Centralized supervisory system

A centralized supervisory system in an automatic switching system, comprising:

• at least one remote office having a remote-office time-division switching system and a remote-office supervisory unit for supervising the system status of said remote-office time-division switching system;
• at least one first time-division multichannel line operatively connected to said at least one remote office, and having predetermined channels for transferring communication data representing voice signals;
• a central office having a central office time-division switching system connected through said at least one first time-division multichannel line to said at least one remote office, and a centralized supervisory unit for receiving supervisory data, representing at least the system status of said remote office, from said remote-office supervisory unit of said at least one remote office and for centrally supervising the received supervisory data, said central-office time-division switching system having predetermined output signal lines;
• first means, operatively connected to said remote office supervisory unit and said remote office time-division switching system, for allocating said supervisory data from said remote-office supervisory unit of said at least one remote office to one or more of the predetermined channels on said at least one first time-division multichannel line;
• and
• second means, operatively connected to said central office time-division switching system and said centralized supervisory unit, for connecting the predetermined output signal lines of said central-office time-division switching system to said centralized supervisory unit, the predetermined output signal lines transferring said supervisory data output from said central-office time-division switching system.