-
M ha knh
d
9/16/2013 - 1
-
9/16/2013 - 2
-
(coding schemes)
Baudot (Emile Baudot)5 bit (32 m)
M EBCDIC (Extended Binary Coded Decimal Interchange Code)8
bit
M ASCII (American Standards Committee for Information
Interchange)
Unicode
9/16/2013 - 3
-
M 8 bit EBCDIC
9/16/2013 - 4
-
M ASCII 7 bit
8 bit
9/16/2013 - 5
-
M ASCII
9/16/2013 - 6
-
- point).
- Multidrop).
Sao (Star).
Vng (Ring).
9/16/2013 - 7
-
9/16/2013 - 8
-
Bn song cng (half-duplex
9/16/2013 9
-
Song cng (full-duplex
(telephone).
9/16/2013 - 10
-
-9/16/2013 11
-
9/16/2013 - 12
-
9/16/2013 - 13
-
(Bn phm my tnh)
Start bit
Stop bit (bit 1).
(Asynchronous transmission)
9/16/2013 - 14
-
(Asynchronous transmission)
9/16/2013 - 15
-
Nguyn l :
)
(Asynchronous transmission)
9/16/2013 - 16
-
9/16/2013 - 17
-
Truyen bat ong bo
(Asynchronous transmission)
9/16/2013 - 18
chnh xc
-
(Asynchronous transmission)
9/16/2013 19
msb P
Start bit - 1bit. Stop bits - 1,1.5,2 bit. Data bits:
5,6,7,8.
Parity :
-
(Asynchronous transmission)
start, data, parity & stop
bits).
9/16/2013 - 20
-
(Asynchronous transmission)
:
Stuffing).
9/16/2013 - 21
-
(Asynchronous transmission)
9/16/2013 - 22
-
:V 1 k m ha m ASCII 8 bit, 1bit start v 2 bit stop
thm parity th
: k ra
1200bps. Th l
1200x0.727= 872bps
(Asynchronous transmission)
' 80.727 72.7%
' ` 8 1 2
S bt thng tin
T ng s bt truy n
9/16/2013 - 23
-
: TSLDLE
1200bps.
a.
b.
c.
khc).
(Asynchronous transmission)
9/16/2013 - 24
-
(Synchronous transmission)
khng c Start Bit v Stop bit.
9/16/2013 - 25
-
(Synchronous transmission)
9/16/2013 - 26
-
Encoder.
(Synchronous transmission)
9/16/2013 - 27
-
(Synchronous transmission)
9/16/2013 - 28
-
Digital Phase-lock-loop (DPLL):
m ho
1 0 hay 0 1).
4B3T, 2B1Q
(Synchronous transmission)
9/16/2013 - 29
-
(Synchronous transmission)
9/16/2013 - 30
-
N=32
clock.
(Synchronous transmission)
9/16/2013 - 31
-
Clock
hnh 3.3.3 d).
(Synchronous transmission)
9/16/2013 - 32
-
Truyen ong bo
(Synchronous transmission)
9/16/2013 - 33
-
9/16/2013 - 34
V tr cac
chuyen tiep
Luong bit thu
c, RxD
32 x CLK
Xung lay mau
tn hieu, RxC
32 chu ky 32 chu ky
Trng hp ly tng.
-
9/16/2013 - 35
V tr cac
chuyen tiep
Luong bit thu
c, RxD
32 x CLK
Xung lay mau
tn hieu, RxC
32 chu ky 32 chu ky
Trng hp ieu chnh pha (DPLL).
A B C D E
10 4 4 4 10
32+1 chu ky32+2 chu ky32-1 chu ky32-2 chu ky
-
B, C, D, E (hnh 3.3.3 d).
32 2 = 30 clock.
E, th
32+2 =34 clock.
(Synchronous transmission)
9/16/2013 - 36
-
-
).
(Synchronous transmission)
9/16/2013 - 37
-
2
(Synchronous transmission)
9/16/2013 - 38
-
Hybrid.
(Synchronous transmission)
9/16/2013 - 39
-
9/16/2013 - 40
-
(Synchronous transmission)
Character-
(control characters)
SYN
9/16/2013 - 41
-
(SYN)
(Synchronous transmission)
9/16/2013 - 42
-
Truyen ong bo
(Synchronous transmission)
9/16/2013 - 43
