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

Browse Search

Orange County Emergency Management, North Carolina Final VIPER Anal sis Re ort Au ust 20, 2004 Public Safety Talk Groups Both the privately owned system and VIPER network will accommodate public safety (emergency responder) talk group requirements. Existing public safety use radio channels in Orange County will be allocated a talk group if the users on the channel migrate to VIPER.. In addition, an Orange County mutual aid talk group and five Tactical Fire talk groups will be assigned to Orange County. VIPER has designated eight Mutual Aid CJIN broadcast talk groups statewide to support interoperability. The privately owned system offers greater talk group assignment flexibility due to Orange County having full control over the network and its talk group assignments. NC-SHP will monitor talk group activity once all the Orange County users migrate to VIPER. If a talk group has less than 5% use during a six month period, the entity may lose the talk group assignment. Non Public Safety Talk Groups The privately owned system will accommodate non public safety (public service) talk group requirements. VIPER limits non emergency responder talk groups to two for each entity. Limiting non public safety talk groups to two would require multiple work groups in an entity to share the two talk groups. LTNC Chapel Hill for example, has eight major non public safety work groups. If limited to two non public safety talk groups, UNC Chapel Hill users would then hear radio traffic unrelated to their work group from other work groups as a result. For the majority of entities with non public safety users, the disadvantage of a shared talk group is outweighed by having wide area coverage throughout the county and the ability to directly interoperate with other entities work groups on the VIPER network. Talk Group Scan Talk group scan is useful in the simulcast configuration used in the private system since all sites are transmitting each talk group call. Trunked talk group scan has limited usefulness in a multi-site network such as VIPER due to the dependence of the call being routed to the site. If there are no registered users on a site for a talk group being scanned then the calls associated with the call will be missed. Section 7 -Comparison of Private System and VIPER =x.,~ Page 30 of 43 ~~ _. ,.