[asterisk-users] Maximum cable length for analog phone from FXS port

[Hans Witvliet]

On Tue, 2009-05-26 at 10:26 -0400, John Novack wrote:
> That is a pretty long run.
> The type of analog phone can be an issue. How LITTLE loop current will
> it operate on? Most need more than 20 Ma to signal properly, and the
> voltage output of the ATA needs to be known
> Type of signaling? DTMF? pulse?
> Interconnection cable wire size and capacitance will affect high
> frequency response, loop current, inductive pickup and pulse shaping
> to name just a few. The ATA requirements need to be known. A total
> loop resistance of 500 ohms should work, but go out to 1200 and most
> will fail
> Do you really have control over this or will you be renting a pair
> from the local telco?
> Protection should be applied on both ends for safety of the user(s)
> and devices.
> There MUST be a better way???
> 

I would suggest making a wifi connection with directional hi-gain
antenna's.
Ans a small box at the other end. Have a look at:
http://www.fit-pc.net/fitpc-2-p-2.html or
http://www.fit-pc.info/downloads/handleidingen/fit_pc_2_eng.pdf