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Wireless Networks

A wireless network is any type of computer network that uses
wireless data connections for connecting network nodes.

A wireless network is similar to a wired network, but instead
of using cables, it communicates using radio frequency signals.

Divided into 3 main categories:

system interconnection

Wireless LANs

Wireless WANs
 System interconnection means interconnecting the
components of a computer using short-range radio.
 Example: short range wireless n/w  bluetooth.
 Allows digital cameras, headsets, scanner & other
devices to connect to a computer by merely being
brought within range.
 No cables, no driver installation, just put them down,
turn them on & they work .
 System interconnection n/w use the master-slave
paradigm.
 System unit is normally the master, talking to the
mouse, keyboard, etc., as slaves
Bluetooth configuration
Wireless Local Area Networks
Wireless and wired LANs. (a) 802.11. (b) Switched Ethernet.
Master tells the slaves what addresses to use, when they can broadcast,
how long they can transmit, what frequencies they can use, & so on.
WIRELESS LANs
These are the systems in which every computer has a radio modem &
antenna with which it can communicate with other systems.
WLANs are becoming common in small offices & homes (installing
Ethernet is considered too much trouble), older office buildings, company
cafeterias, conference rooms, and other places.
Standard for the WLANs is IEEE 802.11.
Example: cellular telephones low-bandwidth wireless system.

 3rd generations are there:
 first gen. – analog & for voice only
 second gen. – digital & for voice only
 third gen. – digital & is for both voice & data.
 here distance involved are much greater & the
bit rates much lower.
 WLANs can operate at rates up to 50 Mbps over
a distances of tens of meters.(cellular n/w operates
below 1 Mbps)
WIRELESS WANs
Used in wide area systems.
High-speed wireless n/w
Almost all wireless n/ws hook up to wired n/w at some
pt. to provide access to files, databases, & the Internet.
Home Networks
Idea: in future most homes will be set up for networking.
Every device in the home will be capable of communicating
with every other device, & all of them will be accessible over
the Internet.
Categories:
 computers (PC, notebook PC, shared Peripherals)
 entertainments (TV, DVD, VCR, CAMERA, MP3)
 telecommunications (telephone, mobile telephone, fax)
 appliances (microwave, refrigerators, lights)
 telemetry (utility meters, smoke/burglar alarm)
Home computer n/w is already there.(limited)
 have a device to connect multiple computers to a fast
Internet connection.
 Home networking has some fundamentally different
properties than other network types.
 First, the n/w & devices have to be easy to install.
 Second, the n/w & to be foolproof in operation.
 Third, low price is essential
 Fourth, the main application is likely to involve
multimedia, so the n/w needs sufficient capacity.
 home n/w will require better performance than
that of existing office n/ws & expand the reach of the
n/w gradually.
 Fifth, it must be possible to start out with one or
two devices & expand the reach of the n/w gradually.
 Sixth, security & reliability will important.
 Home networking offers many opportunities &
challenges.
INTERNETWORKS
 Many n/ws exist in the world –with different hardware &
software.
 People connected to one n/w often want to communicate
with people attached to a different one.
 Fulfillment of this requires different, & frequently
incompatible n/ws, be connected, sometimes by means of
machines called gateways to make the connection &
provide the necessary translation, both in terms of
hardware & software.
 A collection of interconnected networks is called an
internetwork or internet.
 A common form of internet is a collection of LANs connected by
WAN.
Network Hardware
Classification of interconnected processors by scale.
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INTRODUCTION TO WIRELESS NETWORK AND ITS EXPLANATION

  • 1. Wireless Networks  A wireless network is any type of computer network that uses wireless data connections for connecting network nodes.  A wireless network is similar to a wired network, but instead of using cables, it communicates using radio frequency signals.  Divided into 3 main categories:  system interconnection  Wireless LANs  Wireless WANs
  • 2.  System interconnection means interconnecting the components of a computer using short-range radio.  Example: short range wireless n/w  bluetooth.  Allows digital cameras, headsets, scanner & other devices to connect to a computer by merely being brought within range.  No cables, no driver installation, just put them down, turn them on & they work .  System interconnection n/w use the master-slave paradigm.  System unit is normally the master, talking to the mouse, keyboard, etc., as slaves
  • 4. Wireless Local Area Networks Wireless and wired LANs. (a) 802.11. (b) Switched Ethernet.
  • 5. Master tells the slaves what addresses to use, when they can broadcast, how long they can transmit, what frequencies they can use, & so on. WIRELESS LANs These are the systems in which every computer has a radio modem & antenna with which it can communicate with other systems. WLANs are becoming common in small offices & homes (installing Ethernet is considered too much trouble), older office buildings, company cafeterias, conference rooms, and other places. Standard for the WLANs is IEEE 802.11. Example: cellular telephones low-bandwidth wireless system.   3rd generations are there:  first gen. – analog & for voice only  second gen. – digital & for voice only  third gen. – digital & is for both voice & data.
  • 6.  here distance involved are much greater & the bit rates much lower.  WLANs can operate at rates up to 50 Mbps over a distances of tens of meters.(cellular n/w operates below 1 Mbps) WIRELESS WANs Used in wide area systems. High-speed wireless n/w Almost all wireless n/ws hook up to wired n/w at some pt. to provide access to files, databases, & the Internet.
  • 7. Home Networks Idea: in future most homes will be set up for networking. Every device in the home will be capable of communicating with every other device, & all of them will be accessible over the Internet. Categories:  computers (PC, notebook PC, shared Peripherals)  entertainments (TV, DVD, VCR, CAMERA, MP3)  telecommunications (telephone, mobile telephone, fax)  appliances (microwave, refrigerators, lights)  telemetry (utility meters, smoke/burglar alarm) Home computer n/w is already there.(limited)  have a device to connect multiple computers to a fast Internet connection.
  • 8.  Home networking has some fundamentally different properties than other network types.  First, the n/w & devices have to be easy to install.  Second, the n/w & to be foolproof in operation.  Third, low price is essential  Fourth, the main application is likely to involve multimedia, so the n/w needs sufficient capacity.  home n/w will require better performance than that of existing office n/ws & expand the reach of the n/w gradually.  Fifth, it must be possible to start out with one or two devices & expand the reach of the n/w gradually.  Sixth, security & reliability will important.  Home networking offers many opportunities & challenges.
  • 9. INTERNETWORKS  Many n/ws exist in the world –with different hardware & software.  People connected to one n/w often want to communicate with people attached to a different one.  Fulfillment of this requires different, & frequently incompatible n/ws, be connected, sometimes by means of machines called gateways to make the connection & provide the necessary translation, both in terms of hardware & software.  A collection of interconnected networks is called an internetwork or internet.  A common form of internet is a collection of LANs connected by WAN.
  • 10. Network Hardware Classification of interconnected processors by scale.