Advanced intelligent network based computer architecture for con
Anonymous interactive telephone system
Audio interface for telecommunications test system
Back wiring board and aggregated device
Board-to-board test unit for a digital subscriber line
Cable pair tester
Cable pair tester
Channel check test system
Communication network cut-off detection arrangement
Customer line tester
Data transmission system and method having improved alarm inhibi
Digital service unit
Electronic controller for sprinkler systems
External analog loopback
External apparatus for monitoring a communication system
Fast and noise-insensitive load status detection
Integrated bit error rate test function in analog channel unit o
Line current test device
Loop detection signal issuing circuit in subscriber circuit havi
Loop status verification system