Ly Thuyet Thong Tin
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KHI NHC TI MANCHESTER, MI NGI NGH
Company LogoCn chng ti ngh
M Manchester Vi Phn Nhm 12 L Thanh Bnh Trn Th T Oanh Nguyn Th HngTrn Huy Hong nh TGV Hng Dn: Th.s V Ngc Chm
(DIFFERENTIAL MANCHESTER ENCODING)LOGOCompany LogoMc LcM ng Truyn1M Manchester Vi Phn2Bi Tp ng Dng3Tng Kt4Lp MGii Mu, nhc im
Company LogoM NG TRUYNL qu trnh chuyn i hay nh x chui s liu nh phn thnh tn hiu s (dng sng truyn dn)
V d: Bit 0 c chuyn thnh xung vung c bin +ABit 1 c chuyn thnh xung vung c bin -A
Company LogoM NG TRUYNTn hiu PCM l chui cc bit 1 v 0.M ng truyn
C th chuyn t mt dng m ny sang dng m khc trong thit b truyn PCM. Truyn tn hiu t mt b ghp knh n b cp thp hn d c ly ngn cng c th b sai nu truyn khng ng dng
Company LogoM NG TRUYNL mt lc s truyn d liu tng tPCM(iu ch m xung)
Company LogoM NG TRUYN
H1
Company LogoM NG TRUYNTo kh nng tch tn hiu ng b b thu
To dng ph ca tn hiu s sao cho ph hp vi knh truyn hn. MC CH CA M
Company LogoM ng truyn
H2. Khng ng b my thu v pht
ng h ni nhn v ni pht phi ging nhau th mi c th tch c thng tin mt cch chnh xc.m bo c iu ny th c gi l ng b.
Company LogoTn hiu nh thi ng b my pht v my thuLu Lu khi chn m ng truynLU
Bng thngGim st c cht lngThnh phn DC (1 chiu)
Company LogoLu
H3. C dng DC v khng c dng DC
Company LogoYu cuYU CUNng lng tn s thp phi nhKhng c thnh phn 1 chiu (DC)C nhiu cnh xung: khi phc xung clock b thuTn hiu m ha phi c kh nng gii m duy nht thnh tn hiu gcBin i c quy lut sao cho my thu kim sot c li bitDi tn hp
Company LogoPhn loiNRZINRZ-L Pseudoternarya cc AMIHDB3B8ZS Manchester vi phnManchesterPhn L01(Theo phng thc m ha)NRZNh Phn a McK thut xo trnHai pha
Company LogoM MANCHESTER VI PHN DIFFERENTIALMANCHESTERENCODING
Company LogoNgun gcTitleManchester vi phn (v c M Manchester) c t tn theo trng i hc Manchester ni u tin ghi nhn vic s dng n vo cui nhng nm 1940. Ngi u tin ln k hoch v pht trin n l Tin s G. E Thomas ca i hc Manchester.
G. E Thomas
Company Logoc imL m biphase nh du ( 2 pha) hay m o pha.
L 1 m ng truyn.
D liu v tn hiu xung c kt hp to thnh 1 dng d liu t ng b ha 2 lp thng nht.
thi im gia ca mi bit lun c s thay i ca mc xung.
L m vi phn, bng cch s dng s c mt hay vng mt ca s chuyn tip cho bit gi tr logic.
Khng quan trng gi tr logic 1 hay 0 c nhn m ch xem phn cc l nh nhau hoc khc nhau t gi tr trc (ng b ha d hn).
D liu v tn hiu xung c kt hp to thnh 1 dng d liu t ng b ha 2 lp thng nht.L m biphase nh du ( 2 pha) hay m o pha. L 1 m ng truyn. thi im gia ca mi bit lun c s thay i ca mc xung.L m vi phn, bng cch s dng s c mt hay vng mt ca s chuyn tip cho bit gi tr logic. Khng quan trng gi tr logic 1 hay 0 c nhn m ch xem phn cc l nh nhau hoc khc nhau t gi tr trc (ng b ha d hn).
Company Logoc imM Difference Manchester l mt loi m c c cc li ch ca m theo kiu so snh s khc bit (differential code).
Tm li
Company Logoc imVD: Ta c dy bit : 10011101 s c biu din nh sau:
V ngc li, khi cho dng biu din th ta cng gii m c ngc li dy bit.
Th ta c
Company LogoTc Tc truyn d liu (Bit/s)Tc iu ch(Baud)Tc truyn d liu (hay tc truyn bit) l 1/tB vi tB l khong thi gian mt bit. Tc iu ch l tc pht sinh tn hiu.Vi m ho Manchester. B rng ti thiu ca mt thnh phn tn hiu l mt xung c rng bng khong thi gian 1 bit. Vi mt chui lin tip cc bit 1 hoc cc bit 0. Phi sinh ra mt dng lin tip cc xung nh vy. Tc iu ch ti a ca m Manchester l 2/tB.
VY SAO??!
u, nhc im
ng DngCompany LogoM Manchester vi phn c s dng trong chun IEEE 802.5 cho mng LAN Token-ring s dng cp i xon c bo v.
TNG KTCompany LogoManchester Vi phn l 1 trong nhng loi m ng c cch biu din chui bit vi nguyn tc:
1: khi c s chuyn i u khong bit0: khi khng c s chuyn i u khong bit
ng dng ca n trong thc t trong mng Lan Token ring.
Bi tpCompany LogoV d 1: Chui bit cho trc : 1111001011010010
V d 2: Tm chui bit
Bi tpCompany LogoGii:Vd1:
Vd2:
Ti liu tham khoCompany LogoTrong bi bo co s dng nhng ti liu tham kho sau:Manchester encoding: opposing definitions resolved ca Roger ForsterManchester and Differential Manchester Code ca Giorgos LazaridisGio trnh k thut truyn tin ca Nitro Pdf professtionalTruyn d liu ca Nguyn Trung Lp
V rt nhiu ngun ti liu khc nhau ti website: tailieu.vn, ebook.edu.vn, google.com, .v.v
Thank You !
The EnDLOGO