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!