Project Background
Informatization drives the modernization of education, and strives to achieve leapfrog development of China's basic education, which is an important direction of China's education development. Education informatization has become the consensus of education reform. The newly built second central primary school in Zhabei District, Shanghai has a beautiful environment and first-class teaching facilities. As a supporting network infrastructure, it needs a comprehensive digital teaching network that can meet the needs of multimedia information such as teaching, voice, graphics and images, and the transmission and processing of comprehensive teaching and research information. Based on the high speed, convenience, scalability, and network construction investment costs of the network, the school decided to adopt a wireless LAN with more advanced technology and low cost. After many comparisons and careful considerations, the school chose the world's leading manufacturer-Netgear's cost-effective solution.
Customer needs analysis
The wireless network of the second central elementary school campus in Zhabei District, Shanghai, built this time is based on computers, and serves a computer campus network that aims at basic teaching, distance education, teaching and research, administrative management, and internal and external communications. The customer requested that the main campus of the teaching building on the fourth floor be used as the center to build a campus LAN network, with wired LAN as the backbone connection, and wireless LAN to cover the entire campus. The following functions are required:
1. Provide basic data transmission services to all users in the local area network of the Second Central Primary School in Zhabei District, Shanghai, and provide physical layer, link layer, network layer and interconnection of various protocols;
2. The network requires practicality, high speed, safety, economy, stability, reliability, good scalability, and easy maintenance.
3. The built-in internal LAN of the school can be used for web page access, e-mail sending and receiving (internal and external), electronic bulletin board BBS, search and query of teacher courseware production materials, library management (which can be further expanded into an electronic reading room), schools Management software (such as principal decision-making, general affairs management, educational administration management, financial management, file management, etc.) and the application and operation of various network software.
4. Realize the safe sharing of resources within the campus, provide network services for teaching, scientific research, and management, and provide basic information and teaching methods for planning, organization, management, and decision-making.
5. Provide office automation to realize the interconnection with Zhabei District Education Network.
6. The network is connected to the remote network application system and can support various business applications.
7. Support the logical structure of various network applications.
8. Consider the VLAN allocation and IP address allocation of the second central primary school in Zhabei District, Shanghai to facilitate future maintenance and unified management;
9. In the implementation of traffic management and QOS functions, it is necessary to ensure the bandwidth of key services, and at the same time ensure a certain QOS for each business, so that various applications on the Internet can be smoothly carried out.
Wireless network design
According to the design principles of wireless local area network and the specific needs of the second central primary school in Zhabei District, Shanghai, Netgear, based on the principles of advancement, openness, scalability, safety, reliability, and manageability, The district ’s second central elementary school conducted repeated demonstrations of wireless local area network, and finally realized a network design plan that really fits the user ’s actual situation. The following schematic diagram of the wireless local area network is provided:
The network system topology of the campus wireless network is star-shaped, and the network equipment is divided into two levels. The first level uses Ruijie Shida switches to form a wired campus network. The second level is that the WG602 wireless access point is connected to the first level switch by wire. The wireless access point WG602 is responsible for the wireless access of wireless network card clients.
The campus wireless network uses NETGEAR's latest wireless local area network standard 802.11g 54M wireless access point WG602 to connect to the network switch. It is convenient and quick to establish a 54M high-bandwidth wireless multimedia data network, and then connect to the Zhabei District Education through the core switch of the campus network. network.
WG602 802.11g 54M wireless access point is configured in the appropriate place on the campus and the similar APs are divided into non-overlapping channels (usually we use 1, 6, 11 channels), the classroom on the entire campus Covering every corner, it provides 54M wireless broadband network access for students to learn multimedia, and accepts multimedia teaching by teachers.
NETGEAR, as a pioneer in the field of wireless local area networks, has been leading the development trend of wireless local area networks. It not only provides 802.11b, 802.11a, 802.11g and 108M Super G wireless network products, but also provides 802.11a / b / g dual-band three-mode Mode (up to 108M in the pressurized mode of its own product) wireless network products, these devices are very suitable for the construction of data networks for school multimedia media network teaching. According to the customer's network needs, combined with the development trend of today's network technology, we provide technical solutions using NETGEAR's products based on the latest wireless LAN standard 802.11g: Wireless LAN access point WG602.
95 wireless WG602 wireless APs were selected for the wireless equipment purchased in advance in this project to provide wireless coverage for offices, classrooms, libraries, lounge areas, and playgrounds. 11 2.4g 802.11g WG311 54M wireless desktop computer network cards, 5 2.4g 802.11g WG121 54M USB2.0 wireless network cards.
The advantages of choosing IEEE802.11g wireless LAN products are: high data rate-54Mbps (same as 802.11a standard); fully compatible with 802.11b standard; under the same physical environment, 802.11g devices can achieve the same data rate of 54Mbps Provides approximately four times the distance coverage of 802.11b devices. When the data rate of 11Mbps is also reached, 802.11g devices can provide close coverage with 802.11b devices; the free 2.4GHz band is available in China; IEEE 802.11g standard products will surely be the fastest accepted in the market. It will replace 802.11b as the new mainstream standard of wireless LAN in a short time. So choose the wireless LAN solution based on the latest standard 802.11g.
The configuration of NETGEAR WG602 is as follows:
WG602 NETGEAR 802.11g 54M wireless LAN access point (AP)
Considering the construction of outdoor wireless networks, directional antennas and RF feeders need to be considered.
NETGEAR WG602 directional antenna and feeder configuration:
Omnidirectional antenna 3rd party 12.5dbi omnidirectional antenna
ACC-10314-02 NETGEAR 3m RF feeder
Conclusion: Because of its advantages of being independent of the environment, flexible and convenient, not affecting the original decoration layout, and short network construction period, wireless local area network (WLAN), compared with traditional wired access methods, wireless local area network can not only realize many new The application can overcome the inconvenience caused by cable restrictions, and truly make the network everywhere, becoming one of the most suitable networking methods for multimedia classrooms in primary and secondary schools in major cities. As a pioneer and leader in the global network of small and medium-sized enterprises, American Netgear has been committed to network technology innovation. Adhering to the concept of equal emphasis on technology and application, it provides users around the world with easy-to-use, high-performance and cost-effective network solutions, and reliable and proven product quality provides the greatest guarantee for the long-term high reliability and stable operation of the equipment.
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