Line shunt and ground fault apparatus method
Line tester for coin-operated telephones
Line testing in a telecommunications network
Line testing in a telecommunications network
Line testing in a telecommunications network
Line testing method and apparatus therefor
Line/drop testing from a craft terminal using test unit
Listening device for tracing line continuity and detecting telep
Local loop test arrangement in an echo canceller based full dupl
Local/remote modification of electronically alterable operating
Localization of customer premises in a local loop based on...
Lockout device for preventing telephone eavesdropping from an ex
Long-distance transmission system and device
Loop certification and measurement for ADSL
Loop certification and measurement for ADSL
Loop detection signal issuing circuit in subscriber circuit havi
Loop integrity test device and method for digital subscriber...
Loop loss measurement and reporting mechanism for digital...
Loop loss measurement and reporting mechanism for digital...
Loop status verification system