asterisk users - Jul 2004 - Cheap PoE switches/injectors?

I'm trying to spec out hardware for a new office, and I'd like to 
include power over Ethernet as an option.  I've seen a handful of PoE 
injectors around $1000 for 24 ports and a couple switches up around 
$2500 for 24 ports.  Are there any cheaper options, short of buying a 
boatload of 1-port injectors off of ebay?  I don't really need more 
then 24 ports of PoE out of 48 total ports, so one of CIsco's big PoE 
switches is complete overkill.  This is for a startup, where cheap is 
important.

Thanks.


Scott

Look out for 3c17205 switches from 3com and read the QOS thread posting here at
the moment.

P
> -----Original Message-----
> From: Scott Laird [mailto:scott@sigkill.org]
> Sent: Monday, July 19, 2004, 7:58 AM
> To: 'asterisk-users@lists.digium.com'
<asterisk-users@lists.digium.com>
> Subject: [Asterisk-Users] Cheap PoE switches/injectors?
> 
> I'm trying to spec out hardware for a new office, and I'd like to 
> include power over Ethernet as an option.  I've seen a handful of PoE 
> injectors around $1000 for 24 ports and a couple switches up around 
> $2500 for 24 ports.  Are there any cheaper options, short of buying a 
> boatload of 1-port injectors off of ebay?  I don't really need more 
> then 24 ports of PoE out of 48 total ports, so one of CIsco's big PoE 
> switches is complete overkill.  This is for a startup, where cheap is 
> important.
> 
> Thanks.
> 
> 
> Scott
> 
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You can pick up 3c17205's on ebay for usually around $500-$700 new in the
box (non on there at the moment).

They come up about 3-4 a month although it's summer at the moment so a bit
quiet.

P
> -----Original Message-----
> From: Scott Laird [mailto:scott@sigkill.org]
> Sent: Monday, July 19, 2004, 11:42 AM
> To: asterisk-users@lists.digium.com
> Subject: Re: [Asterisk-Users] Cheap PoE switches/injectors?
> 
> 
> On Jul 19, 2004, at 9:03 AM, asteriskstuff@ziplip.com wrote:
> 
> > Look out for 3c17205 switches from 3com and read the QOS thread 
> > posting here at the moment.
> >
> 
> 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.
> 
> 
> Scott
> 
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You're spot on!!

802.3af has all kinds of protection circuitary built in.

P
> -----Original Message-----
> From: Greg Hill [mailto:gregh-asterisk@hillnet.us]
> Sent: Monday, July 19, 2004, 1:28 PM
> To: asterisk-users@lists.digium.com
> Subject: Re: [Asterisk-Users] Cheap PoE switches/injectors?
> 
> 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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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@backtobasicsmgmt.com]
> Sent: Monday, July 19, 2004, 2:02 PM
> To: asterisk-users@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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Jonathon

Ebay items:-

5710513834
5710609468

P
> -----Original Message-----
> From: Jonathan Moore [mailto:moorejon@usd465.com]
> Sent: Tuesday, July 20, 2004, 12:09 AM
> To: asterisk-users@lists.digium.com
> Subject: Re: [Asterisk-Users] Cheap PoE switches/injectors?
> 
> Has anyone tried the new dlink powered switches? I remember seeing an
online
> voip store selling these as a good option for providing power in a voip
> application. They were price at 1100 for a 24 port model. 
> 
> 
> 
> The lowest cost solution I have seen are the individual 3com power
injectors
> which can be had for between $16-$25. I have done some minimal testing with
> one
> for use with wireless access points and it seems workable, although not a
good
> solution for a high density environment.
> 
> -- 
> Jonathan Moore
> Director of Technology
> Winfield Public Schools
> Office 620.221.5100
> Fax 620.221.0508
> 
> 
> Quoting Scott Laird <scott@sigkill.org>:
> 
> > 
> > On Jul 19, 2004, at 9:03 AM, asteriskstuff@ziplip.com wrote:
> > 
> > > Look out for 3c17205 switches from 3com and read the QOS thread 
> > > posting here at the moment.
> > >
> > 
> > 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.
> > 
> > 
> > Scott
> > 
> > _______________________________________________
> > Asterisk-Users mailing list
> > Asterisk-Users@lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-users
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> >    http://lists.digium.com/mailman/listinfo/asterisk-users
> > 
> 
> 
> Visit Winfield Public Schools at http://usd465.com
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