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

[Jon Pounder]

John Novack wrote:
> If this is an emergency phone situation then I would question the wisdom 
> of even considering using Asterisk.
> Conventional telephony solutions exist that will easily cover the loop 
> length and provide the reliability that should be required  by risk 
> management in such a situation.
>   
why are you going on the assumption asterisk is somehow inherently less 
reliable than a "conventional" solution ?

I am not trying to start any sort of war here, but is that based on any 
sort of facts ? hardware wise its basically all the same electronics 
whether they were meant as a general purpose computer or a telephony 
specific computer - they all fail eventually and the MTBF is usually 
related to the relative price in the specific market. I have not really 
had any software reliability problems in years of running asterisk 
(although some do and I am sure there are firmware revs for pbx's that 
have issues too)

so why make that general statement ?

as far as risk management - any one system can fail, end of story. Risk 
management would entail a backup system if failure of the primary is not 
acceptable. In a tunnel application physical damage to the wiring is 
probably a lot more likely than a hardware failure, be it from accident, 
fire, collapse etc., meaning when you need the phone most, it is least 
likely to work. Those factors would affect any hardwired telephony 
solution equally.

> John Novack
>
> asterisk-users at rogg.is wrote:
>   
>> 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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>>
>>
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>>   
>>     
>
>