Page 11 - Code Craft Computer-8

b. Wi-Fi: Wi-Fi stands for Wireless Fidelity. It is the name of a
popular wireless networking technology that uses radio waves
to provide wireless high-speed Internet and network

connections.
Wi-Fi networks use radio technologies to provide secure,
reliable and fast wireless connectivity.

Infrared Technology: Infrared technology is used to send
documents from portable computers to printers, to connect
home entertainment systems, and to exchange information

between computers, cellular telephones and faxes. The communication range of the devices
communicating through infrared waves is very limited. These waves cannot penetrate walls or
other obstructions; so there should be no physical barrier between the communicating devices. A
television and a remote control are connected through infrared waves.

Extra Bytes

In 1800, Infrared waves were discovered by the astronomer William Hershel .

Microwave Transmission: For long distance communication, microwave radio transmission is
widely used as an alternative to coaxial cable. The main advantage of the microwave transmission
is that building a tower is cheaper than laying cable. Microwaves can pass through the Earth’s
atmosphere easily, and can be used to transmit information between satellites and the Earth’s base
station.

NETWORK TOPOLOGIES
The approach of connecting different computers in a network is known as Topology. Network

topology is an arrangement or layout in which various computers are connected to one another.
On the basis of network topology, network can be classified into five main types:

Bus Topology

In Bus Topology, a single cable known as backbone or bus carries
all the data (traffic). Communication travels in both the directions
along the line, and can be received by any workstation. All the
computers, printers and other peripheral devices that are being

shared are connected to the bus. This topology is normally used
for small network.

Advantages

1. Failure of any computer or device does not affect others.
2. It is easy to install and economical, as it consumes a single communication cable.

3. A new PC can be easily connected to the existing network with just a short cable.

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