An intrusion detection system, that comprises a multi sensors array deployable along a physical barrier means and linkable to it in a manner that enables sensing various phenomena (one or more), typically take place when an attempted intrusion act occurs through the physical barrier means, and generation of an indication when such a phenomenon is sensed, characterized by that, that at least in one of the sensors there is installed a processing component that belongs and is specifically allocated to the sensor and enables local analyzing of the sensed phenomena within said sensor.