Method and system for the transmission of information and analog signals and / or digital, using the private telephone network as a support for the transmission.

摘要

The signal transmission system for analogue and digital signals is intended for use with a private telephone system, and includes transmission of the signals by frequency multiplexing using a frequency band extending from 5 kHz to 10 MHz. Coupling is not provided between all telephone lines, but between independent networks or sub-networks. The frequency band may be divided into three ranges, and at the outputs of the private exchange there are a number of passband filters, connected to the inputs of distributors. These prevent the injection of any high frequency signals from the private exchange into the public network. USE - System allows grouping of telephone extensions e.g. between different types of user in hospital, administrative centre etc.