the any decision-making’s scientific nature and the reliability are take the information as the foundation, the information and the decision-making are in the identical management process two aspects, therefore the profession informationization has also become the people discuss and are practicing the important topic, the numerous profession thumb start in abundance each kind of application plan, and has obtained the huge success, causes the informationization construction to have the attraction. is opposite in large-scale says using the community, Small and medium-sized enterprise’s informationization construction project usually has the scale to be small, the structure simple characteristic, the comprehensive funding invested, the professional as well as the future will develop and so on factors, the network usability, the security and the development (promotion transformation ability) are the small and medium-sized enterprise realize the informationization management overriding demand, therefore, the cost will be inexpensive, the operation simple, will be advantageous for the maintenance and can satisfy the management platform which the service operation will need is this domain true demand. Concentrates work this realistic characteristic in view of the domestic overwhelming majority Small and medium-sized enterprise, the dragon Uygur corporate design small and medium-sized enterprise informationization plan (e.g. chart), can display the enterprise network’s use effect and the level well, has the very strong representation.

　　This is a simplification enterprise network design proposal, adopts the star network architecture, the middle segment use must shields the ultra five kind of twisted pair lines. Its dominant character has applied based on port’s VLAN technology, will occupy the computer which in the identical department needs to correspond frequently to compose a subnet, the majority implements the services department system the enterprise to use this kind of pattern, this network way has two big superiority, on the one hand can avoid the sensitive data visiting easily by the subnet outside non-authorized user, on the other hand can also prevent the network congestion which or the paralysis effectively causes because of the broadcast storm impact, enhanced system’s security greatly.

　　OPF 10/100M auto-adapted (eight or 16) the switchboard connects this department’s all work terminal, constitutes a subnet together. Each work terminal uses OPF 10/100M the auto-adapted PCI fast ether network card. If takes the general work application, enters the net computer is not many, to between workstation transmission speed too high request, the work terminal has not been possible to use 10M generally the ether network card, but server to respond the multiuser request well, still needed to provide 10/100M even 100M the network card. In the future when will cause the entire network promotion is the 100M fast ethernet, will only need to replace in each work terminal the network card then.

　　The enterprise network central point uses OPF eight or 16 10/100M auto-adapted switchboards, all subnets turn on the central switchboard. This kind of design causes to occupy in enterprise network’s each stand to be possible to monopolize the 100M band width. The OPF switchboard uses the memory repeater exchange pattern, can guarantee fully the data transmission the integrity, the built-in 2M buffer may satisfy the small and medium-sized enterprise internal communication fully the need. The OPF switchboard has established a UP-LINK connection, may realize many switchboard’s connections through the level company, convenient enterprise network’s development and promotion, simultaneously also easier system’s maintenance. Moreover, according to department’s actual need, various webpages may install voluntarily engraves records equipment and so on meter, scanner, realizes hardware sharing. Regarding technology development, financial control and so on sensitive department, but the User departments agent server (replaces by high efficiency PC machine), depositing important data. In order to strengthen to the house document, the data, the telephone, the facsimile centralized management, realizes between the enterprise network stand correspondence, this plan established the printing, the database, the file server (three to be possible separately to concentrate to high efficiency PC on) and the server, the server might cause the enterprise not to need to apply for the mail address to the telecommunication department for the staff, might realize this goal through own server. In this plan’s firewall server through the software way examination user status or the authorization, may prevent effectively from the network interior and the exterior threat, will reduce the network information the security risk.

　　If will not have the corresponding router to establish VLAN to cause during different VLAN the equipment to be unable to correspond, only if will intend such to do, otherwise in this case will divide VLAN is wise. Since VLAN may regard as the physical separation the network, the switchboard takes the second equipment only to be able to distinguish the MAC address, but cannot realize between the different network correspondence. Therefore between the VLAN correspondence can only draw support has the third function to grasp each subnet IP address and the subnet mask router realizes. The traditional router connection different subnet needs many ports (by subnet integer decision), but in the plan uses Shan Bi the router only needs a port then to be possible together with all subnets, thus causes the network to be simpler, to be economical, is effective. Certainly, the switchboard connection router’s port must be the public port, can simultaneously connect many VLAN.

　　Realizes the enterprise network and Internet’s connection is the small and medium-sized enterprise informationization important component, regarding the general enterprise users, ISDN and ADSL is the ideal surfer way, they are based on the PSTN telephone network this kind of cover area broadest network system, but both also have the obvious difference: ISDN already has the installment to be simple, the technology is mature, the low in price the superiority, simultaneously also has the speed slow (128K), the system insufficiently to stabilize and to need shortcomings and so on digit dialing surfer; But ADSL has the speed to be quick, the system stable, does not need merits and so on digit dialing, also has the technology to be not very mature, to enter the market to be short as well as price soaring question. Between both does not have in technical the contradiction, is only the user community which faces is different, the general enterprise users must link to own reality to differentiate fully.