asterisk users - Nov 2004 - How to make/recieve call using asterisk when thereis a power failure?

Sorry I dont have any answers, however I do have a question.
 
I was told that ISDN-30 lines do not work during power failure.  Can
anyone with some better knowledge confirm or deny this?
Is this because the ISDN-30 box on the wall requires power (and Telco
providers just dont hook them into UPS as standard)?
Or do they mean if your local circuit has lost power so will the local
digital exchange that provides your ISDN-30?
 
 
My experience from customers has been that none of their current phone
solutions worked with power loss so they dont care (not enough to pay
the extra).  Considering the prolification of mobile phones for
emergancy calls during power outages I would agree.
 
my 2p.
 

	-----Original Message-----
	From: TinKoon [mailto:tinkoon@lga.net.sg] 
	Sent: 25 November 2004 09:57
	To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
	Subject: [Asterisk-Users] How to make/recieve call using
asterisk when thereis a power failure?
	
	

	Hi,

	 

	I am supportive of the asterisk, but I have some concern, though
the concern also applies to traditional pbx as well. Hope someone can
shine some light into it. Thanks.

	 

	<SNIP> 



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On Thu, 25 Nov 2004, Alex Barnes wrote:
> Sorry I dont have any answers, however I do have a question.
>  
> I was told that ISDN-30 lines do not work during power failure.  Can
> anyone with some better knowledge confirm or deny this?
> Is this because the ISDN-30 box on the wall requires power (and Telco
> providers just dont hook them into UPS as standard)?
> Or do they mean if your local circuit has lost power so will the local
> digital exchange that provides your ISDN-30?
They work just fine if your pstn provider is at all serious. If not, 
switch. They don't belong in the pstn business anyway.

An E1 termination can require local power. In that case you will have to 
provide backup power to it. Some get their power from the central office, 
in which case this is not a problem.
> My experience from customers has been that none of their current phone
> solutions worked with power loss so they dont care (not enough to pay
> the extra).  Considering the prolification of mobile phones for
> emergancy calls during power outages I would agree.
Man, you must have nice and quiet customers. 

During a large power outage not too long ago (the first one in many years) 
our primary network connectivity went down after a while but the E1 isdn 
phone line was working the whole time. 

Peter

>We use several Dell 2650 servers.  Order them with the dual DC
power supply option.

 > Buy a row of -48 batteries and a -48 power source, your servers will stay
up for hours. 
 
That's only half of the solution. How will the phones be powered? Some
thoughts:
 
-If your power is iffy and you know it will go out, install a positive
interlock at the main breaker panel for those breakers responsible for your
servers. Then, get ye to the home reno store and buy a 2kw generator. When
the power goes out, the sequence is like this:
 
Power goes out > UPS keeps up servers > You start the generator >
Interlock
switches from mains to generator > UPS "thinks" power is back
 
About $400 for the interlock and, say, $1200 for the generator
 
-Midspan POE injector will keep up your phones if it is UPS'ed as above.
Some phones suck a lot of power. My 3Com midspan injector is 200W with 24
ports, but I can only use 15 of those for my Mitel 5220's before the
injector shuts down. The 5220's take 14 W at a time! 
 
$900 for the injector
 
-A small UPS for each phone would work, they are very inexpensive these days
and should keep a phone running for a few hours. 
 
$29 at Costco X # of phones
 
-We have a disaster recovery plan with our telco filed. When our T1 goes
out, we call a certain number (by cell of course!) and say: "Enable the
plan" and they re route our DID's to cell numbers. This is a software
change
on their end and it takes a few minutes.  This will vary by carrier, of
course. Ours (Allstream / AT & T) are really good to work with. The ILEC,
Telus? Not so much. 
 
 
 

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