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Session 23 DATA TRANSMISSION CABLES
Pedro Mengual GarcíaPedro Luis Vera Muñoz
Carlos Vélez AlacidEstela Rodríguez Sánchez
INDEX
1. Introducción2. Twisted Pair
• UTP• STP
1. Coaxial Cable2. Fiber Optic3. Conclusion
Introduction
What are the data transmission cables? Wires are the medium through which information moves from a
network device to other.
Main features Speed Distance Interference inmunity Security Installation complexity Total cost (material and workmanship)
Twisted Pair
Why is called twisted pair?Each pair consists of:– 2-wire copper (a pair of wires)– Isolated from each– In spiral (twisted with each other)– To prevent external interference
There are two types: UTP and STP
Twisted Pair: UTP
Unshielded Twisted Pair.
The quality of UTP may vary from telephone-grade wire to extremely high-speed cable
UTP cables are found in many Ethernet networks and telephone systems
The cable has four pairs of wires inside the jacket.
Each pair is twisted to help eliminate interference from adjacent pairs and other electrical devices.
Twisted Pair: UTP
Twisted Pair: UTP
CATEGORY BUSINESS USE1 Voice only. (Telephone wire)
2 Data to 4 Mbps (LocalTalk)
3 Data to 10 Mbps (Ethernet)
4 Data to 20 Mbps
5 Data to 100 Mbps (Fast Ethernet)
5e Data to 1000 Mbps (Gigabit Ethernet)
Twisted Pair: STP (SHIELDED TWISTED PAIR)
Front view
Outer jacket
Individual shieldTwisted pair
Insulated copper wire inside a protective mesh
Side View
Overall shield
Outer jacket
Twisted pairPair shields
Twisted Pair: STP (SHIELDED TWISTED PAIR)
Each pair of wires is individually shielded with foil.
It´s suitable for environments with electrical interference
Protection against noise
Used in Token Ring and Ethernet networks
Very rigid (inflexible)
Twisted pair - Connectors
crimp
RJ-45 connector
Utp VS Stp: Advantages and Disadvantages
UNSHIELDED(UTP)
SHIELDED(STP)
ADVANTAGES- Is the most used- Cheap- Easy to install
ADVANTAGES- Metal mesh (outer jacket)- Great protection against noise
DISADVANTAGES- External Interferences
DISADVANTAGES- Expensive- More difficult to install- More difficult to handle (thick)
COAXIAL CABLE
Used to:– Primary type by the
Cable TV.
– For computers Networks.
COAXIAL CABLE: Types
There are two types ThinNet: Thin coaxial cable ThickNet: Thick coaxial cable
ThinNet ThickNetADVANTAGES• More Flexible• Easier to work it.
ADVANTAGES
• Protection against the noise
DISADVANTAGES• Its less inmune against the noise than ThickNet
DISADVANTAGES
• Very rigid and difficult to work it.
COAXIAL CABLE CONSISTS OF...
COAXIAL CABLE: Parts
PARTS:1. A PVC sheath: Protection 2. A copper braided shield: Block outside
interferences.3. A plastic layer: Insulation4. A copper wire core: Data transmission
COAXIAL CABLE CONNECTORS
Designed to maintain a coaxial form.
Plated with high-conductivity metals (silver or gold)
FIBER OPTIC CABLE: PARTS
A Silica fibre core. Because light transmission.
Cladding: It confines the light to the core.
Kevlar fiber: Protective layer. Coating: Pvc or Teflon
because of the insulation.
FIBER OPTIC CABLE
Single-mode fiber:
-Small core.
-Light is propagued one way
-Faster
-Expensive
-Long distances (400km maximum)
Multi-mode fiber
-Various modes or ways.
-Bigger core
-Short distances.(Less than 1km)
-Installation simple and cheap.
-Slower than single-mode fiber
Multi-modeSingle-mode
FIBER OPTIC CABLE
CONCLUSION
• Best Cable?:It depends on what, the most expensive is not allways the best.
• Fastest Cable?:Fiber optic reach higher bandwidth.
• Price:Twisted pair is the cheap, fiber optic is the most expensive.
• Choosing cable:Consider the benefits against the investment.Size of the network.According to the necessity
THANK YOU!