COMMUNITY ALARM SYSTEM

摘要

A community alarm system comprises N alarm units, each comprising: a) means for generating a warning signal indicative of an abnormal situation, such as a burglary, a fire, etc.; b) a telephone associated with the means for generating a warning signal for transmitting a generated warning signal to at least one security company; c) a transceiver means connected with the means for generating the warning signal and the telephone. Said transceiver means are arranged in a ring network and communicate at least with their direct neighbours in the ring network to ensure that a warning signal is transmitted to the security company even if the telephone associated with the means for generating a warning signal is defect or engaged.