AF-5XHD (AF5XHD) recommended POE power output.

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JustJoe
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AF-5XHD (AF5XHD) recommended POE power output.

Thu Feb 01, 2018 2:53 pm

Oh joy ... Just got a brand new AF-5XHD.

In the Specifications booklet, p.42

Power Supply: 24V, 1A POE Gigabit Adapter (included)
Power Method: Passive Power over Ethernet
Supported Voltage Range: +19 to +50VDC
Max Power Consumption: 12W

The POE label:

Model: GP-H240-100G-4
PN: POE-24V-5X-HD
Output: 24V 1A
L.P.S. +(1,2)(4,5) pins -(3,6)(7,8) pins

So that would be power over 4 pair GigE

First, the 12W max power is nice. :)

24VH would work, but not all WISP switches provide that.
In my opinion, a +50VDC max in this day and age of 802.3at which can be 52V (?), and alternately, solar power voltage constraints, is kinda short-sighted, especially when there are really good, efficient 60V switching regulators for the same money and PC board space. :ak:

I would like to use a 48V setting, but on a WS-8-250-AC, that shows a board voltage of 50.5V. (Yes, long cables would be fine, but these tend to end up at tower sites where cables end up being short.)

First a specific question: The WS-12-250-AC shows a board power of 49.5V, would we be safe to say that the newer -AC models will stay below 50V ??? Would that also be true on the -DC models that have the 9-60VDC input ?

The more general question: If they didn't think through the regulator selection, could they have used a low power rated Ethernet transformer, such that providing 2 pair 24V could put the entire 12W through 2 transformers that might not be able to handle it? I know it's not a lot of power, and the Netonix switches use very beefy transformers. But these radios are being made on the line in China. ;)

I am going to be trying a test on a pair of these for a 27 mile 20MHz backup link to a friendly neighbor WISP. Just as an aside, they used Transition Networks industrial grade switches with 2 external DC supplies. They adjusted them for 52V to POE support their licensed link equipment. Up until now, they used MikroTik inline to go 52 -> 24V, but those did not support GigE. So the same disappointment with the 50V spec limit.

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Thu Feb 01, 2018 3:14 pm

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Thu Feb 01, 2018 3:33 pm

Chris, maybe I am missing something?

None of the info you provided refers to the new AF-5XHD

That is a completely different animal than AF-5X

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Thu Feb 01, 2018 3:40 pm

Maybe this would help...

https://community.ubnt.com/t5/airFiber/ ... 422#M40640

53V is NOT the same as 50V

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Thu Feb 01, 2018 4:31 pm

JustJoe wrote:
In the Specifications booklet, p.42

Power Supply: 24V, 1A POE Gigabit Adapter (included)
Power Method: Passive Power over Ethernet
Supported Voltage Range: +19 to +50VDC
Max Power Consumption: 12W

The POE label:

Model: GP-H240-100G-4
PN: POE-24V-5X-HD
Output: 24V 1A
L.P.S. +(1,2)(4,5) pins -(3,6)(7,8) pins


So for pin polarity our 48VH matches up:
viewtopic.php?f=6&t=1178#p8809
48VH POE Option @1.5A - constant draw can surge/spike to 2A:
802.3af/at MODE A & MODE B [i]pinout combined[/i]
Pair 1 & 3 / PINs 1, 2, 4, 5 are POSITIVE
Pair 2 & 4 / PINs 3, 6, 7, 8 are NEGATIVE


Now keep in mind that our 48VH is really 50V but it is still within the acceptable range:
Supported Voltage Range: +19 to +50VDC


Also keep in mind we put in 50V but the longer the wire there will be voltage drop till it reaches the AF5XHD

So I would use 48VH
You could also use our 24VH if you have a port available that supports it.

My guess at 15 watts you could also get away with with 24V on SHORT cable runs and 48V on mid length cable runs but use 24VH or 48VH on longer runs.

*********************************

Question: Can I power this device with Netonix.

