[Asterisk-Users] Re: Upgrade from Altigen

[Jay Milk]

If you're talking plain FXO/FXS ports (as in two-wire CO lines, not T1
or anything fancy), go LOW tech:

Pick up a DPDT relay with 12V or 5V coil-voltage from your favorite
electronics outlet (allelectronics, jameco, etc), and hook it up like
so:

      Phone
        | 
       / \
    FXS   FXO/CO

When the coil is energized, the phone will be connected to the FXS port;
when power is absent, the phone will be connected to the CO-line (which
is still connected to the FXO port on your PBX.  Now connect the coil to
the appropriate power on your PBX computer... When the computer is on,
the phone is an extension on the PBX; when the computer is off, your
phone is connected directly to the CO line for emergencies.

I have this working on my home-PBX w/o a problem; the relay cost me $2
or $3 incl. shipping (with some other parts), the connectors were strewn
about my office.

> -----Original Message-----
> From: Geoff Nordli [mailto:geoffn at gnaa.net] 
> Sent: Tuesday, July 27, 2004 10:21 PM
> To: asterisk-users at lists.digium.com
> Subject: RE: [Asterisk-Users] Re: Upgrade from Altigen
> 
> 
> > -----Original Message-----
> > From: asterisk-users-admin at lists.digium.com
> > [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> > James H. Thompson
> > Sent: Tuesday, July 27, 2004 7:38 PM
> > To: asterisk-users at lists.digium.com
> > Subject: Re: [Asterisk-Users] Re: Upgrade from Altigen
> > 
> > > 
> > > Thanks Jim.
> > > 
> > > Does anyone think that the Altigen has this feature
> > built-in or might they
> > > have a device similar to the Power Fail Bypass installed?
> > > 
> > 
> > The Altigen web site has technical manuals online.
> >     http://www.altigen.com/customer_tech-manuals.html
> > It would appear that the power failure transfer feature is
> > part of their hardware.
> > I believe that in some places there are legal requirements 
> > that some ability to call emergency
> > services remain during a power failure.
> > 
> > 
> > Jim
> > 
> > James H. Thompson
> > jht at lava.net
> > 
> 
> Thanks Jim.  I found the info in the guide.  Apparently upon 
> failure the card will automatically switch an incoming trunk 
> to the first extension on the card.  
> 
> So this brings me to find a similar solution.  I noticed that 
> VoiceTronix OpenSwitch has this to say on their site:
> 
> Phones Function on Power or PC Failure
>     * Loop-Start ports switch through to Station ports on 
> power or PC failure to preserve basic telephone functionality.
>     * This by-pass mechanism connects the external PSTN lines 
> to telephone handsets on station ports.
>     * A watch-dog timer triggers the by-pass mechanism on PC failure.
> 
> >From how I read this the card will provide failover the to the FXS 
> >devices.
> There is no documentation on the web site.  Can some expand 
> on how this works?  I assume that I can manually configure 
> FXO to FXS mapping. 
> 
> It doesn't look like the Digium hardware supports this 
> feature.  Is that right?
> 
> Geoff
> 
> 
> 
> 
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