[Asterisk-Users] Cheap PoE switches/injectors?

[asteriskstuff at ziplip.com]

Guys

Just to clarify REAL POE is 802.3af compliant, anything else and you're taking a risk with your kit!! (Cisco have something called inline power that is only 24v...but they're switching to 802.3af now).

P

> -----Original Message-----
> From: Kevin P. Fleming [mailto:kpfleming at backtobasicsmgmt.com]
> Sent: Monday, July 19, 2004, 2:02 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] Cheap PoE switches/injectors?
> 
> Greg Hill wrote:
> 
> > officially, a POE capable switch/etc is supposed to do a discovery routine
> > to detect, when a device is plugged into it, whether that device requires
> > POE. Right? And the single-port POE injectors are usually nothing more
> > than two RJ45 packs with a dc power connector, right? That could be the
> > difference in price there: the detection circuitry. Or am I way off?
> 
> No, even the single-port injectors have to have that circuitry, I 
> believe. Otherwise power on the extra pins would be live all the time, 
> which could be damaging to any non-PoE equipment you plugged in there. 
> Also, the PoE device itself wants to negotiate its power usage with the 
> power supplier, and if the injector didn't respond I don't know if the 
> PoE device would ever come up.
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