Wireless data solution

The OS-Gemini system claims a success rate of more than 99% and has data rates up to 3 km in length. Maximum data rate is 33.6 Mbps on less obscured sites. The system radiates multiple beams from the antenna - the effect of which is to significantly protect against fading and to radically increase the probability that the receiver will decode a usable signal.

A powerful transmitter combined with a super-sensitive receiver delivers a 155 dB (with 4 W EIRP) system gain.

Orthogonal frequency division modulation (OFDM) is a recognised method of reducing interference caused by signals that take multiple paths arriving out of phase at the receiver. This system takes this technology further by using more sub-carriers and pilot tones, handling multipath dispersion and providing instant fade recovery.

At power-up and during operation, the system scans the whole band and automatically switches to the clearest channel. This is 'licensed band interference-free performance in an unlicensed band'. The highest sustainable data rate is negotiated by the transmitter and receiver. The rate is then dynamically upshifted or downshifted as conditions change. It always provides the maximum performance possible within the current power limits.

It automatically selects the clearest channel, modulation scheme and transmit power for the link. A link comprises two outdoor units and two indoor units. Large antenna beamwidth simplifies the initial connection and an audio tone assists the installer to optimise link alignment. The indoor unit (about the size of a pocket dictionary) connects to power and a LAN. The small outdoor unit is a neutral colour, making it suitable for aesthetically restrictive areas.