[VoIP] Power backup questions

[Chad Perkins]

Speaking of wall warts, I was pleasantly surprised to find the wall wart for my new 
Netgear FS108P is 48 VDC.

The FS108P is Netgears Power Over Ethernet (POE) version of their eight port fast 
Ethernet switch (the FS108) and I think is their smallest POE offering.  Now one wall 
wart on my UPS powers not only the LAN here at the house, but my POE IP phones 
as well.

By the way, if anyone cares the FS108P which is an IEEE 802.af standard PSE 
device, will power pre-802.af Cisco 7900 IP phones via a FULL and PROPER 
Ethernet crossover cable (that fixes the 802.af standard problem being on the right 
pins, and the Netgear automatically handles the crossover by autocrossing itself).

Chad

> 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.
> 
> 
> 
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