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Joined: Jul 2005
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Anybody know of a device that will monitor a PSTN line and dectect a failure on it. When a failure is detected switch the phone device to another PSTN line? Thanks
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Joined: Sep 2006
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There are line failure circuits used in fire alarm system panels. They have a limited capability, however, because they only will detect a line voltage failure, (I believe) and not a failure of dial tone. You need to be aware that a POTS line can have -48V and ground, but no dial tone. Do a Google search for "Line fault monitor" here\'s one
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: Dec 2005
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RIP Moderator-Mitel, Panasonic
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RIP Moderator-Mitel, Panasonic
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I did a quick search under 'line fault' here and found nothing, But I believe this was discussed at length this year in one of the forums. If someone can find it, tell b_bears where it is. I usually only manage to waste time doing any kind of search on the WWW.  John C. (Not Garand)
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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Joined: Apr 2006
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Originally posted by b_bears:
Anybody know of a device that will monitor a PSTN line and dectect a failure on it. When a failure is detected switch the phone device to another PSTN line? Thanks Out of curiosity, what are you trying to provide backup dialtone for?
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Joined: Jul 2005
Posts: 36
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Did a google for "line fault" and that did it. Thanks. Must of googled everything but that. Narrowed it down to an Elk 980 or Honywell 968EN.
Texas Tech, just doing a little project of when my flakey PSTN line losses it connection, a bad splice between demarc and CO which they can not find as it comes and goes by itself, (seems they have no spare pairs, ya right) to switch to a VOIP line that I have for backup that always seems to work. The adsl is on a different pair. Basically just playing.
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Joined: Apr 2006
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Don't ya just love those kind of troubles.  At least your DSL is stable. :thumb:
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