require ___ of floor area and ____ of working clearance.

Answer 42

10 sq ft of floor area and 10 sq ft of working clearance

Question 43

Floor loading of equipment cabinets varies from ____ to _____.

Answer 43

2.4 to 12 kPa ( 50 to 250 lbf/sq ft)

Question 44

The floor rating shall be greater than ____ under distributed loading areas.

Answer 44

100lb/sq ft

Question 45

The floor rating shall be greater than ____ under concentrated loading.

Answer 45

2000lbf

Question 46

ASHRAE handbook calls for the environmental settings for an ER To be at a temperature range of ____ and relative humidity of ____.

Answer 46

Temp range (64-81 degrees F)
Relative humidity = 60%

Question 47

1 ton of air conditioning is equal to _____ Btu or (____W)

Answer 47

12,000 Btu or 3516 W

one watt is equal to 3.413 BTU/hr

Question 48

Buildings larger than ____ must have a dedicated room for EFs.

Answer 48

100,000 sq ft

Question 49

Outside Plant (OSP) cable should be terminated or transitioned to listed cable as close as practical upon entry to the building. Maximum transition of ___ from point of entrance.

Answer 49

15m (50ft)