[Elphel-support] POE card in custom enclosure?

Tue Jun 14 10:30:12 PDT 2011

---------- Forwarded message ----------
From: Andrey Filippov <support-list at support.elphel.com>
Date: Tue, Jun 14, 2011 at 11:29 AM
Subject: Re: [Elphel-support] POE card in custom enclosure?
To: Nathan Clark <nathan at nathanclark.com.au>

On Tue, Jun 14, 2011 at 9:37 AM, Nathan Clark <nathan at nathanclark.com.au>wrote:

> Andrey,
>
> Thanks for your insight! That sounds really quite cool!
> A few questions (and please forgive my ignorance)
>
> I am using the 12v model elphel 353's- I would like to set up my box
> without needing a customized PCB...
> would it be possible to use your method and connect directly to one of the
> molex's coming straight from a 12v DC PSU?
>

Nathan, why not? The idea was just to minimize number of internal connectors
where disconnection/reconnection is not needed for normal operation. With
the internal wiring it is sufficient that you can disconnect the cameras
themselves from the cables.

>
> Also, can you tell me how you powered the switch? was it on the same power
> as the rest of the assembly, or did you have to power multiple inputs, one
> for the switch & one for everything else?
>
The "data storage box" has cradles for the HDD/SDD, so it has a power supply
with +5V and +12V (in addition to 48VDC for the cameras). So the switch was
powered from the 12VDC (it is a combined 5/12VDC unit)

>
> Finally, I'd love to know which switch you used.
>

We used Netgear GS105

>
> Once again, please forgive my ignorance I am not savvy with electronics and
> your valuable knowledge is highly appreciated!
>

thank you for the nice words,

Andrey

>
> Thanks,
>
> Nathan
>
>
>
>
> On Wed, Jun 15, 2011 at 1:15 AM, Andrey Filippov <
> support-list at support.elphel.com> wrote:
>
>> Nathan, Sebastian,
>>
>> I can tell you how it is done in the Eyesis (it uses regular 48V, 36-72V
>> input). In order to reduce number of the connectors inside the camera (and
>> connectors are the most likely to fail components so just the network
>> connector on the NC353 camera can be a source of interruptions) we ordered
>> custom modified cables - the cables are cut open near the other (opposite to
>> the camera) connector (~10cm from the end), the two non-signal pairs are
>> separated from the RJ45 connector, extended anothe 10cm and a 2-pin Molex
>> Microfit-3 connectors are attached. Then, inside the "data storage box"
>> these connector plugs go the the 48V DC connectors on the PCB there, while
>> RJ45 (with only 2 pairs left) go to a small 5-port GigE switch. While the
>> cameras are 100Mbps, usage iof Gigabit switch makes sense - the single
>> (gigabit) downstream cable going out of the switch can handle 3 attached
>> cameras without slowing them down when they are  working in parallel.
>>
>> Andrey
>>
>>
>>
>> On Tue, Jun 14, 2011 at 5:11 AM, Sebastian Pichelhofer <
>> sebastian.pichelhofer at gmail.com> wrote:
>>
>>> I guess it would work If the voltage range matches.
>>>
>>> What about 2 of these?
>>>
>>> http://www.optimal-microsystems.com/store/product_info.php?cPath=37&products_id=187&osCsid=d1c5619458c4128fa95f8e62d04adad5
>>>
>>> I assume your router will be inside the custom enclosure so these have
>>> the advantage that only the connectors that go to the cameras are on
>>> the outside surface of the custom enclosure and the cables inside the
>>> enclosure can be routed easier.
>>>
>>> Regards Sebastian
>>>
>>> On Tue, Jun 14, 2011 at 13:03, Nathan Clark <nathan at nathanclark.com.au>
>>> wrote:
>>> > Hi Sebastian,
>>> >
>>> > I certainly could put the current power injectors- as supplied from
>>> elphel-
>>> > within the box. Although this would be a bit of a hack.
>>> > I am hoping to construct a more "finished" device. It would be very
>>> nice, by
>>> > design, to have neatly placed I/O ethernet ports properly embedded into
>>> the
>>> > assembly!
>>> > Admittedly it is total "Overkill"... (the whole project is really)- but
>>> > would it still work?
>>> >
>>> > Cheers,
>>> >
>>> > Nathan
>>> >
>>> >
>>> > On Tue, Jun 14, 2011 at 8:41 PM, Sebastian Pichelhofer
>>> > <sebastian.pichelhofer at gmail.com> wrote:
>>> >>
>>> >> Hi Nathan
>>> >>
>>> >> Your cameras run on 12-36V and you should have the power injector
>>> >> adapter cable right?
>>> >> For this you would not need any PCB or circuit at all to inject the
>>> >> power its simply connecting certain pins of the Ethernet cable to the
>>> >> voltage.
>>> >>
>>> >> The link you provided states: "is an adaptor that eliminates the need
>>> >> to run high voltage power 110VAC to remote wireless access in order to
>>> >> power RF transmitters/receivers" so I think that's clearly an overkill
>>> >> ;)
>>> >>
>>> >> Couldn't you just place the 2 injector cable adapters inside your
>>> >> custom enclosure and wire both of them to a single battery with a
>>> >> Y-power splitter cable?
>>> >>
>>> >> Regards Sebastian
>>> >>
>>> >> On Tue, Jun 14, 2011 at 12:30, Nathan Clark <
>>> nathan at nathanclark.com.au>
>>> >> wrote:
>>> >> > Hi guys,
>>> >> >
>>> >> > I am planning to construct an enclosure to house peripherals
>>> attached to
>>> >> > my
>>> >> > elphel cameras.
>>> >> > This way I have everything I need in one neat box which can be
>>> powered
>>> >> > from
>>> >> > a single PSU- making the setup easier to manage in various
>>> situations.
>>> >> > Additionally, I would also like to use this box to have 2x POE
>>> injectors
>>> >> > contained within- further simplifying the design of the camera rig.
>>> >> >
>>> >> > I am hoping someone could have a look at the following component,
>>> and
>>> >> > confirm whether or not it would be appropriate.
>>> >> >
>>> >> > INJECTOR-PS48 -
>>> http://www.eidusa.com/Electronics_Kits_PoE_injector.htm
>>> >> >
>>> >> > or if it is not the right component, is there something you could
>>> >> > recommend?
>>> >> >
>>> >> > thanks for your time,
>>> >> >
>>> >> > Nathan
>>> >> >
>>> >> > PS. you can follow the progress of this project at the Apertus
>>> forum.
>>> >> > http://cinema.elphel.com/forums/viewtopic.php?f=4&t=108
>>> >> >
>>> >> > _______________________________________________
>>> >> > Support-list mailing list
>>> >> > Support-list at support.elphel.com
>>> >> >
>>> >> >
>>> http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
>>> >> >
>>> >> >
>>> >
>>> >
>>>
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>>>
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>>>
>>
>>
>
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