FP400 Product Guide
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System description
The FiberPatrol FP400 is a fence-mounted perimeter intrusion detection system that detects
intruders using a fiber optic sensor cable that is attached to the fence. The FP400 processor uses
interferometry technology to measure the strain in the sensor cable caused by climbing, cutting,
lifting, or otherwise disturbing the fence fabric. The processor monitors four independent sensor
zones, each with up to 300 m (984 ft.) of sensor cable.
The sensor cable is communication-grade single-mode fiber optic cable intended for outdoor
installation. The cable includes 12 fibers and each detection zone requires 2 dedicated fibers. The
number of unused (dark) fibers available for other perimeter applications depends on the
configuration of the zones. The sensor cable is easily attached to the fence with UV resistant cable
ties. All fiber splices require fusion splicing and the fiber optic connections to the processor use
SC/APC type connectors.
For each sensor zone, the processor transmits laser light through an optical output channel (TX)
into a fiber in the lead-in cable. Up to 20 km (12.4 mi) of non-detecting lead-in cable carries the
light to the start module where it is sent down the two sensing fibers. At the end of the zone, the
end module reflects the light back to the start module, which in turn sends it to the processor
through an optical input channel (RX). The processor analyzes the detection signals from each
zone and triggers an alarm when a fence disturbance meets the user-defined criteria for a valid
intrusion.
Figure 1 Senstar block diagram - single zone closed perimeter example
start module
maximum single zone cable length = 300 m (984 ft.)
non-detecting lead-in cable
equipment room
perimeter
processor
security management
max. length 20 km (12.4 mi.)
system or other alarm
annunciator
splice enclosure
end module
splice enclosure