What are the similarities and differences between OSS and NMS?

What are the similarities and differences between OSS and NMS? I've been looking for accurate definitions.

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Wikipedia's entry on operations support systems (OSS) offers a pretty good definition: A network management system (NMS) is just part of OSS, which also includes service fulfillment (including activation, provisioning and delivery), service assurance, customer care, and billing.

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Intelligent network automation holds promise for operators Operators must make the move from network management to intelligent network automation. Altran's Ben Pietrabella discusses how to transition to an automated network management system and the impact ...

network management system A network management system (NMS) is an application or set of applications that lets network engineers manage a network's independent components inside a bigger network management framework and performs several key functions.

Wanted: A new network management model for NFV NFV network management models need to be less device-driven and more focused on orchestration across legacy network components and virtual resources.

Virtual networks require fresh look at management and orchestration Operators need new management and orchestration systems to support virtual and physical networks and to link network elements to customers' services.

Network Functions Virtualization demands new network management models NFV aims for dynamic network provisioning and orchestration, requiring a new network management model that integrates legacy and virtual resources.

ValidEdge unveils NMS antimalware appliance at RSA Conference 2011 ValidEdge unveiled its Network Malware Security system, designed to stop unknown zero-day malware and single-target malware attacks.

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