Self-monitoring line interface circuit
Signal generator for tracing multiple transmission lines
Subscriber line impedance measurement device and method
Subscriber line test system
Switch-based line continuity verification method and system
System for measuring and automatically compensating for the dist
System for testing 2B1Q telephony loopback circuits and method t
Telecommunication alarm method and system
Telecommunication customer interface
Telecommunication system tester with integrated voice and data
Telephone line quality testing system
Telephone operator simulator
Telephone security violation detection device
Telephony Test Technique
Testing of subscriber lines in a digital switch
Testing system for digital transmission lines
Testing within communication systems using an arq protocol
Transmit power control for DSL modems in splitterless...
Two-wire channel unit with loopback test capability
Universal headset tester