Commonly referred to as TMN.
A set of standards based around ISO, X/Open standards and the CMIP protocol. Used to manage telecommunications networks.
Though many switches only support SNMP, so one has to develop a CMIP/SNMP proxy agent in order to adhere to the stricter requirements of CMIP.
Some overview information is available at http://www.alexandre.polozoff.com/tmn.html -- AlexandrePolozoff