Subscriber control module having a test apparatus for asynchronous transfer mode

A subscriber control module comprising:

• a cell multiplexing/demultiplexing means coupled to a subscriber switching network module for the connections between subscriber matching modules, repeater line matching modules, subscriber switching network modules, connection switching network for multiplexing and transporting cells into the subscriber switching network module, demultiplexing cells received through the subscriber switching network module, and transporting them depending upon destinations:
• a call-connecting control means coupled to the cell multiplexing/demultiplexing means, for receiving and transporting internal control cells between the call-connecting control means and the cell multiplexing/demultiplexing means, outputting warning messages of Off_Alm and Fun_Alm, and communicating with a maintenance control module in a central exchange subsystem to control call connections;
• a test functioning means for analyzing the received internal control cells in response to the receipt of internal route testing commands through the internal control cells incoming from the call-connecting control means, generating and transporting test cells appropriate to internal testing routes, analyzing the test cells received through the internal testing routes, reporting the results of the analysis in internal control cell format to the call-connecting control means, and outputting the Off_Alm, Fun_Alm warning messages;
• and
• a warning message collecting means for collecting warning messages generated from the test functioning means, call-connecting control means and cell multiplexing/demultiplexing means, and also collecting warning messages generated from respective modules in the local exchange subsystem, and reporting the results of the collection in the internal control cell format to the call-collecting control means.