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SECTION 1.+:• SYSTEM D_ ,CRIPTION/PERFORMANCE The UDS V.3229, 14.4 Kbps modem permits communication between the RNC and the base station equipment over Type 3002, voice -grade full duplex communications circuits, or equivalent. This unique LIDS modem is designed to operate in the harsh environment often encountered at radio sites. It contains RF shielding to ensure that strong radio signals do not interfere with successful data transfer. It is built with heat tolerant components to ensure it withstands the temperature extremes -30" to +60°C encountered at some base sites. In addition, the modem contains both analog and digital loop back circuitry that enables the RNC to conduct remote diagnostics and check the performance of the communications circuit to the base site. 1.1.2.1.2 VRM600/Data Ready Spectra Radio Mobile Device The VRM600 Vehicular Radio Modem is designed to connect data terminal equipment (DTE) to Motorola data -ready mobile radios, which together comprise the mobile equipment of this high capacity wireless data system. DTE such as laptop computers, ruggedized mobile data terminals, and other Motorola or third -party DTE that support Motorola's Transparent Mode (using the industry standard AT command set) or Motorola's Native Mode may be interfaced. In turn, the modem and radio provide the field unit access to the Motorola wireless data fixed network equipment. The VRM600 will support Motorola's advanced, over - the -air, RD LAP 9.6 Kbps protocol for the highest message throughput and reliability available with your given frequency. The VRM600 is comprised of Motorola's Spectra 800 MHz mobile radio and RF modem in a single integrated unit. Like the Spectra radio, the VRM600 is designed to withstand the harsh conditions of the mobile environment. Specifications are compliant with industry and Motorola's stringent standards for durability, reliability, EMT, RFI, vibration, and shock. The modem adheres to the same standards and is subjected to the same rigorous tests as our mobile radios. 1.2 SYSTEM PERFORMANCE 1.2.1 RD-LAP Data Transmission Standard Motorola's RD-LAP data transmission standard has been designed to optimize accurate transfer of data over land mobile radio channels. Data is transmitted at 9,600 bps over 12.5 kHz, 821-824 MHz channels. Approximately one-fourth of the information sent consists of error detection and correction code to provide optimum, single transmission, error -free messaging. The result is a 95% packet success delivery rate at a 1% RF-induced bit error rate. �w,rarar�ou, Confidential and Proprietary I ',• 3