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1、Frame Relay and ATM InterworkingApproaches to InterworkingInterworking Market DriversThe Benefits of InterworkingThe Technology of Interworking (Technical Submodule)Presentation OverviewFrame Relay PVC to ATM Network InterworkingFRF.5Scenario 1 and 2SVC Interworking PlannedFrame Relay PVC to ATM Ser
2、vice InterworkingFRF.8Transparent and Translation ModesSVC Interworking PlannedApproaches To InterworkingThe Protocol In and Out of the Network is Frame RelayATM is Used in the Core of the Network to Improve Scalability and Economies of ScaleFRAME RELAYATMFRAME RELAYATMFRAME RELAYFR UNIFR UNINetwork
3、 InterworkingEach Location Uses the Technology Best Suited to its Applications and NeedsThe Interworking Function Converts Transparently Between the ProtocolsFRFRATMATMFrame RelayATMFRAME RELAYATMUNIUNIUNIUNIService InterworkingFast Growth of Frame Relay ServicesConcentration of Low Speed Remote Con
4、nectionsHybrid NetworksThe Need For InterworkingFrame Relay is Driving the Deployment of ATM NetworksHigh Speed ATM Backbones Used by Service Providers to Improve Economies of Scale and Network ScalabilityUses Network InterworkingFast Growth Of Frame Relay ServicesConnectivity NeedConnectivity Need1
5、.5-45Mbps1.5-45Mbps256K-45Mbps256K-45Mbps56K-1.5M56K-1.5M9.6-2569.6-256 Kbps KbpsHQHQRegional HQ & Regional HQ & Data ProcessingData ProcessingSmall Remote OfficesSmall Remote OfficesMobile Workers & Mobile Workers & TelecommutersTelecommutersFR orFR orATMATMFR orFR orATMATMFRFRFRFRDialupDialupServi
6、ceServiceCorporate OrganizationCorporate OrganizationConcentration Of Low Speed Remote SitesAllows High Speed Access at Main Location, Low Speed Access at Remote SitesEnsures Each Site is Provided a Solution that Delivers the Best Price PerformanceLowers Overall Cost of Network Ownership Requires Se
7、rvice Interworking56K56KDial Dial AccessAccess1.5M1.5M768K768K256K256KISDNISDN45M45M56K56KATMFrame Relay1.5M1.5MRemote Site Concentration ExampleHybrid Networks Combine Frame Relay, ATM, and Private Lines to Optimize Price/Performance56K56KDial Dial AccessAccess1.5M1.5M768K768K256K256KISDNISDN45M45M
8、56K56KATMFrame Relay1.5M1.5M45M45MDS-3DS-3DS-3DS-3Hybrid NetworksProvides Investment ProtectionConnectivity Between Frame Relay and ATM LocationsSmooth Evolution Between TechnologiesImproves Network ScalabilityLowers Cost of Network OwnershipEnsures Optimization of Network Price/Performance on a Sit
9、e by Site BasisThe Benefits Of InterworkingNetworking InterworkingScenario 1Scenario 2Service InterworkingTransparent ModeTranslation ModeA Technical View Of InterworkingStandards UpdateFrame Relay Forum FRF.5ITU I.555RFC 1490 is Used at Both CPE End Points ATMATMUNIUNIATM NetworkATMATMUNIUNIR RR RF
10、RNetworkFRNetworkFR-UNIFR-UNIFR-UNIFR-UNIFR-NNIFR-NNIFR-NNIFR-NNIIWFIWFIWFIWFQ.922CorePHYPHYATMSARCPCSFR-SSCSQ.922CorePHYUpper LayersPHYSICALATMUpperLayersQ.922CorePHYPHYPHYATMSARCPCSFR-SSCSQ.922 CoreIWF: Interworking FunctionFR/ATM PVC Network Interworking Scenario 1Standards UpdateFrame Relay Foru
11、m FRF.5ITU I.555RFC 1490 is Used at Both CPE End Points ATMATMUNIUNIATM NetworkATMATMUNIUNIR RR RFRNetworkFR-UNIFR-UNIATM Router is ATM Router is FR “Aware”FR “Aware”(FR-SSCS+LMI)(FR-SSCS+LMI)FR-NNIFR-NNIIWFIWFIWFIWFQ.922CorePHYPHYATMSARCPCSFR-SSCSPHYATMSARCPCSFR-SSCSUpper LayersPHYSICALATMUpperLaye
12、rsQ.922CorePHYIWF: Interworking FunctionFR/ATM PVC Network Interworking Scenario 2Standards UpdateStandards Update Frame Relay Forum FRF. 8Frame Relay Forum FRF. 8 ITU I.555ITU I.555Transparent Payload Transport (No Protocol Processing)Transparent Payload Transport (No Protocol Processing)ATM AAL5-C
13、PCS (FR Headers NOT Preserved)ATM AAL5-CPCS (FR Headers NOT Preserved)ATMATMUNIUNIATM NetworkATMATMUNIUNIR RFRNetworkFR-UNIFR-UNIFR-NNIFR-NNIIWFIWFR RATM Router is ATM Router is “NOT”“NOT”FR AwareFR AwareQ.922CorePHYPHYATMSARCPCSNull SSCSPHYATMSARCPCSNull SSCSUpper LayersPHYSICALATMUpperLayersQ.922C
14、orePHYIWF: Interworking FunctionFR/ATM Service InterworkingTransparent ModeATMATMUNIUNIATM NetworkATMATMUNIUNIR RFRNetworkFR-UNIFR-UNIFR-NNIFR-NNIIWFIWFR RATM Router is ATM Router is “NOT”“NOT”FR AwareFR AwareStandards UpdateStandards Update Frame Relay Forum FRF. 8Frame Relay Forum FRF. 8 ITU I.555ITU I.555Q.922CorePHYPHYATMSARCPCSNull SSCSPHYATMSARCPCSNull SSCSUpper LayersPHYSICALATMUpperLayersQ.922CorePHYRFC 1490/FR - Translate Encapsulation - RFC 1483/ATMATM AAL5-CPCS (FR Headers NOT Preserved)Protocol TranslationIWF: Interworking FunctionFR/ATM PVC Service Interworking Translation Mode
