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 >> >> [email protected] 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: [email protected] [mailto:asterisk-users- >>>> [email protected]] On Behalf Of Hans Witvliet >>>> Sent: 26. maí 2009 19:42 >>>> To: [email protected]; 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 >>>> >>>> _______________________________________________ >>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >>>> >>>> asterisk-users mailing list >>>> To UNSUBSCRIBE or update options visit: >>>> http://lists.digium.com/mailman/listinfo/asterisk-users >>>> >>>> >>>> >>> _______________________________________________ >>> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >>> >>> asterisk-users mailing list >>> To UNSUBSCRIBE or update options visit: >>> http://lists.digium.com/mailman/listinfo/asterisk-users >>> >>> >>> >>> >> >> > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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