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WiFi and Wimax
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WiFi and Wimax



Mihir Vora.

Mihir Vora.



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WiFi and Wimax WiFi and Wimax Presentation Transcript

  • WI-FI AND WIMAX Prepared by Mihir Vora -2033 L.D.R.P. Institute of Technology & Research
  • WIRELESS NETWORKWireless network refers to any type ofcomputer networks that is not connected bycables of any kind. It is a method by whichhomes, telecommunication networks andenterprise (business) installations avoid thecostly process of introducing cables into abuilding, or as a connection between variousequipment locations
  • Wireless Network Wireless Personal Area Networks - Up to 10 meter - IEEE 802.15.1 (Bluetooth) Wireless Local Area Networks - Up to 100 meter - IEEE 802.11 (WiFi)
  • Wireless Network Metropolitan Area and Wide Area Networks - Up to 50Km - IEEE 802.16 (WiMax)
  • What is Wi-Fi? Wi-Fi (Wireless Fidelity) is the technology that allows you to connect to the Internet at fast speeds without using wires. It also allows users to create their own LAN (Local Area Network) and conduct wireless data transmission between different network elements. Wi-Fi access can be set up in homes, offices, airports, hotels, coffee shops, convention centers, parks, public libraries, schools, etc… Wi-Fi can be used outdoor or indoor with CPE (Customer Premises Equipment) to amplify the signal. Wi-Fi operates in the 2.4 GHz and 5.8 GHz and each Access Point can cover about 100 m radius.
  • A brief History The first wireless LANs came into being in 1994 but it was very expensive and this blocked its development. In 1997 IEEE (the Institute of Electrical and Electronic Engineers) worked out the 802.11 standard. However people forgot about it very soon because of low capacity. In 1999 IEEE introduced the 802.11b standard which brought higher capacities. This standards development was a milestone because the biggest world-famous producers became interested in this technology. The next step in the evolution of Wi-Fi was the 802.11a standard creation. Nevertheless it did not gain support because of high hardwares prices, incompatibility with the 802.11b standard and smaller range than the latter
  • Continue... In 2002, at trade fair "Comdex 2002", there were presented some devices which could work in the new 802.11g standard. In 2003 this standard gained approval of IEEE and appeared in most producers offers 802.11g joins the capacity which is comparable to "a" and has the range like the "b" one
  • Wi-Fi StandardsStandard 802.11b 802.11a 802.11g Range 100-150 27-75 feet 100-150 feet indoors feet indoors indoorsFrequency 2.4GHz 5GHz 2.4GHz Speed 11 Mbps 54 Mbps 54Mbps
  • Wi-Fi security 64-bit encryption - original 128-bit encryption - much secure
  • The Wi-Fi Technology Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: IEEE 802.11b IEEE 802.11a IEEE 802.11g
  • IEEE 802.11b Appear in late 1999 Operates at 2.4GHz radio spectrum 11 Mbps (theoretical speed) - within 30 m Range 4-6 Mbps (actual speed) 100 -150 feet range Most popular, Least Expensive Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.
  • IEEE 802.11a Introduced in 2001 Operates at 5 GHz (less popular) 54 Mbps (theoretical speed) 15-20 Mbps (Actual speed) 50-75 feet range More expensive Not compatible with 802.11b
  • IEEE 802.11g Introduced in 2003 Combine the feature of both standards (a,b) 100-150 feet range 54 Mbps Speed 2.4 GHz radio frequencies Compatible with ‘b’
  • Wi-Fi Network Components and Implementation One of characteristics of WiFi that made it very popular is its simplicity and the easiness to deploy a WiFi network or hot spots: High Speed Internet Gateway and Backhaul (needs considerable bandwidth for local and international access / gateway) Wireless Access Point End-User WiFi capable device such as Lap top (most of today’s lap top has this feature), desktop, PDA or WiFi mobile phone… Backhauling (Transmission)
  • WiFi Network Componentsand Implementationcont.. Simple Wi-Fi Network
  • WiFi Network Componentsand Implementation cont.. Outdoor WiFi Indoor WiFi
  • Wi-Fi Networks Types Hot Spots: This technique is used when the intended objective is only one area. Access Points have directional coverage Access Point acts as a stand alone node It requires its own connection to the Internet. Example: As seen in the picture, the WiFi here at Conference Hall is a Hot Spot application.
  • WiFi Networks Types cont.. Mesh WiFi: This type is used where continuous coverage is required. In this case Access points have circular coverage and can talk to each other. Mesh WiFi can be the solution to provide relativity big geographical areas such as university campuses, big hospitals, neighborhoods… Unlike in hot spots, only few APs (20% recommended) should have access to the Internet Gateway. Access Points can be installed on, existing GSM towers,city light poles, telephone poles, etc. ..
  • WiFi Applications Healthcare  Lab administration  People with disabilities  Point-of-Care testing  Homecare administration  Controlling patient data Education  More efficient learning methods  Wireless is ideal for campus-wide coverage
  • Wi-Fi Applications cont.. Retail  Direct inventory management  Mobile POS  Self-checkout  Mobile scanners Manufacturing  Field based data collections  Product management  Inventory visibility and planning
