[VoIP] Power backup questions

[Doug Alderdice]

At 05:28 PM 10/31/2006 -0500, Jayson Smith wrote:
>Do more expensive UPS's either not beep as often or have an option to turn 
>beeping
>off, at least until the battery is low?

As Steph noted, the ones with which I have had contact have an alarm 
silencing switch, to acknowledge the condition.  Mine, after being silenced 
for the initial outage, will then beep when the battery level is 
approaching cutoff.

>I think the Dlink router uses five volts, probably DC.  No idea about the
>DSL modem.  Guess we'd have to take a voltmeter to those transformers if we
>wanted to cobble together a charger.

I just looked at the labels on the wall worts for my DSL modem, router and 
small 8-port switch.  The DSL modem and router's wall worts have AC output, 
the switch's is DC.  One is 12VAC, another 9VAC and the DC one is 9V.  Most 
likely the router and modem's power inputs go right to a bridge rectifier, 
filtering and DC regulation, but without actually opening them up and 
attempting to trace out the circuit, one can't be certain they aren't using 
the AC for something, which makes the direct battery power option not as 
easy as it might be at first glance.  I had thought of the direct power 
route myself during our recent extended outage here but when I saw the AC 
inputs on two of the devices I decided against exploring that further at 
the time.

Doug.