SECURITY SYSTEM, ITS IMPLEMENTING METHOD, EXCHANGE MODULE, CENTRAL STATION EXCHANGE AND RADIO UNIT

摘要

PROBLEM TO BE SOLVED: To efficiently and effectively inform a participant of the operation inability occurrence of a communication line by installing the communication line connecting a security system and communication equipment and a signal generator emitting a system status signal to communication equipment at a prescribed cycle. SOLUTION: A central station exchange 210 receives a system status signal from a communication line 152 connected to a security system. When the security system status signal is received in accordance with a prescribed system status signal frequency, the central station exchange 210 continues the monitoring of the communication line on the system status signal. If not, the central station exchange 210 accesses the subscriber profile of a data base 256 and identifies a method for corresponding to the subscriber. The central station exchange 210 calls a concentrated security monitoring system 250 when the signal lacks.