Best Effort NetworksDealing w/ ComplexityLayeringEncapsulationLink Layer IssuesD A DPLLManchester EncodingMIT OpenCourseWarehttp://ocw.mit.edu 6.033 Computer System Engineering Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.Best Effort Networks- Delays - propagation + xmit + queuing + proc-Loss- Reordering- DuplicationDealing w/ Complexity- Modularity – Layering- Protocols Æ RulesLayeringApp send(“s”, msg)E2ENetPick next linkLinkCSwifimodemenetQ4,5Q3Q2EncapsulationEach layer add/remove its header/trailerDon’t look at / use payload from higher layersLink Layer IssuesDigital Æ Analog Æ DigitalFramingChannel AccessError Detection/CorrectionCarrier senseCollision DetectTDMD Æ A Æ DSender1010Rcvr1 0 1 0dataCLK0 1 0 1PLL8x oversamplingEnc DecPLLDCLKSR1110000000011111CLKunalignedCLKManchester Encoding0000 :1
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