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Operation Administration and Maintenance
A set of network management functions that provide for network fault and performance management, analysis and fault isolation. OAM functions exist in carrierclass TDM and ATM networks, but are now also being implemented in MPLS and Ethernet networks. These capabilities will provide the basic tools for carriers to monitor, diagnose, and troubleshoot first-mile Ethernet access links.


Open Systems Interconnection Model
A seven-layer model of network communications developed by the International Organization for Standardization (ISO).


Open Shortest Path First
A protocol which is a hierarchical IGP for routing in IP, using a link-state in the individual areas that make up the hierarchy.

Out-of-Band Connection

A remote link, or a link outside connected networks, established over a modem. It is useful when network communications are not available.