D4 channel bank with multi-mode formatted, performance-monitorin
Data correction system for communications network
Data correction system for communications network
Data diagnostics with leds on the face of a telephone
Data preparation for traffic track usage measurement
Data terminal for telephone circuits
Data transmission system and method having improved alarm inhibi
Database driven methods and systems for real time call tracing
Design and architecture of an impairment diagnosis system...
Detecting faults in subscriber telephone lines
Detecting faults in subscriber telephone lines
Detecting make-break clicks on a telephone line
Detection of bridge taps by frequency domain...
Detection of bridged taps by frequency domain reflectometry
Detection of deviations in monitored patterns
Determining echo return loss in echo cancelling arrangements
Determining the composition of physical structures from...
Determining the composition of subscriber loops from...
Determining the physical structure of subscriber lines
Device and method for suppressing DSL signal echo induced by...