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With the increasing importance of wireless networks in the corporate, educational and hospitality world and the proliferation of WiFi infrastructure to service these demands, it has become even more important that the network administrator has the tools at hand to quickly manage, configure and generally administer the various elements of the network. At its most basic this might be simply to change the SSID of one particular access point (AP) or, at the other end of the scale, it might be to en-mass administer a firmware update; the ability to centrally control and manage all elements of the WiFi network is now a vital tool for any system where there is a large, distributed wireless infrastructure.
The basic elements of any managed wireless system is a collection of distributed access points (APs) which connect through wired network connections to the access controller (AC). The access controller is the device or server which facilitates control functions of the APs. The AC unit can take the form of a stand alone controller, a WLAN switch, or even a computer/software implementation. Although a wired network would be the norm for control connectivity to the access points, it is also possible to use a secondary wireless infrastructure for the data connectivity.
Fat, Thin, and Fit APs
In a managed WiFi network, consisting of multiple access points and the access controller, the level of data control and management the AC has to furnish depends upon the level of autonomous operation the APs have. Continue reading…
The Hull and East Riding of Yorkshire Caravan Manufacturers’ Association runs The Lawns Caravan Show every September, to introduce the new season’s caravans. The Lawns Show in Cottingham, near Hull, generally features more than 130 new touring caravans and about 150 caravan holiday-homes, lodges and park homes from most of the major British manufacturers. Following the Extravaganza there is a trade only event. The show attracts about 3,500 visitors from throughout the UK, and many parts of Europe and Scandinavia – and sometimes even further afield.
The 3G and 4G mobile network platforms provide a way of providing high-speed internet access to mobile devices like smart phones or dedicated 3G/4G products and is a convenient way of accessing the internet where there is no available presence of a broadband line.
The main discernible differences between 3G and 4G (LTE) are the speeds of data transmissions from a device to the network mast (and the resulting reply) and also the way in how 3G and 4G signals are transmitted.
3G is single stream and 4G (LTE) is dual stream which means that two signals are sent out and two signals are expected to be received.
This is what ultimately gives 4G the edge in speed over the data transfer of 3G signals as more data can be sent in a single transmission. Continue reading…
Wireless networking typically uses the unlicensed 2.4-2.5GHz or, more recently, 5.1-5.8GHz frequency band though the 2.4GHz is still the most popular form of radio based networking. The range of kit is massive with many hundreds of competitive kit available from simple USB cards for notebook computers up to powerful bridging units designed to link buildings.
Before the 802.11b protocol appeared in 1999, LAN networking meant you had to be physically connected via a cable. The family of 802.11 protocols are made up of an arrangement of over-the-air modulation techniques that use the same basic principles. The most widely used protocols are the 802.11b, 802.11g and 802.11n for 2.4GHz networks and the 802.11a, 802.11n and 802.11ac for 5GHz networks.
802.11 Operating Modes
Infrastructure Mode is used when there is at least one Wireless Access Point and client. The client connects to the network through the Access Point. So, for two clients to talk to each other they do so by routing through the access point. Continue reading…