mang tich hop da dich vu x-isdn
TRANSCRIPT
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H THNG VIN THNG VI CNG NGHMI
CHNG 3 :
MNG TCH HP SA DCH V BNGRNG B-ISDN
INH TH THI MAIReference: Broadband Communications Technology
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CHNG 3: MNG TCH HP SA DCH VBNG RNG B-ISDN
CHNG 3: MNG TCH HP SA DCH VBNG RNG B-ISDN
PHN 1: GII THIU TNG QUAN VB-ISDN V ATM
PHN 2 : M HNH THAM CHIU GIAOTHC MNG B-ISDN
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PHN 1: GII THIU TNG QUAN V B-ISDN V ATMPHN 1: GII THIU TNG QUAN V B-ISDN V ATM
1.1 Khi qut v B-ISDN1.2 Kin trc mng B-ISDN
1.3 Cng ngh ATM v cc c trngcbn
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PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISDN
2.2 Lp vt l ca B-ISDN
2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
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PHN 1: GII THIU TNG QUAN V B-ISDN VATM
PHN 1: GII THIU TNG QUAN V B-ISDN VATM
1.1 Khi qut v B-ISDN
1.2 Kin trc mng B-ISDN
1.3 Cng ngh ATM v cc c trng
cbn
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
Mng bng rng
- Mng bng rng lmng cung cp cccdchv tho mn nhu cu ca khch hng. l mng ckh nng truyn ti nhiu loi hnh dch v, t cc
dch v vin thng truyn thng nh in thoi, fax n cc loi hnh dch v cao cp hn nh truynhnh s, HDTV, in thoi Video, truyn d liu tc
cao, VOD, Multimedia, Internet, Telephony
-Ccdch vbng rng c thc hin trn cs
cc cng ngh Frame Relay, SMDS (SwitchedMultimegabit Data Service) v cng ngh ATM
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
Cc loi dch v (theo tiu chun ca CCITT )
- Bng hp ( Narrowband ): cc dch v c tc 64 Kbps.- Bng trung ( Wideband ): cc dch v c tc 64Kbps n 1.5 Mbps ( T1, E1 ).- Bng rng ( Broadband ): > 1.5 Mbps ( T1, E1 ).Trong dch v thuc nhm 1 v 2 l N ISDN.Dch v thuc nhm 3 l B ISDN.
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
nh ngha B-ISDN
- B-ISDN l mt dch v yu cu knh truyn dnc kh nng h trtc ln hn tc cbn
- iu c ngha l B - ISDN s dng bngthng rt ln p ng cc yu cu ng dng vdch v cao cp. y, chng ta s cp ti cc
kha cnh k thut v cng ngh B-ISDN v ATM
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
ng lc pht trin B-ISDN
ng lc caB-ISDN
Cng ngh ng dng
Doanh nghipTiu chun
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
ng lc pht trin B-ISDNCng ngh
Nhng cng ngh thc y B ISDN pht trinmnh m gm:
- Cng nghbn dn vi mch v quang t
- Cng ngh quang si
- Cng ngh Vi x l v my tnh s
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
ng lc pht trin B-ISDNng dng
Nhu cu ng dng cc dch v B-ISDN vo cucsng v cc hot ng ca khch hng l mt trongnhng ngun ng lc quan trng.
- Lin k t mng LAN
- X l nh/Video
- nh ho
- Siu my tnh
- Multimedia
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
ng lc pht trin B-ISDNDoanh nghip
- Vi nn kinh t ton cu ho hin nay, cc tp onv cng ty mnh pht trin trn th trng, h lun
n lc tm kim th trng mi v iu khin i tcvi y u cu cung cp dch v mi cht lng cao =>Kch thch, thc y vic to r a c c lnh vc cngnghip mi.
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
ng lc pht trin B-ISDNTiu chun ho
- Tiu chun ho c vai tr r t quan trng m bothnh cng cho cng ngh.
- To ra cc giao thc, cc ch tiu k thut sao chobt k nh u t no cng c thpht trin snphm s dng c trong mt mng ton cu thng
nht.
