User background
Tsinghua University was founded in 1911. The park covers an area of ​​356 hectares and has a construction area of ​​1.68 million square meters. The buildings of different periods naturally form different types of architectural communities, creating a suitable working, learning and living environment for teachers and students. As a famous comprehensive higher education institution in China, Tsinghua University has a long history of more than 90 years. Tsinghua University has a large number of teaching buildings, dormitory buildings, libraries and other infrastructure, and related living support facilities such as hospitals, gymnasiums, and supermarkets are also relatively complete.
User needs
In a large campus of Tsinghua University, the mobility of teachers and students is very strong, and it is easy to gather people in some places to form a "public place". And with the popularity of notebooks and the increasing demand for Internet access over the past few years, both teachers and students are eager to surf the Internet and carry out online teaching interactive activities in these places. Mobility and frequent interchangeability make wired networks unable to flexibly meet their network requirements, causing network interconnection and Internet access bottlenecks. Recently, Tsinghua University has just built the sixth teaching building, which is divided into blocks A, B and C, of ​​which C is five floors, and blocks A and B are four floors with an area of ​​nearly 20,000 square meters. This teaching building is a typical " Public places". Must meet the mobility needs of Tsinghua teachers and students.
In addition, on the campus of Tsinghua University, there are many monumental classical buildings such as the Great Hall and Ancient Moon Hall that have been deposited over 90 years. Due to the ages of these buildings, none of them can realize the information education based on the wired network platform. In view of the history and commemorative significance of these buildings, it is inconvenient to renovate and overhaul them. This puts forward new topics and problems for the network informatization of Tsinghua University, which can not only destroy the overall style of classical architecture, but also realize the informationization "5A" standard.
The wired network appears pale and weak in front of the above-mentioned problems, and solving the above-mentioned problems through the wireless local area network solution makes people deeply feel that "the village will be full of flowers." The development of wireless network to this day, although it can not replace the wired network, but as an extension and supplement of the wired network, it is a good way. The characteristics of flexibility, expandability, mobility and easy installation of wireless local area network are reflected in the construction of "public places" and the information network of ancient buildings.
Technical solutions
In fact, Tsinghua University started to pay attention to wireless local area network very early. As early as 1998, it had the idea of ​​constructing wireless local area network. However, it was constrained by the technical factors of wireless local area network at that time, such as narrow bandwidth (only 2M or even lower), low security and high installation cost, which failed to be implemented on a large scale. In 1999, the IEEE802.11b standard was introduced to enable the transmission rate to reach 11Mbps, 128-bit encryption can be safely implemented, MAC address filtering, etc. Tsinghua University also made small-scale attempts in libraries and other places, but because the bandwidth is only 11Mbps , A bottleneck will occur during relatively concentrated use, so no large-scale implementation. In 2001, the IEEE802.11a standard was introduced with a bandwidth of 54M. However, due to its high cost and incomplete technology, it has not been widely used in the wireless LAN market. Tsinghua University has only conducted basic research and testing on related products.
In 2003, the introduction of the IEEE802.11g standard was the most ideal choice for Tsinghua University. The 54M bandwidth allows users to transmit not only ordinary data packets, but also multimedia files such as video and audio, laying the foundation for the deep application of wireless LANs; WPA security technology has further developed to provide security assurance for open networks; the backward compatibility feature enables People's previous investment in 802.11b products will not be wasted; low prices, outstanding cost performance and other advantages have made 802.11g products recognized by Tsinghua University.
Tsinghua University decided to use IEEE802.11g products for large-scale applications, so all the newly constructed sixth teaching buildings and ancient buildings used 802.11g standard wireless network solutions.
After comparing the 802.11g wireless products in the market, Tsinghua University found that NETGEAR occupies an absolute leading position in this field. Whether it is product quality or cost performance, it is far more than similar products. And as the earliest and only manufacturer to promote the full range of 802.11g products and complete solutions in China, it has long-term practical application experience.
In response to the application requirements and site surveys put forward by Tsinghua University, Netgear conducted in-depth and meticulous investigation and careful planning and design of the complex terrain and multi-application teaching environment, and designed a set of secure and stable 802.11g for Tsinghua University Wireless network solution.
Tsinghua University's wireless access point uses WG602 of American Netgear, and its wireless network card selects WG511. The teaching building is a four-story building. One WG602 is placed in ordinary classrooms, and two WG602 are placed in large classrooms. In order to achieve better coverage, WG602 access points are also placed in the corridors, and wireless coverage is provided in all places to eliminate The creation of "dead spots". The entire project used 130 sets of WG602 wireless access points and 150 WG511 wireless network cards.
Because the wireless access point is placed on the ceiling of the classroom, and there is no corresponding power supply facility at this location, so the way of power over Ethernet is adopted to provide WG602 with the required power through Ethernet. Therefore, the US Netgear Ethernet power supply module was selected to supply power to the wireless access point WG602, and a total of 130 sets of Ethernet remote power supply components were used.
Each WG602 wireless AP is connected to the aggregation switch in the wiring closet through Ethernet. The entire project not only covers all floors wirelessly, but also connects to the Tsinghua University campus network through a wired Ethernet aggregation switch. It enables the teachers and students in the new teaching building to share all the information on the campus network and access the Internet through the broadband exit of the campus. In order to ensure the speed of the wireless network, Tsinghua University adopts the method of arranging multiple access points to achieve high-density coverage, so that different data, video and audio files can be transmitted at high speed across the entire network.
Application effect
The 802.11g standard wireless network project of the sixth teaching building of Tsinghua University was completed in October 2003. Through the recent operation, the entire system is stable.
Due to the use of the 802.11g standard and the 54M theoretical bandwidth as a guarantee, the actual peak bandwidth is close to the ideal level. The teachers and students of Tsinghua University are very satisfied with the excellent product performance and high-speed output throughput.
After the completion of this wireless network project, anywhere in the sixth teaching building, Tsinghua students can easily achieve 54M high-speed wireless networking at any time. Tsinghua students first enjoyed the latest wireless LAN technology.
NETGEAR ’s high-speed, flexible, and easy-to-use wireless network solutions have brought more modern information networks to the students of Tsinghua University.
Netgear
Netgear uses advanced and mature wireless overall solutions combined with the existing network environment to provide users with a multi-layered, cost-effective solution, effectively protecting the user's existing environment, and building it for users simply and efficiently A high-performance network architecture.
1. Realize the availability, reliability and high network security of enterprise-level wireless networks:
WG602 provides a transmission rate of 54M, providing the network bandwidth required by mobile network users in the area to access resources. A variety of highly reliable security features effectively prevent data from being stolen during transmission. Provide maximum convenience for users to build a secure network.
2. Friendly web interface and installation assistant greatly simplify network configuration:
WG602 graphical configuration interface and configuration help simplify the installation, configuration and management of non-professional users.
3. Reduce investment costs and management costs and easily expand flexibly
Compared with the wired network, the use of Netgear's cost-effective 802.11g wireless network solution can put aside all the shackles during the construction process and provide a professional solution when it is impossible to implement wiring. The low price makes NETGEAR wireless products comparable to wired networks and easy to expand.
4. The latest wireless LAN standard-IEEE 802.11g 54Mbps wireless LAN
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