Wireless networking

Wireless technologies are intended for the organisation of office LANs, qualitative backbone channels and an effective 'last mile' and are used in corporate and operator networks.

Their advantage over wire communication lines:
the opportunity to organize a communications channel regardless of the presence and quality of a cable infrastructure, and the opportunity to change connection points quickly without a cable lining and other essential expenses.

The advantage over satellite communications channels:
no significant expenses for rent of a satellite channel resource.


Wireless backbone


The main communications channels provide high quality information transfer at high speed and are essentially constructed on the basis of microwave communication lines. Recent perfection of microwave equipment has significantly improved the "price-quality" ratio, making even high-end systems accessible to the corporate market. Modern microwave equipment provides communications channels between the units carried at distances up to 50 km, with speeds from 4 Mbps up to 311 Mbps, and gives various interfaces (E1, Fast Ethernet, STM-1, etc.) and their combinations.

A restriction when using backbone communication lines is the need to maintain line of sight between antennas, which frequently means they have to be installed on high-altitude constructions and can lead to additional expenses.

Wireless “last mile”


Wireless "last mile" is called in to solve the very serious problem of a shortage of communication channels in cities and suburbs. "Last mile" wireless systems differ from a wireless backbone in that they offer an opportunity to connect a unit with one to several dozen terminals, with reduced material costs and less demand on users’ stations installation and, usually, reduced throughput.

"Last mile" wireless systems are characterized by speeds of ten megabits per second, up to several hundred user stations, range of communication up to 30-50 km, and functionality in line-of-sight and non line-of-sight conditions.

The most promising “last mile” technology is a WiMAX.

Wireless LANs (Wi-Fi)


Construction of intraoffice wireless LANs increase the overall performance of employees and make the creation of workgroups easier, due to the increased flexibility and mobility of employees. Wireless LANs allow the user access to network resources at a speed up to 54 megabits per second, to not lose network connection at any point within the office, to have an identical network environment and access rights at any point in the office, and to use mobile Wi-Fi-telephony.

During installation of wireless LANs, special care is given to broadcasted traffic safety.

Hot-Spots


Installation of non-corporate intraoffice wireless LANs usually aims to give commercial or free-of-charge wireless access to information resources for guests, visitors and clients. In such networks it is necessary to supervise and operate access to resources and connection to a network. Such problems are solved by special hardware-software combinations consisting of a wireless system and a management and control system. In such systems, access to a wireless network and information resources is available only to authorised users during a certain period of time and at a certain speed.