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1.1 Khi qut v B-ISDN1.1 Khi qut v B-ISDN
Nn tng ca B-ISDN
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PHN 1: GII THIU TNG QUAN V B-ISDN VATM
PHN 1: GII THIU TNG QUAN V B-ISDN VATM
1.1 Khi qut v B-ISDN
1.2 Kin trc mng B-ISDN
1.3 Cng ngh ATM v cc c trng
cbn
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDN
Hnh: Cu trc quan im ca B - ISDN
ATM(XC)
ATM(SW)
ATM(SW)
BISDN - NT BISDN - NT
BISDN-TE BISDN-TE PBX LAN/MAN
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDN
Hnh: Cu hnh chun ca B - ISDN
B-NT1ATMSW
LAN/MAN
IWU
ATMSW
ATMSW
B-NT1 PBX
PSTN
PSDN
B-NT2B-TE1
B-TAB-TE2
Pha mng
NNI
UNI(Un)
UNI(Un)
TbSb
R
Pha ngi dng
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDNCu hnh chun ca B ISDN pha UNI
Cc khi chc nng
- NT1 kt cui mng loi 1 thc hin chc nng lp 1ca m hnh OSI. Chc nng ca NT1 bao gm truyndn trn ng dy tn hiu s, cp ngun DC, nh thi
v ngoi ra NT1 cng thc hin chc nng bo dng sb.- NT2 l k t cui mng loi 2, NT2 l kt cui mng
thng minh ( v d nh PABX ) tng ng vi mc 1 vmc mng cao hn ca m hnh OSI. N thc hin chcnng thch ng mi trng ghp knh, tp trung lulng. Trn thc tNT1 vNT2 c th kt hp vo mtthit b chung ch c mt trong hai kiu tu thuc vothuc tnh thu bao c th.
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDNCu hnh chun ca B ISDN pha UNI
Cc khi chc nng
- TE1: Thit b u cui loi 1 thc hin chc nngtng tc vi lp 1 v lp cao hn, chc nng ca TE1
bao gm cc giao din user to user, user to machine v
cc giao thc qun l bo hiu, qun l OA& M v iukhin trao i thng tin cho user. TE1 x l v thc hincc chc nng c chun h o bi giao din chun cho
mng B-ISDN theo khuyn ngh ca CCITT.- TE2: Thit bu cui loi 2. Chc nng tng ngnh TE1 ch c iu khc l khng tun theo giao dinchun ca CCITT.- TA: B thch ng u cui ( Terminal Adapter ) c vaitr thch ng cho TE2 vi mng B - ISDN.
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDNCu hnh chun ca B ISDN pha UNI
Cc im chun
- Cc im chun Sb v Tb cung cp phng tintin ch xc nh cc thuc tnh vt l in kh dctheo tuyn truyn tin. C th l giao din lp vt l
ti cc im chun ny c th chn hay l cho ccphng thc truyn tin theo SDH-Based hoc Cell-based.- im chun Tb - giao din n dng cho B -
NT1 v mi trng vt l phc v cho kiu kt niim - im.
