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  #1 (permalink)  
Old 11-02-2005, 09:26 PM
mmanning
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Default Can a non POE switch pass POE?

So I am looking to implement power over Ethernet for the office, I was
looking at the Dell PowerConnect 3448P which supplies POE to all 48
ports, the question now is, if I setup a Dell NON-POE Switches
in-between the POE device and the POE switch mentioned above, will the
POE device receive the power, or will it be discarded by the NON-POE
switch.

Thanks in advance,
Marcel


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  #2 (permalink)  
Old 11-02-2005, 10:24 PM
youcantoo
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Default Re: Can a non POE switch pass POE?

mmanning wrote:
> So I am looking to implement power over Ethernet for the office, I was
> looking at the Dell PowerConnect 3448P which supplies POE to all 48
> ports, the question now is, if I setup a Dell NON-POE Switches
> in-between the POE device and the POE switch mentioned above, will the
> POE device receive the power, or will it be discarded by the NON-POE
> switch.
>
> Thanks in advance,
> Marcel
>

You will probably find that it will not work

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  #3 (permalink)  
Old 11-02-2005, 11:04 PM
mmanning
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Default Re: Can a non POE switch pass POE?

I called Dell and asked them and they did not know and said they would
have an engineer call me in a few days, do they know anything about
what they sell?


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  #4 (permalink)  
Old 11-02-2005, 11:15 PM
Dmitri
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Default Re: Can a non POE switch pass POE?

mmanning wrote:

> So I am looking to implement power over Ethernet for the office, I was
> looking at the Dell PowerConnect 3448P which supplies POE to all 48
> ports, the question now is, if I setup a Dell NON-POE Switches
> in-between the POE device and the POE switch mentioned above, will the
> POE device receive the power, or will it be discarded by the NON-POE
> switch.


Absolutely not going to work. Most non-POE switches not only fail to pass
the power, but they even make things worse by shortening unused pairs 1
and 4 and connecting them to the ground. The power will not even be
applied to a cable that goes to a non-POE switch to begin with.

-------------------------------------
--
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http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
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http://www.cabling-design.com/homecabling
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  #5 (permalink)  
Old 11-03-2005, 02:06 AM
William P.N. Smith
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Default Re: Can a non POE switch pass POE?

"mmanning" <mmanning@nexgentec.com> wrote:
>So I am looking to implement power over Ethernet for the office, I was
>looking at the Dell PowerConnect 3448P which supplies POE to all 48
>ports, the question now is, if I setup a Dell NON-POE Switches
>in-between the POE device and the POE switch mentioned above, will the
>POE device receive the power, or will it be discarded by the NON-POE
>switch.


The power will not even be turned on by the 3448P unless it sees a PoE
'client' at the other end of the wire, and since the other switches
aren't PoE, nothing will happen.

Besides, a PoE supply port can only supply one device, did you expect
it to power all the devices hanging off the other switch?

[You could probably hack something up that would work by bypassing the
appropriate pairs around the Non-PoE switch to a single output port,
but that would only work with one of the two flavors of PoE...]

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  #6 (permalink)  
Old 11-03-2005, 01:06 PM
Derek Broughton
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Default Re: Can a non POE switch pass POE?

mmanning wrote:

> I called Dell and asked them and they did not know and said they would
> have an engineer call me in a few days, do they know anything about
> what they sell?


LOL. Absolutely not...
--
derek

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  #7 (permalink)  
Old 11-03-2005, 02:12 PM
William P.N. Smith
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Default Re: Can a non POE switch pass POE?

"mmanning" <mmanning@nexgentec.com> wrote:
>I called Dell and asked them and they did not know and said they would
>have an engineer call me in a few days, do they know anything about
>what they sell?


Well, to be fair, you don't know what PoE is or how it's used, don't
you know anything about what you are buying?

[Yeah, Dell should know, but I'm not surprised to learn that their
salesdroids don't know everything about every product they sell. In
fact, I'd never trust them to answer an important question about
required functionality properly either. Do your research (yes, you
are by asking here) and know what you want before you buy from Dell or
anyone.]

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  #8 (permalink)  
Old 11-07-2005, 06:40 PM
mmanning
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Default Re: Can a non POE switch pass POE?

I did some minimial research, I am just looking to power about 6 access
points throughout the building and thought that would be the best bet,
but since it does not pass the power obviously it would no be the best
solution when I can just use power injectors for alot less money.

Thanks for everyones response,
Marcel


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  #9 (permalink)  
Old 11-08-2005, 02:34 AM
William P.N. Smith
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Default Re: Can a non POE switch pass POE?

"mmanning" <mmanning@nexgentec.com> wrote:
>I am just looking to power about 6 access
>points throughout the building


Yeah, get 6 PoE single-port injectors from PhiHong and put them on the
ports you need PoE, and save a ton of money.

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