Netonix Forums

Hi Netonix Support,
We are experiencing a recurring issue across multiple sites where our Netonix switches enter a boot loop when powering Cambium ePMP 3000L (3KL) radios on 48V passive PoE ports.
Here are the key points:
The issue occurs only when powering the ePMP 3KL radios.
The Netonix switches reboot continuously as soon as the PoE port powering the ePMP 3KL is enabled.
We've attempted to downgrade the firmware on the affected switches to rule out a software issue, but this has not resolved the problem.
Other devices, including Ubiquiti sectors and radios, are powering up fine on the same ports and voltage settings, which suggests the problem is isolated to powering the ePMP 3KL units.
We are using 24V passive PoE, matching the requirements of the ePMP 3KL.
Could you please advise if this is a known compatibility issue or if there are specific PoE settings or firmware versions you recommend for stable operation with Cambium radios?
We can provide serial numbers, logs, and further site details if needed.

The ePMP 3000 series, including the 3000L, is polarity agnostic and can be powered with either standard PoE (4, 5, 7, 8) or alternative PoE (1, 2, 3, 6). The 3000L, in particular, requires 24V PoE and will not work with 48V. The ePMP 3000 AP (not the 3000L) uses 48V PoE.
Here's a more detailed breakdown:
ePMP 3000L:
Voltage: 24V.
Polarity: Agnostic (works with both standard and alternative PoE configurations).
Standard Pinout: + on 4/5, - on 7/8.
Important: Do not attempt to power with 48V.
ePMP 3000 AP:
Voltage: 48V.
Polarity: Standard pinout is expected.
Important Considerations:
Checking PoE Pinout: When connecting an ePMP 3000L, verify the PoE pinout of your switch and ensure it matches the 3000L's requirements.
Voltage Limits: The 3000L should not be powered by voltages higher than 30V.
Crossover Cables: If necessary, use a 5-pin to 7-pin cross-over cable adapter for compatibility with certain power supplies.



So unlike the emp 3000 which you can not power the 4500 you "should".

Firmware has nothing to do with it, use v1.5.25

Your details are lacking to say the least.

Model netonix switch.
Verify cable is crimped correctly.
Can you achieve a 1g connection on the cable or have you used a tester.

If DC switch you could be having inadequate power issues.

If AC switch and your below power supply rating you could have bad/damaged power supply or switch.

Have you benched tested this configuration before throwing out into production?

Could be bad radio?

The list goes on.

I would bench test same model switch with radio first make sure no issues.

Test cable.

If DC switch make sure you have enough power.

You could try turning everything else off then power up 4500.

Tons of things to diagnose. Since I'm not on site I'm just explaining things "I" would do to diagnose the problem.

Test that port with a jumper and a UBNT RADIO. Make sure you can turn on and off in UI.

Verify 1G link to laptop.

But firmware is NOT the issue, something else is wrong. Do some testing.

Test that port with