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1.2 Kin trc mng B-ISDN1.2 Kin trc mng B-ISDNCu hnh chun ca B ISDN pha UNI
Cc im chun
- im chun Sb: c th c nhiu giao din dngcho B-NT2 v n cung cp kiu kt ni im - ti
im lp vt l v k t ni im - a im lpcao hn- im chun R: nh ngha giao din kt ni TE2
vi mng thc hin nhim v thch hp tc btcho TE2 c th
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PHN 1: GII THIU TNG QUAN V B-ISDN VATM
PHN 1: GII THIU TNG QUAN V B-ISDN VATM
1.1 Khi qut v B-ISDN
1.2 Kin trc mng B-ISDN
1.3 Cng ngh ATM v cc c trng
cbn
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1.3 Cng ngh ATM v cc c trng c bn1.3 Cng ngh ATM v cc c trng c bn
Cng ngh ATM v ng dng trong B-ISDN
Tbo ATM
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Cng ngh ATM v ng dngtrong B-ISDN
Cng ngh ATM v ng dngtrong B-ISDN
ATM : Asynchronous Transfer Mode Phngphp truyn dn khng ng b (ghp knh v
chuyn mch) ATM : l mt kiu chuyn mch gi vi cc gi
c kch thc c nh (53 byte) hay cn gi l tbo (tbo ATM)
Phng thc: Hng kt ni (connection
oriented) S dng ghp knh khng ng b (thng k) gi
l ATDM (Asynchronous Time DivisionMultiplexing)
C h ATM dC h ATM d
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Cng ngh ATM v ng dngtrong B-ISDN
Cng ngh ATM v ng dngtrong B-ISDN
Ghp knh ATDM v TDM
TDM
.A .B.C
1 2 3
1 2 3
ATDM
A
BC
1 2 3
1 2 3
C h ATM dC h ATM d
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Cng ngh ATM v ng dngtrong B-ISDN
Cng ngh ATM v ng dngtrong B-ISDN
Ghp knh TDM
- Nguyn l: gn knh c nh cho cc khe thigian m khng quan tm n c thng tin hay khng
- Nhc im: Lng ph ti nguyn ng truyn
Tc khng thay i
C h ATM dC h ATM d
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Cng ngh ATM v ng dngtrong B-ISDN
Cng ngh ATM v ng dngtrong B-ISDN
Ghp knh ATDM
- Nguyn l: Lu tr cc tn hiu tc thp vomt b m, sau khi phc li v chn cc tnhiu c lu tr vo cc khe thi gian theo nguyn
l lp lch u tin (V d: FIFO). y, cc tn hiuvo l cc tbo ATM
- u im:
Tit kim ti nguyn
Tc ca cc knh l khc nhau v c th thay
i
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ng ng v ng ngtrong B-ISDN
ng ng v ng ngtrong B-ISDN
Cng ngh ATM - Sla chn cho B-ISDN
K thut hin thi.
Yu cu i vi B -ISDN
CM knh CM gi Truyn dnSTM
Giao din UNI tc cao Tt Km Tt
Cc dch v VBRv UBR
Km Tt Km
Hiu qu sdngti nguyn Km Tt Km
Nhu cu mi spht sinh trong
tng lai
? ? ?
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ng ng v ng ngtrong B-ISDN
ng ng v ng ngtrong B-ISDN
Cng ngh ATM - Sla chn cho B-ISDNATM & B - ISDN.
Kin trc mng ng nht.Tc bt thay i ( bng rng v VBR ).Hiu sut s dng ti nguyn cao.
Gi thnh r v bo v u t.
Dch v a phng tin ( Multimedia Services ).
Yu cu ca khch hng Cng ngh
Lu lng kiu dng v t binCht lng truyn dn v QOScao
Dch vphong ph
Gi thnh r, tin s dng.Ton cu ho.
1. IC LSI &VLSI.2. X l s ( SPC v mytnh )
3. Cp si quang.
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ng ng v ng ngtrong B-ISDN
ng ng v ng ngtrong B-ISDN
Cng ngh ATM - Sla chn cho B-ISDN
Cc tnh nng u vit ca cng ngh ATM:
Tnh linh hot: D p ng mi dch v mi trong tnglai. S dng ngun ti nguyn hiu qu cao: Phi hp mng
mi ( ATM ) vi mng c ( PDH/SDH ) tt. N l mt mng vn nng n gin ( th tc x l tbort n gin)
Gim gi thnh OA & M ( Operation Adminstration &Maintenance ). Gim gi thnh truyn dn.
m bo cp knh bng rn g v r t nng ng, mmdo. Tc truy cp mng cao.
