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TELECOMMUNICATIONS SWITCHING EQUIPMENT MAINTENANCE SYSTEMS-NAMELY, CIRCUITS FOR MONITORING DIAGNOSTIC INFORMATION AT INDIVIDUAL SWITCHING UNITS, A PROCESSOR FOR CENTRALIZED PERFORMANCE OF DIAGNOSTICS AND MAINTENANCE, AND A NETWORK FOR COMMUNICATING DIAGNOSTIC AND MAINTENANCE AND CONTROL SIGNALS AMONG THE SWITCHING UNITS AND THE PROCESSOR TELEPHONE CENTRAL OFFICE LINE ASSIGNMENT SYSTEMS-NAMELY, PROCESSORS AND THEIR ASSOCIATED DATA BASES AS INDIVIDUAL SWITCHING UNITS, A PROCESSOR FOR CENTRALIZED ADMINISTRATION OF THE DATA BASES, AND A NETWORK FOR COMMUNICATION OF DATA BASE INFORMATION AMONG THE SWITCHING UNITS AND THE CENTRAL PROCESSOR AND PARTS THEREOF