Leakage resistance, capacitance, AC voltage, DC voltage inductive coupling between lines Tip, Ring and Earth. Feed voltage on the switch.
Sent Howler Tone and Test Tone to the subscriber, DP/ DTMF dialing/ chat on the switch. Send pulse charging toward common to test payphones
Caller ID, Estimation of short circuit between Tip and Ring, Working with input supply voltage with a frequency of 50Hz or constant voltage 240-200 72-36
All ports
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