Cabling Flashcards
What are the 2 types of copper cabling (and their acronyms)?
STP - Shielded Twisted Pair
UTP - Unshielded Twisted Pair
What is the MAC approach?
Moves, Additions and Changes
Simplicity in adds, moves or changes in installation configurations
What are the acronyms NEXT?
Near End Cross Talk
What are the acronyms FEXT?
Far end Cross Talk
What is the acronym MCC?
Main Cross Connect
What is the acronym MUTOA?
Multi-User Telecommunications Outlet Assembly
What is structured cabling?
A telecommunications design concept that uses a common cable type to support all applications running across it
When is MAC most effective?
When cabling a new premises
What 2 types of wiring configurations are used in SCS?
Vertical
Horizontal
What is meant by an evolved product?
Improved level of performance (Cat 5E or Cat 6)
What is meant by a revolutionary change?
An abrupt break with past technology (Copper to Fibre / Copper to Wireless)
When is vertical wiring used and what is the recommended cable to use?
To connect wiring closets between floors Single Mode Fibre recommended
When is vertical wiring used?
To connect the wiring closet to the wall jacks in each user location
What is the maximum length of a copper cable?
90m
What 4 things are included in the distance of horizontal wiring?
- The Cable
- The drop inside the wall
- The wall jack
- the patch cable from the wall to the PC
What does the acronym TIA stand for?
Telecommunications Industry Association
What does the acronym EIA stand for?
Electronics Industries Alliance
What is the commercial building telecommunication cabling standard?
TIA/EIA 568
Standards are important for 4 reasons, what are they?
- Properly installed cable will not cause connectivity failures
- Any trained installer can expand or repair a properly installed system
- Easy to retest
- Meets fire and electrical standards
What does the TIA/EIA 658 standard define?
How to design, build and manage a structured cabling system
A SCS is designed in blocks with very specific performance characteristics. How are those blocks integrated?
In a hierarchical manner to create a unified communication system
What physical components are defined by TIA/EIA 568?
Fibre Cable
UTP Cable
STP Cable
What is the rated channel performance for Cat 5E, Cat 6 and Cat 7?
Cat 5E - 100 MHz
Cat 6 - 250 MHz
Cat 7 - 600 MHz
What is the difference between stranded and solid cable?
Solid is made up of one 24-gauge strand of wire
Stranded is made up of 7 - 9 strands of copper that make up one 24-gauge conductor
A higher gauge means what?
A thinner wire
What are some advantages of solid conductor cable?
Less Expensive
Less Attenuation
Easier to punch down
What type of cable is recommended if the cable will have a lot of movement?
Stranded Cables
What is the impedance of shielded cable?
150 ohms
Twisted-Pair cabling has additional shielding to reduce what?
Crosstalk and other forms of EME
Which is more expensive between STP and UTP and why?
STP because it has much more protection
What physically provides the protection in a STP cable?
Each twisted cable is wrapped in foil
There is an inner braided copper mech contained in the outer insulating jacket
When is STP primarily used?
In networking environments with high levels of EMI
Cable carries what 2 fire ratings?
CSA Rating
UL Rating
What are the 5 cautions of UTP?
- Mutual Capacitance
- Characteristic Impedance
- Attenuation
- NEXT
- Singaling Rating
What is mutual capacitance?
Wires that are in close proximity causing a capacitive coupling effect between pairs
What is attenuation?
The loss of signal over distance travelled
What is near end crosstalk?
The measurement of a cable’s ability to reject crosstalk between pairs of wire at the near end of the circuit
Where is crosstalk the worst?
Points of termination
What is a megabit?
The amount (or speed) in which data is transferred One million bits (125KB)
What are megahertz?
The analog frequency of the carrier signal used to transmit the data
What is signaling rate and how is it measured?
The rate of change of the state of a digital signal Measured in Hz
What does signaling rate affect?
NEXT and Attenuation
What are the 2 types of lines?
Balanced & Unbalanced
What is a balanced line?
An electrical cable consisting of pairs of conductors that have identical electrical characteristics with respect to each other and with respect to ground
Example: Twisted-pair cabling used in 10Base T Ethernet
What is an unbalanced line?
An electrical cable in which the potential of the signal-carrying conductor is above ground while the return-path conductor is at ground potential
Example: Coaxial Cable
Why is four pair UTP recommended in new installations?
It supports voice and high-speed data transmission
What is the MCC (Main Cross Connect) and where is it usually located?
- Connection between the building backbones and 2. external connections
- Located on the ground floor
What are the two cabling methods with zone cabling?
- Multi-User Telecommunications Outlet Assembly (MUTOA)
2. Consolation Point
What company created the concept of zone cabling?
AMP Corporation
What is the zone cabling concept?
The open office area is divided into zones, with feeder cables running to a distribution point within each zone and short cable runs to each outlet. Zones are wired with reusable, pre-terminated cable assemblies
How many work stations are supported with zone cabling?
12
What are the colour codes for a 568A cable wiring?
Pin 1: white/green Pin 2: Green Pin 3: white/Orange Pin 4: Blue Pin 5: white/Blue Pin 6: Orange Pin 7: white/Brown Pin 8: Brown
What are the colour codes for a 568B cable wiring?
Pin 1: white/Orange Pin 2: Orange Pin 3: white/Green Pin 4: Blue Pin 5: white/Blue Pin 6: Green Pin 7: white/Brown Pin 8: Brown
