[Asterisk-Users] POTS fail-over?

[Jay Milk]

Good point, but probably overkill again, as my requirements are simple:
I'm aiming to replace my home-PBX; I work at home, so the odds of me not
being around when this happens are low.  And if the power goes out and
the wife's alone, she also has a cell-phone available.  I'd rather have
the thing recover without intervention and risk being disconnected.
Power doesn't go out more than once a month, and only once in the two
years we lived here did it last long enough for the UPSs shut down my
computers.

If someone's interested in the reset-button, you're correct, it's very
easy: The relay I've been looking at is a 4PDT type.  To switch one
line, I only need two of the four switches.  I'll power the coil through
one of the NO contacts and then bypass that contact with a momentary
switch.  When you first apply power, the relay remains powerless.  Once
you hit the momentary switch, the relay latches and the extra contact
continues to power the coil when you release the switch & everyone's
happy.

Breaking out my trusty PIC programmer, I could probably do line-voltage
detection and automatically latch the relay once the incoming line is
idle... But like I said, overkill for my app :)

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Shane Young
Sent: Wednesday, April 28, 2004 1:37 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] POTS fail-over?


Quoting Jay Milk <jay at skimmilk.net>:

> Thank you -- looks like overkill for my app.  Found me a 4PDT relay 
> operating on 5V for $5.50 -- This will allow me to switch two lines 
> onto two extensions, if needed, and I can run it off a 5V lead in the 
> server... Server off => Landline rings extension... And extension 
> available for 911, just in case.

I've done this as well several times before.  Many PBX's have the very
same functionality built 
in.  The annoying thing is when you are on a call in "power fail" mode
and the power is restored, 
disconnecting your call in progress.

The Viking power fail unit will wait for you to complete the call before
restoring the "normal" 
condition on the line.  

With a little effort, you could do something similar with a relay,
perhaps requring you to hit 
a "reset" button to get it to re-latch.


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