Chuong 2 - KT Truyen So Lieu

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Text of Chuong 2 - KT Truyen So Lieu

  • M ha knh

    d

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  • (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

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  • M 8 bit EBCDIC

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  • M ASCII 7 bit

    8 bit

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  • M ASCII

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  • - point).

    - Multidrop).

    Sao (Star).

    Vng (Ring).

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  • Bn song cng (half-duplex

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  • Song cng (full-duplex

    (telephone).

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  • -9/16/2013 11

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  • (Bn phm my tnh)

    Start bit

    Stop bit (bit 1).

    (Asynchronous transmission)

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  • (Asynchronous transmission)

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  • Nguyn l :

    )

    (Asynchronous transmission)

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  • Truyen bat ong bo

    (Asynchronous transmission)

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    chnh xc

  • (Asynchronous transmission)

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    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).

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  • (Asynchronous transmission)

    :

    Stuffing).

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  • (Asynchronous transmission)

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  • :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

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  • : TSLDLE

    1200bps.

    a.

    b.

    c.

    khc).

    (Asynchronous transmission)

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  • (Synchronous transmission)

    khng c Start Bit v Stop bit.

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  • (Synchronous transmission)

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  • Encoder.

    (Synchronous transmission)

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  • (Synchronous transmission)

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  • Digital Phase-lock-loop (DPLL):

    m ho

    1 0 hay 0 1).

    4B3T, 2B1Q

    (Synchronous transmission)

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  • (Synchronous transmission)

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  • N=32

    clock.

    (Synchronous transmission)

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  • Clock

    hnh 3.3.3 d).

    (Synchronous transmission)

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  • Truyen ong bo

    (Synchronous transmission)

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    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.

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    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)

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  • -

    ).

    (Synchronous transmission)

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  • 2

    (Synchronous transmission)

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  • Hybrid.

    (Synchronous transmission)

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  • (Synchronous transmission)

    Character-

    (control characters)

    SYN

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  • (SYN)

    (Synchronous transmission)

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  • Truyen ong bo

    (Synchronous transmission)

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