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Product Documentation of the LSN Radio Fire Detection System
1. Product Description
1.1. Radio fire detection system overview
The system works on a new band that is only released for security technology,
868 - 870MHz SRD (Short Range Devices band), and has a radio license in line with
ANNEX 4, Directive 99/5EC Radio recognition. The SRD band is not subject to long
range amateur radio or industrial, scientific and medical applications with high trans-
mission power. This permits a high transmission/functional reliability.
The radio fire detection system (the radio cell) comprises an RF expansion module
and up to 30 RF smoke detectors. As an LSN element, RF expansion module
FK100 LSN is connected in a loop or stub line and forms the interface between the RF
smoke detectors and the fire panel.
Information transfer between the detector and the expander is bi- directional. If
a B- channel is occupied by another system, this is detected immediately and the radio
cell switches immediately to an alternative channel to guarantee alarm transmission
RF smoke detector
(1 . . . 30)
Fire panel
Radio cell
RF expansion module
Local Security Network
LSN
LSN detectors
Seite 3 von 32
PI - 32.15a
601-F.01U.002.708
A3.en / 28.12.2004
ST-FIR/ PRM1 / deh
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