Abstract: A two-ended, line-driving and receiving/tone signal analysis system performs line connection verification applying a low-distortion, low-amplitude test signal to one end of a cable pair under test and monitoring the response of a remote end wireline pair. Preferably the test signal frequency is on the order of 110 Hz, which avoids domestic and foreign AC power signal frequencies and is spectrally equidistant from their harmonics. It also avoids ringing frequencies for POTS lines, and remains safely below the 350 Hz lower limit of POTS and other telephone line system services. In response to application of the 110 Hz test signal to tip and ring segments of a wireline pair at one end of the cable bundle, the energy of the 110 Hz component, as well as that of two other ‘spectrally nearby’ (slightly higher at 112 Hz and slightly lower at 108 Hz), are measured at a tip and ring pair at the far end of the cable plant.

Abstract: A wireless butt set for testing a telephone line includes a base station that is connectable to tip and ring leads of a line under test and is configured to be operated by a wireless telephone handset. The handset is detachably nestable with the base station to form a hand-held integrated butt set assembly. This configuration allows a craftsperson to directly or remotely control the test set using controls of the wireless telephone handset. The internal circuitry of the base station is placed in a high impedance line-monitoring mode without going off-hook, in response to one ‘click’ of a talk switch of the handset, and goes off-hook in response to a ‘double-click’ of the talk switch the handset.