mtt lecture 6 mos lecture 8-1
TRANSCRIPT
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6
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ATM (Asynchronous Transfer Mode, ) , ISDN (Broadband-ISDN, B-ISDN). 1993 .
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ATM , , . , . . : 1/1, /, SDH STM-n. : IP, SNA, Ethernet, ISDN.
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ATM, - . , . , . - , , .
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, - , . 20- .
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ATMUNI NNI B-ICI
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(Virtual Channel Identifier, VCI), . (Permanent Virtual Circuit, PVC) (Switched Virtual Circuit, SVC). - Virtual Path, , . (Virtual Path Identifier, VPI)
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ATM . SDH/SONET. - -3 (155 /). -12 (622 /). 1/1 /, . IBM Turboways ATM 155 PCI network interface card (SDH)
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ATM
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ATM, , - , - 53 . - cell. 48 , - 5 .
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, , . , , , . , 53 , 155 / 3 . ( 2%) , 125 ( 64 /).
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- , . 48 48 , 125 . 6 - , , . 32 4 , .
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48- 10 %, 32- 16 %.
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ATM , , 4 , .
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ATM (service class) . , , . - , , .
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ATM , , . - (Constant Bit Rate, CBR) (Variable Bit Rate, VBR).
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ATM , , . , , .
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ATM
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ATMPeak Cell Rate (PCR) - ;Sustained Cell Rate (SCR) - ;Minimum Cell Rate (MCR) - ;Maximum Burst Size (MBS) - ;Cell Loss Ratio (CLR) - ;Cell Transfer Delay (CTD) - ;Cell Delay Variation (CDV) - .
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QoS ATM QoS, . QoS CTD, CDV CLR. , , , .
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QoS ATM - . , , QoS, - . QoS, , Best Effort . - Unspecified Bit Rate, UBR.
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ATM
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ATM
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AAL ( Adaptation Layer, AAL) AAL1-AAL5, . AAL . AAL.
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AAL
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AAL . - (Segmentation And Reassembly, SAR). AAL (, , ) , . - (Convergence Sublayer, CS). , , , ( , ), , .
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AAL1 AAL1 (Constant Bit Rate, CBR), , , . , .
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AAL3/4 AAL3/4 (Variable Bit Rate, VBR). , , . AAL3/4 , . , - , .
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AAL5 AAL5 AAL4. , . AAL5 , , . , , D.
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AAL QoS QoS AAL . - . , .
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ATM , . , - (Virtual Path Identifier, VPI) (Virtual Channel Identifier, VCI). - , -, - , .
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ATM (Generic Flow Control) . . (VitualPath Identifier, VPI) (Vitual Channel Identifier, VCI) 1 2 . , (VPI) (VCI) . (Payload Type, PT) 3- , , - (, ). , - Explicit Congestion Forward Identifier.
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ATM (Cell Loss Priority, CLP). , , . , CLP=0 , CLP=1 - .
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ATM (Header Error Control, ) , . , , , . , SDH , . , SDH , .
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- . VPI, VCI . . , .
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VPI, VCI, (VCI), VPI . .
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ATM 20- . , ISO 7498. : http://www.juniper.net/techpubs/software/erx/junose61/swconfig-link/html/atm-config2.html#86303 .164, 1 AFI, 8 IDI - .164 (15 ), 11 DSP (Domain Specific Part) :4 , ;6 - End System Identifier (ESI), - , - IEEE;1 , .
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ATM LAN emulation, LANE ( ), . . , , , , .
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ATM , , : ( 155 622 /), ( , ), - ( ).
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ATM - Gigabit Ethernet. , , , , , Gigabit Ethernet. , . , , , Fast Ethernet.
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ATM - Internet. IP-. IP-, SDH, IP-.
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, frame relay. : CBR, , VBR, , .
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- PCR, SCR, MBS, , , . , . SONET/SDH PDH. , - B-ISDN, ISDN.
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