Emerging Member
Posts: 57
Registered: ‎09-11-2008
Accepted Solution

Correct POE for Bullet M5?

I have recently procured a pair of Bullet M5 units  One is apparently new in the box and the other was configured but may not have actually been installed.  To go with the Bullets I purchased three new POE-24-30W.  To my dismay I have discovered that the POE refuses to power the Bullet as the POE LED flashes for an instant quickly as does the power LED on the Bullet.  When I unplug the Bullet the POE LED turns on steady.

 

I have an extra 15v POE that is compatible with the NanoStation 5 Loco and Bullet 5 units I've had for years and it powers the Bullet M5 just fine as near as I can tell.

 

Which of the presently available POE units is compatible with the Bullet M5 or even the older NS 5 Loco/Bullet 5 units that I have?

 

Amateur radio station N0NB.

Accepted Solutions
Ubiquiti Employee
Posts: 11,856
Registered: ‎11-27-2012
Kudos: 3798
Solutions: 779
Contributions: 73

Re: Correct POE for Bullet M5?

[ Edited ]

The Bullet (and most airMAX M) can accept ~12-24VDC input voltage.  The POE-24-30W is a 4 pair POE and isn't compatible with airMAX M or AC devices.

 

Any UBNT POE running 15-24VDC on 2 pair will work.  I would suggest the POE-24-12W.

UBNT_Alternate_Logo.png
Ubiquiti Networks airMAX Support Team

Check out our ever-evolving Help Center for answers to many common questions!

FREE UBWA Student Guide-Great RF Primer!

View solution in original post


All Replies
Ubiquiti Employee
Posts: 11,856
Registered: ‎11-27-2012
Kudos: 3798
Solutions: 779
Contributions: 73

Re: Correct POE for Bullet M5?

[ Edited ]

The Bullet (and most airMAX M) can accept ~12-24VDC input voltage.  The POE-24-30W is a 4 pair POE and isn't compatible with airMAX M or AC devices.

 

Any UBNT POE running 15-24VDC on 2 pair will work.  I would suggest the POE-24-12W.

UBNT_Alternate_Logo.png
Ubiquiti Networks airMAX Support Team

Check out our ever-evolving Help Center for answers to many common questions!

FREE UBWA Student Guide-Great RF Primer!

Emerging Member
Posts: 57
Registered: ‎09-11-2008

Re: Correct POE for Bullet M5?

Thanks, James.

 

I now understand the difference and found the spec of 2-pair vs. 4 pair power between the devices.  I suppose I should ask next time when unsure.

 

Amateur radio station N0NB.
Ubiquiti Employee
Posts: 11,856
Registered: ‎11-27-2012
Kudos: 3798
Solutions: 779
Contributions: 73

Re: Correct POE for Bullet M5?

No Worries @Nate.  We'll discuss how to make POE choice a bit more clear.

UBNT_Alternate_Logo.png
Ubiquiti Networks airMAX Support Team

Check out our ever-evolving Help Center for answers to many common questions!

FREE UBWA Student Guide-Great RF Primer!

SuperUser
Posts: 6,182
Registered: ‎08-26-2009
Kudos: 1871
Solutions: 60

Re: Correct POE for Bullet M5?

While you are thinking about that...the white 4-pair POE that looks very close to the white 2-pair POE is a tad indistinguishable without looking for the lightning bolt mark

Ubiquiti Employee
Posts: 11,657
Registered: ‎04-14-2017
Kudos: 2169
Solutions: 335

Re: Correct POE for Bullet M5?

Thanks for the feedback.
SuperUser
Posts: 42,328
Registered: ‎06-23-2009
Kudos: 8644
Solutions: 1449

Re: Correct POE for Bullet M5?

[ Edited ]

James, a nice clear document with <gasp> a selection chart

would help to make this perennial popular topic more clear.

 

"POE-24-30W is a 4 wire POE and isn't compatible with airMAX M ... devices."

 

Why isn't a 4-wire PoE compatible with M-series radios?   Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com
SuperUser
Posts: 6,182
Registered: ‎08-26-2009
Kudos: 1871
Solutions: 60

Re: Correct POE for Bullet M5?

He means 4 pair power (+4 pair data). I made the same mistake and then corrected it before I hit post Man Happy

SuperUser
Posts: 42,328
Registered: ‎06-23-2009
Kudos: 8644
Solutions: 1449

Re: Correct POE for Bullet M5?

[ Edited ]

Got it!: POE-24-30W is a 4-pair [8-wire] PoE device

with Gb port, intended for use with high-power radios.

 

I'm sure this device will be in the proper column of that

new selection/comparison document.   Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com
Ubiquiti Employee
Posts: 11,856
Registered: ‎11-27-2012
Kudos: 3798
Solutions: 779
Contributions: 73

Re: Correct POE for Bullet M5?

[ Edited ]

@Dave-D wrote:

Got it!: POE-24-30W is a 4-pair [8-wire] PoE device

with Gb port, intended for use with high-power radios.

 

I'm sure this device will be in the proper column of that

new selection/comparison document.   Dave


I'm not sure having a table is the best solution.  What about just having the suggested model on the datasheet?  Or perhaps a document explaining how to select the correct POE? 

