Lesson 1 (Structured Cabling) Flashcards
Structured cabling is defined as?
A telecommunication cabling system that consists of a number of standardized smaller subsystems
What are the three categories of structured cabling
Voice
Data
Video
The integration of media ( voice, data, video) onto common medium (UTP,COAX,fibre) is called?
Convergence
What does WAN stand for
Wide area network
What does MAN stand for
Metropolitan area network
What does LAN stand for
Local area network
Where the service provider terminates is called?
Point of demarcation or demarc
On drawings the technical name for a demarc would be?
NID
In commercial and industrial the demarc is sometimes called?
Node zero
The arrangement of linking networks is called what?
Topology
What are the two basic types of topology
Physical and logical
What kind of topology has to do with the physical layout of devices including the cable installation
Physical
What topology is how data is actually transfered within a network also known as protocol
Logical
How many topologies are there total
7
What kind of network has all nodes connected to a common transmission medium or cable called a trunk
Linear bus
Linear bus advantages
Easily disconnect nodes
Linear bus disadvantages
Not reliable
If the trunk cable is down everything is down
What network l; all devices on this network connect to a central point. The central point or hub then re directs the signal to the proper destination
Star
Star network advantages
Easy to add additional devices with no service interruption
Star network disadvantage
The hub represents a single point of failure…. Not reliable
What network; devices in this system are connected in a large ring of a closed loop
Ring network
Advantages of a ring network
System performs better under heavy network load and the server does not need to manage connectivity to each device
Disadvantage of a ring network
One bad workstation and the system goes down.
Making any changes will also affect network operation
What network; allows for many servers and the ability to branch out the network in many ways
Tree or expanded star
Advantages of a tree network
Easy to add more nodes; reliable network and some level of redundancy with multiple servers
Disadvantage of a tree or expanded star
The overall length of each segment is limited. (100m) More difficult to wire than other topologies
Ok what network; each network device is interconnected with one another. It allows the most transmissions to be distributed even if one of the connections go down.
Mesh
What network; the data hops from one node to the other until the destination is received. Commonly used for wireless networks(wifi)
Mesh
Mesh disadvantage
Disadvantages: expensive to have this if it is a physical connection
What network or topology does not have a single point of failure.
Hybrid a combo of two or more topologies
What topology is the most reliable
Hybrid
What are the two types of protocol
Ethernet
Token ring
What cabling; vertical cabling, running of communication lines between floors or between buildings. Cables are consolidated at different points, then distributed through the building
Backbone cabling
For backbone cabling what kind of cable if preferred
Fibre
What standard has become the model for most premise cabling
568 standard
What allows installing the full cabling network without regard to its ultimate use
568 standard
The 568 standard will support __________,_____________and__________ over short distances of ________
Voice data and video
100m
Cabling in a building can be divided into what two sections
Backbone and horizontal
What kind of cabling; from the TR’s. Each floor these cables now run to different workspaces on the same floor
Horizontal cabling
The horizontal standard limits the length of the horizontal cables to _________m
100m
Most common cables for cabling would be
Cat 5E
Cat 6
What are points where the cables are connected. Forms demarcation between different parts of the cabling system.
Cross connects
T or F the characteristic impedance of a cable is a measurement of its resistance
False
Impedance is largely determined by the cable what?
Insulation capacitance
T or F the length of the cable effects it’s impedance
False
T or F distortion of the insulation by excessive pulling, kinks, crimps from fastening do effect the impedance
True
Impedance is frequency dependent
T or F
True
T or F all components in a system must have the same characteristic impedance or losses will occur
True
T or F
Damage, shorts, opens or any mismatch causes reflected signals which can cancel out the main signal
True
Most common impedances of coax
75
50
Most UTP have an impedance of
100
What is the most common cable in networking
UTP
What is the difference between cat 5e and cat6
Twist rate
UTP is typically what size
22 awg
Advantages of a UTP
Inexpensive simple to install
Disadvantage of a UTP
Subject to interference
Limited bandwidth
What UTP has a shield surrounding all wires
Screened twisted pair
What is the main purpose of a screened twisted pair
Greater immunity to outside noise or EMI
Advantages of a screened twisted pair
Less interference from EMI
Disadvantage of a screened twisted pair
More expensive
Harder to terminate
Difference of a shield twisted pair than a screened twisted pair
Shielded has individual wrapped wire sets
The shield on the shielded twisted pair allows?
Higher bandwidth and longer distances than sctp and utp
What cable offers the best high frequency performance of all copper cables
Coax
The components of a coax are coaxial which means?
They share the same axis
On a coax the signal travels down the __________ and returns on the ________________
Center core
Metallic shield
What is the purpose of the shield of a coax
Confine the energy within the cable
Biggest problem of a coax?
Poor connections at the ends
Advantages of a coax
Easy to install
Low attenuation
Greater bandwidth
Highky resistant to interference
Disadvantage of a coax
Expensive
Bulky
RG for coax stand for
Radio grade
Difference ein RG 6 and rg 59
RG 6 has a larger core thicker insulation and 2-4 layers of shielding
What cable transmits photons through air
Optic fibre
What cable span long distances and provide the backbone to many systems
Fibre optic
Fibre cables use what? Instead of electronic pulses
Light pulses
What does the transmitter do for fibre optic
Converts the digital signal into the equivalent light
What does a receiver do for fibre optic
An optical detector converts the pulses back into a digital signal ones and zeroes
Advantages of a fibre optic
Speed
Bandwidth
Distance
Resistance
Secure
Light weight
Maintenance
Two different types of fibre optic
Multimode
Single mode
Single mode optic allows
Higher bandwidth for longer distances
Single mode is more expensive than multimode true or false
True
Multicore allows
Higher bandwidth for short distances
In multimode disadvantages
Can distort and deliver incomplete data at long runs
Cable tray access is important how much height is required
1’
