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Orange County Emergency Management, North Carolina <br />Final VIPER Anal sis Re ort Au ust 20, 2004 <br />The VIPER baseline design in Orange County requires expansion of coverage in the <br />Northern and Southeastern areas of the county. Additional channels above the baseline <br />design of five channels per site will be required at some VIPER sites to provide the <br />capacity to support the Orange County users being added to VIPER. Radio sites <br />providing Orange County radio coverage will be connected to the Zone Master site <br />located in Raleigh. Orange County will have to purchase dispatch consoles and switches, <br />microwave links for the OCEM and LTNC-CH PSAPs, a site in the vicinity of Cedar <br />Grove, a site in the Chapel Hill area, and digita1800 MHz subscriber units to participate <br />on VIPER. <br />2.1 Microwave Connectivity of sites serving Orange County <br />NC-SHP has stated they will provide microwave connectivity to all Orange <br />County VIPER sites. Where new microwave links are required, NC-SHP will <br />determine the best path to the new site from their existing microwave network. <br />CTA recommends all microwave links added for Orange County's PSAPs provide <br />redundancy in the form of an alternate path or hot-standby equipment. <br />2.2 Dispatch (PSAP) Interfaces <br />The two ways to connect a PSAP into the VIPER network are direct console <br />connection and RF console connection using 800 MHz control stations. NC-SHP <br />favors the RF connected console approach. CTA recommends Orange County <br />PSAPS be directly connected via microwave links into the VIPER network at the <br />Zone Master site in Raleigh. We recommend this approach to meet NFPA 1221 <br />Dispatching Systems requirements. In addition to the direct connection to <br />VIPER, we recommend each dispatch position be equipped with a RF control <br />station as a backup in the event of loss of console communications with VIPER. <br />A comparison of direct console connectivity and RF linked console connectivity <br />favored by NC-SHP is described in the following paragraphs. <br />Section 2 -Technical Description of VIPER Network <br />.E~,s Page 5 of 43 <br />