* Chapter 3: Telecommunication Spaces Flashcards
Telecommunication Spaces are..
The rooms and areas where telecommunication cabling systems are terminated, cross connected and interconnected to installed telecom equipment.
Minimum TR ceiling height
Minimum 8’ AFF (2.4meters). Ideally 10’
Are drop ceilings recommended for TRs?
No, only if an underfloor distribution method is used
How much space should be allocated for the installation and maintenance of all cabling and equipment mounted on walls, racks, cabinets or enclosures?
3.28 Feet or 1 Meter
Provide at least ____ depth off the wall for wall mounted equipment
6 inches
Provide space for an isle of at least _____ wide in the front and in the rear of the space for each equipment rack, cabinet and enclosure.
3.28 Feet or 1 Meter
When installing racks, in corners a minimum of _____ side clearance is recommended.
12 inches
True or False: Clearance is measured from the outermost surface of any devices, hardware, cables, etc that installed in racks, cabinets, enclosures or backboards.
True
Trays and conduits located within the ceiling of a TR should protrude into the room a distance of ____ to ____ with a bend and above ____ high.
Trays and conduits located within the ceiling of a TR should protrude into the room a distance of (1 inch) to (2 inch) with a bend and above (8ft) high.
How many sleeves are recommended to serve a TR, ER or EF
At least four (4 Trade Size)
TR Door Guidelines / Recomendations
At least three ft wide and 6.5 ft high if lockable.
Double doors are recommended for ER’s 6 ft wide by 7.5 ft high
T/F - TR Doors should have the same fire rating as the walls in the room
True
Dust and static electricity should be avoided by:
Installing antistatic floor tile or grounded floor tiles and mats bonded to ground using manufacturer recommended hardware
Placing printers outside of TRs
Treating floors, walls and ceiling to minimize dust. (should be recommended by the GC or Building Contractor)
A TR should contain minimum of _____ dedicated, nonswitched ac receptacles for equipment power, each on individual branch circuits.
Two dedicated ac receptacles
Non switched receptacles
Not controlled by a wall switch or other occupancy sensor that may lead to inadvertent loss of service
TR HVAC should
maintain a continuous and dedicated environmental control. If emergency power is available, the ITS designer should consider connecting it to the HVAC system that serves the space
T/F Telecom Spaces should be located above any threat of flooding
True
T/F Liquid carrying pipers shall not be routed through, above or in the walls encompassing the telecom space
True
Floor load rating for a TR
50 pound force per sqft. lbf/ft2
Where should light switches be located in TR’s
Near the entrance. Dimmers and vacancy sensors are not recommended
TR Lighting
Should not come off same circuit as telecom equipment
One light set on normal power and one on emergency power
Use a light colored finish on walls, floors and cabinets to enhance room lighting
Provide a minimum of ___lux (_____ foot-candles) at the point of cable termination
538 lux.. 50 foot-candles
Light fixtures in TR should be a minimum of ____m or ____ft AFF when possible
2.6m 8.5 ft
Telecom Spaces in a multi floor building should be aligned ________
vertically (stacked)
Likely sources of EMI include
electrical power transformers
copiers
door openers
elevator systems
factory equipment
Telecom space sizing guidelines for horizontal cabling distribution are based on distributing telecom services (drops) to one individual work area per ______sqft
100 sqft of usable floor space
What should be the minimum size of the TR if the space is 5,000sqft or less?
10ft X 8ft
What should be the minimum size of the TR if the space is between 5,000 and 8,000 sqft?
10’X9’
What should be the minimum size of the TR if the space is between 8,000 and 10,000 sqft ?
10’X11’
TF: The installation of active equipment is not recommended in shallow rooms because many types of active equipment require environmental controls and a depth of at least 1m or 3.28ft
True
Shallow rooms serving areas of 1000 sqft or less should be at least…
2’X8.5’
Walk in rooms serving areas less than 5,000 sqft should be at least..
4.5’x4.5’
For retrofits, if the minimum room sizes cannot be met, ____D x____W x____H should be provided with double doors or sliding doors for every _____, 4 pair cable terminations served
4’ x 6’ x 8.5’
240
Space allocation for..
Balanced Twisted Pair
Fiber
4 sq inches per cable to be patched or cross connected
2 sq inches per fiber strand/core to be patched or cross connected
Examples of corrosive, combustible or explosive materials which should never be stored in TR
Cleaning chemicals Office and computer supplies (paper, cardboard, copier/print fluids.) Grounds keeping chemicals Gas and other fuels Hazardous Materials (asbestos)
A clear space or ___ to ____ inches above and below the top and bottom of the connecting hardware should be left for cable handling
5 to 6 inches
Racks, cabinets or enclosures are recommended to have a height of _____ and have a rail size and top flange width of ____
7’ and 19”
Mounting holes on racks and whatnot should consist of two equipment holes ____ inches apart per ru with ____ inch of space between ru’s
1.25in and .50in
When additional width is required for special equipment, racks/cabinets with a width of _____ inches should be considered
23 inches
A TR is
an enclosed space (ROOM) for housing telecom equipment, cable terminations and cross connects
A TE is
a case or housing for telecom equipment, cable terminations and cross connects
Types of cabling facilities that may be housed in the TRs include
HC - Horizontal Cross Connect
IC -
MC -
The primary function of the TR and TE is to
house the horizontal cross connects.
Though. it may also include backbone cabling, active equipment and more
If the building is smaller than ____, it may be served by shallow rooms.
5,000 sq ft
If the building is smaller than _____, it may be served by wall cabinets, self-contained cabinets, or enclosed cabinets.
1,000 sq ft
How much space should be allocated for each 4-pair balanced twisted pair circuit to be patched or cross connected?
4 sq in
Note when cabling requires surge protection, the recommended space allocation is two to four times larger than this for cross-connections
How much space should be allocated for each optical fiber core/strand to be patched or cross connect?
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
Define a telecommunications Enclosure (TE)
A TE is a case or housing for telecommunications equipment, cable terminations, and cross-connect cabling. Typically limited to Horizontal Cross-connect (Floor Distributors)
There should be at least one TR or ER per floor. If the usable floor space to be served exceeds ____, consider additional TRs.
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 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.
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.
(4) 4”
