Test 4 - Structured cable Flashcards
Who establishes the flame rating for cables?
NEC
floor pathways
underfloor duct
cellular floor
raised floor
underfloor conduit
Who develops procedures for testing cables?
UL - Underwriter laboratories
near end cross talk causes
poor termination
untwist pairs to much at termination
Where a telecommunications conduit is to be terminated in a device exposed to weather, care shall be taken to prevent the ___.
Ingress of moisture.
When a pair of wires is twisted, each of the wires will have nearly identical ___ with respect to ground. This results in almost no difference in the levels of ___ between the two wires
Electrical characteristics, induced voltage
___ protection is provided either by heat coils or fuses.
over current
The performance requirements for Class F^ cables, connectors, basic links and channels are specified at frequencies between ___ Mhz.
600 to 1000
The two types of underfloor ducts are:
Single level, Two level
___ is the ratio of the worst-case attenuation of pairs in a cable to the worst-case pair-to-pair NEXT.
Attention to crosstalk ratio (ACR)
830
multimedia
primary and secondary in CAT
tip - primary
ring - secondary
The performance testing requirements for Category 5 cables, connectors, basic links and achannels are specified at frequencies up to ___ Mhz.
100
The two conductors of a twisted pair are normally referred to as the ___ and the ___?
Ring conductor, Tip conductor
___ is the undesired coupling of signal energy from a transmitting pair into a receiving pair.
crosstalk
Fiber bandwidth ___ (can/cannot) be adversely affected by installation procedures.
Cannot
Category 5e cables exhibit ___ insertion loss than Category 3 cables.
lower
For 8-pin modular outlets, ____ is expressed in terms of worst case pair to pair crosstalk.
NEXT
For a given cable, as frequency increases, NEXT ___ (increases/decreases).
decreases.
For a given 8-pin modular outlet, as frequency increases, NEXT ___
Decreases
TIA standard methods for terminating twisted pair cables on 8-pin modular outlets
568a
568b
The performance requirement fo Category 3 cables, connectors, basic links, and channels are specified at frequencies up to ___ Mhz.
16
A plaster or drywall ceiling or other inaccessible areas ___ be used as distribution pathways.
shall not
Modular patch panels are popular for
data
___ inserts are factory-installed while ___ inserts are field-installed. All inserts should be ___ when service fittings are removed.
Preset, after set and capped.
___ is a measure of how much a signal is reduced in amplitude or strenth as it is carried over a twisted pair or fiber.
Insertion loss
Multi-conductor cables are ___?
for application dependent cabling.
What kind of firestops incorporate metal frames containing elastomeric modules fitted to the cables with some method of applying compression to the assembly?
Mechanical firestops
___ is the undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair.
Power sum, attention to crosstalk ratio, far end
Popular coaxial fittings include the ___-type(used extensively for cable TV), the ___-type(used in most data coaxial applications), and the ___-type(used for thick Ethernet).
F, BNC and N.
A(n) ___ or ___ shall be placed in installed conduits.
Pull string, rope
In computer and equipment rooms, a floor system with modular panels supported by pedestals, with or without stringers, in called a(n) ___.
Access floor / Raised floor
A(n) ___ is typically installed at each end of a UTP backbone cable which has a corrugated aluminum shield over the core for the purpose of grounding the cable.
Bonding Clamp
Define delay skew.
Delay skew is the difference in the delay time for each of the pairs in a 4-pair cable.
By allowing each of the pairs in a twisted pair cable to have a different twist lenth, the degree of ___ is reduced.
Pair to pair capacitive coupling.
___ has cells that become the distribution raceways. There are two types: ___ and ___.
Cellular floor, Steel and Concrete
By allowing each of the pairs in a twisted pair cable to have a different twist length, the degree of ___ is reduced.
Pair to pair copacitive coupling
The performance testing requirements for Category 6e cables, connectors, basic links and channels are specified ast frequencies up to ___ Mhz.
350-550
Overvoltage protectors for use on UTP cables are designed to provide a(n) ___ path to ground.
low resistance
List some guidelines that should be followed in general, but especially for Category 5e installations.
Do not untwist pairs. Remove as little jacket as necessary.
never bend kink or flatten
Return Loss is measured in ___, with a higher number meaning a better cable.
DB
Patch cords are primarily used for cross-connecting circuits in ___ environments.
data
Conduit shall be ___ to eliminate sharp edges and terminated with a(n) ___.
reared, insulated bushing
___ is the ration of the worst-case attenuation of pairs in a cable to the worst-case pair-to-pair NEXT.
attenuation to crosstalk ratio (ACR).
Parameters used for defining the performance of cables and cpmponents are specified using the ___ as a unit of measurement.
decibel (db)
A typical 100-pair 110-type terminal block can accommodate the termination of a maximum of ___ 4-pair cables.
