| In response to the increasingly complex RF coverage requirements found within large buildings such as airports, shopping malls and stadiums, wireless technology group, Radio Frequency Systems (RFS), Germany, a global designer and manufacturer of cable and antenna systems plus active and passive RF conditioning modules, has recently developed a fully modular and scaleable in-building RF solution set.
The new RFS �high-end in-building solution� provides a reliable and cost-effective means of realising multi-carrier/multi-band RF coverage within larger public buildings. The product set is a unique mix of passive and active technologies that accommodate a global range of cellular frequency bands. This includes TETRA 380, CDMA 800, GSM 900, GSM 1800 and UMTS, with PCS 1900 to be added in mid-2003. �By using passive broadband distribution and combining technology, the new RFS high-end in-building solution permits co-located RF operators to actually share the in-building RF infrastructure within the premise. The benefits are two-fold: substantial installation cost savings for in-building operators, plus the ongoing system reliability advantages of a largely passive RF system�, explained Dr Peter Raabe, RFS Global Product Manager
The system is founded on a selection of RF multi-channel combining systems in both band-specific (MCC series) and broadband (BBC series) options, coupled with RFS�s �Radiaflex� broadband radiating cable range and point source antennas. To reach remote sites on the larger campuses, RFS complements this with a complete rack-based fibre optic transmit/receive system; plus a range of high-performance, low-noise modular amplifiers (I-RFU series) for remote site re-amplification of each RF signal. The I-RFU remote site amplifiers are purpose-built to support multi-carrier/multi-band systems. The modular amplifiers are high-end, high-amplification units designed to meet the stringent European inter-modulation requirements. The units provide 20 to 50dB up-link and down-link gain in 2dB steps, and can typically support passive RF system coverage of areas between 50,000 and 80,000m2.
The MCC series supports up to four carriers per frequency band, while the BBC series can combine up to four separate frequency bands from 380 to 2,200MHz. Used in combination, this permits a total of 16 carriers to be driven into a single broadband passive distribution system.
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