Wired and wireless integrated access scheme

Wired Wireless integrated access scheme for wireless Controller plus Fit AP Most typical applications, wireless controller as the center of Wireless Data Control and forwarding, placed in the center of the network room, wireless access points to the Office Building Corridor or conference room, and so on, Fit AP and Wireless controller can be in the same network segment, can also not be the same network segment, between them through the CAPWAP protocol to automatically establish a tunnel (the tunnel based on UDP, can traverse the three-layer network), combined with the access function of the Ethernet switch, so it is very easy to deploy enterprise-class wired wireless integrated access scheme. From the user management point of view, with the Intelligent Management Center, can be wired devices and wireless equipment Unified network management, wired users and wireless users unified authentication platform, so that the real realization of wired and wireless integration.

Wireless Adoption 802.11 technical advantages

Wireless networking technology is based on the IEEE802.11 standard (the International standard for wireless networks), which mainly defines the physical layer and Access layer (MAC) of the network, where the MAC layer is the focus. Below the MAC layer, 802.11 specifies three transmit and receive technologies: Spread spectrum (Spread Spectrum) technology, Infrared (infared) technology, narrowband (Narrow Band) technology. And spread spectrum is divided into direct sequence (direct SEQUENCE,DS) spread spectrum and frequency hopping (Frequeny hopping,fh) spread spectrum two kinds.

There are three key technologies to realize WLAN: infrared, frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS).

Infrared LAN uses less than 1μm wavelength of infrared as the transmission medium, has a strong directivity, by the interference of the sun is large. Infrared supports 1~2MB/S data rates and is suitable for near-distance communication.

The Dsss LAN is capable of communicating over a wide frequency range, supporting 1~2MB/S data rates, which are narrowband in both the sending and receiving sides, while transmitting in a wideband manner.

FHSS LAN Support 1MB/S data rate, a total of 22 sets of frequency hopping pattern, including 79 channels, the output of the synchronous carrier after mediation, can be sent to send the message.

DSSS and FHSS Wireless LAN both use radio waves as media, coverage is large, transmitting power is lower than the natural background noise, basically avoid the signal eavesdropping and stealing, making communication very safe. At the same time, radio waves in the WLAN will not cause harm to human health, and have the advantages of anti-jamming, anti-noise, anti-attenuation and good secrecy.

We know that the spread spectrum technology is using the open 2.4GHz Band, because this is a common frequency band, so very crowded, microwave noise is the largest, and what kind of transmission and reception methods, will directly affect the quality and speed of microwave transmission. The direct sequence spread spectrum technique uses the whole frequency band simultaneously, the signal is extended multiple times without loss, while the frequency hopping spread spectrum technology is the continuous intermittent jump uses multiple frequency points. When jumping to a frequency point, determine if there is interference, if none, then transmit the signal, if any, the algorithm jumps to the next frequency band to continue to judge. It is because of the use of frequency hopping technology, so that the range of frequency hopping is very wide, but the information at each frequency to stay in a short time (only 1/1000 seconds or so), not only make the data anti-jamming ability greatly improved, and transmission more stable, improve the security of data, this is the key to wireless network transmission. Of course, there are other important elements in IEEE802.11, such as CSMA/CA protocol, rts/cts protocol, envelope reorganization, multi-channel roaming, etc.

Characteristics of wireless network reliability scheme

The best advantage of the FIT AP Network is the 0 configuration of the AP itself, which automatically downloads the software version and configuration file from the wireless controller when the AP is powered on, while the wireless controller automatically adjusts the operating channel and transmit power of the AP. In addition, the wireless controller's RF scanning detection hotspot Region Rouge AP, can timely eliminate the interference of other APs, to ensure the stable operation of the AP. In the network management, the management can only manage the wireless controller device can achieve the effect of control AP, greatly reducing the post-wireless network maintenance and management of the workload.

When using a wireless controller to +fit an AP, the AP automatically obtains the IP address via DHCP after booting and automatically searches for the associated wireless controller, which automatically downloads the configuration file and updates the software version from the wireless controller after the Capwap tunnel is established with the wireless controller.

In the AP access, when an AP fails, the surrounding other APS will automatically adjust the power, the part of the area to re-signal coverage, to ensure good signal coverage. When an illegal AP enters the wireless network to cause signal interference, the H3C only the RF management system can locate the location of the AP, in order to be eliminated in time.

This article is from the "Hangzhou Good Jackpot Company" blog, please be sure to keep this source http://hctpj.blog.51cto.com/9774914/1596195

Wired and wireless integrated access scheme