On Saturday, September 20, 2003 10:37 PM, Mark Spencer [SMTP:[EMAIL PROTECTED] wrote: > > 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 local phone company will, while the phone is on hook, provide a 48 to 52 dc voltage at the central office. To ring a phone a 50 v ac signal is placed on top of this ~50 v dc. Don Pobanz > > Mark > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
