Total Network Data System: National Network Management

Real-time monitoring and control of the network through a coordinated set of network management operations centers assures optimum call-carrying capacity during periods of stress caused by overloads and failures. Switching systems are controlled and monitored in detail in specific geographical areas at the 27 Network Management Centers (NMCs) that blanket the country. Regional Operations Centers (ROCs) coordinate NMC activities within each of the ten switching regions, and monitor and control the regional switching and signaling systems. To coordinate and manage the activities of the NMCs, the ROCs, and the two Canadian regional management centers, the na* Bell Laboratories. ®Copyright 1983, American Telephone & Telegraph Company. Photo reproduction for noncommercial use is permitted without payment of royalty provided that each reproduction is done without alteration and that the Journal reference and copyright notice are included on the first page. The title and abstract, but no other portions, of this paper may be copied or distributed royalty free by computer-based and other information-service systems without further permission. Permission to reproduce or republish any other portion of this paper must be obtained from the Editor. 2261