MEDIUM FOR TRASMISSION DATA

ROZANA DIANA AHMAD RUSLI

It consists oftwo wires or conductors twisted together, eachwith its own plastic insulation. Used RJ45 connector

COAXIAL CABLE

COAXIAL CABLE

• consists of a center wire surrounded by insulation and then a grounded shield of braided wire. The shield minimizes electrical and radio frequency interference.

• Coaxial cabling is used by the cable television industry and is also widely used for computer networks, such as Ethernet.

FIBRE OPTIC

• The fibre optic cable is a networking medium that uses light for data

• Its core consists of dozens or hundreds of thin strands of glass or plastic which uses light to transmit signals.

• Each strand, called an optical fibre, is as thin as a human hair.

FIBRE OPTIC

RADIOWAVES / MICROWAVES

Frequencies3 KHz TO 1 GHz

Frequencies1 GHz to 300 GHz

RADIOWAVES MICROWAVES

Frequencies300 GHz TO 400 THz

Frequencies 2400-2480 MHz

Distance10 Meter

Connections are so fast (10 times faster than modem)Internet Satellite : StarBand, Pegasus Express, Teledesic and Tachyon.Satellite used for broadcasting and internet communication

Its MALAYSIA have own satellite???

http://upload.wikimedia.org/wikipedia/commons/6/63/USA.NM.VeryLargeArray.02.jpg

MODEM

1. To transmit data over telephone or cable line2. Convert data signal :Computer (digital) telephone line (analog)telephone line (analog) Computer (digital)

INTERNALFOR DESKTOP PC

XX

Digital signal Digital signal

Analog signal

Enables the computer to access the network.

Transmit data to correct destination on the network

Allow computers to transfer data.

USB wirelessAdapter

ACCESS POINT

V

HUB / SWITCH

Used to connect computer or devices on LAN (local area network)

HUBSWITCH

Z Z

X

Internet

IDENTIFY THE X,Y Z DEVICES ?

Y

W

Internet

ZZ

X

Y

X

Y

Z

W

X