voŠ and spŠe pilsen from czech republic
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VOŠ and SPŠE Pilsen from Czech Republic. Presentation In conjuction with Comenius Project. Libor Veselý, Jan Vopátka, Jan Fajfrlík - Students Karel Hajžman and Jaroslava Skalová - Teachers. What is Wi Fi?. What I need to build a LAN ?. - PowerPoint PPT PresentationTRANSCRIPT
VOŠ and SPŠE Pilsen from Czech RepublicVOŠ and SPŠE Pilsen from Czech Republic
PresentationIn conjuction with Comenius Project
Libor Veselý, Jan Vopátka, Jan Fajfrlík - Students Karel Hajžman and Jaroslava Skalová - Teachers
What is Wi Fi?What is Wi Fi?
What I need to build a What I need to build a LAN ?LAN ?
Router - acces point - 54 Mb/s
- net cable connection - cost around 75 Euro
Wirelles CardWirelles Card
AntennaAntenna Frequency range
2.412 GHz Size 60 by 52
centimetres Contact except for 3
to 5 kilometers
Safety FuseSafety Fuse For cover home net Connecting by branch
connector Cost around 40 Euro
What Is Software of Wi-Fi ? How it everything works ??
Wi-Fi Standarts
OFDM - Orthogonal Frequency Division
Multiplexing
A large number of closely-spaced orthogonal sub-carriers are used to carry data.
Data are divided into several parallel data streams.
MIMO - multiple-input and multiple-output
Is the use of multiple antennas at both the transmitter and receiver to improve communication performance.
It is one of several forms of smart antenna technology.
Security
Types of network security:
VPN
WEP
WPA
SSID
VPN - virtual private network
Is a computer
network, where data
are carried by virtual
circuits in some larger
network - Internet,
Wi-fi...
WEP - Wired Equivalent Privacy
Is basic Wi-Fi security and
it is implemented since
1999.
It sends encrypting key
with data, so it is not too
difficult to catch its key.
We know a lot of weakness
of WEP secure.
Nowadays is recommended
to use stronger methods of
security
WPA - Wi-Fi Protected Access
protocol was created in response to serious weaknesses
in the previous system - WEP.
SSID - Service Set Identifier Is a name used to
identify WLANs to which a user wants to attach.
It is normal for multiple access points to share the same SSID if they provide access to the same network.
Turning off the broadcast of the SSID leads to a false sense of security.
My Opinion
It is cheap and fast
It is easy to use
It has high level of security
I think, Wi-Fi can be very useful in The smart home.
Chance to control smart home at a distance
1. Access to smart home2. Check home and forgotten action3. Home security4. Control setting5. Control simulated presence
1. Access to smart home
– 1 control block – gateway
– CPU or computer with Wi-Fi – access from all the world
via satellite phone via mobile phone as
SMS via internet
1. Access to smart home
2. Check home and forgotten action
- accept information about outdoor and indoor temperature and outdoor weather
- information about switch-on cooker, which we can turn off
- forgotten hotplate and turn off socket- turn off the lightning- turn off the heating
3. Home security
- accept status about security system- check with portable web camera- setting the alarm
4. Control setting
- setting the heating and air-conditioner to definite temperature
- open the dormer when outdoor weather is great and close it, whet started to rain
- control washer and setting washing mode- fill swimming pool- control gate and garage system
5. Control simulated presence
- accidental or cyclical turn on or turn off lightning- let down or let up blinds