Your SlideShare is downloading. ×
0
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Wlan
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Wlan

626

Published on

Published in: Education, Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
626
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
22
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. SANDEEP.KAMATH FYIT,ROLL NO.18
  • 2. A wireless local area network (WLAN) links two or more devices using some wireless distribution method (typically spread- spectrum or OFDM radio), and usually providing a connection through an access point to the wider internet. This gives users the mobility to move around within a local coverage area and still be connected to the network. Most modern WLANs are based on IEEE 802.11 standards, marketed under the Wi-Fi brand name.
  • 3. Norman Abramson, a professor at the University of Hawaii, developed the world’s first wireless computer communication network. In 1979, F.R. Gfeller and U. Bapst published a paper in the IEEE Proceedings reporting an experimental wireless local area network using diffused infrared communications. The first generation of wireless data modems was developed in the early 1980s by amateur radio operators, who commonly referred to this as packet radio. The first of the IEEE Workshops on Wireless LAN was held in 1991. At that time early wireless LAN products had just appeared in the market and the IEEE 802.11 committee had just started its activities to develop a standard for wireless LANs.
  • 4. 1.STATIONS 2.BASIC SERVICE SET 3.EXTENDED SERVICE SET 4.DISTRIBUTION SYSTEM
  • 5. All components that can connect into a wireless medium in a network are referred to as stations. All stations are equipped with wireless network interface controllers . The basic service set (BSS) is a set of all stations that can communicate with each other. Every BSS has an identification (ID) called the BSSID, which is the MAC address of the access point servicing the BSS.
  • 6. An extended service set (ESS) is a set of connected BSSs. Access points in an ESS are connected by a distribution system. Each ESS has an ID called the SSID which is a 32-byte (maximum) character string. A distribution system (DS) connects access points in an extended service set. The concept of a DS can be used to increase network coverage through roaming between cells. DS can be wired or wireless. Current wireless distribution systems are mostly based on WDS or MESH protocols, though other systems are in use.
  • 7. •PEER TO PEER •BRIDGE
  • 8. An ad-hoc network is a network where stations communicate only peer to peer (P2P). There is no base and no one gives permission to talk. This is accomplished using the Independent Basic Service Set (IBSS). A peer-to-peer (P2P) network allows wireless devices to directly communicate with each other. Wireless devices within range of each other can discover and communicate directly without involving central access points. This method is typically used by two computers so that they can connect to each other to form a network.
  • 9. A bridge can be used to connect networks, typically of different types. A wireless Ethernet bridge allows the connection of devices on a wired Ethernet network to a wireless network. The bridge acts as the connection point to the Wireless LAN.
  • 10. 802.11 PROTOCOL RELEASE DATE FREQUENCY (GHZ) BANDWIDTH (MHZ) DATA RATE (Mbits/s) - JUN 1997 2.4 20 1,2 a SEP 1999 3.7 20 6-54 b SEP 1999 2.4 20 5-11 g JUN 2003 2.4 20 6-54 n OCT 2009 5 20 7-74 ac NOV 2011 5 160 6.93 (Gbits/s)
  • 11. • Time and labor costs associated with both wiring and installation of APs and associated networking infrastructure. • Higher performance, reliability, scalability and flexibility. • Seamless mobility between indoor and outdoor networks. • Highly helpful in the places where wires could not be set up for network.
  • 12. WLAN

×