[asterisk-users] Cisco power injector with GXP2000 phones

[Salvatore Giudice]

I forgot to answer your other question.

I don't have the pin outs, but the way cisco proprietizes the POE injector
involves reversing the polarity carried on the cable. Literally, two pins
are switched going into and coming out of the POE injetcor. You could use a
cisco poe injector with 2 custom Ethernet cables that crossover those two
pins to correct the polarity difference. You should be able to figure out
which pins cisco uses with a cheap amp meter form radioshack.

There are also a lot of generic poe adapters out there that will work fine
with you GXP2000/asterisk setup.

--------------------------------------------------
Salvatore Giudice
Salvatore.Giudice at VoIPSecurityTraining.com

VoIP Security Training, LLC
http://VoIPSecurityTraining.com

848 N. Rainbow Blvd. #1676
Las Vegas, NV 89107
Phone: (617) 959-7625
Fax: (214) 279-2906


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jon Pounder
Sent: Thursday, December 06, 2007 10:45 AM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Cisco power injector with GXP2000 phones

Quoting Salvatore Giudice <Salvatore.Giudice at VoIPSecurityTraining.com>:

> The electricity is carried on different pins in a cisco poe injector. Just
> because they both support the same standard doesn't mean they were
> implemented the same.
>

I didn't even know the gxp2000's could handle poe - anyone care to  
share what voltage/current they expect on what pins ?

even if I could just move the existing powersupplies back to the  
punchdown panel that would unclutter desks and make centralizing ups  
power that much simpler.





>
>
> --------------------------------------------------
> Salvatore Giudice
> Salvatore.Giudice at VoIPSecurityTraining.com
>
> VoIP Security Training, LLC
> http://VoIPSecurityTraining.com
>
> 848 N. Rainbow Blvd. #1676
> Las Vegas, NV 89107
> Phone: (617) 959-7625
> Fax: (214) 279-2906
>
>
>
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Ricardo
> Carvalho
> Sent: Thursday, December 06, 2007 10:19 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [asterisk-users] Cisco power injector with GXP2000 phones
>
>
>
> I've tried to use a Cisco power injector to supply power over Ethernet to
a
> GXP2000 phone without success. Although when I plugged these phone to a
PoE
> capable Cisco Switch it worked without a problem!
>
> Knowing that all these three equipments implement IEEE 802.3af protocol,
why
> doesn't it work with the Cisco power injector? Anyone also had this
problem
> before?
>
> Thanks,
> Ricardo Carvalho.
>
>



Jon Pounder

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