The Research And Application Of The Embedded System In WRON And Optical Access Network

The content of this thesis is about the research and application of embedded system in all optical wavelength router and the IPTV system transmitted over EPON.All optical wavelength router, which is considered as an intelligent combination of the wavelength granularity and the IP network, addresses by wavelength in optical field and realizes wavelength routing. In this thesis, a microprocessor based on ARM7TDMI is used to construct a typical embedded hardware system with good expansibility according to the requirement of functional subsystem. And printed circuit board is designed. Based on this kind of architecture, a software design method is introduced in detail. And this thesis designs the system software, including BOOTLOADER, hardware drivers and full applications. As a result, the integrated controllable embedded system with both software and hardware is built up. Finally, based on this embedded system, a type of all optical wavelength router that is controlled by electron and exchanged in optical field is constructed. It can be easily operated and dynamically configured. And each performance index is tested.EPON technology is the combination of fiber technology and Ethernet technology, which make it an important technology in FTTH. Digital TV program is the most important services in FTTH. From this sense, IPTV is a system transmitting digital TV programs through the IP network. Based on a DVB standard reference, this thesis realizes the IPTV decoding system by transplanting the software and modifying the front-end interface, which includes hardware module and software drivers.Although two typical embedded systems with different applications are involved in this thesis, we strive to introduce the general design methods from the principles. We bring forward a type of developing method of embedded system, which has excellent feasibility and high engineering practical value. It can be taken as guidance to development other embedded systems. There is also some originality by transplanting a software platform to another.