Telemetry arrangement

Telephone connection or telemetry system which in addition to normal service, ie voice connection, fax, data transmission etc. provides a secure two-way connection between a company or an enterprise and special subscriber equipment CPE for voice and / or data. The system uses a user telemetry interface unit TIU. A central unit COSU that is connected to a switching system via an auxiliary iron line UTT is used as an interface between the company or the company and one or more connection switching systems. COSI provides detailed call instructions and data that determine the service to be provided by the system. The detailed instructions serve to determine the source and character of the signals to be used to activate the TIU, provide the sub-addresses of the CPE handled by a TIU, perform line monitoring, and find the permissible monitoring state of a used line at the time of connection with a TIU. TIU, broadcast of sequences or messages etc.