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 The long-term cost of leased circuits tend to exceed the cost of an owned and maintained microwave link within approximately ten years. Backup RF Control Stations In addition to normal connection to the Zone Master, separate backup radios at each console operator position are recommended. These radios will be used to provide backup in the event of console failure, failure of the telecommunications link for consoles and if the sites revert to Site Trunking Mode. Normal Operation In normal operation, telecommunicators communicate with field units via the VIPER network through a direct link to the VIPER Zone Master. Telecommunicators will have control and monitoring capability of VIPER talk groups and conventional radio channels remaining in service after VIPER is implemented in the county. Site Trunking Mode Site Trunking mode is the result of a failure of the link between a radio site and the Zone Master site in Raleigh. The affected site supports local calls but not wide-area calls. In Site Trunking mode, the direct connected consoles cannot communicate with field units on that site. Backup radios should be installed at each dispatch operator position programmed with all sites providing radio coverage for Orange County units to allow direct access to a VIPER site operating in Site Trunking. The backup radios must be connected to an antenna system to permit accessing 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. :Y~®~_ z '.. r ;_. Section 2 -Technical Description of VIPER Network Page 7 of 43