24
Type 1 cable constists of ___ twisted pairs, each individually shielded with ___, with a(n) ___ outer shield surrounding the entire cable core and covered with a jacket.
22, Foil and Braided.
List the four inter-building pathways.
Underground, Buried, Aerial and tunnel
A conduit of ___ minimum diameter shall be used to interconnect telecommunications rooms located on the same floor.
3”
For a given twisted pair cable, as frequency increases, crosstalk performance ___.
decreases
Define the word plenum
a compartment or chamber to which one or more air ducts are connected which forms part of the air distribution system
Conduit through the floor shall be terminated ___ above the floor surface.
1 to 3 inches.
PSACRF
The undesired coupling of signal energy from a number of simultaneous-transmitting pairs into a receiving pair
___ is the undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair, measured at the opposite end of the cable from where the transmitter is located.
PSACRF
300 pair terminal block is ____ type
110
delay skew
the disparity in the propagation delay between any two pairs within the same cable. (shorter and longer pairs)
With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:
Riser within an office building
CMR
For 8-pin modular outlets, NEXT is expressed in terms of worst case ___ crosstalk.
Pair to Pair
List the methods of fire stopping
mechanical devices putty caulks cementious mortars and grouts sprays intumescent wraps pillows bags and blocks silicon fomes
___ is the reduction of optical power as it propagates through an optical fiber.
attenuation
___ are pathways embedded in concrete for cables and wires for services such as telecommunications and elecrical.
Underfloor duct system
when a pair of wires is not ttwisted, each of the wires will not have identical ___ with respect to ground. This results in ___ levels of induced noise voltage on each of the wires.
Electrical characteristics, different
Horizontal cable length maximums
patch panel to jack 90 meters
patch cord 10 meters
horizontal pathways in ceiling
home run
zone
raceway
pokethrough
The NEC requires cables to pass a test for combustion toxicology in order to be listed for plenum use?
No it has to meet UL standards
Define ACRF
Attention to crosstalk ratio Far end.
crosstalk loss which is the undesired signal coupling between adjacent pair at the far end or cabling or a component.
A(n) ___ consists of up to 90 meters of horizontal cabling, a connection at each end, up to two meters of test equipment cord from the main unit of the field tester to the local connection, and up to two meters of test equipment cord from the remote connection to the remote unit of the field tester.
Permanent link test configuration
In order to allow both telecommunications and power cables in a cable tray or cable runway, they must be ___, as required by the Electrical Code.
Divided with barrier to allow separation between the two.
Telecommunications rooms shall be provided with the following (List 7 items):
1 wall with 3/4 in plywood no false ceiling 2 20 amp 120v outlets 36x80 in door access access to outside GEC painted light color to eliminate dust 50 foot candles 3 ft off the door
List the types of cables recognized for use in a horizontal cabling system.
4 Pair 100 Ohm unshielded twisted pair.
4 Pair screened twisted pair. (SCTD)
2 Fiber mullti-mode optical fiber cable, either 32.5/125 or 50/125mm.
COAX
With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:
Stud wall within an office building
CM
When cables are placed above a ceiling and conduits or cable trays are not used, the cables shall have supports located on ___ center.
5 foot
For a given cable, as frequency increases, attenuation ___
increases
There are ___ pairs in each binder group of a multi-pair UTP backbone cable.
25
For a given twisted pair cable, as frequency increases, attenuation ___.
increases.
770
fiber
A horizontal run of conduit can serve a maximum of ___ outlets.
3
Equipment rooms shall be located away from ___, such as transformers, motors and generators.
electromagnetic interference
With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:
residential basement
CMX
return loss
the ratio of transmitted signal to the reflected signal of cabeling expressed in dB.
The performance requirements for Category 6 cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.
250
fiber connectors
st sc lc
List five pathways and/or spaces recognized by the 569-B Standards for Single Tenant buildings.
Wireless service entrance pathway, Back bone pathway, Horizontal pathway, Tie pathway, Access provider space and Service provider space.
Overvoltage protectors for use on UTP cables are designed to provide a(n) ___ path to ground.
low resistance
A structured cabling system is a(n) ___?
cohesive way of organizing a cabling system.
The bandwidth of a multi-mode fiber is expressed in ___.
MHz per KM
Backbone pathways shall not be located in ___.
Elevator shaft.
Which type of overvoltage protection operates faster than conventional protectors, provides balanced operation and is more reliable than conventional protectors units?
Solid State
___ set the minimum requirements for installing conduit.
Appropriate electrical code.
Define propagation delay
Propagation delay is the length of time it takes for a signal to travel to its destination.
66 block how many cables
12 4 pair cables
For a given outlet, as frequency increses, attenuation ___.
Increase
NEXT is the undesired coupling of energy from the ___ pair into the ___ pair.
