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

[Jon Pounder]

asterisk-users at rogg.is wrote:

couple last words on this - if that is the application, then ringing the 
remote terminal may not even be necessary, you really only care about 
the hookswitch and audio which is a different thing entirely from ringing.

You may be able to boost the battery voltage with a simple dc adapter in 
series to get the line build out capability you need. Just make sure its 
floating with respect to ground and wire it in. Don't be afraid of 
hurting the phone, you won't.

Check out dialplans for the ATA's for warmline and hotline for emergency 
phones you will probably want this. This is one I use for example

warm dial - wait 3 sec and if not 3 digit number dial 100
( P3 <:100>|xxx )

ie: if they know who they want locally on the pbx they have 3 seconds to 
dial it, otherwise the ata just dials extension 100 which is an 
entrypoint to one of the IVR trees on my system.

> Appreciate all your input folks. Much of it very helpful in the greater
> context of the initial question.
>
> Thank you for the suggestion of using various wireless devices, but I'm
> stuck with fixed wiring since this is a security/emergency phone(s)
> installation underground in large tunnels.
>
> Also, switching to VOIP is not really the answer here because then I'm
> forced to solve a lot of power, repeaters/switches problems that arise. So
> I'm actually worse of than using the analog connections I think.
>
> I do have some control over the wiring/cable chosen for this project but
> still forced to find a solution where I can feed the analog "phone line" the
> total 3km line distance.
>
> I would love to find a way to do this in the Asterisk context with some sort
> of FXS feed, either from Digium (or compatible) hardware or any of the
> available ATA boxes. The Sapura box suggestion may be something and I'll
> look closer into that as well as continuing to look for other ways to do
> this.
>
> tnx!
>
> Baldvin
>
>   
>> -----Original Message-----
>> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
>> bounces at lists.digium.com] On Behalf Of Hans Witvliet
>> Sent: 26. maí 2009 19:42
>> To: novackster at gmail.com; Asterisk Users Mailing List - Non-Commercial
>> Discussion
>> Subject: Re: [asterisk-users] Maximum cable length for analog phone
>> from FXS port
>>
>> 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
>>
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