Global ETD Search

1	Funkční testování sběrnice CAN Flexible Data-Rate Macek, Mojmír January 2019 (has links) The topic of this thesis is the transfer of information in vehicles using bus systems. The theoretical part is devoted to the description of communication as a means of passing information and to the mode of communication between individual technical systems via communication networks. Furthermore, it summarizes the specifics of selected communication systems. The practical part of the thesis includes an experiment for which the building of a CAN FD bus model was required. For communication purposes, the programming of SPI protocol on the Field Programmable Gate Array (FPGA) was crucial to provide access to the CAN FD controller. The result is a bus receiving and transmitting test and a timing test for reading and writing data.
2	Network Traffic Regulator for Diagnostic Messages in Modular Product / Reglering av nätverkstrafik för diagnoskommunikation i en modulär produkt Thakrar, Nikhil January 2017 (has links) The aim of this thesis project is to explore a network traffic regulator using bandwidth management techniques that regulates data traffic with the objective to use the network bandwidth to its maximum capacity while ensuring that the network is not overloaded. The bandwidth in the existing network architecture is shared between two co-existing, distinct data flows for on-board communication and diagnostic communication in an in-vehicle network. The diagnostic communication must not interfere with the more critical on-board communication and it should comply with the remaining bandwidth. In the existing solution, fixed delays are imposed on the data traffic which result in a waste of network capacity. The approach presented in this thesis uses two regulation algorithms for different types of diagnostic services. One regulation algorithm is activated for diagnostic services that require data segmentation and multiple data frames to accommodate the transferred data. This algorithm makes use of the Flow Control parameter Separation Time specified in ISO 15765-1:2011 "Road vehicles -- Diagnostic communication over Controller Area Network (DoCAN)". The other algorithm regulates diagnostic services that generate bursts of single frames where data segmentation is not required and it does so using traffic shaping techniques. The results in this thesis show that the network traffic indeed can be regulated for different diagnostic services by using the two mentioned regulation algorithms. The results also show that data is not lost due to high network utilisation and that the bandwidth is used to its maximum capacity without having to impose fixed delays on the network system. The regulator is adaptive in the sense that it can be used for different vehicle configurations with compatible network systems to ensure quality of service and a robust network system. / I detta examensarbete är målet att utforska en metod för att reglera nätverkstrafik genom att använda tekniker inom bandbreddshantering med syfte att utnyttja bandbredden till dess maximala kapacitet utan att överbelasta nätverket. Bandbredden i den nuvarande nätverksarkitekturen delas mellan två dataflöden för onboard kommunikation och diagnostisk kommunikation. Den diagnostiska kommunikationen får inte på någotvis störa onboard kommunkationen och får anpassa sig till den bandbredd som kvarstår. I det existerande systemet införs fixa fördröjningar i nätverkstrafiken vilket medför ett onödigt slöseri på nätverkskapaciteten och som också medför att de diagnostiska tjänsterna tar längre tid att utföra. Tillvägagångssättet som presenteras i detta arbete använder två regleringsalgoritmer för olika typer av diagnostiska tjänster. En algoritm används för tjänster som kräver datasegmentering och flera dataramar för att skicka data. Den här algoritmen använder parametern Separation Time som är specificerad i ISO standarden 15765-1:2011 "Road vehicles -- Diagnostic communication over Controller Area Network (DoCAN)". Diagnostiska tjänster som istället genererar en skur av enstaka dataramar regleras med en traffic shaping algoritm som heter Token Bucket. Resultaten i detta arbete visar att det går att reglera nätverkstrafiken för olika typer av diagnostiska tjänster genom att använda de två utvecklade algoritmerna. Resultaten visar också att data inte går förlorat vid höga nätverkslaster och att bandbredden används maximalt utan att behöva införa fixa fördröjningar i nätverkssystemet. Regleraren är adaptiv i bemärkelsen att den kan användas för alla tänkbara fordonskonfigurationer med kompatibelt nätverkssystem för att försäkra quality of service och robusthet. Controller Area Network CAN Diagnostics Scania UDS KWP OBD J1939 Network regulator bandwidth management Token Bucket Traffic shaping vehicle bit stuffing OSI model arbitration Computer Sciences Datavetenskap (datalogi)
3	Changing from the silo model to the horizontal layers model in public policy regulations: the implications and potential for the telecommunications industry Spencer Logan, Lemuella C. 12 1900 (has links) The end of the Twentieth Century and the start of the Twenty First Century has been a tumultuous time for the Telecommunications Industry. Even as it moves forward to embrace the new technologies the Industry finds itself embroiled in issues of governance. The Industry finds itself in a dilemma since innovations increase at a rate faster than the laws can be changed and these render its existing laws and policies to be in some cases obsolete and inappropriate for the reality of the present. In the past, the United States of America has relied on vertically integrated top down laws and methods of regulating all the different parts in its Telecommunications Industry. These laws are contained in the different numbered Titles of this Countrys Legal Codes. Since the inception of these laws, emphasis was placed in creating and documenting policies structured by industry, sector and type of content. This form of regulation is usually referred to as the Silo Method. However, in recent years, especially in the regulation of the Telephony industry, the method of law and rule formulation moved from content regulation to one in which the technologies are getting regulated in what has been described as a Layers Method. This paper first considered whether the Silo Method of regulation is in actuality the same as using the Horizontal Layers method and showed that this is the case. Then it determined that Enhanced Services are the same as Basic Services and that Telecommunications Services are the same as Information services and showed that given that the pair sets as noted were the same, it went on to conclude that all these services were essentially the same. While studying to some detail the technologies of VoIP, the paper also showed that VoIP although an Internet technology is similar to traditional telephony, and is both a Telecommunications Service and Information Service based on the definition as given in the law as well as the technologies that are used and that as a result of this, the current regulatory environment for this service with regards to telephony is inconsistent. It concluded that Telecommunications policies though now adequate may need to be modified. Telecommunication/Internet Issues Telecommunications regulations Cable networks Cellular networks Common carriers Competitive carriers Computer inquiries Convergence Deregulation Digital networks FCC Federal Communications Commission Fiber optics Gatekeepers Gateways H.323 Horizontal Layers Model ICANN ILECs Information services Intelligent Network Architecture ISDN LAN LECs Loops LRN Call Flow MAN Network speed Networks NTIA OSI Model OSS Packet networks Packet switches Policies Protocols PSTN Networks PUCs Regulation SIP Spam SPY ACT Switched networks TC/IP Protocol Telecommunications Act of 1996 Telecommunications regulations Unbundled access UNCTAD UNICITRAL Vertical Silo Model VoIP VPN WAN Wireless Telecommunication Law and legislation Telecommunication Law and legislation

1

Page generated in 0.0548 seconds