CHUY»‚N M CH ATM

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Transcript of CHUY»‚N M CH ATM

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    ATM

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    Noi dung :oi dung :

    Phan tch cac cong nghe chuyen mach

    Mo hnh chuyen mach

    Kien truc chu en mach ATM

    Mot so phan t chuyen mach thc te

    Khun chu en mach ATM

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    HA N TCH CAC CONG NGHECHUYEN MACHHUYE N MACH

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    CHUYEN MACH KENHHUYEN MACH KENH Da tren nguyen ly a hp phan chia thi gian TDM

    Mot ket noi luon s dung cung mot khe thi gian

    trong cac khung truyen c lap lai nh ky. thi gian tren mot lien ket vao en mot khe thi giantren lien ket ra khac

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    CHUYEN MACH KENH

    tTimeslot

    Frame

    vz y xvx O1O2

    I1I2

    x a b x a b

    zv zv

    Og

    Outcoming linkIncoming link /Timeslot

    In

    Frame

    Synchronizationaba l cf y cf y

    /Tomeslot

    Timeslot / link translation

    table

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    CHUYEN MACH KENH ot so ac ie m o tr hoan tren mot kenh truyen la nh

    o bien ong tre rat nho va co nh

    Toc o truyen co nh (v du 64kbps) => khong phup v cac c vu co toc o t en o

    Ch co mot loai toc o (64kbps) => khong phu hp cho

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    CHUYEN MACH KENH A TO C O

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    CHUYEN MACH KENH A TO C O

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    CHUYEN MACH KENH A TOC O Cung da tren nguyen ly TDM

    o e no co e ung n en c s

    Mot so kho khan va phc tap:

    khi cac kenh nay lai c chuyen mach rieng biet.

    Kho chon la cac toc o c ban e phu hp vi moi

    loai dch vu

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    CHUYEN MA CH KENH A TOC OHUYEN MACH KENH A TO C O

    S dung tai nguyen khong hieu suat

    Kho hu h vi at tnh cac d ch vu tron tn lai.

    Khong ap ng hieu qua oi vi s dao ong va ot bienthong tin

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    CHUYEN MACH NHANHHUYE N MACH NHANH

    Tai nguyen mang ch c cap cho mot ket noi khi cothong tin truyen

    cho lu thong ot bien

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    CHUYEN MACH NHANHHUYE N MACH NHANHCac han che : S phc tap cho thiet ke va ieu khien he thong.

    Co the xay ra trng hp he thong khong thoa mannhng yeu cau ong thi cua nhieu ket noi

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    CHUYEN MACH GOIHUYEN MACH GOI a ren p ng c ruyen ac e ran er

    Mode)

    Thon tin tru en c on thanh cac oi co chieu daithay oi => quan ly cac bo em phc tap

    Co c che ieu khien lu lng va sa sai tren tng

    en e => o re cao ong p u p v cac c vuthi gian thc

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    CHUYEN MACH GOIHUYEN MACH GOIThe he ke tiep cua chuyen mach goi la chuyen tiep khung (Framehe he ke tiep cua chuyen mach goi la chuyen tiep khung (FrameRelay) va chuyen mach khung

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    CHUYEN MACH GOI NHANH- Phng thcgtruyen bat ong bo (ATM)

    nhanh, Phan chia thi gian bat ong bo ATD

    (Asynchronous Time Division) va ATM.o a nang van c uyen va c uyen mac c o at yloai dch vu nao (oc lap dch vu).

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    CHUYEN MACH GOI NHANH- Phng thcgtruye n ba t ong bo (ATM) Thch h cho man ban ron a d ch vu v nhn u

    iem sau :

    o Toc o caoo Mem deo va an toan trong tng lai

    o S dung tai nguyen mang hieu suat

    o ang ong e

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    MO HNH CHUYEN MACH

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    C U TRUC TE BAO ATMU TRU C TE BAO ATMByte

    Bit 8 1

    GFC VPI

    VPI VCI

    VCI

    1

    2

    3Header

    VCI PT CLP

    HEC

    4

    5

    6

    5 ytes

    PAYLOAD(48 bytes)

    .

    .

