Chp 3 Flashcards
Telecommunications Room (TR)
Architectural space
Equipment Room (ER)
Environmentally controlled
Entrance Facility (EF)
OSP
Loud equipment should be located ___ the telecommunications space
Outside
Sleeves/slots should be located
adjacent to a wall which can support the cables and not above the termination point (to be sure equipment is accessible)
Three types of steel conduit
Rigid metal conduit (RMC)
Intermediate metal conduit (IMC)
Electrical metallic tubing (EMT)
EMT
Thin wall
EMT is the ___ weight steel conduit
Lightest
At least ___ 4” conduits should serve an ER, TR, EF
4
TRs on the same floor should be connected with at least ___ 3 inch conduit
1
Recommended door dimensions
3’ X 6.5’ - minimum
Double door recommended (slide side to side or removable)
Used to reduce static electricity
Antistatic floor tile
ER power provisions
Two dedicated duplex receptacles on individual circuits
HVAC should run
24 hours a day/365 days a year
Temperature of room that does not contain active equipment
95°
Rooms with active equipment should be kept at ___
77° and 55% humidity
Interchange per hour for TR
1
Air change per hour for tunnel
3
Air change per hour for battery plant
4
___ should be kept close to the entrance of the telecommunications space
Fire extinguishers
Telecommunication spaces should be located away from ___
Threats of flooding
Minimum lighting in TE
50 foot-candles
Shallow room
an enclosed space for housing cabling terminations, cross connect cabling, and telecom equipment
Building less than 1000 sq’
Cabinet
Wall field sizing
4 sq” / balanced twisted-pair 4-pair circuit
2 sq” / optical fiber strand
Wire management spacing
5-6” above and below connecting hardware
Corners result in ___ of lost space
12”
Standard for racks, cabinets or enclosures
(EIA/ECA) 310-E
TR’s and TE’s differ from ERs and EFs how?
TRs TEs serve a floor, ERs and EFs server buildings, tenants, or SP
TRs or ERs should be located on every ___
Floor
One TR or ER for every ___ square feet
10,000
A full-size TR can support ___ 4-pair cables
480
A small TR can support ___ 4-pair cables
240
How many square feet does this room serve (2 racks)?
Less than 5000 sq’
TE doors may be?
Hinged or removable
TE service area
3,600 sq’
ERs should be located in the ___
Center
255 work areas
55 BAS devices
ER size ___
205 sq’
1
Divide the amount of usable floor space by ≈9.3 m2 (100 ft2) to determine
the number of individual work areas that the ER will serve through both
backbone and horizontal cabling.
NOTES: Usable floor space includes the building area used by occupants in
their normal daily work functions. For planning purposes, this
should include hallways but not other common areas of the
building. If the usable floor space is unknown, deduct 20 percent of
the total floor area to estimate the usable floor space.
An area of ≈9.3 m2 (100 ft2) is an industry average used to
calculate work areas. If work areas are smaller, the size of the ER
shall be increased accordingly.
2
3
Divide the amount of total floor space by ≈23.2 m2 (250 ft2) to determine
the number of BAS devices that the ER will serve through both backbone
and horizontal cabling.
Multiply the number of work areas to be served by ≈0.07 m2 (0.75 ft2) and
the number of BAS devices to be served by ≈0.023 m2 (0.25 ft2) to
determine the ER size.
If there are fewer than 200 work areas, the ER shall be no less than ≈14 m2 (150 ft2). For
special-use buildings (e.g., hospitals, hotels), ER size requirements may vary
Typical equipment cabinets require ___ of floor area and ___ working clearance
10 sq’ & 10 sq’
Recommended cable pathways entering TR
(4) 4” + spare if over 40,000sq’
Cable pathways entering ER
4, 4” conduits minimum with at least 1 spare
Cable pathways entering EF
(5) 4” + (3) 2”
ER temperature
77°
ER humidity
55%
ER heat dissipation
5000 BTUs (British Thermal Unit)
HVAC sensors/controls located @ ___ AFF
5’
MC / HC
Main Crossconnect / Horizontal Crossconnect
The MC should be located ___
Close to the ER / center of building
Size of telecom spaces
5000 sq’ - 8’ x 10’
5000-8000 sq’ - 9’ x 10’
8000-10,000 sq’ - 10’ x 11’
TE power requirements
1 outlet
Standard working height means ___
No scaffold or ladder req’d
Avoid placing the TR near ___
Kitchens
Bathrooms
Janitor closets
Color code for 4”, 5” & 6” conduit thread protectors
Blue
___ protect telecommunications systems from contaminants
Positive room pressure
Vapor barriers
Absolute filters
Recommended space height for rack, cabinet or enclosure
7.5’
ER minimum size
10’ x 16’
Allow ___ more space for routing of cables, jumpers and patch cords
20%
Color code for 1”, 2” & 3” conduit thread protectors
Orange
If usable space is unknown, deduct ___ % of the total floor area to estimate usable floorspace when determining size of ER
20
Telecommunications Enclosure (TE)
Case
TR Plywood required specs
4’x8’x 0.75” AC rated or better. Mounted at 8” AFF on at least 2 walls.
Required clearance space for wall mounted equipment
12in
Required space by code in front, and behind, rack
1m in front and 1m behind largest equipment (4 post rack, or deepest mounted equipment)
Space allocated for rack mounted equipment
18in
