Ethernet Access Technology in the hottest Intellig

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With the rapid development of information technology, our daily life has gradually integrated into the network world. Since the early 1990s, Europe and the United States and other economically developed countries have put forward the concept of "smart home". Intelligent buildings have begun to move towards intelligent residential areas and enter families

in China, with the popularization of broadband access technology and the continuous improvement of housing commercialization, the demand for intelligent functions of housing has become more urgent, and intelligent buildings have gradually expanded to residential areas. The survey and Design Department of the Ministry of construction and the Housing Industry Office of the Ministry of construction have begun to jointly organize the implementation of the national demonstration project of intelligent technology in residential areas, and issued the outline of the construction of the national demonstration project of intelligent technology in residential areas in 1999. Families in modern society are beginning to pursue the information, safety, comfort and convenience brought by intelligent housing. The latter can be divided into synthetic area and waste area. The system composition of the latter pays more attention to meeting the realization and personalized needs of residents in terms of safety, comfort of living environment, convenience of community service, community management, network communication and so on

basic concepts and functions of intelligent residential areas

in the "key points and technical guidelines for the construction of national residential area intelligent system demonstration project" formulated in 1997, the following requirements are put forward for the design of residential areas: high security, comfortable living environment, convenient communication mode, comprehensive information service and home intelligent management

the intelligent community will eventually be reflected in the use of computer network, automatic control, information interactive management and other information technology and control technology to establish a community service and management integrated system composed of property management and information service center, communication access and home intelligent system, so as to realize comprehensive, real-time and effective reception, transmission, collection and monitoring of all kinds of information. The intelligent community information system provides operators and residents with a comprehensive solution to realize the intellectualization and informatization of residential communities. It mainly involves family information services, residential automation, community public services and property management services. The basic function configuration of intelligent residential community application system mainly includes the following aspects:

● information communication system: providing user voice communication, video broadcasting, broadband information services

● security system: provide community perimeter alarm system, residential indoor alarm and other alarm systems

● building equipment monitoring system: mainly the monitoring of water supply and drainage monitoring system and elevator, lighting and other equipment

● property management system: realize remote meter reading, charging and other community property management of three meters

the information system of intelligent community can be divided into two parts: information subsystem and control subsystem

● the information network subsystem is composed of data system, voice system and CATV system. On the one hand, it realizes the comprehensive access of data, voice and image, on the other hand, it provides the transmission channel for the control network subsystem. Its transmission mode is flexible, which can be FTTB + LAN, ADSL, HFC, APON or wireless, etc

● the control network subsystem can partially or completely use the information network subsystem to realize the transmission of various control signals and complete the functions of neighborhood management, home intelligent management and control, etc. Application of Ethernet Access Technology in intelligent residential areas

at present, broadband access technology mainly includes ADSL, HFC and Ethernet. ADSL technology makes full use of the original line resources, and can provide uplink 1.5mb/s and downlink 8mb/s data transmission while transmitting voice. HFC technology makes full use of the resources of cable TV network until the specimen rupture source, and can provide uplink 10mb/s and downlink 36mb/s data transmission in a shared way while transmitting TV programs. Ethernet technology adopts five kinds of lines, which can provide uplink 10mb/s and downlink 10mb/s data transmission. Unlike ADSL and HFC, Ethernet technology has obvious industry barriers (ADSL technology is used in telecommunications and HFC technology is used in radio and television), with less access threshold restrictions, maturity and reliability, simple construction and low cost. With the acceleration of the construction of broadband intelligent residential areas in China, more and more operators begin to adopt FTTB + LAN, that is, Ethernet + twisted pair (UTP) generic cabling to build the broadband network of residential areas. Because many intelligent household appliances provide Ethernet interfaces, intelligent management and control of household appliances can be realized through Ethernet. In the newly-built community, more and more real estate developers use Ethernet + twisted pair (UTP) generic cabling to build the community broadband network

1 ﹐ Ethernet access technology Ethernet access usually adopts a two-layer Ethernet switch, which works at the data link layer and provides functions such as data flow control, transmission error handling, transmission medium access control, etc. It can connect multiple local segments to form a larger local area. Ethernet switch can establish many different point-to-point dedicated channels between ports. It adopts bandwidth exclusive mode, which greatly reduces the possibility of network congestion and significantly improves the transmission efficiency of the network. Its characteristics are:

● in the network composed of Ethernet switches, any two nodes can establish a dedicated channel through the Ethernet switch, and the communication between them monopolizes the dedicated channel

● using virtual local area VLAN technology, the network can be divided into several smaller independent sub networks according to the requirements of users to isolate broadcast storms and improve the efficiency and security of the network

● expand the coverage of the network and expand the diameter of the network

● multiple local interconnection can be realized through Ethernet switches

the practical action of direct access to the community has fulfilled the original intention, mission and responsibility of the metrologist! " Facing individual users, it is required to build a community network at the lowest possible price, and take this network as a supporting platform to carry out activities such as an 5 Experiment start: click the experiment start button to provide a variety of community intelligent services such as full management, property management, user internet, shopping, video on demand, etc. Therefore, the network should be a network with high bandwidth, high reliability, low construction and maintenance costs. Ethernet can fully meet the above requirements with its good expansion performance, simple construction and low price. Different from the Ethernet of the traditional local area mode popular abroad, the Ethernet access of the intelligent community is a broadband access mode with Chinese characteristics, which has the following characteristics:

● user isolation: ensure the safety of the user data of the community, and isolate the individual users

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