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• <br /> • <br /> H. TECHNICAL OVERVIEW <br /> toBackground <br /> This section provides a technical overview of the cellular, Enhanced Specialized Mobile Radio <br /> (ESMR), and personal communications services (PCS) technologies. The following table lists <br /> examples of current providers licensed by the Federal Communications Commission in the San <br /> Diego region. <br /> Table 1 <br /> EXAMPLES OF PROVIDERS IN SAN DIEGO REGION <br /> [ , <br /> Cellular AirTouch and GTE Mobilnet <br /> Enhanced Specialized Mobile Radio(ESMR) Nextel Communications <br /> Personal Communications Systems (PCS) Pacific Bell Mobile Services <br /> and Cox Communications <br /> It should be emphasized that although the three technologies discussed in this section currently <br /> III function in slightly different manners, they will offer similar services in the future. In fact, all of <br /> these technologies are based on systems composed of interconnecting cell sites. With this common <br /> cell site base, it is predicted that as these technologies evolve, they will become more and more <br /> similar. For example, a transition to smaller cell sites and the use of more antennas per square mile <br /> are expected. For a comparison of the services that each of these technologies offers, as well as a <br /> listing of carriers in the San Diego region, please see Table 2. <br /> Technology <br /> Wireless communications are transmitted through the air via radio waves of various frequencies. <br /> Radio-frequency-radiation-(RFR)-is-one-of-sev . • . r a .c-radiation. As illustrated <br /> in Figure 1, cellular and ESMR operate at frequencies between 800 and 900 MHz, and PCS <br /> operates at both 900 MHz as well as between 1,850 and 2,200 MHz. <br /> S <br /> 9 <br />