> > I was surprised to see that it's 240 volts (peak-to-peak)! Egad.. no > > wonder it shocks fingertips. > > > > 20Hz (50ms cycle), 2 second long clean sine waveform. I was just > > surprised to see twice as much voltage as expected. > > 240 sounds like a lot. Are you sure you were doing DC measurement? > Normal is +/- 90 - 120, generally at least 48VRMS or about 70V.
The ring generators in the central office are typically set for something between 90 - 120 volts AC (RMS, not peak-to-peak) and have been since the hand crank phones disappeared. DC voltage has never been used in the US. Those telco's with long rural subscriber loops are likely to be towards the upper end of the ring voltage, while metro offices are more likely to be towards the middle to lower end. Depending upon the age of the central office, the actual ring voltage will vary depending upon exactly how many phone lines are being rung at exact same time. _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
