[LUNI] OT: VoIP Satisfaction
Benjamin Mayer Stocks
stocksb at ieee.org
Fri Mar 11 16:54:30 CST 2005
On Fri, 11 Mar 2005, Andrew Close wrote:
> 90V!!! i thought it was 12V..? i've been bit doing this before. it
> was kinda funny. i was helping my dad splice a new line into our
> existing phone line when i was a kid. he asked me to hold the wires
> while he did something and then someone called. :D it was quite
> funny. scared the crap out of me at the time though. but it wasn't a
> big jolt other than being a surprise.
Ringing on an analog line is typically in the range of 70v RMS on top of
battery which is about -50v DC. So when a line is being rung it will swing
from like -90v to -10v (ballpark). Phone networks like BIG voltages, ISDN
battery feed is -95v DC!
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