Business Development, Strategy Alignment and Consulting News from The Business City London -

	Radio Communication
	Radio communication is quite an interesting area as networks free of cable binderies are as alternative to leased/nailed lines or dial on demand connections. This kind of connection to the WWW offers new possibilities for frequent surfers and big companies. To use these new technologies only within a LAN would only be a waste of the potentials offered by this medium.
	In Theory: Even if there were many wireless services on offer the application of Spread Spectrum within the ISM band (Industrial Scientific Medical) would be preferred. One distinguishes between FREQUENCY HOPPING SPREAD SPECTRUM (FHSS) and DIRECT SEQUENCE SPREAD SPECTRUM (DSSS). Both services are widely on offer with today's products.
	FHSS: Sender and Receiver agree to a random sequence by which the data transmission is done by hopping through the 80 channels. If one channel is disturbed it will not affect the transmission as the change to the next channel is done within 8ms (WIMAN). This prevents buggers from catching valuable information for misuse. You can of course use several stations at the same time with a different hopping matrix.
	DSSS: Here, the transmitting stations use the complete bandwidth of ISM (2,4 - 2,483 GHz). Before transmission begins each data-bit is randomly encrypted. In order to be able to receive the data the station at the receiving end needs to have the appropriate key. As each station uses a different key it is possible to use several stations at the same time.

	Band width: Today's radio systems are able to use speeds of up to 115,2Kbit (some reach even up to Mbit). High Band width is in reality a very critical business as a missing line of sight can make it impossible to provide good transmission quality.
	Standards: So that systems made by different companies are able to communicate with each other they must comply by the Wireless LAN Standard 802.11.
	Range: The range of the offered wireless systems will differ between Indoor versions and systems capable to connects offices and buildings. Some are capable of connecting over a distance of 2 km. In some cases buildings can be connected by Wireless Bridges or Access Points using Point to Point Connections. Special antennas are used for this kind of installation.
	Besides the well known systems there is the WIMAN made by Altvater Airdata which uses Point to MultiPoint. The WIMAN Star gadget monitors up to15 WIMAN Access Stations which are synchronised with other WIMAN Networks. The monitoring is fully done by the WIMAN Star. Up to 40 WIMAN Networks can be run simultaneously.