wi-fi technology final ppt
Post on 16-Jan-2017
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Communicate broader with BSNL broaderSayani
Sarkar.Rumpa Mallick.Ankita Kundu.Rajen Kr. Maji.
Introduction to ADSL
Enables high speed data transfer in same Cu telephone lines.
Utilizes the frequencies that is not used by telephones calls.
A splitter allows single telephone lines to be used for both.
At exchange line terminates at DSLAM.
Strength vs Weakness
STRENGTH
Inexpensive Widely available. High speed
downloads and surf. Always connected,
do not monopolize phone lines.
Multiple user access without degradation.
WEAKNESS
Not available everywhere, say above 5.5 km from exchange.
Speed is affected as distance increases.
Web conferencing, web hosting, VoIP services are not well suited to ADSL.
ADSL capacities & Alternatives
The "upstream" and "downstream" pipelines have different capacities.
ADSL broadband can transfer data at rates of 1.5 to 9 Mbps when receiving data.
The ability of ADSL to send data, is limited to between 16 to 640 Kbps.
Alternatives for ADSL are IDSL,SDSL,VDSL.
ADSL UPSTREAM ADSL DOWNSTREAM
Minimum 16,000 bits/sec 1,500,000 bits/sec
Maximum 640,000 bits/sec 9,000,000 bits/sec
Virtual LANVLAN viewed as a group of devices on different physical LAN.There are three basic VLAN memberships for determining and controlling how a packet gets assigned: Port-based VLANs MAC address based Protocol based VLANs VLAN types : Single Switch VLAN Multi Switch VLAN
boundaries
End to end
VLANLocal VAN
Types of VLAN Single Switch VLAN : There are
different types of Single-Switch VLAN: Layer 1 Layer 2 Layer 3 Layer 4
Multi Switch VLAN : When it operates on multi switches.
Advantages :Increased performanceImproved manageabilityPhysical independenceIncreased Security Option
Disadvantages :Costly –
• Software based • Human labor to program• Depending on variety switches
Management complexity
Wi-Fi Technology Wireless Technology is an alternative to
Wired Technology, which is commonly used, for connecting devices in wireless mode.
Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLANs).
Wi-Fi Network connect computers to each other, to the internet and to the wired network.
Wi-Fi Network Topologies AP based topology Peer-to-peer topology Point-to-multipoint bridge topology
Basic Wi-Fi Security Techniques WEP (Wired Equivalent Privacy) : The
Original encryption technique specified by the IEEE 802.11 standard.
WPA (Wireless Protected Access) : A new standard that provides improved encryption security over WEP.
WPA2 : is an improved version of WPA that uses Advanced Encryption Standard(AES) technology.
Wireless System3G services include: Global roaming Superior voice quality and video
conference e-mail, personal organizer Information for web surfing,
music, news, corporate intranet, transportation
Purchasing-on-line shopping/banking, ticketing, gambling
Wireless System4G is a conceptual
framework and a discussion point to address future needs of a high speed wireless network
Expected to emerged around 2010-2015
4G will bring almost perfect real world wireless or called “WWWW : World Wide Wireless Web.
Advantages of 4G over 3G
3G Data transfer rate:
3.1MB/sec Internet services:
Broadband Mobile TV resolution: LOW Transmission speed:
SLOW Its predecessors are
advanced multimedia access,& global roaming facilities.
4G Data transfer rate:
100MB/sec Internet services: Ultra
Broadband Mobile TV resolution:
HIGH Transmission speed:
FAST It gives expected secure
Internet protocol based solutions.
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