Message information terminating system

Message information terminating equipment in a switching center including a data terminal controller and a microprocessor, said message information terminating equipment comprising:

• serial/parallel conversion means for receiving frames of message data in serial format from remote stations and converting all data in said frames to parallel format;
• a check circuit connected to said serial/parallel conversion means;
• data latch means connected to said serial/parallel conversion means;
• first bit detection means connected to said serial/parallel conversion means, for generating a detection signal and delivering said detection signal to said data latch means and said check circuit;
• said data latch means storing message data from a plurality of data terminals, said data terminals respectively receiving message data of one of said remote stations;
• said check circuit being connected to said microprocessor and receiving said detection signal of said first bit detection means and message data from said data terminal controller and sorting sync data to check for a specified pattern of said synch data;
• and
• said microprocessor being connected to said data latch means and to said check circuit, for fetching said stored message data from said data latch means to check information including connection procedure information and subscriber information, maintenance information for subscribers, alarm information on a remote station side, and switching procedure information to switch to a spare line, and for detecting from said pattern whether or not a predetermined number of bits are normal message data and sending a detected result to a control processor, when said synch data is not in said specified pattern said control processor discarding the message data.

A message information terminating system in a switching center connected to a plurality of remote stations accommodating a plurality of subscriber stations via a plurality of transmission lines, comprising:

• an interface, connected to the transmission lines, on which a plurality of multiplexed channels following a leading bit form one frame, and a plurality of frames form one multiframe for receiving information from the subscriber stations via each channel and message information including synchronizing data and supervisory data via a series of the leading bits;
• a multiplexer for detecting the series of leading bits via each of the transmission lines upon establishing synchronization by the synchronizing data, and for multiplexing a plurality of the series of the leading bits;
• and
• a message terminator for receiving the multiplexed series of leading bits and for analyzing the message information formed by the series of leading bits.