A comparison of wi-fi and wimax with case studies - Florida State ...
A comparison of wi-fi and wimax with case studies - Florida State ...
A comparison of wi-fi and wimax with case studies - Florida State ...
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dif<strong>fi</strong>cultt<br />
to be hhacked;<br />
theerefore,<br />
it is populaar<br />
for somme<br />
industriies.<br />
To immprove<br />
thee<br />
competitiveness<br />
<strong>of</strong>f<br />
802.11a, rresearchers<br />
invent a tripple<br />
frequenncies<br />
chip foor<br />
a/b/g. Someone<br />
whoo<br />
works iin<br />
the <strong>of</strong><strong>fi</strong>cee<br />
<strong>wi</strong>th 802.111a<br />
can then n walk out to a public place <strong>and</strong> gget<br />
on the Innternet<br />
<strong>wi</strong>thh<br />
802.11bb/g.<br />
The neew<br />
productss<br />
make cerrtain<br />
that thhese<br />
three sst<strong>and</strong>ards<br />
caan<br />
be opera ated in onee<br />
buildingg.<br />
[7] – [9] [14]<br />
3.3. TThe<br />
Physiccal<br />
Layerr<br />
<strong>and</strong> MA AC Layer<br />
3.3.1. The Phyysical<br />
Layyer<br />
3.3.1.11.<br />
Introduuction<br />
The e Physical llayer<br />
is the <strong>fi</strong>rst layer o<strong>of</strong><br />
the OSI ( (Open Systeem<br />
Interconnnection)<br />
mmodel,<br />
<strong>fi</strong>guree<br />
3-1. It is at the boottom<br />
<strong>of</strong> thhe<br />
model. TThis<br />
layer iis<br />
responsibble<br />
for deciding<br />
the tr ransmissionn<br />
methodd,<br />
b<strong>and</strong><strong>wi</strong>dthh,<br />
mediums,<br />
bit synchronization,<br />
mmodulation<br />
<strong>and</strong> so on. MMost<br />
physic cal set up iss<br />
completted<br />
in this layer. It is the <strong>fi</strong>rst layer<br />
<strong>of</strong> the nnetwork<br />
strructure.<br />
It pprovides<br />
a mechanical m ,<br />
electrical<br />
<strong>and</strong> alsoo<br />
proceduraal<br />
flattop be etween the transmissioon<br />
mediumm.<br />
The mosst<br />
importantt<br />
missionn<br />
<strong>of</strong> the phyysical<br />
layerr<br />
is the flueency<br />
<strong>of</strong> dataa<br />
streams. TThis<br />
sectionn<br />
is going to t introducee<br />
several technologiees<br />
used for 802.11 prottocols<br />
<strong>and</strong> w<strong>wi</strong>ll<br />
discuss how they wwork<br />
in this layer.<br />
FFigure<br />
3-1 OOSI<br />
Model<br />
14
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