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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.<br>
<br>
Jon Pounder wrote:
<blockquote cite="mid:4A1C66BE.20006@inline.net" type="cite">
<pre wrap="">John Novack wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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.
</pre>
</blockquote>
<pre wrap=""><!---->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.
</pre>
<blockquote type="cite">
<pre wrap="">John Novack
<a class="moz-txt-link-abbreviated" href="mailto:asterisk-users@rogg.is">asterisk-users@rogg.is</a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:asterisk-users-bounces@lists.digium.com">asterisk-users-bounces@lists.digium.com</a> [<a class="moz-txt-link-freetext" href="mailto:asterisk-users">mailto:asterisk-users</a>-
<a class="moz-txt-link-abbreviated" href="mailto:bounces@lists.digium.com">bounces@lists.digium.com</a>] On Behalf Of Hans Witvliet
Sent: 26. maí 2009 19:42
To: <a class="moz-txt-link-abbreviated" href="mailto:novackster@gmail.com">novackster@gmail.com</a>; 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:
<a class="moz-txt-link-freetext" href="http://www.fit-pc.net/fitpc-2-p-2.html">http://www.fit-pc.net/fitpc-2-p-2.html</a> or <a class="moz-txt-link-freetext" href="http://www.fit">http://www.fit</a>-
pc.info/downloads/handleidingen/fit_pc_2_eng.pdf
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<pre wrap="">
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<pre wrap="">
</pre>
</blockquote>
<pre wrap=""><!---->
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