Transmitting conductor pair, receiving conductor pair.
Return Loss is measured in DB with a higher number meaning a ___ cable.
better
With regard to communications cables, what designation is expected to be printed on a cable listed for use in a:
Plenum of an office building
CMP
List some uses for multi conductor cable
A syncronous data terminal. Electronic access control system. Fire alarms. Security systems. Environmental controls. Nurse call systems.
Power and telecommunications cables installed in tray shall be installed per the ___.
NEC
___ conduit is not recommended because of cable abrasion problems and the length should be less than ___.
Flex and 20’.
The minimum bend radius, under no-load conditions, for a 4-pair UTP cable shall be ___ times the cable diameter.
4
Within a 300 pair UTP backbone cable, there are ___ binder groups. Show work.
300/25=14 binders
In high-speed data environments, connections among terminal blocks, patch panels and equipment ports is usually accomplished with ___.
UTP patch cords
In horizontal cabling, bridged taps are ___
Not allowed
A problem with traditional carbon block protectors is that a build-up of carbon dust can cause a(n) ___ for the conductor it is supposed to protect.
path to ground
___ cables are used in vertical passages connecting one floor to another
Riser
___ is a measurement of the amount of signal energy that is reflected back to a transmitter as it travels down a twisted pair, encountering impedance discontinuities.
Return loss
EO
equipment outlet
List the three parts of a 110 block.
Mounting legs, wiring block and connecting block.
800
telephone
725
data transmission
Category 5e outlets exhibit ___ attenuation than Category 3 outlets at 16 Mhz.
Lower
___ boxes are intended to be used for splicing in addition to being used for pulling cable.
Splice
What method of fire stopping should be considered when there is and area where cable activity occurs on a regular basis?
pillows
What’s the purpose of fire stopping
prevent the spread of fire, smoke,water through a fire rated wall or floor. restore fire rating after penetration.
What kind of cables can be used in office spaces to connect from a wall jack to a computer?
Communications General Purpose Cables
820
cable tv
8 pin to pair relationships
conductor color
568a
568b
white, blue, orange, green, brown
A
5, 4, 3, 6, 1, 2, 7, 8
B
5, 4, 1, 2, 3, 6, 7, 8
110 block how many cables
24 4 pair cables
A building owner wishes to have several telecommunications cables and some power cables direct buried between two buildings located on his property, separated by a distance of 130 feet. In which document will you look for safety requirements for this installation?
NEC safety manual
The undesired coupling of signal energy from a number of simultaneously-transmitting pairs into a receiving pair is expressed in terms of ___.
Power sum attenuation to crosstalk ratio.
For 1/2” to 2” conduit, the minimum bend radius shall be ___ times the diameter of the conduit. For conduit over 2” in diameter, the minimum bend radius shall ___ times the diameter of the circuit. For conduit containing fiber optic cables, the minimum bend radius shall be ___ times the dimeter of the conduit.
6, 10 and 10.
Telecommunications systems, media and buildings are ___.
Dynamic
Who publishes the NEC every three years?
NFPA - National fire protection association
backbone cabeling
cable connecting hardware between telecommunication rooms, equipment rooms and entrance facilities
Pull boxes ___ be used for splicing cables over 2.5” in diameter.
shall not
The total opposition to alternating current flow of a twisted pair is called the ___?
Impedence
A minimum of ___ of headroom shall be provided and maintained above a cable tray.
1 foot
The performance requirements for Category 5e cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.
100
760
fire alarm
What connector is used most often in broadband data applications
F-Type
For what is putty fire stopping ideal?
Providing and instant fire stop and retrofitting work in occupied areas.
___ is the undesired coupling of signal energy from a transmitting pair into a receiving pair, measured at the opposite end of the cable from where the transmitter is located.
Power sum, attention to crosstalk ratio, for end
No section of conduit shall be longer than ___ or contain more than ___ 90* bends between pull points or boxes.
100ft
2
50 pair terminal block is ____ type
66
The performance requirements for Category 6^ cables, connectors, basic links and channels are specified at frequencies up to ___ Mhz.
500
Generally, the minimum finished floor height of an access floor is ___. However, when the area under the floor is used as a plenum for HVAC, such as in a controlled computer room, the minimum finished floor height should be ___.
6”, 12”
A(n) ___ consists of up to 90 meters of horizontal cable, a work area equipment cord, a telecommuications outlet, an optional consolidation connection close to the work area, and two cross-connect connection in the telecommunications room
Channel test configuration
What connector is used most often in closed circuit TV applications
BNC
Header ducts in a cellular floor system are those ducts which connect the ___ to the ___.
Distribution cells, Telecom cells
The TIA/EIA-569 Standard is a(n) ___ document. The standard is subject to ___ and ___ as warranted vy advances in building construction techniques and telecommunications technology.
Living, revision and updating.
