[Asterisk-Users] Cheap PoE switches/injectors?

[Jonathan Moore]

Some certainly are dumb power. For instance the Linksys POE modules. I wasn't
aware of that being an issue with the 3com module. The way to know for sure is
to ask if it supports 802.3af which is the standard that includes the
autodetection to pretect non-POE equipment.

....

Did a quick search and it looks like you are correct about the 3com single line
injectors, which does indeed explain the price differential.


-- 
Jonathan Moore
Director of Technology
Winfield Public Schools
Office 620.221.5100
Fax 620.221.0508


Quoting Greg Hill <gregh-asterisk at hillnet.us>:

> On Mon, 19 Jul 2004, Kevin P. Fleming wrote:
> 
> > Scott Laird wrote:
> >
> > > So $1600 for 24 ports.  That's not *too* bad.  HP seems to have a
> > > similar model (2626-PWR) for a similar price.  3com also seems to have a
> > > 24-port injector for $800.
> >
> > I still don't understand why I can buy single-port injectors for $20,
> > but multi-port models are $30 per port and up. You'd think that having a
> > single combined power supply and other bits would reduce the cost, not
> > increase it.
> 
> 
> 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?
> 
> Greg
> 
> 
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