Patent ID: 7907720

Claim:
A test method for analog telephone line equipment including a resistor array adapted to couple said equipment to an analog telephone line, a first selector between said resistor array and said telephone line for isolating said equipment from said telephone line, a second selector for applying to said equipment a ringing signal, the second selector including a low-frequency alternating component, and an off -hook/on-hook detector circuit delivering an off-hook/on-hook logic signal, the method comprising: isolating said equipment from said telephone line, applying said ringing signal, and analyzing said logic signal which, if said resistor array is defective, includes a succession of 1 and 0 at the frequency of said alternating component of said ringing signal, the logic signal being based on a voltage comparison between at least a first bridge and a second bridge, the first bridge and the second bridge connecting two inputs of the resistor array.