 

Edit:  Seeing how a table works.

UBNT_Alternate_Logo.png
Ubiquiti Networks airMAX Support Team

Check out our ever-evolving Help Center for answers to many common questions!

FREE UBWA Student Guide-Great RF Primer!

SuperUser
Posts: 42,328
Registered: ‎06-23-2009
Kudos: 8644
Solutions: 1449

Re: Correct POE for Bullet M5?

[ Edited ]

If it were only that simple.

 

A particular format isn't as important as the almost

complete lack of any documentation.

 

One PoE supply can fit multiple devices, and of course

there are sometimes multiple use scenarios for certain

devices--such as those with one or more secondary jacks.

Then there are devices that have been shipped with

different PoE supplies over the years.

 

Some producs that use external power supplies of any

kind should be included. For example, ER-X can be

powered by an external 12- or 24-Volt power supply--

as well as a PoE supply. In this case, the minimum

PoE supply can vary depending on the PoE load.

 

I recall another factor: the reset button: some PoE

supplies have them, and some radios can use them.

 

This sort of question has appeared hundreds of times

on the forums, because there's no documentation.   Dave

 

 


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com
SuperUser
Posts: 6,182
Registered: ‎08-26-2009
Kudos: 1871
Solutions: 60

Re: Correct POE for Bullet M5?

It's sad, but true. 

 

Also any large user of UniFi, or airMAX gear would have a collection of various power supplies and if there was a simple sheet that shows what can be used with which equipment, that would be nice.

Ubiquiti Employee
Posts: 11,856
Registered: ‎11-27-2012
Kudos: 3798
Solutions: 779
Contributions: 73

Re: Correct POE for Bullet M5?

We're working on this are trying to format in a useful way. 

 

UBNT_Alternate_Logo.png
Ubiquiti Networks airMAX Support Team

Check out our ever-evolving Help Center for answers to many common questions!

FREE UBWA Student Guide-Great RF Primer!

SuperUser
Posts: 14,588
Registered: ‎12-08-2008
Kudos: 11385
Solutions: 698
Contributions: 1

Re: Correct POE for Bullet M5?


@UBNT-James wrote:

We're working on this are trying to format in a useful way. 

 


Let's see - how many years ago did I suggest that some kind of color-code on the PoE injectors would be a good idea?   When did the first AF5 come out? ;-)

 

This continues to be a big problem for many users, both high volume pros and those who just buy one or two devices.   I religously mark every non-2-pair-24-volt injector with colored tape - green for the gigabit units; red or orange for the 48/50V units; yellow for the 24V 4 pair ones.   Marking the front of the white ones as 24 or 48 was a start, but something more needs to be done here.   It really shouldn't be a big deal to solve this years-long issue...

Jim

" How can anyone trust Scientists? If new evidence comes along, they change their minds! " Politician's joke (sort of...)
"Humans are allergic to change..They love to say, ‘We’ve always done it this way.’ I try to fight that. "Admiral Grace Hopper, USN, Computer Scientist
"It's not Rocket Science! - Oh wait, Actually it is... "NASA bumper sticker
"Just because you can do something doesn't mean you should."my mantra in the Programming classes I used to teach once upon a time...
SuperUser
Posts: 6,182
Registered: ‎08-26-2009
Kudos: 1871
Solutions: 60

Re: Correct POE for Bullet M5?

So many similar looking power supplies, so many different formats, gigabit, non-gigabit, 24v, 48v, 50v, 2-pair power, 4-pair power, 1A power at 24v, .5A power at 24v, and probably more that I am not aware of...The first challenge is simply identifying which device you have and what it is capable of...The second challenge is knowing which devices it is compatible with...

Emerging Member
Posts: 57
Registered: ‎09-11-2008

Re: Correct POE for Bullet M5?

[ Edited ]

To be fair, I have not really kept up with the various Ubiquiti offerings over the years.  I was previously unaware that 4 pair PoE devices were being used as my needs for a link between our farms are met by the 802.11* devices.

 

What brought this on for me was an apparent cabling issue that was causing my NS5L AP to go into constant reset mode (actually not known by me until later).  In an effort to get the hardware closer to ground level so I wouldn't have to climb 50' all the time, I opted to deploy a Bullet5 I'd had on hand at the base of my tower so I could deal with the electronics at ground level.  I found some Bullet M5 units for sparing and to replace the NS5L at the other place if need be, and then ran into my assumption about the PoEs.

 

The good news is that the seller has agreed to let me return them for a refund if they don't have the replacement model James recommended.

 

Amateur radio station N0NB.
Highlighted
SuperUser
Posts: 42,328
Registered: ‎06-23-2009
Kudos: 8644
Solutions: 1449

Re: Correct POE for Bullet M5?

[ Edited ]

Yep: there's a third challenge: what to do with the

$450 AirMax radio I blew up by using what I

was sure was the right PoE supply.

 

And yes: it would be very nice if I didn't have to

pull out a magnifying glass to read the specs. No--

I'm not 20 any more....    Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com