fr-atm 技能评估体系

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 ProtocolsFRATMFrame RelayATMFRAME RELAYATMUNIUNIService InterworkingFast Growth of Frame Relay ServicesConcentration of Low Speed Remote ConnectionsHyb

4、rid 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 Need1.5-45Mbps256K-45Mbps56K-1.5M

5、9.6-256 KbpsHQRegional HQ & Data ProcessingSmall Remote OfficesMobile Workers & TelecommutersFR orATMFR orATMFRFRDialupServiceCorporate OrganizationConcentration Of Low Speed Remote SitesAllows High Speed Access at Main Location, Low Speed Access at Remote SitesEnsures Each Site is Provided a Soluti

6、on that Delivers the Best Price PerformanceLowers Overall Cost of Network Ownership Requires Service Interworking56KDial Access1.5M768K256KISDN45M56KATMFrame Relay1.5MRemote Site Concentration ExampleHybrid Networks Combine Frame Relay, ATM, and Private Lines to Optimize Price/Performance56KDial Acc

7、ess1.5M768K256KISDN45M56KATMFrame Relay1.5M45MDS-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

8、 Site 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 PointsATMUNIATM NetworkATMUNIRRFRNetworkFRNet

9、workFR-UNIFR-UNIFR-NNIFR-NNIIWFIWFQ.922CorePHYPHYATMSARCPCSFR-SSCSQ.922CorePHYUpper LayersPHYSICALATMUpperLayersQ.922CorePHYPHYPHYATMSARCPCSFR-SSCSQ.922 CoreIWF: Interworking FunctionFR/ATM PVC Network Interworking Scenario 1Standards UpdateFrame Relay Forum FRF.5ITU I.555RFC 1490 is Used at Both CP

10、E End PointsATMUNIATM NetworkATMUNIRRFRNetworkFR-UNIATM Router is FR “Aware”(FR-SSCS+LMI)FR-NNIIWFIWFQ.922CorePHYPHYATMSARCPCSFR-SSCSPHYATMSARCPCSFR-SSCSUpper LayersPHYSICALATMUpperLayersQ.922CorePHYIWF: Interworking FunctionFR/ATM PVC Network Interworking Scenario 2Standards UpdateFrame Relay Forum

11、 FRF. 8ITU I.555Transparent Payload Transport (No Protocol Processing)ATM AAL5-CPCS (FR Headers NOT Preserved)ATMUNIATM NetworkATMUNIRFRNetworkFR-UNIFR-NNIIWFRATM Router is “NOT”FR AwareQ.922CorePHYPHYATMSARCPCSNull SSCSPHYATMSARCPCSNull SSCSUpper LayersPHYSICALATMUpperLayersQ.922CorePHYIWF: Interworking FunctionFR/ATM Service InterworkingTransparent ModeATMUNIATM NetworkATMUNIRFRNetworkFR-UNIFR-NNIIWFRATM Router is “NOT”FR AwareStandards UpdateFrame Relay Forum FRF. 8ITU I.555Q.922CorePHYPHYATMSARCPCSNull SSCSPHYATMSARCPCSNull SSCSUpper LayersPHYSICALATMUpperLayersQ.922CoreP