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АТМ (Asynchronous Transfer Mode). Лекция 13. Предусматривает интегрированную передачу данных, речи и видео в едином канале. На сегодняшний день используется на канальном и физическом уровнях.

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АТМ (Asynchronous Transfer Mode)

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(Asynchronous Transfer Mode)

13


  • , .

  • .

  • . ( )


  • :

    • : 155 622 / ( , , )

    • : 2 / ( HDLC ) .

  • SDH (. SDH).

  • IP-.

  • (VC), (VP) .


  • : 53

    :

  • -

  • -.

5

48


-

-

8

8

VPI

VPI

VPI

VCI

VPI

VCI

VCI

VCI

VCI

VCI

( )

VCI

VPI


  • PNNI ( OSPF).

  • VCI -. .

  • VC , .

  • .


(VC)

(VP)


VCI=15

2

VCI=10

VCI=7

VCI=11

1

3

4


. BR - Constant Bit Rate ;

VBR - Variable Bit Rate .


( )

  • CBR(Constant Bit Rate): , (, ) : .

  • rtVBR (Real Tie Variable Bit Rate): ( , ). : , .


  • nrtVBR(Non-Real Time Variable Bit Rate): ( , ), . : , .

  • ABR(Available Bit Rate): . : . TCP.

  • UBR (Unspecified Bit Rate): , , , . : .


(AAL)

:

AAL1 , ,

AAL2 - , ,

B

AAL3/4 ,

,

AAL5 , .

IP


  • :

    • ( IP)

    • QoS .

  • :

    • (VPI) (VCI)


  • :

    :

    • (, )

    • ( , , , , . , .

      - 27- . : .


:

AAL,

AAL


  • , .

  • , , .

  • , .

    : .


  • , .

  • : GCRA (Generic Cell Rare Algorithm) : , , .

  • AAL5 PPD (Partial Packet Discard) , , .

  • RED EPD (Early Packet Discard). , PPD.


IP

  • IP/ AAL5 , (1-65535 ), VC.

  • IP- ( ) ( )

  • IP- LLC/SNAP IP-


IP-

48

LLC/SNAP

(8)

IP- (1-65535 )

(8 )

(2 )

(16 )

(32 )

Ethernet

- IP-.


  • . ( ) 48 , ( )

  • .

  • . .

  • MTU= 9180 . IP- , IP .


  • ,

  • IP-

  • (multicasting)

  • (, SDH)

  • (, , -)


:- - - QoS:- - - QoS IP-: , . TCP/IP.


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