datacomm slides
TRANSCRIPT
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Professor Tarek Saadawi
Rm 529
X7263Office Hours: Thursday 12 1:3!
"#so ra$dom i$ Tuesday
%oca# a$d &e'ro(#i'a$ "rea
)e'works
*+,7!!!-
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Input Transmitter channelOutput
DeviceReceiver
.*'- r(t) ~I(t)+*'-
Code [ A 1 0 0 0 0 0 1 ]
ncode!odulation" ampli#ication" $iterin%
$i% 1 &asic !odel $or a Communication 'stem
+ *'- Analo%
Di%ital
X *'- Analo%
Di%ital
Introduction to Digital/Data Communications Systems
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&S'(C)R*(*+S S'(C)R*(*+S 2$ m& curre"t loo, S'(C
/& RS 202C )D1C
Serial /& RS-223 203 44 SD( 1&P-d /& RS 5 /// 5$2 sta"dards
7
Parallel /// S!D 55 8 %495 :icro,rocessor
"terfaces
7
Figure 2.9 Typical data transfer interfaces
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ncoder Decoder
it stream to be
tra"smitted b;t<tra"smitted sig"al
d;t<
tra"smissio" li"k
!odulator Demodulator
it stream to betra"smitted b;t<
tra"smitted sig"al
a;t<
tra"smissio" li"k
Figure 2.%% bits are modulated into analog signaling
b;t<
b;t<
Figure 2.%$ bits are encoded digital signaling
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Bit stream to
be transmitted
% $ $ % % $ %
=v
-v
-v
=v
$
$
-v
R
!R
!R"
#anc$ester
%eads 'o ou' of
sy$ch/ 0 o#'ae/
0iffere$'ia# e$codi$4
com(ari$ 'he (o#ari'y of
adace$' i's/ more re#ia#e
'o de'ec' a 'ra$si'io$ 'ha$
'o com(are a 'hresho#d
Se#f,c#ocki$/ 2 symo#s (er
i' *aud-/ 1! &(s mea$s 2!
&auds/ 85!
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*
*
*
Differential
#anc$ester
%lternating #ar&
In'ersion
Duo binary
Figure 2.%2
3,#ee#s/ i$ary ;ero
is ;ero o#'ae/
i$ary 1 a#'er$a'es
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$ % $ $ % $ % $
>
;a< &S?
&% cos;wt = @ < b;t< A %
&2 cos;wt = @ < b;t< A $
*
(
b;t<
& cos ;2Bf t =@ <
;b< FS?
;c< PS?
& cos ;2Bf % t =@
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>
(
b;t<multi,licatio"
;t<
Carrier
( ) *S+
b;t<
& cos ;wt = $ < $ $
& cos ;wt = 4$ < $ %
& cos ;wt = %5$ < % %
& cos ;wt = 2B < % $
:-ary 8 PS?
Figure 2.% Digital Sig"al :odulatio" !ech"iues
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:ary PS?
;t< A & co" ; 2Bft = E 2Bf2 : G < 3 k A $3%3HH..3 :.
: A 2 PS? : A IPS?
Anolo%
Di%ital
Anolo%
A'" '" $'" !'
(!oderns)
A!" $!" ! !odulator
(transmitter) Anolo%
Di%ital
C!" Delta !odulator
R2" 3R2" 3R21
codec" Di%ital transmitter
!y,e of sig"al
tra"smitted"formatio"
to be tra"smitted
Figure 2.%6 /am,le of "formatio" Sig"ali"g format
a"d the devices used.
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4 A & C4
56 1
57 151 050 1Input
(10011)
'hi#t Re%ister 5(8) 86 4 87 4 1 8OR
r 6 0 0 0
0 1 1
1 0 1
1 1 0'hi#t Re%ister
Content
'tep Input A & C
0 0 0 0 0
1 1 1 0 0
7 1 1 1 06 0 0 1 1
9 0 1 0 0
: 1 1 1 0
; 0 0 1 1
< 0 1 0 0
= 0 0 1 0
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