Wireless networking presentation (Introduction)

1. Wireless Networking
By :- ADITYA RAJ
Roll :- 39/cse/15005

2. Introduction
 What is a wireless network?
 Wireless network is an interconnection of many
systems capable of providing service to mobile
users within a particular geographic region
(country or continent)

3. Radio Frequency signal (RF signal)
 RANGE : 30KHz to 300GHz
 This Signal is fall under the category of EM Waves
 This signal is invisible and use to send messages from
one device to another device
 USES : FM radio station uses RF signals to broadcast
signals and the frequency is used as the
station name like (93.8 Red FM)

4. Advantages of Wireless Network
over Wired (Cabled) Network
 Mobility: Users can roam around the network without being
disconnected
 Installation speed and cost: Building wireless medium to
large network is usually faster and cheaper than building wired
(cabled) medium to large network because there is no need to pull
cable through walls and ceilings
 Reach of network: Wireless network can be extended to
places where wire/cable cannot reach
 Flexibility/scalability: New computers can be added easily
without having to pull cable into the computers

5. Disadvantages of Wireless Network
compared to Wired Network
 Speed: In general, wireless network technology is
slower than wired network technology
 Security: In general, wireless network is less secured
than wired network

6. Wireless Network Mode
 Ad-Hoc Mode (Peer-to-Peer Mode)
 Each wireless node can communicate directly with each of the
other nodes in the network (without Wireless Access Point)
 Mesh network topology
Infrastructure Mode
 All wireless node communicate to one another via Wireless
Access Point
 Star network topology

8. Different Wireless Networks
 IrDA (Infrared Data Association)
 Uses beams in the infrared light spectrum
 Bluetooth
 Uses 2.45 gigahertz radio waves,
 Limits distance 10 to 100meters, but travels through walls
 HomeRF (SWAP) – developed by businesses
 6 voice channels and 1 data channel
 Slow, and limited range, but cheap
 WECA (Wi-Fi)
 “Wireless Ethernet Compatibility Alliance”

9. IrDA (Infrared Data Association)
 Uses beams of light in the infrared
spectrum
 Remote controls
 Fairly reliable and low-cost
 Drawback: “one-to-one” technology
 You can send data only between two things at once
(but increased security?)

10. HomeRF (SWAP)
 Shared Wireless Access Protocol (SWAP)
 Developed by an alliance of businesses
6 voice channels and one data channel
 The data channel is the 802.11 wireless-Ethernet
specification by the IEEE
 One drawback: SWAP can only be used
with computers
Printers and such need to be attached to a
computer and used as a resource