NEMOS-the network management system for the AT&T long distance network

A description is given of the NEtwork Management Operations System (NEMOS), the operations system supporting AT&T´s evolving Dynamic Non-Hierarchical Routing (DNHR) network. NEMOS provides the ability to monitor and control the nationwide DNHR network from a single site. The system is a multiprocessor application consisting of AT&T 3B20S processors and hardware relational database machines interconnected with the AT&T 3BNET local area network. Unique hardware and software contributions and state-of-the-art computer science techniques are used in the areas of fault-tolerant software systems, distributed systems and database processing, network management systems, particularly the automatic rerouting of calls to use idle capacity, and interactive graphics display systems. These topics, along with a general systems overview and operational experience are presented