Telecommunications line test extension apparatus
Telecommunications line test extension apparatus
Telephone test device
Telephone test set
Telephone trunk line testing circuitry
Termination circuit for network interface unit
Test interface adapter emulating no test trunk interface for non
Test interface adapter emulating on test trunk interface for non
Test trunk access controller
Testing an operational support system (OSS) of an incumbent...
Testing telecommunications equipment
Tone location device for locating faults in a paired line
Transmission line signal sensing circuit employing means for con
Trunk identification system
Twisted pair status indicator
Two-ended wireline pair identification system