| Optical transmission is getting more popular in the access network due to theincreasing demand for bandwidth. The most advertised transport solutions for the opticalaccess are Passive Optical Network (PON). Gigabit-capable Passive Optical Network(GPON) is the most advertised one in the PON technology. This paper is a summarizing ofour study on it's multimedia terminal—Optical Network Terminal. The content of thispaper is as follows:Firstly, introduce the ITU-T G.984 specified GPON optical access network system,analyze the structure, Optical network requirements, key techniques and networkmanagement technique of the system. Also make a summary of the actuality of GPON.Secondly, analyze the transmission convergence layer of ONT particularly, protocolstack of GPON system is brought forward and the main function of GTC is introduced.Besides Studying up on the structure of the upstream and downstream frame, the meaningand function of various fields contained in frame is discussed.Thirdly, analyze the network interfaces and user network interfaces of the ONT underfibre to the home environment. Accomplish the structure design for ONT and set forth thesoftware and hardware implementary method to implement the functions of each layer ofONT.Finally, focus on framing sub-layer, which is the main part of GPON transmissionlayer, as the main point of our research and development. Implement the functions ofGPON transmission layer by Field Programmble Gate Array. Each module and thecorresponding method of designing implementation are described in detail. Mainly analyzethe frame synchronization module, message management module and ranging statesmodule and validate the correctness of the design according to the simulation charts. |
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