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1.3 Cng ngh ATM v cc c trng c bn1.3 Cng ngh ATM v cc c trng c bn
Cng ngh ATM v ng dng trong B-ISDN
Tbo ATM
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T bo ATMT bo ATMCu trc t bo ATM
Header Space
User informationSpace
bit # 8 7 6 5 4 3 2 1 Octect #1234567
53
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T bo ATMT bo ATMCu trc t bo ATM
Tiu ch chn la kch thc
- Hiu qu truyn dn:
T l H/L cng nh cng tt => hiu sut truyn dncao => Gim kch thc tbo tng hiu sut
truyn dn.- tr: cc loi hnh dch v yu cu tnh thi gianthc cao. Kch thc tbo cng ln => tr cng
ln => Gim kch thc tbo gim tr truyntin
1/( ) (1 / ) L L H H L= + = +
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T bo ATMT bo ATMCu trc t bo ATM
Tiu ch chn la kch thc
- Tn tht: Gi cng ln xc sut tn tht cng caov cht lng dch v QoS cng km.
- n gin ho phn tiu => cc gi bng nhau(khng cn phn ch di gi).
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T bo ATMT bo ATM
Cu trc Header ca t bo ATM
GFC VPI
VPI VCI
VCI
VCI PT CLP
HEC HEC
CLPPTVCI
VCI
VCIVPI
VPI
Cu trc Header ti giaodin UNI
Cu trc Header ti giaodin NNI
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T bo ATMT bo ATM
Cu trc Header ca t bo ATM
- GFC (Generic Flow Control): iu khin lung- VPI (Virtual Path Indentifier): Tn ng o
- VCI (Virtual Channel Indentifier): Tn knh o- PT (Payload Type): Kiu trng tin
- CLP (Cell Loss Priority): u tin tn tht tbo
- HEC (Header Error Control): iu khin s a i li tiu
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T bo ATMT bo ATM
Cu trc Header ca t bo ATM - GFC
- Chim 4 bit- Ch c giao din UNI
- H tr iu khin lung lu lng t ngi dngvo mng
- H trchia s ti nguyn gia cc u cui ATMtrong mng khch hng
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMVPI/VCI
- i vi UNI gm 24 bit: 8 bit VPI v 16 bit VCI.- i vi NNI gm 28 bit: 12 bit VPI v 16 bit VCI.
- VCI : c s dng thit lp cc cuc ni s dng bng bin dch Node chuyn mch ATM
- VPI : thit lp ni mt ng ochomt hay nhiu
VCIs tng ng trong hng v cc c trng dch v.
- Nu chuyn mch ch da trn gi tr VPI th c gi l
kt ni ng o, nu da trn c hai gi tr VPI/ VCI thc gi l k t ni knh o.
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMVP/VC
Hnh : Khi nim v ngo v knh o trong lp vt l.
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMVP/VC
- Knh o (VC) ch tn ti vt l khi cn thit ngha lch tn ti trong thi gian thc s truyn ti tbo ATM.Knh vt l ng vai tr nh mt ng khng l chung
cho mi ngun truyn tin.- Trong tng tbo knh o c nhn dng bi gi tr VCI. Ti cc nt chuyn mch bng nh tuyn s cung
cp cc thng tin thng dch VCI cho tng t bo khic truyn ti. Thng tin cn thit ca bng ny ccp nht trong giai on thit lp cuc gi v g i nguyngi tr ny trong sut qu trnh cuc gi. Mi VCI s cmt gi tr ring v cc lin kt VCI khc nhau c gi trkhc nhau.
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMVP/VC
- ng o: l mt tp hp cc lin k t o c chungim kt cui. Chui cc lin kt o lin k t vi nhau tothnh mt kt ni ng o ( VPC ), ni gia hai im
kt ni VPC hoc xt trong cu hnh im a im c skt ni t hai trln.- ng truyn o c phn bit bi gi tr nhn dng
ng o VPI. Cc bn thng dch tuyn cc ntchuyn mch s thc hin s thng dch gi tr VPI catng t bo khi thm nhp vo cc b ni cho. Ccthng tin i vi cc knh o thuc ng o ny khng
b x l, tt c knh o thuc ng o s c truynti trn cng mt ng o.
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMTrng ti thng tin PL
- Gm 3 bt- Dng ch th thng tin c truyn ti l thng
tin khch hng hay thng tin mng, khi PT mang ccthng tin mng ( nhng c xy ra tc nghn ) mngs c x l i vi trng thng tin ca tbo.
