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

[Steve Underwood]

Tzafrir Cohen wrote:
> On Tue, May 26, 2009 at 05:39:46PM +0200, randulo wrote:
>   
>> On Tue, May 26, 2009 at 5:31 PM, Danny Nicholas <danny at debsinc.com> wrote:
>>     
>>> I run my analog telco over cat5, but that's in-house and definitely not 3km. That sounds really far for current loop stuff.
>>>       
>> I was doing that too. I asked this same question a few years ago and
>> the answer was 100-200 meters. This is just a quick rule of thumb, but
>> it seems about right. 3km, I doubt that would work, but it depends, as
>> someone said, totally depending on ohm's law :)
>>     
>
> If it were to depend solely on Ohm's law, than 3km would be marginal but
> probably within reach. Not exactly sure what other factors are there to 
> count.
>   
The copper planning limit (or whatever local term your telco uses) is 
typically 10km.

Steve