Key words: the development and construction of network informatization With the continuous improvement of management level and the expansion of production scale, in order to reduce production costs and improve product competitiveness to meet the requirements of enterprise development and informatization, all units of the company have set up computer networks to realize computer-aided management, and the number of computers has increased from several in the past to hundreds at present, changing from single-machine application mode to network mode. In order to manage and use computer networks effectively, it is necessary to plan, develop and build networks scientifically. As an industrial park of an enterprise, network planning should build an enterprise local area network internally and connect surrounding industrial zones and surrounding factories externally, both of which should be considered in network planning. Therefore, according to this feature and the division of the company's units, the computers in the park can be divided into the following four types: first, production computers, second, management computers, third, financial computers, and fourth, labor system computers. Among these four types, the number of computers used for office management is the largest, and there are more exchanges between them. After analysis, we divide the enterprise LAN into four corresponding subnets according to the application types: production subnet (LAN1); Management subnet (LAN 2); Artificial subnet (LAN 3); Financial subnet (LAN4). These four are connected to form the backbone network of the enterprise. The network planning is as follows: LAN 1 segment is 192. 1.3 1. XXX, LAN2 segment is192.10.30.xxx, LAN3 segment is192.10.70.xxx, and the10th address of each segment is reserved as the main domain server, and the/kloc of 30 segments. The topology diagram of enterprise backbone network is as shown in the figure: Netware network, WindowsNT network and Windows2000 or Windows9X peer-to-peer network can be selected. Choose Windows2000 or Windows9X peer-to-peer network according to the scale and actual demand of the company's campus. The advantages of adopting this kind of LAN are no need to configure highly specialized servers, simple connection, convenient operation and low cost. The connection mode can be bus network structure (mostly used in production subnet), star network structure and ring network structure. Most of us choose star network structure, which has the advantages of simple connection, convenient maintenance and relatively high stability. Connecting devices are generally 8-24-port switches, network cards, optical fiber converters, optical fibers, twisted-pair network cables and other devices. In order to ensure the security of financial data, an adapter with routing is adopted at the entrance of communication optical fiber. The implementation of the network can be divided into three stages: network design, network wiring and network software programming configuration. 1, network design Network design should be based on the network planning scheme, and the network in the industrial area should be designed in a unified way. Where the optical fiber goes, which unit is the most economical and simple to set a link point, and so on. As a top priority. Regarding the wiring in office buildings, hospitals and schools, the network wiring scheme is designed on the building plan, indicating the concentration lines of each floor and the positions of information points, drawing the wiring path from the converter to each information point on the map, calculating the required network cable length according to the path, counting the required switch configuration and number and the location of wall punching according to the information points, configuring PVC sleeves and trough plates for wire protection as needed, and finally making statistics, summarizing the required wiring materials and making reasonable budget arrangements. 2. Network wiring should be carried out according to the design scheme. First, connect the switch from each information point to the configuration position, tighten the wiring harness at each connection and protect it with a trough plate or sleeve with appropriate specifications. Don't discount the middle of the network cable, try to keep it straight. Secondly, make both ends of twisted pair, and make cascaded lines and straight lines. In LAN wiring, twisted pair and RJ45 connector pins adopt two standards: 568A and 568B. Cascade lines are generally used to connect switches, using the voltage method of 568A, and straight lines are used to connect switches to computer terminals, mostly using the voltage method of 568B, which has strong anti-interference and long transmission distance. Finally, connect the converter with the switch. After the wiring is calibrated correctly, connect the switch with the computer. 3. Network configuration and software programming A. IP address allocation In the network connection, select the "IP/TCP" attribute, and input the address and subnet mask of each allocated PC according to the planned network segment, so that the IP address of the company's WEB server can be input through IE browser, and then enter the company's office automation network platform to realize browsing and publishing of company information and mutual transmission of public documents. B. Programming of management application software Each factory (including peripheral factories) in the industrial zone has compiled an internal production management system according to its own management nature, and established a local database through an internal LAN server. The industrial zone programmer completes the industrial zone information publishing platform, pipe fitting contract and finished product warehouse management system. Finally, they carried out unified planning and network merger, so that all factories in the industrial zone can enjoy data through the local area network, and all kinds of production and transportation plans and daily report data can be transmitted quickly through the local area network or the Internet, avoiding frequent fax transmission. The system block diagram is as follows: the client on the remote database or the client on the local database establishes a connection with the relay server through the Internet or LAN (the relay server has a fixed IP address /Internet domain name), and the relay server saves the dynamic IP address of each client (obtained when connecting to the Internet); The remote database needs to exchange data with the local database, and the relay server establishes a temporary channel between them (by exchanging mutual dynamic IP addresses); Data exchange is completed through remote database and local database channel.