Campus wireless network construction plan

Campus wireless network construction program.rar

Campus wireless network is a seamless wireless communication network established by Wireless Local Area Network (WLAN) technology, so that every corner of the campus is in the wireless network, forming a fully covered campus network.

At present, most units already have a wired network, but they can only provide fixed and limited network information points, which cannot meet the needs of users to share network resources anytime and anywhere. The campus wireless network is in line with the advancement of social informatization and has developed vigorously.

The biggest feature of the campus wireless network is its high degree of spatial freedom and flexibility; it can avoid large-scale laying of network cables and investment in fixed equipment, effectively reducing the cost of network construction and greatly shortening the construction period; the wireless LAN bandwidth is very wide, It is suitable for a large number of bidirectional and multidirectional multimedia information transmission. Through the construction of campus wireless network, we can find the foundation and solution.

Design Principles

Realize the principle of unified wired and wireless authentication, unified management, and safe and reliable.

1. Unified management with rich functions

Wireless access points are often distributed on the ceilings, walls and roofs of various buildings. It is usually difficult to directly observe the working status of the equipment. This requires that the wireless network must adopt a centralized management method to monitor and control the entire network equipment in real time. Management, including the monitoring and management of the working status and configuration parameters of wireless devices throughout the network, radio frequency environment monitoring, network link status monitoring, positioning of wireless users and devices, radio frequency intelligent control, alarms, and rich report output.

2. Follow the standard

The technical support adopted by the wireless local area network should be an international standard or an industry standard, without using a manufacturer's special technology and protocol to ensure the interoperability of network equipment, which is conducive to investment protection of the network.

3. Centralized management + distributed forwarding network structure

The first-generation wireless LAN mainly uses a fat AP architecture. Each AP is an independent individual. There is no communication between the AP and the AP. It needs to be configured and managed one by one, which is time-consuming, laborious, and expensive to maintain. , Low security, poor integration.

The second-generation wireless LAN is integrated into the authentication gateway device. It still cannot centrally manage and configure the AP, but only improves the authentication management.

The third-generation wireless LAN architecture uses a structure of wireless switches and thin APs, which greatly improves the network performance, network management, and security management capabilities of wireless LANs, making it possible to build large-scale wireless networks. However, with the increase of wireless data traffic, wireless switches are not only easy to become the bottleneck of data transmission, but also prone to single points of failure. Adding wireless switches will undoubtedly greatly increase the cost of networking.

The fourth-generation wireless LAN architecture uses a wireless controller plus smart AP architecture. The fourth-generation fat and thin intelligent AP can accept centralized management and configuration, and can directly forward data locally, successfully avoiding the existence of the third-generation wireless LAN. Problem has become an inevitable development of wireless LAN.

4. Safety and reliability

In terms of network security, the wireless local area network system must have the same security protection measures as the wired local area network. The security of the wireless network is mainly considered from the following aspects:

Access authentication: with support for multiple user authentication methods;

Full encryption of the data link;

With radio wave monitoring capability, it can provide wireless intrusion detection and wireless terminal location tracking.

The main aspects of reliability are: it has the ability to provide intelligent automatic control and switching of radio waves to ensure that a single AP access point automatically switches to a neighboring AP in the event of a failure, and does not affect wireless access services; it has hot backup support Redundancy backup mechanism of wireless controller.

5. Wireless business roaming

Wireless network users should be able to experience and use the existing services of the wired network, and ensure that the services are not interrupted on the premise of ensuring user mobility.

Overall design

1. Wireless application example diagram

2. Design features

Perfect smart antenna technology

The antenna of the AP is a smart antenna matrix system composed of multiple horizontal and vertical polarized antennas, which can provide 4095 antenna modes. The system control software uses the feedback mechanism built in the 802.1MAC layer protocol to continuously adjust for each receiving device Antenna mode. By selecting an optimized antenna array for each receiving device, BeamFlex can expand wireless coverage and higher communication speed.

In a two-story room with more than 400 square meters with multiple rooms and partitions (including load-bearing and non-bearing walls), it can provide a stable data flow of 15-20M.

This technology will greatly reduce the number of APs deployed by users in hot spots and save users' investment.

Intelligent QoS technology

The patented SmartCast technology includes multicast traffic processing technology, intelligent QoS, and the ability to automatically classify traffic based on "identifying applications." SmartCast's intelligent fuzzy control technology can automatically identify and distinguish traffic types from all traffic, and automatically mark service types for different types of traffic.

An AP can support 3-4 concurrent MPEG-2 or 1-2 10MHD video streams (at a distance of 20 meters, including background traffic).

Strong anti-interference ability

The smart antenna system can reconfigure and adjust itself in real time by detecting radio frequency and multipath problems and interference caused by neighboring network noise, so that the AP can immediately select the most from a variety of different quality signal transmission paths in a constantly changing environment. Excellent transmission path.

In the office building, due to the large number of APs, there are multiple APs on each channel, so it is impossible to solve the interference problem through frequency hopping, and do not want to reduce the coverage due to the reduction of power. Smart wireless APs can avoid this by changing the transmission path. Open interference to ensure the reliable transmission of data. As shown in the figure below, the AP avoids mobile phone interference by changing the transmission path.

By changing the transmission path, the AP effectively covers the area behind the load-bearing wall.

High user density

A single AP can support more than 50 (2942) or 100 (7942) user access at the same time, it is currently the AP that can support the most users. Simple coverage is a shortcoming when the user access density is high. Because the user will find that he sees the AP's signal is good, but can not connect. Will cause a lot of complaints and reduce user experience.

Simple and convenient installation and deployment

The new AP can automatically discover the AC or centralized management system, automatically update the software version and initialize the configuration. The installer does not need to check the version and configuration of the AP that needs to be installed or replaced, and does not need on-site debugging and testing. The unification of versions in a network is very important. If the versions are not unified, the working status of the devices is different, which will cause considerable troubles for maintenance and management.

BeamFlex technology has no special requirements for the installation location of the AP, and can be installed in a convenient installation (such as almost anywhere with an Ethernet interface). This not only facilitates installation, but also saves installation costs.

In addition, the built-in MESH technology can be extended to cover areas where wiring is inconvenient.

Predictable network performance

The biggest difference between wireless and wired is that the uncertainty is very large, and this is also the difficulty of wireless network maintenance and operation. BeamFlex smart antenna technology and SmartCast technology make it possible to predict AP performance. Greatly reduce the cost of maintenance and operation, and increase the user experience.

Real-time monitoring of wireless RF environment

You can see the wireless spectrum distribution of the AP in real time. It is very helpful to diagnose and solve some intermittent performance instability problems.

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