摘要:
Method and apparatus for sectionalization and self--diagnosis of loop start and ground start trunk interfaces (10) without intervention from host telephone company equipment. The inventive method entails the use of an isolation relay (110) in the trunk circuit to isolate the trunk circuit electrically from the physical medium and to apply various signals to portions of the isolated trunk circuit to carry out specific self-diagnostic tests.
摘要:
Method and apparatus for sectionalization and self--diagnosis of loop start and ground start trunk interfaces (10) without intervention from host telephone company equipment. The inventive method entails the use of an isolation relay (110) in the trunk circuit to isolate the trunk circuit electrically from the physical medium and to apply various signals to portions of the isolated trunk circuit to carry out specific self-diagnostic tests.