. . .
OSI, .
, , , .
- , .
, , , , , , .
(twisted pair). (Shielded Twistedpair, STP), , (Unshielded Twistedpair, UTP), . , .
(coaxial) , . , - , , . .
1 , 2 ( ), 3 , 4 ( )
. . . .
OSI, .
, , , . - , .
(twisted pair). (Shielded Twistedpair, STP) . , .
, . , ( , ).
- () - , - , , . , , .
(Single Mode Fiber, SMF) , - 5 10 . , . - .
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(Multi Mode Fiber, MMF) , . 62,5 50 . , . . .
- 500 800 /. - , - .
- , - .