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 TECHNOLOGY OVERVIEWThree technology solutions have evolved to address mobility in the workplace: licensed, unlicensed and converged voice and data. Within the Unlicensed Voice Only Segment, products operate on either the 900 MHz or Unlicensed PCS band. Unlicensed Licensed Converged Voice & Data UNLICENSED VOICE ONLY900 MHz, 902-928 MHz The 902-928 MHz band is one of three frequency bands reserved for the use of industrial, scientific and medical (ISM) devices. ISM devices are used for military radar, medical and scientific instruments involving the generation of heat, mechanical vibrations, or ionization of gases. Communication equipment that operates in this band is limited to 1 watt of transmit power and must comply with Part 15 of the Code of Federal Regulations (CFR), which states that unlicensed users can not cause interference to license users and must accept interference from them. Due to their low power and use of spread spectrum technology, ISM band wireless in-building systems are unlikely to interfere with other ISM devices. Products in unlicensed bands do not incur monthly service fees or air-time charges. Products in this technology include:
Unlicensed PCS - 1920-1930 MHz The FCC designed 20 MHz of spectrum within the larger licensed PCS band for unlicensed in-building applications. This band is further divided into voice (1920-1930 MHz) and data (1910-1920) applications. Products in this band must comply with Part 15 of the CFR; U-PCS devices must monitor and find unused spectrum before transmitting. In-building wireless telephone systems must receive FCC approval before they can operate in the U-PCS spectrum. Products in this band incur no monthly service fees or air-time charges. Products in this technology include:
LICENSED PRODUCTSPCS - 1850-1910; 1930-1990 MHz; Cellular - 824-894MHz In-building wireless systems that operate in the licensed frequency bands use the licensed frequencies of wireless carriers. One of the advantages to this technology is the ability to use the same handset in and out of the building. Businesses that purchase this type of product usually pay a monthly fee per user to licensed carriers. Products in this technology include:
CONVERGED VOICE & DATA2.4GHz - 2.4000GHz - 2.4835GHz The newest segment in the in-building wireless market is converged voice & data. Symbol Technologies and SpectraLink both offer IEEE 802.11 standards-based wireless LAN telephone systems which combine voice and data traffic over the same wireless infrastructure. Symbol's NetVision products works on their own Spectrum24 wireless LAN access points where as Spectralink's NetLink Product works on their technology partners' access points. SpectraLink's technology partners include(Cisco, Agere Systems, BreezeCom, Intermec, Enterasys Networks, Proxim and Psion). Products in this technology include:
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