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3

.

.

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.

.

http://www.google.com/url?q=http://www.entelia.gr/en/node/88&sa=U&ei=AwU5U8bOF8a_ygPJhoGoAg&ved=0CFAQ9QEwEQ&usg=AFQjCNHzLo2lSzf2Is0-fJYxxc3HimxjOwhttp://www.google.com/url?q=http://www.seile.gr/proionta-kalodia-seile.html&sa=U&ei=vAQ5U4OUJoTQygOcroHoCw&ved=0CDQQ9QEwAzgo&usg=AFQjCNH5kL-5Mh-q4DmUSC3AzZmrWQfqtwhttp://www.google.com/url?q=http://www.satspot.gr/technology/connections/255----utp&sa=U&ei=bgQ5U8rvE9P2yAOqwIHQDA&ved=0CFIQ9QEwEg&usg=AFQjCNEFE-HnxgsVxBH8Vafm6HDmfHU5UQ

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(Twisted Pair)

(UTP)

(STP)

(Coaxial cable)

(Base band coaxial cable)

(Broad Band coaxial cable)

(Fiber optic)

(Single mode fiber optic)

(Multi mode fober optic)

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UTP & STP

UTP ( ):

. 5 .

STP ( ):

.

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(Coaxial cable)

1. UTP.

2. STP,

.

3.

.

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(fiber Optic)

1. .

2. ( 5 Gbps).

3. .

4. .

5. ( ) .

6. , .

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(radio waves)

1. . 1 m 100 Km. .

2.

, , .

3. , ,

( VHF

, (Very HighFrequency)

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(micro waves)

, , , .

,

.

, ,

.

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(satellite communication)

(satellites)

, ,

.

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4

1.

2.

3. 4.

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1.

.

, .

, , .

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2

,

.

,

,

,

.

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3

,

,

,

.

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4

.

,

. . .

, , .