The Loop Management Operations System (LMOS) is a telephone company trouble ticketing system that plays an essential part in the act of repairing local loops (telephone lines). When a problem is reported to the Centralized Repair Service Answering Bureau (CRSAB) by a subscriber dialing the designated number (often (1)+611) it is filed and relayed through the Cross Front End, which is a link from the CRSAB to the LMOS network. The trouble report is then sent to the Front End via the Datakit network, where a Basic Output Report is requested (usually by a lineman working with). BORs consist of line information including past trouble history and MLT (Mechanized Loop Testing) tests. As LMOS is responsible for trouble reports, analysis, and similar related functions, MLT does the actual testing of customer loops. MLT hardware is located in the Repair Service Bureau. Test trunks connect MLT hardware to the Wire Centers, which in turn connect with the subscriber loops.
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