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<br />El Camino Real Traffic ~.¿nal System City of Redwood City <br />Cost with respect to the other interconnect schemes <br />Cost associated with future expansion <br />Data versus video and voice transmission <br />Table 1 presents an evaluation summary of a recent project. <br />In addition, wireless communication can be explored in detail and at a minimum, the basis characteristics of <br />spread spectrum and 900 MHz licensed radio and microwave technologies will be compared for their <br />applicability for this corridor. <br />Spread spectrum technology is now being used as an alternative to hardwire data <br />communications. The technology is increasingly being used for data, voice and video <br />communications, particuJarly in Local Area Network: (LAN) applications. Spread spectrum <br />provides high data rates at low transmit power. A recent FCC ruling (part 15) determined <br />that no license would be required for low power spread spectrum transmitter in the <br />following bands: <br /> 902-928 MHz (25 MHz bandwidth) <br /> 2400-2483.5 MHz (83 MHz bandwidth) <br /> 5725-5850 MHz (125 MHz bandwidth) <br />For successful implementation of spread spectrum radio, the following analysis will be <br />performed: <br />1. Line-of-Sight Requirements: In the range of 900 MHz and above, 1ine-of-sight to the <br /> receiving antenna is generally required. <br />2. Path Data Analysis: A path data sheet will be created for every path in the system, <br /> including any repeater sites. The analysis will show the potential reliability of each <br /> link. <br />3. Rodio Signal Test: A radio signal test will be conducted to verify the accessibility of <br /> each intersection from the repeater site. <br />4. Frequency Evaluation: An important step in the planning of a spread spectrum. <br /> installation is to evaluation the availability of frequencies in the proposed installation <br /> area and to search for clear spots within a band that are free of any potentially <br /> interfering signals. Spread spectrum signals are resistant to interference from other <br /> signals, but they are not immune to it. The spectrum analysis is important to avoid <br /> interference to the proposed links by other existing signals in the area and to avoid <br /> possible interference from the spread spectrum. signals to existing signals. <br /> Meyer, Mohaddes Associates, Inc. <br /> 26 <br /> .-.....~.. <br />