Application background
Tai'an Second Middle School is a key middle school in Shandong Province and a model of quality education in Tai'an City and even Shandong Province.
The school started informatization education earlier, with a multimedia classroom and a simple network center, located in the same building. With the continuous improvement of computer application level and the demand for computer teaching in middle schools, the existing network can no longer meet the needs of use. In 2002, the school built a new audio-visual building, ready to re-plan the campus network, establish a complete campus network, and achieve long-distance information exchange and resource sharing through the interconnection with the wide area network to expand the horizon of teachers and students. Cultivate students' creative thinking, improve their ability to acquire information, analyze information, process information and adapt to modern society.
System construction goals
The newly established audio-visual building is the core of the entire campus network and the information management and control center of the entire digital campus. It is necessary to establish some teacher offices, teacher preparation rooms, laboratories, and astronomical observatories here. A total of 11 multimedia classrooms, each There are 65 student computers in each classroom, and 120 information access points in other offices. In order to enrich the extracurricular life of teachers and students, the school's video-on-demand system is also set up here. In order to provide a venue for information exchange and a window for external publicity, a campus website must also be established here. To realize the informatization of education, we must realize the informatization of school office and the informatization of teaching. The school affairs management system, courseware making system and Internet teaching system are implemented in the office building and teaching building respectively. Establish an electronic reading room to facilitate management, learning and enrich knowledge resources. In order to maximize the sharing of resources and broaden the horizon of teachers and students to the whole world, it is also necessary to realize the interconnection between these buildings and connect them to the education metropolitan area network and the Internet through the direct connection of switching fibers. The system adopts a two-level structure of a backbone network and a subnet. The entire network uses a gigabit backbone and 100M to the desktop.
Implementation Introduction
System construction principles
Taking into account the system scale and application requirements of Taian No.2, it puts forward high requirements for the availability, stability, security, scalability, and manageability of the system. The construction principles of the system are as follows:
1. High availability. Due to the large scale of the system, high requirements are placed on its availability. For example, under the high load of data query and video on demand, the requirements for network bandwidth, server CPU, memory, and I / O are very high. This requires that the server must have extremely high availability, which can meet the stringent requirements of these complex applications. The hardware products provided by manufacturers are required to have strict quality assurance and good service capabilities and service systems.
2. safety. The security of the system mainly depends on the security of the physical equipment and the security of the network. Since a large amount of teaching courseware, teacher-student files, and important office information of the school are stored on the server, as the core device of the system, the server itself must be able to ensure the security of its data and provide stable and reliable services. In order to improve the security of the internal network and facilitate management, it is necessary to adopt a virtual network design scheme and set different permissions for different users to access. In order to prevent virus infection and illegal intrusion, and ensure the security of the network. Need to use high-performance broadband network access server designed for campus network, use transparent proxy, cache, firewall, historical records and other functions to perform hardware-based filtering to ensure network security.
3. Scalability. The system needs to adapt to the various stages of campus network construction, but also to meet the needs of low-cost expansion and upgrade due to technological development needs. And can meet the future development needs of distance education; has a good resource expansion and compatibility. At the same time, in the process of application, the school can continue to add and improve resources through the means provided by each product to establish a sustainable campus network.
4. Manageability. The campus network is relatively large, and the servers are all over the buildings, and its own is relatively complicated. This requires that it must have strong manageability. The server manufacturers usually provide powerful server management software to monitor the running status of each server component and system in real time. When a problem occurs, it is automatically corrected and the manager is alerted, and the problem is recorded, and the manager checks and manages the system through it.
5. The participation plan provided by the manufacturer can reasonably plan, design and configure the entire campus network for easy management.
Equipment selection is based on the construction principles of the above system, considering the user's network application environment, application scale and other factors. Tai'an Second Middle School strictly selects all hardware products. After testing and comparing multiple products, Inspur chose Education-specific PCs, servers and Cisco switches, on the basis of meeting system applications, they have a good guarantee in terms of system availability, scalability, security and management. As the earliest domestic manufacturer that has passed ISO9001 and ISO14001 dual certification, the quality of Inspur server and PC is strictly guaranteed. Inspur's campus network solutions specifically for the education industry have been applied in many campus networks, have a good user base, and can provide self-developed network management system software with its own intellectual property rights. Inspur, Cisco's hardware provision capabilities, service capabilities, technical support capabilities, and understanding of applications are the highlights of this device selection.
System network topology
The system adopts a two-level structure of a backbone network and a subnet. The entire network uses a gigabit backbone and 100M to the desktop. The advantages of multimedia teaching can be exerted to the fullest. Even if more users want to join the video on demand application, the network bandwidth will not become a bottleneck. The transmission media of the backbone network between the audio-visual building (network center) and the other three buildings all use optical fiber, and select Gigabit Ethernet technology for networking. The network center is connected to the sub-nodes in each building with optical fiber, and then connected to each user through the switch of the sub-node in each building. For buildings with a large number of users, the switch uses the switch Gigabit stacking technology. This Gigabit Ethernet solution has the advantages of low cost, good interconnectivity, easy upgrade, simple networking, many technical support manufacturers, and rapid technological development.
The network topology of the system is as follows:
System operation effect
During the implementation of the Taian No. 2 Middle School Project, it was implemented in accordance with the project management responsibility, including the five-in-one mode of hardware (server, desktop), network, software, training and funding. Completed, and to ensure that the school can be fully used, it also maximizes the protection of the user's previous investment, effectively saving engineering costs. The stable operation of the system greatly facilitates the management, office and teaching of Tai'an Second Middle School and improves work efficiency. The electronic reading room and video-on-demand system enrich the extracurricular life of teachers and students. The use of modern technical equipment and multimedia teaching methods to visually explain teaching can enhance students 'interest in learning and understanding, and provide content that is much broader than book knowledge, expand students' contact with the outside world, and broaden their horizons. Enhance communication and improve the quality of teaching and students, and promote the improvement of education.
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