Trunking ControllerThe Daniels P25 Trunked Radio System is controlled by redundant Daniels Electronics Trunking Controllers located in the bottom of the equipment rack shown below. The Trunking Controller is comprised of a software application running on redundant carrier grade servers housed in 2U packages as shown to the right.

The server’s Intel Core 2 Duo processors offer performance, ruggedness, reliability and long life to meet the mission critical needs of a P25 trunked radio system. Full redundancy is provided standard for all P25 trunked systems to ensure maximum reliability and minimal downtime for mission critical applications. Daniels also provides standard an Uninterruptible Power Supply (UPS) for the servers to ensure graceful shutdown in the event of a major loss of power.

Communications with each of the radio channels is accomplished via an IP connection to each radio channel (subrack) and its associated Universal Interface Card (UIC). Power monitors are also connected to the Trunking Controller to provide full alarm and management information to the Trunking Controller should a radio channel fault be detected. This enables the Trunking Controller to automatically switch the Control Channel to a Traffic channel to ensure continued operation in the event of a fault.

Daniels Electronics has selected the industry standard FreeBSD as its operating system for the Trunking Controller. FreeBSD is derived from BSD, a version of UNIX developed at the University of Berkeley in California. FreeBSD provides robust network services under the heaviest loads and uses memory efficiently to maintain response times during thousands of simultaneous processes.