Cochise是亚利桑那州第四大县，跨越6200平方米，包括墨西哥的陆地边界。边境联盟集团（包）是需要可靠的无线电通信网络的美国政府机构之一，以防止美国和墨西哥之间的国际贩毒。
Download client story as a PDFCochise had two primary goals to achieve when upgrading its existing analog simulcast system to a digital network: to provide wide area saturated coverage and to prevent conversations being intercepted.
The County features a number of hills and adjacent basins meaning received signal quality can be poor and coverage limited. Coverage and clarity of radios are extremely important for the emergency services as many calls can be highly critical. In particular, BAG is a multi-agency task force responsible for seeking out and monitoring narcotics smuggling corridors. These passages often are in remote or less uninhabited areas.
该集团已易于使用扫描仪拦截其无线电对话的人群，或者先前必须使用带有模拟加密的无线电，这意味着与数字收音机相比更较长的距离。最后，许多组织在模拟网络上使用各种竞争对手的可口和移动设备。Cochise希望确保这些产品将在任何未来的解决方案上工作，避免立即升级整个用户单位队列的财务负担。
当Cochise于2002年移动到窄带系统时，Durham通信推荐从竞争对手的单站系统迁移到泰特网5站点，5声道QS2 Simulcast系统。
对于数字升级Cochise再次转动到Tait Partner Durham Communications，他建议了三个网站APCO P25 VHF Simulcast Digital解决方案。三个站点中的每一个由TB9100，Cisco Network Switch和路由器组成，而警长的调度中心包含TB9100网关。TAIT Digital Simulcast通过重用Cochise中可用的有限频率来提供频谱效率。这使该县能够避免在购买多种频率时花钱。
By utilizing the same frequency on different sites, coverage is overlapped resulting in improved saturation throughout the County. The radio users who gained the initial benefits of the simulcast system were those upgrading from analog portables and mobiles to Tait P25 subscriber units, which feature superior voice clarity. Importantly, these radios were equipped with DES encryption to prevent messages from being intercepted from those outside the network.
在安装解决方案的小时内，该袋在网络上使用TAIT RAIRO来执行搜索权证。加密的数字无线电意味着该组可以使用无线电操作而不担心它们可能被截获。
BAG can switch between simplex and repeater channels, but also can use the analog channel for ease of inter-agency collaboration. Since installation, several other organizations are using Tait subscriber units on the system.
Overall, the Tait P25 simulcast network has improved coverage by 40 per cent in the southern area of Cochise County.
