asterisk users - Apr 2005 - Digium TDM400 Failover on Power Loss

I know there are work-arounds for this, but I'm going to ask anyway.

I'm looking for a way to automatically failover a TDM422B (2FXO, 2FXS)
when the power dies.

This is again for a rather paranoid client.

Options so far:
- I will be installing a redundant power box in the server with a UPS.
- Wire the FXO to a double-throw switch by hand so if power dies the
client can just flick the switch over from the Asterisk box to the
analogue phone.

I know the Sipura-3000 will automatically do this, but obviously a
computer cannot set this up on the PCI card with it's last dying gasp for
power.

Is there any other way this can be done - especially if the box sits in a
room in the basement which is not easily accessible during a power cut, so
the customer doesn't really want to go down there to flick the switch
"override"

Appreciate your help.

Mike

I'd use a relay in place of the switch. When the relay is energized,
the POTS lines are connected to the server, when the relay is
de-energized (power fail) the relay is connected to the power fail
phone.

A good selection of relays can be found at:

http://www.allelectronics.com

Bill 

On Apr 7, 2005 2:21 AM, Mike Sander
<mike@corporatebankinginternational.com> wrote:
> I know there are work-arounds for this, but I'm going to ask anyway.
> 
> I'm looking for a way to automatically failover a TDM422B (2FXO, 2FXS)
> when the power dies.
> 
> This is again for a rather paranoid client.
> 
> Options so far:
> - I will be installing a redundant power box in the server with a UPS.
> - Wire the FXO to a double-throw switch by hand so if power dies the
> client can just flick the switch over from the Asterisk box to the
> analogue phone.
> 
> I know the Sipura-3000 will automatically do this, but obviously a
> computer cannot set this up on the PCI card with it's last dying gasp
for
> power.
> 
> Is there any other way this can be done - especially if the box sits in a
> room in the basement which is not easily accessible during a power cut, so
> the customer doesn't really want to go down there to flick the switch
> "override"
> 
> Appreciate your help.
> 
> Mike
> 
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This site has what you need and some other products that might also work
http://www.gkinc.com/OverviewUT8.htm

They will sell direct to you. I haven't purchased yet but I intent to use
them for the same reason. You could trigger off the computers power supply
so turning off the server flips the lines over to standby handsets.

Chris

What are the best companies to use with an asterisk PBX box?  We are a
linux shop and we want to implement VOIP using asterisk.  I would like
to hear pros and cons about each company.

Thanks,


GM