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

[Lyle Giese]

Even with 'conventional' PBXs, there is such a thing as power fail
devices where the extension is cut to a telco pots line for dial tone if
the PBX goes down.

Jon Pounder wrote:
> 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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>>>   
>>>     
>>>       
>>   
>>     
>
>
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