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Dataöverföring av skilda datatyper på gemensam länk via multiplexing
Mälardalen University, School of Innovation, Design and Engineering.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesisAlternative title
Data transmission with diffrent data types in a common link with multiplexing (English)
Abstract [sv]

När olika datatyper överförs mellan två platser har, historiskt sett, detta skett på skildinfrastruktur; analoga signaler för sig, och digitala data för sig. Inom flygindustrin hanteras båda dessa datatyper än idag, då övergång från analoga röstsamtal till digitala röstsamtal tar tid. För att förenkla infrastrukturen är det önskvärt att skicka all data på samma medium. Time Division Multiplexing (TDM) möjliggör detta och har studerats med fokus på robusthet och prestanda. Studien har fokuserat på hur TDM-enheter ska konfigureras med avseende på Ethernet-frame-storlek för att till fullo utnyttja länkkapaciteten. Teoretiska resonemang har validerats av experimentella data som utförts på TDM-enheter sammankopplade med en fiberlänk. Antalet förlorade frames för systemet har mätts med varierande datatillförselshastighet. Detta upprepades för ett flertal Ethernet-frame-storlekar. Mindre frame-storlekar gav en högre möjlig överföringshastighet innan data förloras, och uppvisade koherens mellan teori och experiment. Stora frame-storlekar fyllde i snitt TDM-tidsluckorna sämre, och gjorde att databuffert på enheten fylldes snabbare än för mindre framstorlekar. Detta ledde till dataförluster i systemet. Andra faktorer, som overhead och payload, gjorde att framestorleken borde väljas efter applikation. Mindre datamängder som skickas ofta kan med fördel använda mindre frame-storlekar, medan stora datamängder som behöveröverföras snabbt effektivare överförs med större frame-storlekar.

Abstract [en]

When transferring different data types between two sites, they have historically been transferred on separate infrastructures; analog signals separately, and digital data separately. Within the aviation industry, both these data types are still handled today, as transition from analog voice data to digital voice data takes time. To simplify the infrastructure, it is desirable to send all data on the same medium. Time Division Multiplexing (TDM) makes this possible and has been studied with focus on robustness and performance. The study has focused on how TDM devices should be configured with respect to Ethernet frame size to fully utilize link capacity. Theoretical reasoning has been validated by experimental data performed on TDM devices coupled with a fiber link. The number of lost frames for the system has been measured while varying data rates. This was repeated for several Ethernet frame sizes. Smaller frame sizes showed a higher possible transfer rate before data loss was recorded. This shows coherence between theory and experiments. Larger frame sizes were less good at filling the TDM time slots, causing data buffer on the device to overflow faster than for smaller frame sizes. This created data loss in the system. Other factors, such as overhead and payload, implies that the frame size should be chosen by application. Smaller data volumes that are sent frequently have an advantage when using smaller frame sizes, while when handling largeramounts of data that need to be transmitted quickly, it is more efficient to use larger frame sizes

Place, publisher, year, edition, pages
2017. , 26 p.
Keyword [sv]
TDM, Time Division Multiplexing, Multiplexing, Dataförlust
National Category
Computer Science
Identifiers
URN: urn:nbn:se:mdh:diva-35616OAI: oai:DiVA.org:mdh-35616DiVA: diva2:1107040
External cooperation
Combitech AB
Subject / course
Computer Science
Supervisors
Examiners
Available from: 2017-06-19 Created: 2017-06-08 Last updated: 2017-06-19Bibliographically approved

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