A
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMTrng u tin tn tht t bo CLP
- Ch c mt bt.- Gi tr ca bt ny c th c xc lp bi khch
hng hoc nh cung cp dch v, dng cho mc chiu khin tc nghn.- Cc t bo c CLP=0 c mc u tin cao v
CLP=1 c mc u tin thp hn. Vi tbo c CLP=1 sb o thi nu trong mng xy r a tc nghn.
T b ATM
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T bo ATMT bo ATM
Cu trc Header ca t bo ATMTrng iu khin li tiu HEC
- Trng ny gm 8 bit, c x l lp vt l.- Dng sa cc li 1 bt hoc pht hin cc li
nhiu bt. HEC ch dng sa s a i li tiu trnhtn tht tbo c th xy ra do mt nh hng v saili.
- Xc nh bin gii tbo- M ho theo CRC
T b ATM
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T bo ATMT bo ATM
Cc loi t bo ATM
- T bo gn A (Assigned Cell): l t bo ATMmang thng tin hiu lc ca ngi s dng hoc camng- Tbo khng gn UA (Unassigned Cell): l loi t
bo c hnh thnh lp ATM nhng cha thng
tin khng c hiu lc hot cha tiu c nhngha trc. Thng dng cho cc chc nngOA&M, bo hiu v.v
AT b ATM
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T bo ATMT bo ATM
Cc loi t bo ATM
- Tbo ri I (Idle Cell): c s dng lp vt l thch ng tc t bo ATM vi tc truyndn. Cc tbo ri c a vo u ngun vt l
v trit tiu u ch.- T bo hp l V (Valid Cell): L t bo khng bli pha thu hoc c li nhng c sa
- Tbo khng hp l IV (Invalid Cell): l tbo bli, c trng hp t bo b li m vn hp l dokhng pht hin c li. Tboli b hu lp vt
l, khng a l n lp ATM
T b ATMT b ATM
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T bo ATMT bo ATM
Cc loi t bo ATM
Lp ATM
Lp vt l
T bo gn T bo gn
T bokhng gn
T bokhng gn
T bori
T bokhng hp l
T bo
ri
HuPha pht Pha thu
PHN 2 : M HNH THAM CHIU GIAO THCPHN 2 : M HNH THAM CHIU GIAO THC
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PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISDN
2.2 Lp vt l ca B-ISDN2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
2 1 i i S
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2.1 M hnh tham chiu giao thc B-ISDN2.1 M hnh tham chiu giao thc B-ISDN
Hnh: M hnh tham chiu giao thc mng B - ISDN
2 1 M h h h hi i h B ISDN
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2.1 M hnh tham chiu giao thc B-ISDN2.1 M hnh tham chiu giao thc B-ISDN
Cu trc
Gm 3 mt phng:- Mt phng ngi dng: cung cp cc chc nng chuyn tip lung thng tin ngi dng t u
cui n u cui cng nh cc chc nng iu khinlin quan v d nh: iu khin lung hay sa li.
- Mt phng iu khin: cung cp cc chc nngiu khin kt ni v k t ni cuc gi. Ngha l, mtphng ny cung cp cc chc nng lin quan n vic
thit lp, iu khin v g ii phng cuc gi.
2 1 M h h h hi i h B ISDN
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2.1 M hnh tham chiu giao thc B-ISDN2.1 M hnh tham chiu giao thc B-ISDN
Cu trc
- Mt phng qun l: cung cp cc chc nng qunl mng (OAM). Mt phng qun l c chiathnh 2 mt:
Qun l mt: thc hin vic qun l ton b mng
Qun l lp: chc nng qun l cc tham s v ti
nguyn trong mi mt thc th mng (TE, NT) vqun l l ung thng tin OAM
2 1 M h h h hi i h B ISDN2 1 M h h th hi i th B ISDN
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2.1 M hnh tham chiu giao thc B-ISDN2.1 M hnh tham chiu giao thc B-ISDN
Cu trc
Theo chiu dc chia thnh cc lp:- Lp vt l: lin quan n chc nng phng tintruyn dn (Tch tbo ri, hu cc tbo khng
hp l v.v)
- Lp ATM: truyn ti cc thng tin ti c c lp trn
di dng tbo- Lp AAL: Tng thch cc dch v khc nhau lp trn vi lp ATM v ngc li
PHN 2 : M HNH THAM CHIU GIAO THCPHN 2 : M HNH THAM CHIU GIAO THC
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PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
N : N C U G O CMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISD
2.2 Lp vt l ca B-ISDN2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
2 2 L t l B ISDN2 2 L t l B ISDN
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2.2 Lp vt l ca B-ISDN2.2 Lp vt l ca B-ISDN
c chia thnh 2 phn lp:
Phn lp mi trng vt l (Physical dium) Phn lp hi t truyn dn (Transmission
Convergence)
2 2 L t l B ISDN2 2 L t l B ISDN
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2.2 Lp vt l ca B-ISDN2.2 Lp vt l ca B-ISDN
Phn lp mi trng vt l (Physical Medium)
- Chc nng mi tr ng vt l truyn dn: quy nhgiao din quang, cc bpht quang, thu quang,connector ..
