WHAT NOT TO DO

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sirhc
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WHAT NOT TO DO

Mon Oct 26, 2015 6:40 pm

So you might ask what happens if you select 24VH as the POE option to a Legacy 10/100 POE device like the Ubiquiti NanoStation/Rocket/NanoBridge

Well, you will fry the device and damage the port the device is plugged into.

Basically you take out the Ethernet transformer and possibly some of the ESD protection circuit. It is a tell all sign this was done because if you remove all cables from the port and do a Cable Diagnostics you get the results seen below every time.

NEVER select 24VH to power Legacy 24V 10/100 devices.

With the WS-6-MINI 24VH and 48VH is the only POE option for Port 2 so Port 2 can NEVER power a legacy 10/100 UBiquiti device.

This type of damage is NOT covered under warranty and there will be a charge to repair it.

Note: A dead shorted cable will result in similar damage as seen below.

CLICK IMAGE BELOW TO VIEW FULL SIZE
NOT VH.jpg
NOT VH.jpg (109.44 KiB) Viewed 6523 times
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Re: WHAT NOT TO DO

Mon Nov 09, 2015 1:19 pm

Guess you learned the hard way?

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lligetfa
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Re: WHAT NOT TO DO

Mon Nov 09, 2015 6:48 pm

The school of hard knocks has a mean teacher. She gives the exam before the lesson!

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jjonsson
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Re: WHAT NOT TO DO

Tue Nov 10, 2015 3:55 pm

I was wondering why the port couldn't do 24V and 24VH as on the WS-8/12-250-AC...

Fortunately I did not fry anything. I did try though..... My PowerBeam AC just reset to factory default every time....

Hopefully there's no problem powering EdgeRouter X ? (I'm doing it right now with 4 switches different sites)

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sirhc
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Re: WHAT NOT TO DO

Tue Nov 10, 2015 3:57 pm

jjonsson wrote:I was wondering why the port couldn't do 24V and 24VH as on the WS-8/12-250-AC...

Fortunately I did not fry anything.


Came down to size of board and cost.

New v1.3.7 firmware has a safety check if you have POE Smart enabled.
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lionlike
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Re: WHAT NOT TO DO

Sun Nov 22, 2015 9:32 am

Hi sirhc,

I was just looking at the power brick on the nanobeam vs. the Rocket M5 from Ubiquiti. The nanobeam uses a 24V .5A poe brick, and the rocket m5 10/100 uses a 24V 1A poe brick. So based on what you're saying though, I should just use the 24V .75A poe setting on the switch, and DO NOT attempt to use 24VH on the rocket m5's, correct?

Thanks,
lionlike

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sirhc
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Re: WHAT NOT TO DO

Sun Nov 22, 2015 12:03 pm

lionlike wrote:I was just looking at the power brick on the nanobeam vs. the Rocket M5 from Ubiquiti. The nanobeam uses a 24V .5A poe brick, and the rocket m5 10/100 uses a 24V 1A poe brick. So based on what you're saying though, I should just use the 24V .75A poe setting on the switch, and DO NOT attempt to use 24VH on the rocket m5's, correct?


That is correct
sirhc wrote:NEVER select 24VH to power Legacy 24V 10/100 devices.

With the WS-6-MINI 24VH and 48VH is the only POE option for Port 2 so Port 2 can NEVER power a legacy 10/100 Ubiquiti device.


With the newest version of firmware v1.3.8 we took out a LOT of cable checks for POE Smart and only now look for "cross-shorts" which WILL fry a port and reply more on a drop down warning when selecting 24VH and 48VH.

This way people should now leave POE Smart ENABLED on all ports. IF IT IS NOT ENABLED I WOULD ENABLE IT IF USING v1.3.8 OR NEWER.
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Re: WHAT NOT TO DO

Sat Jan 02, 2016 3:55 pm

@lionlike, it's not the amps that does it, 24VH is on all the wires, 24V is only on the blue and brown pairs. you could do 24V 10A to a RocketM, doesn't matter, 'V' is the pressure, 'A' is how much is available. Putting 24V down the orange and green hits a circuit designed for ~3.3v. even 24V .5A is 12W to be dissipated by a tiny piece of silicon and copper in the ethernet chip. thus the damage by overheating and catastrophic burn.

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Re: WHAT NOT TO DO

Mon Feb 29, 2016 2:27 pm

Je me demande bien quel type d'appareil est utilisé en VH .......... :idea:

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Re: WHAT NOT TO DO

Mon Feb 29, 2016 2:54 pm

Read these posts:
viewtopic.php?f=6&t=1178
viewtopic.php?f=6&t=1215

But basically:
48VH is used to power AF24 and AF5 and WS-6-MINI
24VH is ONLY used to power AF2X, AF3X, AF5X but they now also support 48VH (read this post) viewtopic.php?f=6&t=1215#p9040

Pretty much everything you want to know can be found on this forums "if" you look for it
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