[Asterisk-Users] Line Override Device

[Shawn L. Djernes]

Hello,

I am trying to solve a problem that I can foresee when I deploy Asterisk
into a few SOHO situations soon.  In Nebraska and in my area of Western
Pennsylvania we have violent thunderstorms in spring and summer and
sometimes very heavy wet snow in Winter.  Both type of event will take out
the power of a period of 30sec to 36-hours.  So no UPS system would be able
to handle a system for over an hour.  So what I am wanting to build or buy
is a device that when normal power is on and we have battery output on a FXS
that the line dumb analog phone talks to asterisk, but when the UPS has
shutdown and our phone system goes down, thus no battery signal on the line
it switches that same dumb analog phone to the outside Analog trunk.  This
was the users can make and receive any emergency calls while the power is
out.

I have the basic concept of how this thing should work but not enough
knowledge of telephone electronics to build it.  I think this should be an
essential part of any PBX that supports analog lines and would be willing to
pay a reasonable price for it.

Next sort of on the same topic.  Does anyone have a diagram or know of some
where you can buy a single or dual port Cisco power inserter.  I want to put
the Power Adapter for my 7960 over on the UPS so that the phone on my desk
doesn't die right away when the power flickers or goes out.  My battery a
APC Back UPS Pro 650 holds the Asterisk server (Athlon 850 w/ 384 mb ram,
X100P, Netgear FA311 10/100, Kinkston 10mb ne2k-pci clone, S3 Savage clone
video, IBM 15GB, IBM 60GB, IBM 80GB IDE drives and four fans) Westtel DSL
modem, Netgear 10mb hub (outside interfaces), Intel Pro 8-port managed
switch (inside interfaces) for 25-30 minutes and that is usually enough for
the power company equipment to reset around here.

Thanks
---
Shawn L. Djernes, N0PEU
Djernes.org
shawn at djernes.org | sdjernes at telerama.com | sdjernes at earthlink.net
http://www.djernes.org
PH: (412)-257-3252
519 Washington Ave. #2, Bridgeville, PA, 15017, USA
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