- Chc nng nh thi bit: Bin i lung bit sangdng ph hp vi mi tr ng truyn dn, chn cc
thng tin nh thi, m ho v gii m ng. Ktqu l thng tin c truyn t lp PM ln lp TMch yu l cc lung bit/symbol v cc thng tin nh
thi tng ng
2 2 L t l B ISDN2 2 L t l B ISDN
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2.2 Lp vt l ca B-ISDN2.2 Lp vt l ca B-ISDN
Phn lp hi t truyn dn
- To v khi phc khung truyn dn
- Tng thch khung truyn dn: gn cc lung tboATM vo cc khung truyn dn, hay ngc li tch cc
tbo ATM t cc khung truyn dn.- Xc nh bin gii tbo (cell delineation):Xc nh
bin gii tbo trong lung tbo thu c
pha pht: thc hin chc nng chn trng HEC, trnphn thng tin.
pha thu: da vo HEC xc nh bin gii tbo,gii trn
2 2 L t l B ISDN2 2 L t l B ISDN
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2.2 Lp vt l ca B-ISDN2.2 Lp vt l ca B-ISDN
Phn lp hi t truyn dn
- To v k im tra tr ng HEC:
Pht: m ho 4 byte thnh 1 byte HEC
Thu: pht hin li, sa li
- Tng thch tc tbo: thc hin chc nng
chn tbo ri tng thch tc d ca lp t boATM truyn xung vi tc truyn lp vt l.
PHN 2 : M HNH THAM CHIU GIAO THCPHN 2 : M HNH THAM CHIU GIAO THC
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MNG B-ISDNMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISDN
2.2 Lp vt l ca B-ISDN2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
2 3 L ATM B ISDN2 3 Lp ATM ca B ISDN
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2.3 Lp ATM ca B-ISDN2.3 Lp ATM ca B-ISDN
- Lin quan n tt c cc trng tbo trong phntiu (tr HEC)
- VPI/VCI:To/tch tiu Ghp knh/tch knh cc tbo ATM
Bin dch t VPI/VCI c sang VPI/VCI mi ccnode chuyn mch- GFC:
iu khin lung t ngi s dng vo mng Chia s ti nguyn cho u cui- PT : gm 3 bit xc nh loi ti trng ca t
bo- CLP: xc nh u tin
PHN 2 : M HNH THAM CHIU GIAO THCPHN 2 : M HNH THAM CHIU GIAO THC
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PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISDN
2.2 Lp vt l ca B-ISDN2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
- Gii quyt bt k s khc bit no gia dch v c
cung cp bi lp ATM cho ti khi p ng c ccyu cu dch v.
- Trong lp AAL ny cc n v giao thc lp caohn nh n v s liu dch v SDU ( Service DataUnit ) hay n v s liu giao thc PDU ( Protocol
Data Unit ) c b tr sp xp theo mt cch xcnh thnh cu trc d liu ca trng ti tin 48 Byteca t bo ATM. Lp ATM s thc hin ghp tiu
vi cc gi tr VPI/VCI thch hp cho cc t bo ny.