Answer:
Our switches are "passive" POE which means if POE is enabled on a port the power is live so if you plug in a cable that is shorted or the piece of equipment is bad or has an incompatible polarity PIN OUT you will damage the port in the switch and probably the equipment, this damage is not covered under warranty.

There are 4 Pairs and 8 PINs in an Ethernet Cable:
Pair 1: White Orange.(PIN 1 ) & Orange.(PIN 2) is POSITIVE
Pair 2: White Green...(PIN 3) & Green...(PIN 6) is NEGATIVE
Pair 3: White Blue.....(PIN 4) & Blue.....(PIN 5) is POSITIVE
Pair 4: White Brown..(PIN 7) & Brown...(PIN 8) is NEGATIVE

24V POE Option @ .75A - constant draw can surge/spike to 1A:
802.3af/at MODE B [i]pinout[/i]
Pair 3 / PINs 4, 5 are POSITIVE
Pair 2 & 4 / PINs 3, 6, 7, 8 are NEGATIVE

48V POE Option @.75A - constant draw can surge/spike to 1A:
802.3af/at MODE B [i]pinout[/i]
You would use this option to power most 802.3af/at devices like IP Phones and Cameras
Pair 3 / PINs 4, 5 are POSITIVE
Pair 2 & 4 / PINs 3, 6, 7, 8 are NEGATIVE

24VH POE Option @1.5A - constant draw can surge/spike to 2A:
802.3af/at MODE A & MODE B [i]pinout combined[/i]
Pair 1 & 3 / PINs 1, 2, 4, 5 are POSITIVE
Pair 2 & 4 / PINs 3, 6, 7, 8 are NEGATIVE

48VH POE Option @1.5A - constant draw can surge/spike to 2A:
802.3af/at MODE A & MODE B [i]pinout combined[/i]
Pair 1 & 3 / PINs 1, 2, 4, 5 are POSITIVE
Pair 2 & 4 / PINs 3, 6, 7, 8 are NEGATIVE

So now that you know what the PIN OUT is (which is in our Spec Sheet on page 17 and in the product description on our web store) all you need to do is look at the spec sheet from your device and see which POE option you can use.

If they do not specify the PIN OUT polarity break out a multi-meter and but one end off of a patch cable and strip the wires and figure it out on your own.

Also if they have a bridge rectifier circuit like MIMOSA the device will swap the polarity the way it wants it.

WARNING - If your equipment is not specifically designed to accept power on all 4 Pairs do NOT use a VH POE option.

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Fri Feb 02, 2018 3:01 pm

Thanks Chris. The AF-5XHD is moderately pricey, so just wanted to make sure you were aware of it being different and what you recommended.

If I am correct, it is based on a completely new chipset that does not include Atheros/qualcom. As goes apple, so goes ubnt, probably for the same reason. Hell, with the new chips, ubnt will probably try to replace qualcom's chips in apple.

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Re: AF-5XHD (AF5XHD) recommended POE power output.

Fri Feb 02, 2018 4:31 pm

JustJoe wrote:Thanks Chris. The AF-5XHD is moderately pricey, so just wanted to make sure you were aware of it being different and what you recommended.

If I am correct, it is based on a completely new chipset that does not include Atheros/qualcom. As goes apple, so goes ubnt, probably for the same reason. Hell, with the new chips, ubnt will probably try to replace qualcom's chips in apple.


All airFIBER radios use an FPGA chip, never used Atheros in any AF or AFX radio.

The chip has nothing to do with the input voltages as there is nothing in any UBNT radio that uses 24V or 48V. They simply step it down inside the board to the voltages needed to run the board such as 1V and 5V.

They do not feed it 5V because the amperage would be much higher.

Examples:
Radio needs say 20 watts
20 watts / 48 volts = 0.41666 amps

Radio needs say 20 watts
20 watts / 24 volts = 0.83333 amps

20 watts / 5 volts = 4.0 amps <= way to many amps for Ethernet Cable.

Watts are watts but Amperage changes or goes up as voltage goes down.

Not to mention if the radio needs 5V and you fed 5V into a 300' Ethernet cable trying to push 4 AMPS the voltage on the other side would be way too low and the wire would heat up and catch fire.
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