Intrusion detectors with optical transmission device; fence-mounted intrusion detectors with fiberoptic cable; intruder detecting apparatus comprised of camera, network switch, computer network hub and surveillance apparatus, namely, electronic video surveillance installations; intrusion detectors using optical fiber sensors; intruder alarm motion detectors, namely, passive infrared detectors, photo electric detectors, microwave detectors, laser detectors, photo beam detectors and multi-funct...