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Nhm n gin ho cc giao thc AAL v dch vcho khch hng rt phong ph a dng v khc nhau dovy rt kh ( thm ch khng th ) c mt giao thcchung cho mi dch v => Phn loi dch v B ISDNtheo cc tiu ch:
-Thi gian thc hay khng
- Tc c thay i khng
- Kiu kt ni
=> C 4 loi dch v: A,B,C,D
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Loidch v A B C D
Thi gian thc C C Khng Khng
Tc Khng C C C
Kiu kt ni CO CO CO CL
AAL AAL1 AAL2 AAL3/4,5
AAL3/4,5
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
thc hin cc chc nng nu trn lp thch ngATM AAL c chia thnh hai lp con:
- Phn lp kt hp hi t CS ( Convergence Sublayer )
- Phn lp ct mnh v ti hp SAR ( Segmenting AndReassembling Sublayer ).
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Phn lp hi t
- CS thc hin chc nng phi hp v thch ng gia cc
lp cao v lp AAL, m bo cc tham s cht lng dchv QOS to cc thng tin dch v cho khch hng lp cao,cho cc hnh loi dch v ng dng, iu khin cc th tc
ng gi/ m gi cc mu gi s liu CS-PDU.- Chia thnh hai lp con: phn ph thuc dch v SSCS(Service Specific CS) v phn chung CPCS (Common Part
CS)trong SSCS c th l Null, ngha l khng cn CPCSlun lun phi thc hin kt hp vi SAR. Cc lp con ny
chuyn cc tin t nh cc PDU gia cc lp AAL - SAPti ATM - SAP
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Phn lp ct mnh v ti hp SAR
- Pha pht: c chc nng to cc t bo ATM tcc n v d liu t lp cao chuyn xung v nhdu c cc n v s liu pha ch,
- Pha thu: thc hin cc chc nng ngc li khi phc bn tin ban u t cc t bo ATM thu
c.
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Hnh: M hnh phn lp giao thc AAL.
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
Hnh: M hnh phn lp giao thc AAL.
AAL - SDU
PayloadHeader Trailer
Header Trailer
48 byteHeader
Lp cao hn
CS
SAR
Lp AAL
Lp ATM
CS-PDU
SAR- SDU SAR- SDU Phn mnh
SAR-PDU
ATM -PDU
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
CS PDU for AAL 3/4
- CPI: cho bit n v c s dng trng Basize
- B tag (Beginning )
E tag (Ending)
Btag v Etag ging nhau => pha thu so snh pht hin li- PAD thm vo phn payload l bi ca 4
- AL: thm vo trailer 4 byte
- LI: ch th di
1-65535 0-31 1 2
Payload PAD ALCPI Etag LIBtag BAsize
1 2 1
2 4 Lp thch ng ca B ISDN2 4 Lp thch ng ca B ISDN
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2.4 Lp thch ng ca B-ISDN2.4 Lp thch ng ca B-ISDN
CS PDU for AAL 5
- PAD thm vo phn payload l bi ca 4
- CS-UU: thng tin ngi dng - ngi dng trong sut
- CPI: xc nh CPI tung ng l phn chung hay khng
- AP: thm vo trailer 48 byte-LI: ch th di
-CRC : kim sot li
1-65535 0-47 1 42
Payload PAD CPI LICS-UU CRC
1
PHN 2 : M HNH THAM CHIU GIAO THCPHN 2 : M HNH THAM CHIU GIAO THC
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PHN 2 : M HNH THAM CHIU GIAO THCMNG B-ISDNMNG B-ISDN
2.1 M hnh tham chiu giao thc B-ISDN
2.2 Lp vt l ca B-ISDN2.3 Lp ATM ca B-ISDN
2.4 Lp thch ng ca B-ISDN2.5 Cc lpca o ca B-ISDN
2 5 Cc lp c aoca B ISDN2 5 Cc lp c aoca B-ISDN
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2.5 Cc lp c aoca B-ISDN2.5 Cc lp c aoca B-ISDN
Mt bng iu khin v bo hiu AAL( Control and Signalling plane AAL ).
Mt phng ngi dng. Mt phng qun l