  • Wi-Fi Applications cont.. Monitoring Ethernet devices (weather stations, sewage plants, pumping stations, hydro stations, etc.) Meters Readings (Electricity, Water…) Ideal for last few miles or last mile wireless solutions where it is not financially viable to run cable Perfect for connecting branch offices or warehouse and manufacturing facilities in urban, sub-urban, or rural communities Provide wireless access to conference and room facilities at hotels, golf clubs, resorts, and casinos
  • Wi-Fi Applications cont.. Deliver wireless to marinas, campgrounds, truck stops, special events and parks Connect apartment buildings, condos, and housing developments Allows rapid deployment of wireless networks in the following scenarios:  Video conferencing  Audio/Video Surveillance
  • Wi-Fi SiteTo implement a WiFi site you need to perform:  Radio Design: select a place for best coverage  Negotiate the owner of the selected site  Construction work and Rooftop study  Obtain power  Design site transmission  IT config. & connection  Radio site optimizationThis process take about 4-5 months
  • How a Wi-Fi Network Works• Basic concept is same as Walkie talkies.• A Wi-Fi hotspot is created by installing an access point to an internet connection.• An access point acts as a base station.• When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.• A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.• Many access points can be connected to each other via Ethernet cables to create a single large network.
  • Wi-Fi Network Topologies• AP-based topology (Infrastructure Mode)• Peer-to-peer topology (Ad-hoc Mode)• Point-to-multipoint bridge topology
  • AP-based topology• The client communicate through Access Point.• BSA-RF coverage provided by an AP.• ESA-It consists of 2 or more BSA.• ESA cell includes 10-15% overlap to allow roaming.
  • Peer-to-peer topology• AP is not required.• Client devices within a cell can communicate directly with each other.• It is useful for setting up of a wireless network quickly and easily.
  • Point-to-multipoint bridge topology This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart. These conditions receive a clear line of sight between buildings. The line-of-sight range varies based on the type of wireless bridge and antenna used as well as the environmental conditions.
  • Advantages• Mobility• Ease of Installation• Flexibility• Cost• Reliability• Security• Use unlicensed part of the radio spectrum• Roaming• Speed
  • Limitations• Interference• Degradation in performance• High power consumption• Limited range
  • WIMAX WIMAX stands for Worldwide Interoperability for Microwave Access WiMAX refers to broadband wireless networks that are based on the IEEE 802.16 standard, which ensures compatibility and interoperability between broadband wireless access equipment WiMAX, which will have a range of up to 31 miles, is primarily aimed at making broadband network access widely available without the expense of stringing wires (as in cable-access broadband) or the distance limitations of Digital Subscriber Line.
  • A WIMAX system consists of1) A WiMAX tower, similar in concept to a cell-phone tower - A single WiMAX tower can provide coverage to a very large area as big as 3,000 square miles (~8,000 square km).2) A WiMAX receiver - The receiver and antenna could be a small box or Personal Computer Memory card, or they could be built into a laptop the way WiFi access is today WIMAX TOWER WIMAX RECEIVER
  • WIMAX Specifications 802.16a Uses the licensed frequencies from 2 to 11 GHz Supports Mesh network 802.16b Increase spectrum to 5 and 6 GHz Provides QoS( for real time voice and video service) 802.16c Represents a 10 to 66GHz 802.16e Addresses on Mobile Enable high-speed signal handoffs necessary for communications with users moving at vehicular speeds
  • How WIMAX works? A WIMAX tower station can connect directly to the internet using a high- bandwidth, wired connection. It can also connect to another WIMAX tower using a line-of-sight, microwave link. This connection to a second tower, along with the ability of a single tower to cover up to 3,000 square miles, is what allows WIMAX to provide coverage to remote rural areas.
  • FEATURES OF WIMAX Scalability Quality of Service Range Coverage
  • BENEFITS OF WIMAX Speed  Faster than broadband service Wireless  Not having to lay cables reduces cost  Easier to extend to suburban and rural areas Broad Coverage  Much wider coverage than WiFi hotspots
  • Benefits to Customers Range of technology and service level choices from both fixed and wireless broadband operators DSL-like services at DSL prices but with portability Rapidly declining fixed broadband prices No more DSL “installation” fees from incumbent
  • DisadvantagesLack of QualityWimax rangeWimax BandwidthExpensive networkBad WeatherWireless equipmentsPower consuming
  • WiMAX Compared with Wi-Fi WiMAX uses 802.16 standards providedifferent types of access, from portable (similarto a cordless phone) to fixed (an alternative towired access, where the end users wirelesstermination point is fixed in location.) Wi-Fi uses unlicensed spectrum to provideaccess to a network. WiMAX and Wi-Fi have quite different Qualityof Service (QoS) mechanisms.
  • WiMAX Compared with Wi-Fi conti…
  • Network scale
  • Thank You!!!