.
, . , , .
:
1. , .
2. , , .
3. , . : , - , , .
4. , , , , . .
5. , .
, , . , , (sender) (receiver) , , (, , , ) , . , ().
.
() - , .
(SSB )
()
(QAM)
, ω, φ, . . Ψ(t) = ωt + φ .
() - , .
()
() , .
|
|
- (), Signal Code Modulation (SCM)
- (∑Δ)
.
(communications channels) , . : , , , - , . . , ( /).
.
.
. . , . . .
. , ( )
, . . (shielded twisted pair, STP) (unshielded twisted pair, UTP). , , ( ), .
. . , , . .
- . , . , .
. .
, , . . , , . 8 10 , 50 .
|
|
100 / 2/, . . , . , . .
- .
.
:
. , , . , .
. 4 20 . 50 /.
, , . , , . . , .
36 .. 24 , . 3-4 . : ; , , , 2 .
1,5 .., 1-2 . . , .. , , .
. . .
, , , , .