Communication device for alarm signal transmission

摘要

The device includes a communication network which has a subscriber installation with multiple service units (1) which send consumer information to distributors via a network (2). The multiple service units can be used for example by electricity and gas providers. An alarm system (3) is connected into the service network. Each service unit contains a modem which transmits call signals using SFSK signals and a modem which transmits alarm signals using FSK signals. The frequency band used by the FSK modem is between the two frequencies used by the SFSK modem. A computer controller ensures automatic communication.