2019-06-21 Telephone Ring Interception

from FB group Bell Telephone… June 21

Travis Russell
I connected a neon lamp – just the lamp with no resistor or no capacitor – across the incoming line. The 90VAC ringer current causes the neon lamp to conduct, but as soon as it conducts, the Lamp conducts DC and the CO senses it as off hook, and puts 48VDC on the line. But that’s not enough to keep the neon lamp conducting, so it goes out and the CO senses line as on hook. This all happens in milliseconds and at most the ringer might tink once, some phones don’t even do that. 👍👍👍

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