(This report is a research on the overall plan of the public broadband network. The copyright and interpretation rights belong to the Technology Research and Development Department of China Post and Telecommunications Consulting and Design Institute; it is not allowed to reprint or extract it out of context for other purposes. The technical solutions in this report are holistic and do not guarantee the completeness, adequacy and correctness of the separation and use. At the same time, it is stated that the holder of this report cannot interpret it as a certification, recommendation or guarantee for the use of certain technologies. ? The data in this report, as well as the analysis and conclusions drawn, are related to the information available at the time. This report is not responsible for any conclusion that this report may be inapplicable or inaccurate due to changes over time. ?This report does not represent investment advice on any technology, system and product, and this report does not take any responsibility in this regard.)