PoE Support for Plan9 on RPI 4B/3B+?

PoE Support for Plan9 on RPI 4B/3B+?

[barrywasdell]

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I have four Raspberry Pi model 4B boards and a Raspberry Pi model 3B+
board and would like to know whether or not Power over Ethernet (PoE) is
supported by the Pi9 port.

Has anyone attempted to power a Plan9 cluster/grid over PoE? What PoE
network switches would you recommend? Were there any issues? Richard
Miller?

To be clear, a PoE network enables boards to be powered over an Ethernet
network if a side-board (HAT) is connected. [1] A PoE network switch
conforming to IEEE 802.3af delivers power through the each Pi's RJ45
network connector over Cat 5 cabling. [2]

To my knowledge, neither the 9front kernel sources nor the documented
list of supported hardware, specifically mentions PoE. [3] It seems the
network switch and HAT negotiate power delivery independently of the
kernel so I cannot think of a reason why Plan9 would not support
powering this way.

References
[1]: https://www.raspberrypi.org/blog/introducing-power-over-ethernet-poe-hat/
[2]: https://ieeexplore.ieee.org/document/1213877
[3]: https://9p.io/wiki/plan9/Supported_PC_hardware/index.html

--
Barry Wasdell (bwasd)

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Re: [9fans] PoE Support for Plan9 on RPI 4B/3B+?

[Skip Tavakkolian]

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The PoE hat shouldn't need any software support. I don't have one, but it's
basically a DC-DC converter. The Pi PoE hat has an Attiny processor for
temperature sensing/fan operation.

You can also use a PoE splitter (48V->5V/2.4A micro USB) which would work
for all Pi's.

-Skip


On Mon, Mar 23, 2020 at 12:16 PM <barrywasdell@gmail.com> wrote:

> I have four Raspberry Pi model 4B boards and a Raspberry Pi model 3B+
> board and would like to know whether or not Power over Ethernet (PoE) is
> supported by the Pi9 port.
>
> Has anyone attempted to power a Plan9 cluster/grid over PoE? What PoE
> network switches would you recommend? Were there any issues? Richard
> Miller?
>
> To be clear, a PoE network enables boards to be powered over an Ethernet
> network if a side-board (HAT) is connected. [1] A PoE network switch
> conforming to IEEE 802.3af delivers power through the each Pi's RJ45
> network connector over Cat 5 cabling. [2]
>
> To my knowledge, neither the 9front kernel sources nor the documented
> list of supported hardware, specifically mentions PoE. [3] It seems the
> network switch and HAT negotiate power delivery independently of the
> kernel so I cannot think of a reason why Plan9 would not support
> powering this way.
>
> References
> [1]:
> https://www.raspberrypi.org/blog/introducing-power-over-ethernet-poe-hat/
> [2]: https://ieeexplore.ieee.org/document/1213877
> [3]: https://9p.io/wiki/plan9/Supported_PC_hardware/index.html
>
> --
> Barry Wasdell (bwasd)
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Re: [9fans] PoE Support for Plan9 on RPI 4B/3B+?

[Chris McGee]

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I can vouch for the fact that the Pi 1,2 and 3 work fine with a simple 12W
10/100 PoE network/power splitter. They work fine with 9front as it is
mostly transparent to the OS as far as I can tell.

Chris

On Mon, Mar 23, 2020 at 5:23 PM Skip Tavakkolian <skip.tavakkolian@gmail.com>
wrote:

> The PoE hat shouldn't need any software support. I don't have one, but
> it's basically a DC-DC converter. The Pi PoE hat has an Attiny processor
> for temperature sensing/fan operation.
>
> You can also use a PoE splitter (48V->5V/2.4A micro USB) which would work
> for all Pi's.
>
> -Skip
>
>
> On Mon, Mar 23, 2020 at 12:16 PM <barrywasdell@gmail.com> wrote:
>
>> I have four Raspberry Pi model 4B boards and a Raspberry Pi model 3B+
>> board and would like to know whether or not Power over Ethernet (PoE) is
>> supported by the Pi9 port.
>>
>> Has anyone attempted to power a Plan9 cluster/grid over PoE? What PoE
>> network switches would you recommend? Were there any issues? Richard
>> Miller?
>>
>> To be clear, a PoE network enables boards to be powered over an Ethernet
>> network if a side-board (HAT) is connected. [1] A PoE network switch
>> conforming to IEEE 802.3af delivers power through the each Pi's RJ45
>> network connector over Cat 5 cabling. [2]
>>
>> To my knowledge, neither the 9front kernel sources nor the documented
>> list of supported hardware, specifically mentions PoE. [3] It seems the
>> network switch and HAT negotiate power delivery independently of the
>> kernel so I cannot think of a reason why Plan9 would not support
>> powering this way.
>>
>> References
>> [1]:
>> https://www.raspberrypi.org/blog/introducing-power-over-ethernet-poe-hat/
>> [2]: https://ieeexplore.ieee.org/document/1213877
>> [3]: https://9p.io/wiki/plan9/Supported_PC_hardware/index.html
>>
>> --
>> Barry Wasdell (bwasd)
>>
> *9fans <https://9fans.topicbox.com/latest>* / 9fans / see discussions
> <https://9fans.topicbox.com/groups/9fans> + participants
> <https://9fans.topicbox.com/groups/9fans/members> + delivery options
> <https://9fans.topicbox.com/groups/9fans/subscription> Permalink
> <https://9fans.topicbox.com/groups/9fans/Td562795dfef0ca48-M545d21f977f3c5473cd8edc6>
>

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