Research And Implementation Of Protocol Analysis In The GPON Protocol Analyzer

With the widen application of Internet and mobile Internet, the broadband services, such as the web TV and network videos services, present an explosive growth. Existing network bandwidth has been unable to meet the bandwidth requirement of the current users, and fiber has more advantages than the copper wire in many aspects, such as the bandwidth. In the big background of realizing the "broadband China" and the "triple play", there is no doubt to bring the new opportunities for the development and promotion of broadband optical fiber access technology. Due to its simple devices, easy implementation feature, and the ability of bearing rich businesses, PON has attracted many international researchers’ attention. PON technologies are mainly used in EPON and GPON. As GPON has more advantages than EPON in some aspects, such as high transmission rate and high bandwidth utilization, GPON has become an attractive candidate for the broadband access. GPON protocol analyzer is a key device to promote GPON research and application developments, however, now, there are only three institutions engaged in researching and developing the PON protocol analyzers in the world, and none of them are belonging to China. Therefore, the researches associated with PON-protocol-analyzer are vital for the promotion and application of the PON technologies. In this thesis, the main work focuses on the GPON frame data analysis, the prototype researching and testing. It involves GPON frame data analysis, hardware module and the corresponding software and interface design. GPON frame data analysis consists of both upstream and downstream data frame analysis. Downstream data frame analysis includes GPON GTC frame header data analysis, the GEM payload analysis, and the RSM packages. The specific works are listed as follows:1) the software configuration of circuit board to realize the CPU-controlled working states. Chip configuration of the circuit board includes: clock control, sampling clock setting, the FPGA working state control, etc. External communication includes: GUI communications, Telnet, TCP Socket, shell window, TFTP.2) GUI interface control, display design, and files loading. Control functions include the circuit board working state, the GUI and bottom circuit board communication, system reset, filtering conditions, capture mode, etc. Display functions include data analysis, DBA histograms, and the circuit-board basic information display. Based on the existing schemes, a novel files loading method is proposed, capable of providing the FPGA logic files dynamic loading and the APP files dynamic loading, and with advantages of high flexibility, reliability and low time latency.3) GPON upstream frame data processing, docking delimited data, data reordering, descrambling, data monitoring, abnormal state reporting, packets restructuring, adding the reorganized data into common data queues or OMCI dedicated queues; Downstream data processing includes the BJP verifying, BWmap-based TCONT data distributing, HEC checking for GEM header, obtaining the frame header PLI, PTI and Port-ID, extracting GEM frame payload according to the PLI, directly discarding the GEM frame payload and LCDGi warming for the case of checking out the unrecoverable errors in HEC verification, counting the failures in HEC verification for each ONU_ID unit. A new approach has been proposed to extract the GEM payload with high engineering practicality and adaptability, and enhanced reliability and stability.