The Research On Access Network Design In Communication System Of Digitized Community

The digitized community is organically made up of the realistic community and the fictitious community built by digitized technology. It is a key part work of the digitized community to set up its communication network. Various kinds of communication information and data are different from attribute and the transfer rate. They must transmit through the broadband network. It is not hoped that many circuits enter user's room separately for transmitting different networks business. So it is desirability to set up a comprehensive conveyance network between user's terminal device and business nodes of different business network, this means modern access network. It is the conveyance network having nothing to do with the business, but it can meet the demand for conveying information between various kinds of business networks and user's terminal devices. The access network can realize the access of the integrated service, especially the comprehensive access of business of the multimedia and IP business.The research actuality both here and abroad on access network technology in communition system of digitized community was introduced at first in this text. Secondly, the physical consults model and business performance characteristic of the access network were described. The main theoretical foundation of the access technology was also described at the same time, such as digital switching, optical fiber transmission, digital multiplexing, etc. And the common access network technology was comparatively analyzed with xDSL access, Cable Modem access based on HFC, Ethernet access, optical fiber access and wireless access. At a later time, it should be considered by us to access and cooperate directly between metro optical network and LAN when designing the communication system of digital community. Fiber to the home is the final goal of the access network. The compositions and characteristics of the metro optical network was expounded in this text. A design plan of realizing AN was provided with FTTx+ADSL+HFC/LAN. A design plan of a community's network was put forward at the end. The equipments at the design plan were provided from Shenzhen Hua Wei Communications Ltd.. It takes a digitized community's communication system construcation project as an example.FTTx+ADSL+HFC/LAN scheme has realized the unification of three nets with the access network : the public telephone network (PSTN ) , the cable televisionnetwork (CATV ) and computer Internet (Internet ). No sewing chaining with the existing network system of computer based on Ethernet can be realized in this sheme. FTTH is the final solution sheme of the broadband access network and the whole business access.