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Message |
Guest
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 Posted:
Tue Aug 23, 2005 3:25 pm Post subject:
PoE powered device connected to the not PoE switch |
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I design the Ethernet device that will be used mainly in PoE networks.
But I want to insert the addition power entry from external power
supplier to provide a possibility to use the same device in not-PoE
network. Is it possible to do? Will the PoE powered device compatible
to not-PoE switch and will it work in the case that I supply the power
from external PSU? |
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William P. N. Smith
Guest
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| Posted:
Tue Aug 23, 2005 4:20 pm Post subject:
Re: PoE powered device connected to the not PoE switch |
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mfeldchtein@hotmail.com wrote:
| Quote: | my device is POE
powered. I will connect it to not-POE switch and provide power from
external PCU, and I choose my device to be powered from this PSU
(disconnect POE module output from the circuit). At this time POE
module remaine to be connected to Ethernet lines and to switch that
does not work with POE. Does it work or produces a conflict between
switch and my device on ethrenet lines?
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Ah, I see your question now. If your PoE is 802.3af, then it will not
effect the non-PoE switch in any way. |
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James Knott
Guest
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| Posted:
Tue Aug 23, 2005 4:20 pm Post subject:
Re: PoE powered device connected to the not PoE switch |
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mfeldchtein@hotmail.com wrote:
| Quote: |
James Knott wrote:
mfeldchtein@hotmail.com wrote:
I design the Ethernet device that will be used mainly in PoE networks.
But I want to insert the addition power entry from external power
supplier to provide a possibility to use the same device in not-PoE
network. Is it possible to do? Will the PoE powered device compatible
to not-PoE switch and will it work in the case that I supply the power
from external PSU?
It strikes me odd, that you're able to design such a device and don't
know
about hooking up power supplies. This would be a trivial matter for
anyone
with experience designing electronic equipment. Yes, it is possible to
do that and in fact there are a couple of method that could be use.
James, I think you did not understood my question or I did not asked
correctly. the more qorrect question may be so: my device is POE
powered. I will connect it to not-POE switch and provide power from
external PCU, and I choose my device to be powered from this PSU
(disconnect POE module output from the circuit). At this time POE
module remaine to be connected to Ethernet lines and to switch that
does not work with POE. Does it work or produces a conflict between
switch and my device on ethrenet lines?
|
Again, if you're the designer, it should be a trivial problem. The two
methods are:
Use a tap, designed for injecting PoE power onto the line. This can be done
at either end.
Or, use a separate supply to the device and not use PoE. It's a very simple
problem. If you use a "wall wart" type power supply, the connector on your
device can disconnect the PoE power. |
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Guest
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| Posted:
Tue Aug 23, 2005 4:20 pm Post subject:
Re: PoE powered device connected to the not PoE switch |
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James Knott wrote:
| Quote: | mfeldchtein@hotmail.com wrote:
I design the Ethernet device that will be used mainly in PoE networks.
But I want to insert the addition power entry from external power
supplier to provide a possibility to use the same device in not-PoE
network. Is it possible to do? Will the PoE powered device compatible
to not-PoE switch and will it work in the case that I supply the power
from external PSU?
It strikes me odd, that you're able to design such a device and don't know
about hooking up power supplies. This would be a trivial matter for anyone
with experience designing electronic equipment. Yes, it is possible to do
that and in fact there are a couple of method that could be use.
|
James, I think you did not understood my question or I did not asked
correctly. the more qorrect question may be so: my device is POE
powered. I will connect it to not-POE switch and provide power from
external PCU, and I choose my device to be powered from this PSU
(disconnect POE module output from the circuit). At this time POE
module remaine to be connected to Ethernet lines and to switch that
does not work with POE. Does it work or produces a conflict between
switch and my device on ethrenet lines? |
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| Back to top |
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William P. N. Smith
Guest
|
| Posted:
Tue Aug 23, 2005 4:20 pm Post subject:
Re: PoE powered device connected to the not PoE switch |
|
|
mfeldchtein@hotmail.com wrote:
| Quote: | I design the Ethernet device that will be used mainly in PoE networks.
But I want to insert the addition power entry from external power
supplier to provide a possibility to use the same device in not-PoE
network. Is it possible to do? Will the PoE powered device compatible
to not-PoE switch and will it work in the case that I supply the power
from external PSU?
|
Why wouldn't it work? I'd just use the third pin (switch) of the
power connector to disconnect the output of the PoE supply and splice
in the external PSU.
It might be useful to disable the PoE supply entirely when using an
external PSU (to allow managed load-sensitive PoE sources to reduce
their total load), but you could probably do that with a switch if you
cared.
The power supply will be a bit more complicated than otherwise, but
that's a detail... |
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James Knott
Guest
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| Posted:
Tue Aug 23, 2005 4:20 pm Post subject:
Re: PoE powered device connected to the not PoE switch |
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|
mfeldchtein@hotmail.com wrote:
| Quote: | I design the Ethernet device that will be used mainly in PoE networks.
But I want to insert the addition power entry from external power
supplier to provide a possibility to use the same device in not-PoE
network. Is it possible to do? Will the PoE powered device compatible
to not-PoE switch and will it work in the case that I supply the power
from external PSU?
|
It strikes me odd, that you're able to design such a device and don't know
about hooking up power supplies. This would be a trivial matter for anyone
with experience designing electronic equipment. Yes, it is possible to do
that and in fact there are a couple of method that could be use. |
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Guest
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| Posted:
Wed Aug 24, 2005 8:20 am Post subject:
Re: PoE powered device connected to the not PoE switch |
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Thanks, it is a probably solution.
by the way, if I don't know somethink, it does not mean that I'm not
the designer, it simply means that I still did not met this task :):)
Thank you once more, best regards |
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William P. N. Smith
Guest
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| Posted:
Thu Aug 25, 2005 12:20 am Post subject:
Re: PoE powered device connected to the not PoE switch |
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mfeldchtein@hotmail.com wrote:
| Quote: | provide a possibility to use the same device in not-PoE
network.
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With the http://phihong.com/assets/pdf/PSA16U.pdf going for something
like $26.46 why not just source those for the occasional need? |
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