Agenda - 11-17-2011 - 1 - Attachment 1

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Orange County Emergency Management, North Carolina Final VIPER Anal sis Re ort Au ust 20, 2004 Normal Operation In normal operation, the RF control stations are controlled by the telecommunicator's console to monitor and transmit on talk groups selected by the telecommunicator. The console's transmission and reception is through the radio site selected to provide dispatch communications. Calls to and from talk groups with radios logged into another radio site in the county will tie up two channels minimum. One channel is required at the PSAP's end and one at the site providing radio coverage to the talk group being dispatched. Site Trunking Mode Site Trunking mode is the result of a failure of the link between a radio site and the Zone Master site at Raleigh. The site in Site Trunking mode will continue to support only local calls and wide-area calls are not possible involving the site. If Site Trunking occurs at the site supporting the PSAP console's RF Link stations, only trunked talk group calls originating at that site will be heard. If Site Trunking occurs at a site in another part of the county, calls originating at the distant site will not be heard by the telecommunicator. Backup radios should be installed at each dispatch operator position programmed with all sites providing radio coverage for Orange County units in the radio's personality. The backup radios must be connected to an antenna system to permit accessing as many if not all of the sites supporting Orange County. Telecommunicators will then have the ability to select a site in Site Trunking mode and communicate with units logged on to that site. Telecommunicator training in the operation of the backup radios is highly recommended. Section 2 -Technical Description of VIPER Network Page 9 of 43 . < ~.