Telephone tester

摘要

A software-controlled telephone tester permits untrained consumers to test telephone sets by connecting the line cord to the tester and following simple instructions which are sequentially displayed on a panel. Tests are automatically performed after each instruction to provide objective determinations of the operability of the telephone under test. Tested parameters which fall outside specification result in a failure indication. If the user fails to effect certain instructions properly, a "try again" instruction is generated. Transmission tests are effected automatically by placing the telephone earpiece and/or mouthpiece adjacent a transducer and transmitting at least one tone from the tester through the telephone and back to the tester. Preferrably a two-tone test is employed using a pair of the standard DTMF signalling tones so that transmission testing is effected using the same circuitry employed for DTMF dial testing. The tester transducer is recessed behind the tester panel to reduce the effect of amplitude variations caused by small positional differences in the placing of the mouthpiece/earpiece adjacent the transducer.