It is a very economical way to control multiple repeaters and links. Ports 4 - Full duplex ports that can be connected in any combination to all other ports.
Ports can operate as links or repeaters connected or stand alone.
Each port has its own Hang Timer, Time-out Timer, Courtesy Timer, Courtesy Beep, and ID Timer. All the timers are user programmable. There is a separate DTMF decoder on every port. An offset can be added to the reading from each analog line to compensate for variations in sensors. Each analog input can be alarmed to allow the system to execute commands in a high and low alarm condition.