Fiber SenSys’ FD34X series Fiber Optic Intrusion Detection System offers high performance intrusion detection with modern features and communication options. Designed for remote deployment with no power or communications needed in the field, the indoor and outdoor rated Fiber Defender™ Model FD341 Alarm Processing Unit (APU) utilizes insensitive fiber-optic cable in addition to sensing fiber. The use of insensitive lead-in cable allows the APU to be located up to 20 kilometers away from the protected zone. Movement or vibration in the physical environment causes the sensing fiber to report back to the APU that there is a disturbance.