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 2.2.1 Direct connections to Zone Master Site Description Direct connected dispatch requires connection between a PSAP and the Zone Master equipment at Raleigh. The direct connection can be via a microwave link from the PSAP to a VIPER microwave site to route the connection to the Raleigh Zone Master site. An alternate means of providing a link is via a leased T1 circuit to a site in the VIPER network or directly to the Zone Master in Raleigh. Direct connection provides the consoles full dispatch control, sufficient capacity to eliminate blocked calls and console override capability. CTA recommends that microwave links be used for connection into the VIPER network. Microwave Advantages are the link is under the control of Orange County and NC- SHP on a dedicated microwave circuit. Link path redundancy is assumed and providing high link reliability. Disadvantages are that microwave has a higher initial cost compared to a leased link. Microwave links require more hardware and maintenance to keep in operation over the long term. Leased line links Advantages are that leased links have a lower initial cost compared to a microwave link. Leased links require less hardware to place into initial service. If OCEM plans to relocate in the future, a leased line link from OCEM's current location can provide a temporary direct connection into VIPER until OCEM relocates. The disadvantage of the leased link is lack of control by Orange County or NC-SHP. If the link fails, a third party carrier must be contacted to restore the link. Security of a leased link is a concern as it is out of Orange County's or NC-SHP's control. Section 2 -Technical Description of VIPER Network ,:a ~ Page 6 of 43 ® , :"., ..,