[Asterisk-Users] FXO vs FXS question

[Andres Tello Abrego]

The way I explain the difference between fxo and fxs, is electrically...

The telco lines, PROVIDES voltage and current to makes the telephone 
ring, so the FXO is a device, adapted to recive this voltage an current.

The phone, NEEDS voltage and current, to ring, so the FXS is a device, 
adapted to provide this voltage and current.

So, if you plug an FXS to a Telco Line, both equiments PROVIDE voltage 
and current, so... what you have? Sparks and a short cut, and at least 
like 75usd of the fxs module or even worst, like 100usd for iaxy or fxs 
card :(



Wolf Paul wrote:
> Hello all,
> 
> as a relative newbie I obediently ordered the recently recommended
> "Newton's Telecom Dictionary" but it did not provide the answer to one
> of my question. Perhaps one of you can do so.
> 
> What is the difference in functionality between an FXO and an FXS port?
> I know that the line from telco goes into an FXO and standard POTS phone
> goes into an FXS, but since both types of ports must be able to both
> make and answer calls, what is the actual functional difference?
> 
> Or in other words, what does an FXO to FXS converter do (I have seen
> some mention but no explanation of those)?
> 
> Thanks.
> 
> Wolf Paul
> 
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