    53

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    KET NOI AOET NOI A OKet noi ao co 2 loai :

    VCC (Virtual Channel Connection)

    rtua at onnect on

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    MO HNH CHUYEN MA CHO HNH CHUYEN MACH

    Chuyen mach VP Chuyen mach VC

    Chuyen mach VP + VC

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    CHUYEN MACH VP

    o VCI = Virtual Channel Identifier

    o = r ua a

    o VPI = Virtual Path Identifier

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    CHUYEN MACH VC

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    CHUYEN MA CH VP + VCHUYE N MACH VP + VC

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    KIEN TRUC CHUYEN MACH ATM

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    CAC HOAT ONG TRONG CHUYEN MACHATM

    Chuyen mach : gom chuyen mach khonggian va chuyen mach mao au (nhan dien

    kenh luan ly) Xep hang

    a hp va giai a hp

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    NGUYEN LY CHUYEN MACH

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    NGUYEN LY CHUYEN MACHGUYEN LY CHUYEN MACH

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    CAC YEU CAU OI VI CHUYEN M A CH ATMA C YEU CAU O I V I CHUYEN MACH ATM1010

    118

    oc o t ong t n

    Kha nang broadcast / multicastHieu suat : tac nghen, xac suat mat cell, otre chuyen mach (10-1000s)

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    CAC LOA I PHAN T CHUYEN M A CHA C LOAI PHAN T CHUYE N MACHPhan loai theo nguyen ly sap hang da vao v tr

    cua o em.

    Sap hang au vao

    ap ang au ra

    Sap hang trung tam.

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    CAC LOA I PHAN T CHUYEN MA CH

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    CAC LOA I PHAN T CHUYEN MA CH Sa han au ra

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    CAC LOA I PHAN T CHUYEN M A CH

    CA C LOAI PHAN T CHUYE N MACH

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    CAC THONG SO THC HIEN CUA PHAN THUYEN MACH ATM

    c c ang

    Toc o bo nh

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    T C B NHC B NHTnh toan toc o bo nh cho chuyen mach NxN, toc o

    ,

    - V du : N = 16, F=150Mbps, va W = 16

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    MOT SO PHAN T CHUYEN MACHOT SO PHAN T CHUYEN MACHTHC TE

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    PHAN T CHUYEN MACH KNOCKOUTHA N T CHUYE N MACH KNOCKOUT Cong bo vao nam 1987, do hang ATT Bell

    Theo nguyen ly sap hang au ra

    Co cau truc tap trung e giam yeu cau ve toc o bon au ra

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    PHAN T CHUYEN MACH KNOCKOUT

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    Bo giao tiep Buso giao tiep Bus

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    Bo tap trung - xac xuat mat cell trong botap trung

    Xac xuat k cell ti ong thi tai au vao cua bo tap trung

    1

    k N k

    k

    k N

    P PP C

    N N

    =

    1

    k N k

    k

    k N

    P PP C

    N N

    =

    1

    k N k

    k

    k N

    P PP C

    N N

    =

    Neu ch co L cell qua bo tap trung th xac xuat mat cell la

    [ ]1

    1 _ ( ) 1

    k N k

    N k

    Nk L

    P PP cell loss k LP N N

    C

    = + =

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    Bo tap trung-xac suat mat cell trong bo ( )ap trung (tt)

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    Bo tap trung-xac suat mat cell trong bo taptrung (tt)

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    Bo tap trung-Hoat ongo tap trung Hoat ongBo tap trung c cau truc t 2 loai phan t: phan tchuyen mach 2x2 va phan t tre

    input

    D

    winner loser output

    Chuyen mach canh tranh 2x2 Phan t tre

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    Bo tap trung-Hoat ongo tap trung-Hoat ong

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    Bo em va bo dcho em va bo dch Co L bo em hoat ong nh ch la 1 hang i.

    Bo dch thc hien hoat ong dch cac cell t bo tap trunga ra L bo em vi mot s am bao cac cell c lu ,

    tren.

    Cac cell c lay ra khoi L bo em e a ra au ra cung

    theo th t t trai sang phai, t di len tren

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    H t b d hoat ong cua bo dch

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    PHAN T CHUYEN MACH ROXANNEHA N T CHUYE N MACH ROXANNE Do Alcatel a ra vao nam 1990.

    Da tren nguyen ly sap hang trung tam.

    Con c goi la ISE (Integrated Switching Element).

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    PHAN T CHUYEN MACH ROXANNE o ch c nang

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    PHAN T CHUYEN MACH CoprinHA N T CHUYE N MACH Coprin Do CMET thiet ke.o CMET thiet ke. Da tren nguyen ly sap hang trung tam. Mau au tien c thc hien vi ket noi280Mbps va cac cell co 15 byte payload vay p y

    1 byte header.

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    PHAN T CHUYEN MACH CoprinHA N T CHUYEN MACH CoprinS o chc nang gom 4 phan chnh : Sieu a hp,bo em bo giai a hp va bo ieu khieno em, bo giai a hp va bo ieu khien

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    PHAN T CHUYEN MACH Coprin Boi hieu a h p

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    PHAN T CHUYEN MACH CoprinpBo sieu a h p

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    PHAN T CHUYEN MACH CoprinBo em va bo giai a hp

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    PHAN T CHUYEN MACH Coprin

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    PHAN T CHUYEN MACH AthenaHA N T CHUYE N MACH Athena

    c cong bo vao nam 1987c cong bo vao nam 1987. Phan t chuyen mach Athena au t