rsdavis
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POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 11:12 am

I tried to purchase a POE Hat from Allied Electronics and they said the Raspberry Pi POE Hat has been quarantined by your organization due to issue with part. I purchased three from same company just a week earlier and they shipped but I have not used them yet. What is wrong with the hardware assuming the company is right on this and is this a safety issue.

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mahjongg
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:25 pm

Iets not a safety issue, but the foundation found that the Ripple the POE HAT generates triggers one of the USB overcurrent protection chips used in PIs
So they want to Fix that before continueing the sales

rsdavis
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:29 pm

So for the Poe hats I did receive should they be returned due to issue?

Heater
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:32 pm

Dave Jones demonstrates and investigates the PoE Hat issues in this video https://www.youtube.com/watch?v=Tpvjo6wDFUA&t=1s

Sadly he managed to blow his PoE had up before completing his testing.

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mahjongg
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:36 pm

Only if your USB ports do.not work.with this POE device, otherwise you might decide to keep Them, its up to you.

B.Goode
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:41 pm

For background see https://www.theregister.co.uk/2018/09/1 ... hat_issue/

And for the full text of the letter from Eben Upton of RPF see this forum post - https://www.raspberrypi.org/forums/view ... 5#p1364312

Towards the end of that quoted letter it says:
- Users who have bought a HAT and are inconvenienced by this issue should return it for a refund.

rsdavis
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 4:56 pm

I will be returning these. Too many quality issues. Purchasing the costlier NavoLabs POE hat. See link below. This POE hat is extremely low profile and does not block all of the GPIO pins. Fanless as well. The Pi Foundation POE Hat needs a redesign for following reasons besides USB Issue:
- Fans will fail and I don’t see need for one when heatsinks alone should do the trick.
- Blocks all GPIO pins and therefore hat stacking

https://www.amazon.com/NavoLabs-Raspber ... ds=Poe+hat

hippy
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 6:04 pm

rsdavis wrote:
Sun Sep 16, 2018 4:29 pm
So for the Poe hats I did receive should they be returned due to issue?
That is up to you. My view is here -

https://www.raspberrypi.org/forums/view ... 5#p1365718

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rpdom
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 6:18 pm

rsdavis wrote:
Sun Sep 16, 2018 4:56 pm
- Blocks all GPIO pins and therefore hat stacking
You can use a header with long pins to allow stacking a HAT on top of the PoE HAT (this is the only HAT that allows stacking at the moment). It does mean using longer spacers to mount the PoE HAT on the Pi. It would be nice if the header and spacers came as standard or as an option.

jamesh
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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 9:40 pm

Heater wrote:
Sun Sep 16, 2018 4:32 pm
Dave Jones demonstrates and investigates the PoE Hat issues in this video https://www.youtube.com/watch?v=Tpvjo6wDFUA&t=1s

Sadly he managed to blow his PoE had up before completing his testing.
There are a number of issues with those tests, scope leads all over the place for example, but the basics are there, just don't rely on the conclusion numbers to be entirely accurate.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Please direct all questions to the forum, I do not do support via PM.

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Re: POE Hat Quarantine (Orders Blocked due to Hardware Issue)

Sun Sep 16, 2018 9:42 pm

rsdavis wrote:
Sun Sep 16, 2018 4:56 pm
I will be returning these. Too many quality issues. Purchasing the costlier NavoLabs POE hat. See link below. This POE hat is extremely low profile and does not block all of the GPIO pins. Fanless as well. The Pi Foundation POE Hat needs a redesign for following reasons besides USB Issue:
- Fans will fail and I don’t see need for one when heatsinks alone should do the trick.
- Blocks all GPIO pins and therefore hat stacking

https://www.amazon.com/NavoLabs-Raspber ... ds=Poe+hat
You can turn the fan off, it's not necessary for functionality, but will help in some poe applications where heatsinks won't do the trick.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Please direct all questions to the forum, I do not do support via PM.

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