TR TSY 000509 : ISSUE 2 REV 1

Maintenance is the overall process designed into a switching system to minimize the effects of failure on system performance while providing the craftsperson with the information & tools required to quickly locate & repair the troubles. Included are: definitions of the maintenance requirements in the framework of switch maintenance, circuit maintenance, maintenance measurements & remote maintenance interfaces; requirements for trouble detection, service recovery, trouble notification, verification, isolation, repair & maintenance person-switching system interfaces; maintenance of trunks & customer loops; maintenance measurements; the interface requirements for the remote maintenance center; the standards to be used for the human machine interface; & a Glossary defining many of the words used.