http://www.rfc-editor.org/rfc/rfc3498.txt
RFC 3498: Definitions of Managed Objects for Synchronous Optical Network (SONET) Linear Automatic Protection Switching (APS) Architectures, J. Kuhfeld, J. Johnson, M. Thatcher2003-03-01T23:00:00-00:00This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP based internets. In particular, it defines objects for managing networks using Synchronous Optical Network (SONET) linear Automatic Protection Switching (APS) architectures. [STANDARDS-TRACK]