6

MTT

ATM (Asynchronous Transfer Mode, ) , ISDN (Broadband-ISDN, B-ISDN). 1993 .

MTT

ATM , , . , . . : 1/1, /, SDH STM-n. : IP, SNA, Ethernet, ISDN.

MTT

ATM, - . , . , . - , , .

MTT

, - , . 20- .

MTT

ATMUNI NNI B-ICI

MTT

(Virtual Channel Identifier, VCI), . (Permanent Virtual Circuit, PVC) (Switched Virtual Circuit, SVC). - Virtual Path, , . (Virtual Path Identifier, VPI)

MTT

ATM . SDH/SONET. - -3 (155 /). -12 (622 /). 1/1 /, . IBM Turboways ATM 155 PCI network interface card (SDH)

MTT

ATM

MTT

ATM, , - , - 53 . - cell. 48 , - 5 .

MTT

, , . , , , . , 53 , 155 / 3 . ( 2%) , 125 ( 64 /).

MTT

- , . 48 48 , 125 . 6 - , , . 32 4 , .

MTT

48- 10 %, 32- 16 %.

MTT

ATM , , 4 , .

MTT

ATM (service class) . , , . - , , .

MTT

ATM , , . - (Constant Bit Rate, CBR) (Variable Bit Rate, VBR).

MTT

ATM , , . , , .

MTT

ATM

MTT

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) - .

MTT

QoS ATM QoS, . QoS CTD, CDV CLR. , , , .

MTT

QoS ATM - . , , QoS, - . QoS, , Best Effort . - Unspecified Bit Rate, UBR.

MTT

ATM

MTT

ATM

MTT

AAL ( Adaptation Layer, AAL) AAL1-AAL5, . AAL . AAL.

MTT

AAL

MTT

AAL . - (Segmentation And Reassembly, SAR). AAL (, , ) , . - (Convergence Sublayer, CS). , , , ( , ), , .

MTT

AAL1 AAL1 (Constant Bit Rate, CBR), , , . , .

MTT

AAL3/4 AAL3/4 (Variable Bit Rate, VBR). , , . AAL3/4 , . , - , .

MTT

AAL5 AAL5 AAL4. , . AAL5 , , . , , D.

MTT

AAL QoS QoS AAL . - . , .

MTT

ATM , . , - (Virtual Path Identifier, VPI) (Virtual Channel Identifier, VCI). - , -, - , .

MTT

ATM (Generic Flow Control) . . (VitualPath Identifier, VPI) (Vitual Channel Identifier, VCI) 1 2 . , (VPI) (VCI) . (Payload Type, PT) 3- , , - (, ). , - Explicit Congestion Forward Identifier.

MTT

ATM (Cell Loss Priority, CLP). , , . , CLP=0 , CLP=1 - .

MTT

ATM (Header Error Control, ) , . , , , . , SDH , . , SDH , .

MTT

- . VPI, VCI . . , .

MTT

VPI, VCI, (VCI), VPI . .

MTT

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 , .

MTT

ATM LAN emulation, LANE ( ), . . , , , , .

MTT

ATM , , : ( 155 622 /), ( , ), - ( ).

MTT

ATM - Gigabit Ethernet. , , , , , Gigabit Ethernet. , . , , , Fast Ethernet.

MTT

ATM - Internet. IP-. IP-, SDH, IP-.

MTT

, frame relay. : CBR, , VBR, , .

MTT

- PCR, SCR, MBS, , , . , . SONET/SDH PDH. , - B-ISDN, ISDN.

MTT